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Date:   Fri, 20 Nov 2020 16:38:19 +0200
From:   Laurentiu Palcu <laurentiu.palcu@....nxp.com>
To:     Liu Ying <victor.liu@....com>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "maarten.lankhorst@...ux.intel.com" 
        <maarten.lankhorst@...ux.intel.com>,
        "mripard@...nel.org" <mripard@...nel.org>,
        "tzimmermann@...e.de" <tzimmermann@...e.de>
Subject: Re: [PATCH 5/8] drm/imx: Introduce i.MX8qxp DPU DRM

Hi Liu Ying,

I gave this a first look but, since this is a huge piece of code and I'm not
very familiar with DPU, I'll probably give it another pass next week.

Anyway, some comments/questions inline.

On Thu, Nov 19, 2020 at 11:22:22AM +0200, Liu Ying wrote:
> This patch introduces i.MX8qxp Display Processing Unit(DPU) DRM support.
> 
> DPU is comprised of two main components that include a blit engine for
> 2D graphics accelerations(with composition support) and a display controller
> for display output processing, as well as a command sequencer.  Outside of
> DPU, optional prefetch engines, a.k.a, Prefetch Resolve Gasket(PRG) and
> Display Prefetch Resolve(DPR), can fetch data from memory prior to some DPU
> fetchunits of blit engine and display controller.  The prefetch engines
> support reading linear formats and resolving Vivante GPU tile formats.
> 
> This patch adds kernel modesetting support for the display controller part.
> The driver supports two CRTCs per display controller, planes backed by
> four fetchunits(decode0/1, fetchlayer, fetchwarp), fetchunit allocation
> logic for the two CRTCs, prefetch engines(with tile resolving supported),
> plane upscaling/deinterlacing/yuv2rgb CSC/alpha blending and CRTC gamma
> correction.  The registers of the controller is accessed without command
> sequencer involved, instead just by using CPU.

Will you also add support for command sequencer in the future? The command
sequencer seems to have the same purpose as the DCSS context loader on iMX8MQ,
which is very useful for configuring the various DC blocks right in the
blanking period without having to worry about synchronization. Why not use it
from the very beginning?

> 
> Reference manual can be found at:
> https://www.nxp.com/webapp/Download?colCode=IMX8DQXPRM
> 
> Signed-off-by: Liu Ying <victor.liu@....com>
> ---

[...]

> diff --git a/drivers/gpu/drm/imx/dpu/dpu-core.c b/drivers/gpu/drm/imx/dpu/dpu-core.c
> new file mode 100644
> index 00000000..1583c7a
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dpu/dpu-core.c
> @@ -0,0 +1,880 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/*
> + * Copyright (C) 2016 Freescale Semiconductor, Inc.
> + * Copyright 2017-2020 NXP
> + */
> +
> +#include <linux/dma-mapping.h>
> +#include <linux/io.h>
> +#include <linux/irq.h>
> +#include <linux/irqchip/chained_irq.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/of_graph.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_domain.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/sizes.h>
> +
> +#include "dpu.h"
> +#include "dpu-prv.h"
> +
> +static inline u32 dpu_comctrl_read(struct dpu_soc *dpu, unsigned int offset)
> +{
> +	return readl(dpu->comctrl_reg + offset);
> +}
> +
> +static inline void dpu_comctrl_write(struct dpu_soc *dpu,
> +				     unsigned int offset, u32 value)
> +{
> +	writel(value, dpu->comctrl_reg + offset);
> +}
> +
> +/* Constant Frame */
> +static const unsigned int cf_ids[] = {0, 1, 4, 5};
> +static const enum dpu_unit_type cf_types[] = {DPU_DISP, DPU_DISP,
> +					      DPU_DISP, DPU_DISP};
> +static const unsigned long cf_ofss[] = {0x4400, 0x5400, 0x4c00, 0x5c00};
> +static const unsigned long cf_pec_ofss[] = {0x960, 0x9e0, 0x9a0, 0xa20};
> +
> +/* Display Engine Configuration */
> +static const unsigned int dec_ids[] = {0, 1};
> +static const enum dpu_unit_type dec_types[] = {DPU_DISP, DPU_DISP};
> +static const unsigned long dec_ofss[] = {0xb400, 0xb420};
> +
> +/* External Destination */
> +static const unsigned int ed_ids[] = {0, 1, 4, 5};
> +static const enum dpu_unit_type ed_types[] = {DPU_DISP, DPU_DISP,
> +					      DPU_DISP, DPU_DISP};
> +static const unsigned long ed_ofss[] = {0x4800, 0x5800, 0x5000, 0x6000};
> +static const unsigned long ed_pec_ofss[] = {0x980, 0xa00, 0x9c0, 0xa40};
> +
> +/* Fetch Decode */
> +static const unsigned int fd_ids[] = {0, 1, 9};
> +static const enum dpu_unit_type fd_types[] = {DPU_DISP, DPU_DISP, DPU_BLIT};
> +static const unsigned long fd_ofss[] = {0x6c00, 0x7800, 0x1000};
> +static const unsigned long fd_pec_ofss[] = {0xa80, 0xaa0, 0x820};
> +
> +/* Fetch ECO */
> +static const unsigned int fe_ids[] = {0, 1, 2, 9};
> +static const enum dpu_unit_type fe_types[] = {DPU_DISP, DPU_DISP,
> +					      DPU_DISP, DPU_BLIT};
> +static const unsigned long fe_ofss[] = {0x7400, 0x8000, 0x6800, 0x1c00};
> +static const unsigned long fe_pec_ofss[] = {0xa90, 0xab0, 0xa70, 0x850};
> +
> +/* Frame Generator */
> +static const unsigned int fg_ids[] = {0, 1};
> +static const enum dpu_unit_type fg_types[] = {DPU_DISP, DPU_DISP};
> +static const unsigned long fg_ofss[] = {0xb800, 0xd400};
> +
> +/* Fetch Layer */
> +static const unsigned int fl_ids[] = {0};
> +static const enum dpu_unit_type fl_types[] = {DPU_DISP};
> +static const unsigned long fl_ofss[] = {0x8400};
> +static const unsigned long fl_pec_ofss[] = {0xac0};
> +
> +/* Fetch Warp */
> +static const unsigned int fw_ids[] = {2, 9};
> +static const enum dpu_unit_type fw_types[] = {DPU_DISP, DPU_BLIT};
> +static const unsigned long fw_ofss[] = {0x6400, 0x1800};
> +static const unsigned long fw_pec_ofss[] = {0xa60, 0x840};
> +
> +/* Gamma Correction */
> +static const unsigned int gc_ids[] = {0, 1};
> +static const enum dpu_unit_type gc_types[] = {DPU_DISP, DPU_DISP};
> +static const unsigned long gc_ofss[] = {0xc000, 0xdc00};
> +
> +/* Horizontal Scaler */
> +static const unsigned int hs_ids[] = {4, 5, 9};
> +static const enum dpu_unit_type hs_types[] = {DPU_DISP, DPU_DISP, DPU_BLIT};
> +static const unsigned long hs_ofss[] = {0x9000, 0x9c00, 0x3000};
> +static const unsigned long hs_pec_ofss[] = {0xb00, 0xb60, 0x8c0};
> +
> +/* Layer Blend */
> +static const unsigned int lb_ids[] = {0, 1, 2, 3};
> +static const enum dpu_unit_type lb_types[] = {DPU_DISP, DPU_DISP,
> +					      DPU_DISP, DPU_DISP};
> +static const unsigned long lb_ofss[] = {0xa400, 0xa800, 0xac00, 0xb000};
> +static const unsigned long lb_pec_ofss[] = {0xba0, 0xbc0, 0xbe0, 0xc00};
> +
> +/* Timing Controller */
> +static const unsigned int tcon_ids[] = {0, 1};
> +static const enum dpu_unit_type tcon_types[] = {DPU_DISP, DPU_DISP};
> +static const unsigned long tcon_ofss[] = {0xc800, 0xe400};
> +
> +/* Vertical Scaler */
> +static const unsigned int vs_ids[] = {4, 5, 9};
> +static const enum dpu_unit_type vs_types[] = {DPU_DISP, DPU_DISP, DPU_BLIT};
> +static const unsigned long vs_ofss[] = {0x9400, 0xa000, 0x3400};
> +static const unsigned long vs_pec_ofss[] = {0xb20, 0xb80, 0x8e0};
> +
> +#define DPU_UNITS_DEFINE(unit)			\
> +static const struct dpu_units dpu_##unit##s = {	\
> +	.ids = unit##_ids,			\
> +	.types = unit##_types,			\
> +	.ofss = unit##_ofss,			\
> +	.pec_ofss = unit##_pec_ofss,		\
> +	.cnt = ARRAY_SIZE(unit##_ids),		\
> +}
> +
> +/* units without Pixel Engine Configuration */
> +#define DPU_UNITS_DEFINE_NO_PEC(unit)		\
> +static const struct dpu_units dpu_##unit##s = {	\
> +	.ids = unit##_ids,			\
> +	.types = unit##_types,			\
> +	.ofss = unit##_ofss,			\
> +	.pec_ofss = NULL,			\
> +	.cnt = ARRAY_SIZE(unit##_ids),		\
> +}
> +
> +DPU_UNITS_DEFINE(cf);
> +DPU_UNITS_DEFINE_NO_PEC(dec);
> +DPU_UNITS_DEFINE(ed);
> +DPU_UNITS_DEFINE(fd);
> +DPU_UNITS_DEFINE(fe);
> +DPU_UNITS_DEFINE_NO_PEC(fg);
> +DPU_UNITS_DEFINE(fl);
> +DPU_UNITS_DEFINE(fw);
> +DPU_UNITS_DEFINE_NO_PEC(gc);
> +DPU_UNITS_DEFINE(hs);
> +DPU_UNITS_DEFINE(lb);
> +DPU_UNITS_DEFINE_NO_PEC(tcon);
> +DPU_UNITS_DEFINE(vs);
> +
> +static void dpu_detach_pm_domains(struct dpu_soc *dpu)
> +{
> +#define DPU_DETACH_PM_DOMAIN(name)					\
> +do {									\
> +	if (!IS_ERR_OR_NULL(dpu->pd_##name##_link))			\
> +		device_link_del(dpu->pd_##name##_link);			\
> +	if (!IS_ERR_OR_NULL(dpu->pd_##name##_dev))			\
> +		dev_pm_domain_detach(dpu->pd_##name##_dev, true);	\
> +									\
> +	dpu->pd_##name##_dev = NULL;					\
> +	dpu->pd_##name##_link = NULL;					\
> +} while (0)
> +
> +	DPU_DETACH_PM_DOMAIN(pll1);
> +	DPU_DETACH_PM_DOMAIN(pll0);
> +	DPU_DETACH_PM_DOMAIN(dc);
> +}
> +
> +static int dpu_attach_pm_domains(struct dpu_soc *dpu)
> +{
> +	u32 flags = DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE;
> +	int ret = 0;
> +
> +#define DPU_ATTACH_PM_DOMAIN(name)					\
> +do {									\
> +	dpu->pd_##name##_dev =						\
> +		dev_pm_domain_attach_by_name(dpu->dev, "" #name "");	\
> +	if (IS_ERR(dpu->pd_##name##_dev)) {				\
> +		ret = PTR_ERR(dpu->pd_##name##_dev);			\
> +		dev_err(dpu->dev,					\
> +			"failed to attach " #name " pd dev: %d\n", ret);\
> +		goto fail;						\
> +	}								\
> +									\
> +	dpu->pd_##name##_link =						\
> +		device_link_add(dpu->dev, dpu->pd_##name##_dev, flags);	\
> +	if (IS_ERR(dpu->pd_##name##_link)) {				\
> +		ret = PTR_ERR(dpu->pd_##name##_link);			\
> +		dev_err(dpu->dev,					\
> +			"failed to add device link to " #name		\
> +			" pd dev: %d\n", ret);				\
> +		goto fail;						\
> +	}								\
> +} while (0)
> +
> +	DPU_ATTACH_PM_DOMAIN(dc);
> +	DPU_ATTACH_PM_DOMAIN(pll0);
> +	DPU_ATTACH_PM_DOMAIN(pll1);
> +
> +	return ret;
> +fail:
> +	dpu_detach_pm_domains(dpu);
> +	return ret;
> +}
> +
> +static void dpu_units_addr_dbg(struct dpu_soc *dpu, unsigned long dpu_base)
> +{
> +	int i;
> +
> +	dev_dbg(dpu->dev, "Common Control: 0x%08lx\n", dpu_base);
> +
> +#define DPU_UNITS_ADDR_DBG(unit)					\
> +do {									\
> +	const struct dpu_units *us = &dpu_##unit##s;			\
> +									\
> +	for (i = 0; i < us->cnt; i++) {					\
> +		if (us->pec_ofss) {					\
> +			dev_dbg(dpu->dev, "%s%d: pixengcfg @ 0x%08lx,"	\
> +				" unit @ 0x%08lx\n", #unit,		\
> +				us->ids[i],				\
> +				dpu_base + us->pec_ofss[i],		\
> +				dpu_base + us->ofss[i]);		\
> +		} else {						\
> +			dev_dbg(dpu->dev,				\
> +				"%s%d: unit @ 0x%08lx\n", #unit,	\
> +				us->ids[i], dpu_base + us->ofss[i]);	\
> +		}							\
> +	}								\
> +} while (0)
> +
> +	DPU_UNITS_ADDR_DBG(cf);
> +	DPU_UNITS_ADDR_DBG(dec);
> +	DPU_UNITS_ADDR_DBG(ed);
> +	DPU_UNITS_ADDR_DBG(fd);
> +	DPU_UNITS_ADDR_DBG(fe);
> +	DPU_UNITS_ADDR_DBG(fg);
> +	DPU_UNITS_ADDR_DBG(fl);
> +	DPU_UNITS_ADDR_DBG(fw);
> +	DPU_UNITS_ADDR_DBG(gc);
> +	DPU_UNITS_ADDR_DBG(hs);
> +	DPU_UNITS_ADDR_DBG(lb);
> +	DPU_UNITS_ADDR_DBG(tcon);
> +	DPU_UNITS_ADDR_DBG(vs);
> +}
> +
> +static int dpu_get_irq(struct platform_device *pdev, struct dpu_soc *dpu)
> +{
> +#define DPU_GET_IRQ(name)						\
> +do {									\
> +	dpu->irq_##name = platform_get_irq_byname(pdev, "" #name "");	\
> +	dev_dbg(dpu->dev, "get irq_" #name ": %d\n", dpu->irq_##name);	\
> +	if (dpu->irq_##name < 0) {					\
> +		dev_err_probe(dpu->dev, dpu->irq_##name,		\
> +			     "failed to get irq " #name "\n");		\
> +		return dpu->irq_##name;					\
> +	}								\
> +} while (0)
> +
> +	DPU_GET_IRQ(disengcfg_framecomplete0);
> +	DPU_GET_IRQ(disengcfg_seqcomplete0);
> +	DPU_GET_IRQ(disengcfg_shdload0);
> +	DPU_GET_IRQ(disengcfg_framecomplete1);
> +	DPU_GET_IRQ(disengcfg_seqcomplete1);
> +	DPU_GET_IRQ(disengcfg_shdload1);
> +	DPU_GET_IRQ(extdst0_shdload);
> +	DPU_GET_IRQ(extdst1_shdload);
> +	DPU_GET_IRQ(extdst4_shdload);
> +	DPU_GET_IRQ(extdst5_shdload);
> +
> +	return 0;
> +}
> +
> +static void dpu_irq_handle(struct irq_desc *desc, enum dpu_irq irq)
> +{
> +	struct dpu_soc *dpu = irq_desc_get_handler_data(desc);
> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> +	unsigned int virq;
> +	u32 status;
> +
> +	chained_irq_enter(chip, desc);
> +
> +	status = dpu_comctrl_read(dpu, USERINTERRUPTSTATUS(irq / 32));
> +	status &= dpu_comctrl_read(dpu, USERINTERRUPTENABLE(irq / 32));
> +
> +	if (status & BIT(irq % 32)) {
> +		virq = irq_linear_revmap(dpu->domain, irq);
> +		if (virq)
> +			generic_handle_irq(virq);
> +	}
> +
> +	chained_irq_exit(chip, desc);
> +}
> +
> +#define DPU_IRQ_DISENGCFG_FRAMECOMPLETE_HANDLER_DEFINE(id)		\
> +static void								\
> +dpu_disengcfg_framecomplete##id##_irq_handler(struct irq_desc *desc)	\
> +{									\
> +	dpu_irq_handle(desc, DPU_IRQ_DISENGCFG_FRAMECOMPLETE##id);	\
> +}
> +
> +#define DPU_IRQ_DISENGCFG_SEQCOMPLETE_HANDLER_DEFINE(id)		\
> +static void								\
> +dpu_disengcfg_seqcomplete##id##_irq_handler(struct irq_desc *desc)	\
> +{									\
> +	dpu_irq_handle(desc, DPU_IRQ_DISENGCFG_SEQCOMPLETE##id);	\
> +}
> +
> +#define DPU_IRQ_DISENGCFG_SHDLOAD_HANDLER_DEFINE(id)		\
> +static void							\
> +dpu_disengcfg_shdload##id##_irq_handler(struct irq_desc *desc)	\
> +{								\
> +	dpu_irq_handle(desc, DPU_IRQ_DISENGCFG_SHDLOAD##id);	\
> +}
> +
> +#define DPU_IRQ_EXTDST_SHDLOAD_HANDLER_DEFINE(id)		\
> +static void							\
> +dpu_extdst##id##_shdload_irq_handler(struct irq_desc *desc)	\
> +{								\
> +	dpu_irq_handle(desc, DPU_IRQ_EXTDST##id##_SHDLOAD);	\
> +}
> +
> +DPU_IRQ_DISENGCFG_FRAMECOMPLETE_HANDLER_DEFINE(0)
> +DPU_IRQ_DISENGCFG_FRAMECOMPLETE_HANDLER_DEFINE(1)
> +
> +DPU_IRQ_DISENGCFG_SEQCOMPLETE_HANDLER_DEFINE(0)
> +DPU_IRQ_DISENGCFG_SEQCOMPLETE_HANDLER_DEFINE(1)
> +
> +DPU_IRQ_DISENGCFG_SHDLOAD_HANDLER_DEFINE(0)
> +DPU_IRQ_DISENGCFG_SHDLOAD_HANDLER_DEFINE(1)
> +
> +DPU_IRQ_EXTDST_SHDLOAD_HANDLER_DEFINE(0)
> +DPU_IRQ_EXTDST_SHDLOAD_HANDLER_DEFINE(1)
> +DPU_IRQ_EXTDST_SHDLOAD_HANDLER_DEFINE(4)
> +DPU_IRQ_EXTDST_SHDLOAD_HANDLER_DEFINE(5)
> +
> +int dpu_map_irq(struct dpu_soc *dpu, int irq)
> +{
> +	int virq = irq_linear_revmap(dpu->domain, irq);
> +
> +	if (!virq)
> +		virq = irq_create_mapping(dpu->domain, irq);
> +
> +	return virq;
> +}
> +
> +static const unsigned long unused_irq[2] = {0x00000000, 0xfffe0008};
> +
> +static void dpu_irq_hw_init(struct dpu_soc *dpu)
> +{
> +	int i;
> +
> +	for (i = 0; i < DPU_IRQ_COUNT; i += 32) {
> +		/* mask and clear all interrupts */
> +		dpu_comctrl_write(dpu, USERINTERRUPTENABLE(i / 32), 0);
> +		dpu_comctrl_write(dpu, USERINTERRUPTCLEAR(i / 32),
> +					~unused_irq[i / 32]);
> +		dpu_comctrl_write(dpu, INTERRUPTENABLE(i / 32), 0);
> +		dpu_comctrl_write(dpu, INTERRUPTCLEAR(i / 32),
> +					~unused_irq[i / 32]);
> +
> +		/* set all interrupts to user mode */
> +		dpu_comctrl_write(dpu, USERINTERRUPTMASK(i / 32),
> +					~unused_irq[i / 32]);
> +	}
> +}
> +
> +static int dpu_irq_init(struct dpu_soc *dpu)
> +{
> +	struct device *dev = dpu->dev;
> +	struct irq_chip_generic *gc;
> +	struct irq_chip_type *ct;
> +	int ret, i;
> +
> +	dpu->domain = irq_domain_add_linear(dev->of_node, DPU_IRQ_COUNT,
> +					    &irq_generic_chip_ops, dpu);
> +	if (!dpu->domain) {
> +		dev_err(dev, "failed to add irq domain\n");
> +		return -ENODEV;
> +	}
> +
> +	ret = irq_alloc_domain_generic_chips(dpu->domain, 32, 1, "DPU",
> +					     handle_level_irq, 0, 0, 0);
> +	if (ret) {
> +		dev_err(dev, "failed to alloc generic irq chips: %d\n", ret);
> +		irq_domain_remove(dpu->domain);
> +		return ret;
> +	}
> +
> +	for (i = 0; i < DPU_IRQ_COUNT; i += 32) {
> +		gc = irq_get_domain_generic_chip(dpu->domain, i);
> +		gc->reg_base = dpu->comctrl_reg;
> +		gc->unused = unused_irq[i / 32];
> +		ct = gc->chip_types;
> +		ct->chip.irq_ack = irq_gc_ack_set_bit;
> +		ct->chip.irq_mask = irq_gc_mask_clr_bit;
> +		ct->chip.irq_unmask = irq_gc_mask_set_bit;
> +		ct->regs.ack = USERINTERRUPTCLEAR(i / 32);
> +		ct->regs.mask = USERINTERRUPTENABLE(i / 32);
> +	}
> +
> +#define DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA1(name)	\
> +irq_set_chained_handler_and_data(dpu->irq_##name, dpu_##name##_irq_handler, dpu)
> +
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA1(disengcfg_framecomplete0);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA1(disengcfg_seqcomplete0);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA1(disengcfg_shdload0);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA1(disengcfg_framecomplete1);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA1(disengcfg_seqcomplete1);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA1(disengcfg_shdload1);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA1(extdst0_shdload);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA1(extdst1_shdload);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA1(extdst4_shdload);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA1(extdst5_shdload);
> +
> +	return ret;
> +}
> +
> +static void dpu_irq_exit(struct dpu_soc *dpu)
> +{
> +	unsigned int i, irq;
> +
> +#define DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA2(name)	\
> +irq_set_chained_handler_and_data(dpu->irq_##name, NULL, NULL)
> +
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA2(disengcfg_framecomplete0);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA2(disengcfg_seqcomplete0);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA2(disengcfg_shdload0);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA2(disengcfg_framecomplete1);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA2(disengcfg_seqcomplete1);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA2(disengcfg_shdload1);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA2(extdst0_shdload);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA2(extdst1_shdload);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA2(extdst4_shdload);
> +	DPU_IRQ_SET_CHAINED_HANDLER_AND_DATA2(extdst5_shdload);
> +
> +	for (i = 0; i < DPU_IRQ_COUNT; i++) {
> +		irq = irq_linear_revmap(dpu->domain, i);
> +		if (irq)
> +			irq_dispose_mapping(irq);
> +	}
> +
> +	irq_domain_remove(dpu->domain);
> +}
> +
> +static void dpu_submodules_hw_init(struct dpu_soc *dpu)
> +{
> +#define DPU_UNITS_HW_INIT(unit)				\
> +do {							\
> +	const struct dpu_units *us = &dpu_##unit##s;	\
> +	int i;						\
> +							\
> +	for (i = 0; i < us->cnt; i++)			\
> +		dpu_##unit##_hw_init(dpu, i);		\
> +} while (0)
> +
> +	DPU_UNITS_HW_INIT(cf);
> +	DPU_UNITS_HW_INIT(dec);
> +	DPU_UNITS_HW_INIT(ed);
> +	DPU_UNITS_HW_INIT(fd);
> +	DPU_UNITS_HW_INIT(fe);
> +	DPU_UNITS_HW_INIT(fg);
> +	DPU_UNITS_HW_INIT(fl);
> +	DPU_UNITS_HW_INIT(fw);
> +	DPU_UNITS_HW_INIT(gc);
> +	DPU_UNITS_HW_INIT(hs);
> +	DPU_UNITS_HW_INIT(lb);
> +	DPU_UNITS_HW_INIT(tcon);
> +	DPU_UNITS_HW_INIT(vs);
> +}
> +
> +static int dpu_submodules_init(struct dpu_soc *dpu, unsigned long dpu_base)
> +{
> +	int ret, i;
> +
> +#define DPU_UNIT_INIT(unit, base, index, id, type, pec_ofs, ofs)	\
> +do {									\
> +	ret = dpu_##unit##_init(dpu, (index), (id), (type),		\
> +				(pec_ofs) ? (base) + (pec_ofs) : 0,	\
> +				(base) + (ofs));			\
> +	if (ret) {							\
> +		dev_err(dpu->dev, "failed to initialize %s%d: %d\n",	\
> +						#unit, (id), ret);	\
> +		return ret;						\
> +	}								\
> +} while (0)
> +
> +#define DPU_UNITS_INIT(unit)						\
> +do {									\
> +	const struct dpu_units *us = &dpu_##unit##s;			\
> +									\
> +	for (i = 0; i < us->cnt; i++)					\
> +		DPU_UNIT_INIT(unit, dpu_base, i,			\
> +			      us->ids[i], us->types[i],			\
> +			      us->pec_ofss ? us->pec_ofss[i] : 0,	\
> +			      us->ofss[i]);				\
> +} while (0)
> +
> +	DPU_UNITS_INIT(cf);
> +	DPU_UNITS_INIT(dec);
> +	DPU_UNITS_INIT(ed);
> +	DPU_UNITS_INIT(fd);
> +	DPU_UNITS_INIT(fe);
> +	DPU_UNITS_INIT(fg);
> +	DPU_UNITS_INIT(fl);
> +	DPU_UNITS_INIT(fw);
> +	DPU_UNITS_INIT(gc);
> +	DPU_UNITS_INIT(hs);
> +	DPU_UNITS_INIT(lb);
> +	DPU_UNITS_INIT(tcon);
> +	DPU_UNITS_INIT(vs);
> +
> +	return 0;
> +}
> +
> +static int platform_remove_devices_fn(struct device *dev, void *unused)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +
> +	platform_device_unregister(pdev);
> +
> +	return 0;
> +}
> +
> +static void platform_device_unregister_children(struct platform_device *pdev)
> +{
> +	device_for_each_child(&pdev->dev, NULL, platform_remove_devices_fn);
> +}
> +
> +struct dpu_platform_reg {
> +	struct dpu_client_platformdata pdata;
> +	const char *name;
> +};
> +
> +static struct dpu_platform_reg client_reg[] = {
> +	{
> +	  .pdata = {
> +		.stream_id = 0,
> +		.dec_frame_complete_irq	= DPU_IRQ_DISENGCFG_FRAMECOMPLETE0,
> +		.dec_seq_complete_irq	= DPU_IRQ_DISENGCFG_SEQCOMPLETE0,
> +		.dec_shdld_irq		= DPU_IRQ_DISENGCFG_SHDLOAD0,
> +		.ed_cont_shdld_irq	= DPU_IRQ_EXTDST0_SHDLOAD,
> +		.ed_safe_shdld_irq	= DPU_IRQ_EXTDST4_SHDLOAD,
> +	   },
> +	  .name = "imx-dpu-crtc",
> +	}, {
> +	  .pdata = {
> +		.stream_id = 1,
> +		.dec_frame_complete_irq	= DPU_IRQ_DISENGCFG_FRAMECOMPLETE1,
> +		.dec_seq_complete_irq	= DPU_IRQ_DISENGCFG_SEQCOMPLETE1,
> +		.dec_shdld_irq		= DPU_IRQ_DISENGCFG_SHDLOAD1,
> +		.ed_cont_shdld_irq	= DPU_IRQ_EXTDST1_SHDLOAD,
> +		.ed_safe_shdld_irq	= DPU_IRQ_EXTDST5_SHDLOAD,
> +	  },
> +	  .name = "imx-dpu-crtc",
> +	}
> +};
> +
> +static DEFINE_MUTEX(dpu_client_id_mutex);
> +static int dpu_client_id;
> +
> +static int dpu_get_plane_grp_res(struct dpu_soc *dpu,
> +				 struct dpu_plane_grp *grp)
> +{
> +	struct dpu_plane_res *res = &grp->res;
> +	int i, j;
> +	int ret = 0;
> +
> +	INIT_LIST_HEAD(&grp->fu_list);
> +
> +#define DPU_UNITS_GET_FOR_PLANE_GRP(unit)				\
> +do {									\
> +	for (i = 0; i < ARRAY_SIZE(unit##_ids); i++) {			\
> +		if (unit##_types[i] == DPU_DISP)			\
> +			res->unit##_cnt++;				\
> +	}								\
> +									\
> +	res->unit = devm_kcalloc(dpu->dev, res->unit##_cnt,		\
> +				 sizeof(*res->unit), GFP_KERNEL);	\
> +	if (!res->unit)							\
> +		return -ENOMEM;						\
> +									\
> +	for (i = 0, j = 0; i < ARRAY_SIZE(unit##_ids); i++) {		\
> +		if (unit##_types[i] != DPU_DISP)			\
> +			continue;					\
> +									\
> +		res->unit[j] = dpu_##unit##_get(dpu, unit##_ids[i]);	\
> +		if (IS_ERR(res->unit[j])) {				\
> +			ret = PTR_ERR(res->unit[j]);			\
> +			dev_err(dpu->dev,				\
> +				"failed to get %s%d: %d\n",		\
> +				#unit, unit##_ids[i], ret);		\
> +			return ret;					\
> +		}							\
> +		j++;							\
> +	}								\
> +} while (0)
> +
> +	DPU_UNITS_GET_FOR_PLANE_GRP(fd);
> +	DPU_UNITS_GET_FOR_PLANE_GRP(fl);
> +	DPU_UNITS_GET_FOR_PLANE_GRP(fw);
> +	DPU_UNITS_GET_FOR_PLANE_GRP(lb);
> +
> +#define DPU_FETCHUNIT_ADD_TO_PLANE_GRP_LIST(unit)			\
> +do {									\
> +	for (i = res->unit##_cnt - 1; i >= 0; i--)			\
> +		dpu_fu_add_to_list(res->unit[i], &grp->fu_list);	\
> +} while (0)
> +
> +	DPU_FETCHUNIT_ADD_TO_PLANE_GRP_LIST(fd);
> +	DPU_FETCHUNIT_ADD_TO_PLANE_GRP_LIST(fw);
> +	DPU_FETCHUNIT_ADD_TO_PLANE_GRP_LIST(fl);
> +
> +	grp->hw_plane_cnt = res->fd_cnt + res->fl_cnt + res->fw_cnt;
> +
> +	return ret;
> +}
> +
> +static void dpu_put_plane_grp_res(struct dpu_plane_grp *grp)
> +{
> +	struct dpu_plane_res *res = &grp->res;
> +	struct list_head *l, *tmp;
> +	int i;
> +
> +	grp->hw_plane_cnt = 0;
> +
> +	list_for_each_safe(l, tmp, &grp->fu_list)
> +		list_del(l);
> +
> +#define DPU_UNITS_PUT_FOR_PLANE_GRP(unit)		\
> +do {							\
> +	for (i = 0; i < res->unit##_cnt; i++) {		\
> +		if (!IS_ERR_OR_NULL(res->unit[i]))	\
> +			dpu_##unit##_put(res->unit[i]);	\
> +	}						\
> +	res->unit##_cnt = 0;				\
> +} while (0)
> +
> +	DPU_UNITS_PUT_FOR_PLANE_GRP(fd);
> +	DPU_UNITS_PUT_FOR_PLANE_GRP(fl);
> +	DPU_UNITS_PUT_FOR_PLANE_GRP(fw);
> +	DPU_UNITS_PUT_FOR_PLANE_GRP(lb);
> +}
> +
> +static int dpu_add_client_devices(struct dpu_soc *dpu)
> +{
> +	struct device *dev = dpu->dev;
> +	struct dpu_platform_reg *reg;
> +	struct dpu_crtc_grp *crtc_grp;
> +	struct dpu_plane_grp *plane_grp;
> +	size_t client_cnt, reg_size;
> +	int i, id, ret;
> +
> +	client_cnt = ARRAY_SIZE(client_reg);
> +
> +	reg = devm_kcalloc(dev, client_cnt, sizeof(*reg), GFP_KERNEL);
> +	if (!reg)
> +		return -ENOMEM;
> +
> +	crtc_grp = devm_kzalloc(dev, sizeof(*crtc_grp), GFP_KERNEL);
> +	if (!crtc_grp)
> +		return -ENOMEM;
> +
> +	plane_grp = devm_kzalloc(dev, sizeof(*plane_grp), GFP_KERNEL);
> +	if (!plane_grp)
> +		return -ENOMEM;
> +
> +	crtc_grp->plane_grp = plane_grp;
> +
> +	mutex_lock(&dpu_client_id_mutex);
> +	id = dpu_client_id;
> +	dpu_client_id += client_cnt;
> +	mutex_unlock(&dpu_client_id_mutex);
> +
> +	reg_size = client_cnt * sizeof(struct dpu_platform_reg);
> +	memcpy(reg, &client_reg[0], reg_size);
> +
> +	ret = dpu_get_plane_grp_res(dpu, plane_grp);
> +	if (ret)
> +		goto err_get_plane_res;
> +
> +	for (i = 0; i < client_cnt; i++) {
> +		struct platform_device *pdev;
> +		struct device_node *np;
> +
> +		/* Associate subdevice with the corresponding port node. */
> +		np = of_graph_get_port_by_id(dev->of_node, i);
> +		if (!np) {
> +			dev_info(dev,
> +				"no port@%d node in %s, not using DISP%d\n",
> +				i, dev->of_node->full_name, i);
> +			continue;
> +		}
> +
> +		reg[i].pdata.crtc_grp = crtc_grp;
> +
> +		pdev = platform_device_alloc(reg[i].name, id++);
> +		if (!pdev) {
> +			ret = -ENOMEM;
> +			goto err_register;
> +		}
> +
> +		pdev->dev.parent = dev;
> +		pdev->dev.of_node = np;
> +		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
> +		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
> +
> +		reg[i].pdata.of_node = np;
> +		ret = platform_device_add_data(pdev, &reg[i].pdata,
> +					       sizeof(reg[i].pdata));
> +		if (!ret)
> +			ret = platform_device_add(pdev);
> +		if (ret) {
> +			platform_device_put(pdev);
> +			goto err_register;
> +		}
> +	}
> +
> +	return ret;
> +
> +err_register:
> +	platform_device_unregister_children(to_platform_device(dev));
> +err_get_plane_res:
> +	dpu_put_plane_grp_res(plane_grp);
> +
> +	return ret;
> +}
> +
> +static int dpu_core_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	struct dpu_soc *dpu;
> +	struct resource *res;
> +	unsigned long dpu_base;
> +	int ret;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res)
> +		return -ENODEV;
> +
> +	dpu_base = res->start;
> +
> +	dpu = devm_kzalloc(dev, sizeof(*dpu), GFP_KERNEL);
> +	if (!dpu)
> +		return -ENOMEM;
> +
> +	dpu->dev = dev;
> +
> +	dpu->id = of_alias_get_id(np, "dpu");
> +	if (dpu->id < 0) {
> +		dev_err(dev, "failed to get dpu node alias id: %d\n", dpu->id);
> +		return dpu->id;
> +	}
> +
> +	dpu_units_addr_dbg(dpu, dpu_base);
> +
> +	ret = dpu_get_irq(pdev, dpu);
> +	if (ret)
> +		return ret;
> +
> +	dpu->comctrl_reg = devm_ioremap(dev, dpu_base, SZ_512);
> +	if (!dpu->comctrl_reg)
> +		return -ENOMEM;
> +
> +	ret = dpu_attach_pm_domains(dpu);
> +	if (ret)
> +		return ret;
> +
> +	dpu->clk_cfg = devm_clk_get(dev, "cfg");
> +	if (IS_ERR(dpu->clk_cfg)) {
> +		ret = PTR_ERR(dpu->clk_cfg);
> +		dev_err_probe(dev, ret, "failed to get cfg clock\n");
> +		goto failed_clk_cfg_get;
> +	}
> +
> +	dpu->clk_axi = devm_clk_get(dev, "axi");
> +	if (IS_ERR(dpu->clk_axi)) {
> +		ret = PTR_ERR(dpu->clk_axi);
> +		dev_err_probe(dev, ret, "failed to get axi clock\n");
> +		goto failed_clk_axi_get;
> +	}
> +
> +	ret = dpu_irq_init(dpu);
> +	if (ret)
> +		goto failed_irq_init;
> +
> +	ret = dpu_submodules_init(dpu, dpu_base);
> +	if (ret)
> +		goto failed_submodules_init;
> +
> +	platform_set_drvdata(pdev, dpu);
> +
> +	pm_runtime_enable(dev);
> +
> +	ret = dpu_add_client_devices(dpu);
> +	if (ret) {
> +		dev_err(dev, "failed to add client devices: %d\n", ret);
> +		goto failed_add_clients;
> +	}
> +
> +	return ret;
> +
> +failed_add_clients:
> +	pm_runtime_disable(dev);
> +failed_submodules_init:
> +	dpu_irq_exit(dpu);
> +failed_irq_init:
> +failed_clk_axi_get:
> +failed_clk_cfg_get:
> +	dpu_detach_pm_domains(dpu);
> +	return ret;
> +}
> +
> +static int dpu_core_remove(struct platform_device *pdev)
> +{
> +	struct dpu_soc *dpu = platform_get_drvdata(pdev);
> +
> +	platform_device_unregister_children(pdev);
> +	pm_runtime_disable(dpu->dev);
> +	dpu_irq_exit(dpu);
> +	dpu_detach_pm_domains(dpu);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused dpu_runtime_suspend(struct device *dev)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct dpu_soc *dpu = platform_get_drvdata(pdev);
> +
> +	clk_disable_unprepare(dpu->clk_axi);
> +	clk_disable_unprepare(dpu->clk_cfg);
> +
> +	dev_dbg(dev, "suspended\n");
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused dpu_runtime_resume(struct device *dev)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct dpu_soc *dpu = platform_get_drvdata(pdev);
> +	int ret;
> +
> +	ret = clk_prepare_enable(dpu->clk_cfg);
> +	if (ret) {
> +		dev_err(dev, "failed to enable cfg clock: %d\n", ret);
> +		return ret;
> +	}
> +	ret = clk_prepare_enable(dpu->clk_axi);
> +	if (ret) {
> +		clk_disable_unprepare(dpu->clk_cfg);
> +		dev_err(dev, "failed to enable axi clock: %d\n", ret);
> +		return ret;
> +	}
> +
> +	dpu_irq_hw_init(dpu);
> +
> +	dpu_submodules_hw_init(dpu);
> +
> +	dev_dbg(dev, "resumed\n");
> +
> +	return ret;
> +}
> +
> +static const struct dev_pm_ops dpu_pm_ops = {
> +	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> +				     pm_runtime_force_resume)
> +	SET_RUNTIME_PM_OPS(dpu_runtime_suspend, dpu_runtime_resume, NULL)
> +};
> +
> +const struct of_device_id dpu_dt_ids[] = {
> +	{ .compatible = "fsl,imx8qxp-dpu" },

I think you also need to add { .compatible = "fsl,imx8qm-dpu" }?

> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, dpu_dt_ids);
> +
> +struct platform_driver dpu_core_driver = {
> +	.driver = {
> +		.pm = &dpu_pm_ops,
> +		.name = "dpu-core",
> +		.of_match_table = dpu_dt_ids,
> +	},
> +	.probe = dpu_core_probe,
> +	.remove = dpu_core_remove,
> +};
> diff --git a/drivers/gpu/drm/imx/dpu/dpu-crtc.c b/drivers/gpu/drm/imx/dpu/dpu-crtc.c
> new file mode 100644
> index 00000000..d99ed6e
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dpu/dpu-crtc.c
> @@ -0,0 +1,926 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/*
> + * Copyright 2017-2020 NXP
> + */
> +
> +#include <linux/component.h>
> +#include <linux/irq.h>
> +#include <linux/irqflags.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/preempt.h>
> +#include <linux/spinlock.h>
> +
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_atomic_state_helper.h>
> +#include <drm/drm_color_mgmt.h>
> +
> +#include "dpu.h"
> +#include "dpu-crtc.h"
> +#include "dpu-dprc.h"
> +#include "dpu-drv.h"
> +#include "dpu-plane.h"
> +
> +#define DPU_CRTC_WAIT_FOR_COMPLETION_TIMEOUT(_name)			\
> +do {									\
> +	unsigned long ret;						\
> +	ret = wait_for_completion_timeout(&dpu_crtc->_name, HZ);	\
> +	if (ret == 0)							\
> +		drm_err(crtc->dev, "[CRTC:%d:%s] %s: wait for " #_name	\
> +			" timeout\n",					\
> +				crtc->base.id, crtc->name, __func__);	\
> +} while (0)
> +
> +#define DPU_CRTC_WAIT_FOR_FRAMEGEN_FRAME_CNT_MOVING(fg)			\
> +do {									\
> +	if (dpu_fg_wait_for_frame_counter_moving(fg))			\
> +		drm_err(crtc->dev, "[CRTC:%d:%s] %s: "			\
> +			"FrameGen frame counter isn't moving\n",	\
> +				crtc->base.id, crtc->name, __func__);	\
> +} while (0)
> +
> +#define DPU_CRTC_CHECK_FRAMEGEN_FIFO(fg)				\
> +do {									\
> +	if (dpu_fg_secondary_requests_to_read_empty_fifo(fg)) {		\
> +		dpu_fg_secondary_clear_channel_status(fg);		\
> +		drm_err(crtc->dev,					\
> +			"[CRTC:%d:%s] %s: FrameGen FIFO empty\n",	\
> +				crtc->base.id, crtc->name, __func__);	\
> +	}								\
> +} while (0)
> +
> +#define DPU_CRTC_WAIT_FOR_FRAMEGEN_SECONDARY_SYNCUP(fg)			\
> +do {									\
> +	if (dpu_fg_wait_for_secondary_syncup(fg))			\
> +		drm_err(crtc->dev,					\
> +			"[CRTC:%d:%s] %s: "				\
> +			"FrameGen secondary channel isn't syncup\n",	\
> +				crtc->base.id, crtc->name, __func__);	\
> +} while (0)
> +
> +static u32 dpu_crtc_get_vblank_counter(struct drm_crtc *crtc)
> +{
> +	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> +
> +	if (pm_runtime_active(dpu_crtc->dev->parent))
> +		return dpu_fg_get_frame_index(dpu_crtc->fg);
> +	else
> +		return (u32)drm_crtc_vblank_count(crtc);
> +}
> +
> +static int dpu_crtc_enable_vblank(struct drm_crtc *crtc)
> +{
> +	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> +
> +	enable_irq(dpu_crtc->dec_frame_complete_irq);
> +
> +	return 0;
> +}
> +
> +static void dpu_crtc_disable_vblank(struct drm_crtc *crtc)
> +{
> +	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> +
> +	disable_irq_nosync(dpu_crtc->dec_frame_complete_irq);
> +}
> +
> +static irqreturn_t
> +dpu_crtc_dec_frame_complete_irq_handler(int irq, void *dev_id)
> +{
> +	struct dpu_crtc *dpu_crtc = dev_id;
> +	struct drm_crtc *crtc = &dpu_crtc->base;
> +	unsigned long flags;
> +
> +	drm_crtc_handle_vblank(crtc);
> +
> +	spin_lock_irqsave(&crtc->dev->event_lock, flags);
> +	if (dpu_crtc->event) {
> +		drm_crtc_send_vblank_event(crtc, dpu_crtc->event);
> +		dpu_crtc->event = NULL;
> +		drm_crtc_vblank_put(crtc);
> +	}
> +	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +#define DPU_CRTC_IRQ_HANDLER_DEFINE(name)				\
> +static irqreturn_t dpu_crtc_##name##_irq_handler(int irq, void *dev_id)	\
> +{									\
> +	struct dpu_crtc *dpu_crtc = dev_id;				\
> +	complete(&dpu_crtc->name##_done);				\
> +	return IRQ_HANDLED;						\
> +}
> +
> +DPU_CRTC_IRQ_HANDLER_DEFINE(dec_seq_complete)
> +DPU_CRTC_IRQ_HANDLER_DEFINE(dec_shdld)
> +DPU_CRTC_IRQ_HANDLER_DEFINE(ed_cont_shdld)
> +DPU_CRTC_IRQ_HANDLER_DEFINE(ed_safe_shdld)
> +
> +static const struct drm_crtc_funcs dpu_crtc_funcs = {
> +	.reset			= drm_atomic_helper_crtc_reset,
> +	.destroy		= drm_crtc_cleanup,
> +	.set_config		= drm_atomic_helper_set_config,
> +	.page_flip		= drm_atomic_helper_page_flip,
> +	.atomic_duplicate_state	= drm_atomic_helper_crtc_duplicate_state,
> +	.atomic_destroy_state	= drm_atomic_helper_crtc_destroy_state,
> +	.get_vblank_counter	= dpu_crtc_get_vblank_counter,
> +	.enable_vblank		= dpu_crtc_enable_vblank,
> +	.disable_vblank		= dpu_crtc_disable_vblank,
> +	.get_vblank_timestamp	= drm_crtc_vblank_helper_get_vblank_timestamp,
> +	.gamma_set		= drm_atomic_helper_legacy_gamma_set,
> +};
> +
> +static void dpu_crtc_queue_state_event(struct drm_crtc *crtc)
> +{
> +	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> +
> +	spin_lock_irq(&crtc->dev->event_lock);
> +	if (crtc->state->event) {
> +		WARN_ON(drm_crtc_vblank_get(crtc));
> +		WARN_ON(dpu_crtc->event);
> +		dpu_crtc->event = crtc->state->event;
> +		crtc->state->event = NULL;
> +	}
> +	spin_unlock_irq(&crtc->dev->event_lock);
> +}
> +
> +static enum drm_mode_status
> +dpu_crtc_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode)
> +{
> +	if (mode->crtc_clock > DPU_FRAMEGEN_MAX_CLOCK)
> +		return MODE_CLOCK_HIGH;
> +
> +	return MODE_OK;
> +}
> +
> +static void dpu_crtc_pm_runtime_get_sync(struct drm_crtc *crtc)
> +{
> +	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> +	int ret;
> +
> +	ret = pm_runtime_get_sync(dpu_crtc->dev->parent);
> +	if (ret < 0) {
> +		pm_runtime_put_noidle(dpu_crtc->dev->parent);
> +		drm_err(crtc->dev,
> +			"[CRTC:%d:%s]: failed to get parent device RPM sync\n",
> +			 crtc->base.id, crtc->name);
> +	}
> +}
> +
> +static void dpu_crtc_pm_runtime_put(struct drm_crtc *crtc)
> +{
> +	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> +	int ret;
> +
> +	ret = pm_runtime_put(dpu_crtc->dev->parent);
> +	if (ret < 0) {
> +		drm_err(crtc->dev,
> +			"[CRTC:%d:%s]: failed to put parent device RPM\n",
> +			 crtc->base.id, crtc->name);
> +	}
> +}
> +
> +static void dpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
> +{
> +	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> +	struct drm_display_mode *adj = &crtc->state->adjusted_mode;
> +	enum dpu_link_id cf_link;
> +
> +	dpu_crtc_dbg(crtc, "mode " DRM_MODE_FMT "\n", DRM_MODE_ARG(adj));
> +
> +	/* request power-on when we start to set mode for CRTC */
> +	dpu_crtc_pm_runtime_get_sync(crtc);
> +
> +	dpu_fg_displaymode(dpu_crtc->fg, FG_DM_SEC_ON_TOP);
> +	dpu_fg_panic_displaymode(dpu_crtc->fg, FG_DM_CONSTCOL);
> +	dpu_fg_cfg_videomode(dpu_crtc->fg, adj);
> +
> +	dpu_tcon_cfg_videomode(dpu_crtc->tcon, adj);
> +	dpu_tcon_set_fmt(dpu_crtc->tcon);
> +
> +	dpu_cf_framedimensions(dpu_crtc->cf_cont,
> +			       adj->crtc_hdisplay, adj->crtc_vdisplay);
> +	dpu_cf_framedimensions(dpu_crtc->cf_safe,
> +			       adj->crtc_hdisplay, adj->crtc_vdisplay);
> +	/* constframe in content stream shows black frame - CRTC background */
> +	dpu_cf_constantcolor_black(dpu_crtc->cf_cont);
> +	/* constframe in safety stream shows blue frame */
> +	dpu_cf_constantcolor_blue(dpu_crtc->cf_safe);
> +
> +	cf_link = dpu_cf_get_link_id(dpu_crtc->cf_safe);
> +	dpu_ed_pec_src_sel(dpu_crtc->ed_safe, cf_link);
> +
> +	cf_link = dpu_cf_get_link_id(dpu_crtc->cf_cont);
> +	dpu_ed_pec_src_sel(dpu_crtc->ed_cont, cf_link);
> +}
> +
> +static int dpu_crtc_atomic_check_gamma(struct drm_crtc *crtc,
> +				       struct drm_crtc_state *state)
> +{
> +	size_t lut_size;
> +
> +	if (!state->color_mgmt_changed || !state->gamma_lut)
> +		return 0;
> +
> +	if (crtc->state->gamma_lut &&
> +	    (crtc->state->gamma_lut->base.id == state->gamma_lut->base.id))
> +		return 0;
> +
> +	if (state->gamma_lut->length % sizeof(struct drm_color_lut)) {
> +		dpu_crtc_dbg(crtc, "wrong gamma_lut length\n");
> +		return -EINVAL;
> +	}
> +
> +	lut_size = state->gamma_lut->length / sizeof(struct drm_color_lut);
> +	if (lut_size != 256) {
> +		dpu_crtc_dbg(crtc, "gamma_lut size is not 256\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int dpu_crtc_atomic_check(struct drm_crtc *crtc,
> +				 struct drm_atomic_state *state)
> +{
> +	struct drm_crtc_state *crtc_state;
> +	int ret;
> +
> +	crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
> +
> +	ret = dpu_crtc_atomic_check_gamma(crtc, crtc_state);
> +	if (ret)
> +		return ret;
> +
> +	/* force a mode set if the CRTC is changed to active */
> +	if (crtc_state->active_changed && crtc_state->active) {
> +		/*
> +		 * If mode_changed is set by us, call
> +		 * drm_atomic_helper_check_modeset() as it's Kerneldoc requires.
> +		 */
> +		if (!crtc_state->mode_changed) {
> +			crtc_state->mode_changed = true;
> +
> +			ret = drm_atomic_helper_check_modeset(crtc->dev, state);
> +			if (ret)
> +				return ret;
> +		}
> +	}
> +
> +	return ret;
> +}
> +
> +static void dpu_crtc_atomic_begin(struct drm_crtc *crtc,
> +				  struct drm_atomic_state *state)
> +{
> +	struct drm_crtc_state *old_crtc_state;
> +	struct drm_atomic_state *old_state;
> +	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> +	struct drm_plane *plane;
> +	struct drm_plane_state *old_plane_state;
> +	struct dpu_plane_state *old_dpstate;
> +	struct dpu_fetchunit *fu;
> +	const struct dpu_fetchunit_ops *fu_ops;
> +	enum dpu_link_id cf_link;
> +	int i;
> +
> +	old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
> +	old_state = old_crtc_state->state;
> +
> +	/* do nothing if planes keep being disabled */
> +	if (old_crtc_state->plane_mask == 0 && crtc->state->plane_mask == 0)
> +		return;
> +
> +	/* request power-on when any plane starts to be active */
> +	if (old_crtc_state->plane_mask == 0 && crtc->state->plane_mask != 0)
> +		dpu_crtc_pm_runtime_get_sync(crtc);
> +
> +	/*
> +	 * Disable relevant planes' resources in SHADOW only.
> +	 * Whether any of them would be disabled or kept running depends
> +	 * on new plane states in the new global atomic state.
> +	 */
> +	for_each_old_plane_in_state(old_state, plane, old_plane_state, i) {
> +		old_dpstate = to_dpu_plane_state(old_plane_state);
> +
> +		if (!old_plane_state->fb)
> +			continue;
> +
> +		if (old_plane_state->crtc != crtc)
> +			continue;
> +
> +		fu = old_dpstate->source;
> +
> +		fu_ops = dpu_fu_get_ops(fu);
> +
> +		fu_ops->disable_src_buf(fu);
> +
> +		if (old_dpstate->is_top) {
> +			cf_link = dpu_cf_get_link_id(dpu_crtc->cf_cont);
> +			dpu_ed_pec_src_sel(dpu_crtc->ed_cont, cf_link);
> +		}
> +	}
> +}
> +
> +static void dpu_crtc_set_gammacor(struct dpu_crtc *dpu_crtc)
> +{
> +	struct drm_crtc *crtc = &dpu_crtc->base;
> +	struct drm_color_lut *lut;
> +
> +	lut = (struct drm_color_lut *)crtc->state->gamma_lut->data;
> +
> +	dpu_gc_enable_rgb_write(dpu_crtc->gc);
> +	dpu_gc_mode(dpu_crtc->gc, GC_GAMMACOR);
> +
> +	dpu_gc_start_rgb(dpu_crtc->gc, lut);
> +	dpu_gc_delta_rgb(dpu_crtc->gc, lut);
> +}
> +
> +static void dpu_crtc_set_gammacor_sync(struct dpu_crtc *dpu_crtc)
> +{
> +	struct drm_crtc *crtc = &dpu_crtc->base;
> +
> +	enable_irq(dpu_crtc->dec_shdld_irq);
> +
> +	dpu_crtc_set_gammacor(dpu_crtc);
> +	dpu_fg_shdtokgen(dpu_crtc->fg);
> +	DPU_CRTC_WAIT_FOR_COMPLETION_TIMEOUT(dec_shdld_done);
> +
> +	disable_irq(dpu_crtc->dec_shdld_irq);
> +}
> +
> +static void dpu_crtc_disable_gammacor(struct dpu_crtc *dpu_crtc)
> +{
> +	dpu_gc_mode(dpu_crtc->gc, GC_NEUTRAL);
> +	dpu_gc_disable_rgb_write(dpu_crtc->gc);
> +}
> +
> +static void dpu_crtc_disable_gammacor_sync(struct dpu_crtc *dpu_crtc)
> +{
> +	struct drm_crtc *crtc = &dpu_crtc->base;
> +
> +	enable_irq(dpu_crtc->dec_shdld_irq);
> +
> +	dpu_crtc_disable_gammacor(dpu_crtc);
> +	dpu_fg_shdtokgen(dpu_crtc->fg);
> +	DPU_CRTC_WAIT_FOR_COMPLETION_TIMEOUT(dec_shdld_done);
> +
> +	disable_irq(dpu_crtc->dec_shdld_irq);
> +}
> +
> +static void dpu_crtc_atomic_flush(struct drm_crtc *crtc,
> +				  struct drm_atomic_state *state)
> +{
> +	struct drm_crtc_state *old_crtc_state;
> +	struct drm_atomic_state *old_state;
> +	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> +	struct drm_plane *plane;
> +	struct drm_plane_state *old_plane_state;
> +	struct dpu_plane_state *old_dpstate;
> +	struct dpu_fetchunit *fu;
> +	struct dpu_dprc *dprc;
> +	const struct dpu_fetchunit_ops *fu_ops;
> +	bool need_modeset = drm_atomic_crtc_needs_modeset(crtc->state);
> +	unsigned long flags;
> +	int i;
> +
> +	old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
> +	old_state = old_crtc_state->state;
> +
> +	if (old_crtc_state->plane_mask == 0 && crtc->state->plane_mask == 0) {
> +		/* Queue a pending vbl event if necessary. */
> +		if (!need_modeset && crtc->state->active)
> +			dpu_crtc_queue_state_event(crtc);
> +		return;
> +	}
> +
> +	if (!need_modeset && crtc->state->active)
> +		enable_irq(dpu_crtc->ed_cont_shdld_irq);
> +
> +	/*
> +	 * Don't relinquish CPU until DPRC repeat_en is disabled
> +	 * and flush is done(if necessary).
> +	 */
> +	local_irq_save(flags);
> +	preempt_disable();
> +
> +	/*
> +	 * Scan over old plane fetchunits to determine if we
> +	 * need to wait for FrameGen frame counter moving in
> +	 * the next loop prior to DPRC repeat_en disablement
> +	 * or not.
> +	 */
> +	for_each_old_plane_in_state(old_state, plane, old_plane_state, i) {
> +		old_dpstate = to_dpu_plane_state(old_plane_state);
> +
> +		if (!old_plane_state->fb)
> +			continue;
> +
> +		if (old_plane_state->crtc != crtc)
> +			continue;
> +
> +		fu = old_dpstate->source;
> +
> +		fu_ops = dpu_fu_get_ops(fu);
> +
> +		/*
> +		 * Sync with FrameGen frame counter moving so that
> +		 * we may disable DPRC repeat_en correctly.
> +		 */
> +		if (!fu_ops->is_enabled(fu) && !need_modeset &&
> +		    old_crtc_state->active) {
> +			DPU_CRTC_WAIT_FOR_FRAMEGEN_FRAME_CNT_MOVING(dpu_crtc->fg);
> +			break;
> +		}
> +	}
> +
> +	/*
> +	 * Set no stream id for disabled fetchunits of relevant planes.
> +	 * Also, disable DPRC repeat_en if necessary.
> +	 */
> +	for_each_old_plane_in_state(old_state, plane, old_plane_state, i) {
> +		old_dpstate = to_dpu_plane_state(old_plane_state);
> +
> +		if (!old_plane_state->fb)
> +			continue;
> +
> +		if (old_plane_state->crtc != crtc)
> +			continue;
> +
> +		fu = old_dpstate->source;
> +
> +		fu_ops = dpu_fu_get_ops(fu);
> +
> +		if (!fu_ops->is_enabled(fu)) {
> +			fu_ops->set_no_stream_id(fu);
> +
> +			dprc = fu_ops->get_dprc(fu);
> +			dpu_dprc_disable_repeat_en(dprc);
> +		}
> +	}
> +
> +	if (!need_modeset && crtc->state->active) {
> +		/*
> +		 * Flush plane(s) update out to display & queue a pending
> +		 * vbl event if necessary.
> +		 */
> +		dpu_ed_pec_sync_trigger(dpu_crtc->ed_cont);
> +
> +		local_irq_restore(flags);
> +		preempt_enable();
> +
> +		if (old_crtc_state->gamma_lut && !crtc->state->gamma_lut)
> +			dpu_crtc_disable_gammacor_sync(dpu_crtc);
> +		else if (old_crtc_state->gamma_lut && crtc->state->gamma_lut &&
> +			 old_crtc_state->gamma_lut->base.id !=
> +			 crtc->state->gamma_lut->base.id)
> +			dpu_crtc_set_gammacor_sync(dpu_crtc);
> +
> +		DPU_CRTC_WAIT_FOR_COMPLETION_TIMEOUT(ed_cont_shdld_done);
> +
> +		disable_irq(dpu_crtc->ed_cont_shdld_irq);
> +
> +		DPU_CRTC_CHECK_FRAMEGEN_FIFO(dpu_crtc->fg);
> +
> +		dpu_crtc_queue_state_event(crtc);
> +	} else {
> +		/*
> +		 * Simply flush and hope that any update takes effect
> +		 * if CRTC is disabled.  This helps for the case where
> +		 * migrating plane(s) from a disabled CRTC to the other
> +		 * CRTC.
> +		 */
> +		if (!crtc->state->active)
> +			dpu_ed_pec_sync_trigger(dpu_crtc->ed_cont);
> +
> +		local_irq_restore(flags);
> +		preempt_enable();
> +	}
> +
> +	/* request power-off when all planes are off */
> +	if (old_crtc_state->plane_mask != 0 && crtc->state->plane_mask == 0)
> +		dpu_crtc_pm_runtime_put(crtc);
> +}
> +
> +static void dpu_crtc_atomic_enable(struct drm_crtc *crtc,
> +				   struct drm_atomic_state *state)
> +{
> +	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> +	unsigned long flags;
> +
> +	drm_crtc_vblank_on(crtc);
> +
> +	enable_irq(dpu_crtc->dec_shdld_irq);
> +	enable_irq(dpu_crtc->ed_cont_shdld_irq);
> +	enable_irq(dpu_crtc->ed_safe_shdld_irq);
> +
> +	dpu_fg_enable_clock(dpu_crtc->fg);
> +	dpu_ed_pec_sync_trigger(dpu_crtc->ed_cont);
> +	dpu_ed_pec_sync_trigger(dpu_crtc->ed_safe);
> +	if (crtc->state->gamma_lut)
> +		dpu_crtc_set_gammacor(dpu_crtc);
> +	else
> +		dpu_crtc_disable_gammacor(dpu_crtc);
> +	dpu_fg_shdtokgen(dpu_crtc->fg);
> +
> +	/* don't relinquish CPU until TCON is set to operation mode */
> +	local_irq_save(flags);
> +	preempt_disable();
> +	dpu_fg_enable(dpu_crtc->fg);
> +
> +	/*
> +	 * TKT320590:
> +	 * Turn TCON into operation mode as soon as the first dumb
> +	 * frame is generated by DPU(we don't relinquish CPU to ensure
> +	 * this).  This makes DPR/PRG be able to evade the frame.
> +	 */
> +	DPU_CRTC_WAIT_FOR_FRAMEGEN_FRAME_CNT_MOVING(dpu_crtc->fg);
> +	dpu_tcon_set_operation_mode(dpu_crtc->tcon);
> +	local_irq_restore(flags);
> +	preempt_enable();
> +
> +	DPU_CRTC_WAIT_FOR_COMPLETION_TIMEOUT(ed_safe_shdld_done);
> +	DPU_CRTC_WAIT_FOR_COMPLETION_TIMEOUT(ed_cont_shdld_done);
> +	DPU_CRTC_WAIT_FOR_COMPLETION_TIMEOUT(dec_shdld_done);
> +
> +	disable_irq(dpu_crtc->ed_safe_shdld_irq);
> +	disable_irq(dpu_crtc->ed_cont_shdld_irq);
> +	disable_irq(dpu_crtc->dec_shdld_irq);
> +
> +	DPU_CRTC_WAIT_FOR_FRAMEGEN_SECONDARY_SYNCUP(dpu_crtc->fg);
> +
> +	DPU_CRTC_CHECK_FRAMEGEN_FIFO(dpu_crtc->fg);
> +
> +	dpu_crtc_queue_state_event(crtc);
> +}
> +
> +static void dpu_crtc_atomic_disable(struct drm_crtc *crtc,
> +				    struct drm_atomic_state *state)
> +{
> +	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> +	struct drm_plane *plane;
> +	struct drm_plane_state *old_plane_state;
> +	struct dpu_plane_state *old_dpstate;
> +	struct dpu_fetchunit *fu;
> +	struct dpu_dprc *dprc;
> +	const struct dpu_fetchunit_ops *fu_ops;
> +	unsigned long flags;
> +	int i;
> +
> +	enable_irq(dpu_crtc->dec_seq_complete_irq);
> +
> +	/* don't relinquish CPU until DPRC repeat_en is disabled */
> +	local_irq_save(flags);
> +	preempt_disable();
> +	/*
> +	 * Sync to FrameGen frame counter moving so that
> +	 * FrameGen can be disabled in the next frame.
> +	 */
> +	DPU_CRTC_WAIT_FOR_FRAMEGEN_FRAME_CNT_MOVING(dpu_crtc->fg);
> +	dpu_fg_disable(dpu_crtc->fg);
> +	/*
> +	 * There is one frame leftover after FrameGen disablement.
> +	 * Sync to FrameGen frame counter moving so that
> +	 * DPRC repeat_en can be disabled in the next frame.
> +	 */
> +	DPU_CRTC_WAIT_FOR_FRAMEGEN_FRAME_CNT_MOVING(dpu_crtc->fg);
> +
> +	for_each_old_plane_in_state(state, plane, old_plane_state, i) {
> +		old_dpstate = to_dpu_plane_state(old_plane_state);
> +
> +		if (!old_plane_state->fb)
> +			continue;
> +
> +		if (old_plane_state->crtc != crtc)
> +			continue;
> +
> +		fu = old_dpstate->source;
> +
> +		fu_ops = dpu_fu_get_ops(fu);
> +
> +		dprc = fu_ops->get_dprc(fu);
> +		dpu_dprc_disable_repeat_en(dprc);
> +	}
> +
> +	local_irq_restore(flags);
> +	preempt_enable();
> +
> +	DPU_CRTC_WAIT_FOR_COMPLETION_TIMEOUT(dec_seq_complete_done);
> +
> +	disable_irq(dpu_crtc->dec_seq_complete_irq);
> +
> +	dpu_fg_disable_clock(dpu_crtc->fg);
> +
> +	drm_crtc_vblank_off(crtc);
> +
> +	spin_lock_irq(&crtc->dev->event_lock);
> +	if (crtc->state->event && !crtc->state->active) {
> +		drm_crtc_send_vblank_event(crtc, crtc->state->event);
> +		crtc->state->event = NULL;
> +	}
> +	spin_unlock_irq(&crtc->dev->event_lock);
> +
> +	/* request power-off when CRTC is disabled */
> +	dpu_crtc_pm_runtime_put(crtc);
> +}
> +
> +static bool dpu_crtc_get_scanout_position(struct drm_crtc *crtc,
> +					  bool in_vblank_irq,
> +					  int *vpos, int *hpos,
> +					  ktime_t *stime, ktime_t *etime,
> +					  const struct drm_display_mode *mode)
> +{
> +	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> +	int vdisplay = mode->crtc_vdisplay;
> +	int vtotal = mode->crtc_vtotal;
> +	int line;
> +	bool reliable;
> +
> +	if (stime)
> +		*stime = ktime_get();
> +
> +	if (pm_runtime_active(dpu_crtc->dev->parent)) {
> +		/* line index starts with 0 for the first active output line */
> +		line = dpu_fg_get_line_index(dpu_crtc->fg);
> +
> +		if (line < vdisplay)
> +			/* active scanout area - positive */
> +			*vpos = line + 1;
> +		else
> +			/* inside vblank - negative */
> +			*vpos = line - (vtotal - 1);
> +
> +		reliable = true;
> +	} else {
> +		*vpos = 0;
> +		reliable = false;
> +	}
> +
> +	*hpos = 0;
> +
> +	if (etime)
> +		*etime = ktime_get();
> +
> +	return reliable;
> +}
> +
> +static const struct drm_crtc_helper_funcs dpu_helper_funcs = {
> +	.mode_valid		= dpu_crtc_mode_valid,
> +	.mode_set_nofb		= dpu_crtc_mode_set_nofb,
> +	.atomic_check		= dpu_crtc_atomic_check,
> +	.atomic_begin		= dpu_crtc_atomic_begin,
> +	.atomic_flush		= dpu_crtc_atomic_flush,
> +	.atomic_enable		= dpu_crtc_atomic_enable,
> +	.atomic_disable		= dpu_crtc_atomic_disable,
> +	.get_scanout_position	= dpu_crtc_get_scanout_position,
> +};
> +
> +static void dpu_crtc_put_resources(struct dpu_crtc *dpu_crtc)
> +{
> +#define DPU_CRTC_PUT_RSC(unit)				\
> +do {							\
> +	if (!IS_ERR_OR_NULL(dpu_crtc->unit))		\
> +		dpu_##unit##_put(dpu_crtc->unit);	\
> +} while (0)
> +
> +	DPU_CRTC_PUT_RSC(cf_cont);
> +	DPU_CRTC_PUT_RSC(cf_safe);
> +	DPU_CRTC_PUT_RSC(dec);
> +	DPU_CRTC_PUT_RSC(ed_cont);
> +	DPU_CRTC_PUT_RSC(ed_safe);
> +	DPU_CRTC_PUT_RSC(fg);
> +	DPU_CRTC_PUT_RSC(gc);
> +	DPU_CRTC_PUT_RSC(tcon);
> +}
> +
> +static int dpu_crtc_get_resources(struct dpu_crtc *dpu_crtc)
> +{
> +	struct dpu_soc *dpu = dev_get_drvdata(dpu_crtc->dev->parent);
> +	int ret = 0;
> +
> +#define DPU_CRTC_GET_RSC(unit)						\
> +do {									\
> +	dpu_crtc->unit = dpu_##unit##_get(dpu, dpu_crtc->stream_id);	\
> +	if (IS_ERR(dpu_crtc->unit)) {					\
> +		ret = PTR_ERR(dpu_crtc->unit);				\
> +		goto err_out;						\
> +	}								\
> +} while (0)
> +
> +	DPU_CRTC_GET_RSC(cf_cont);
> +	DPU_CRTC_GET_RSC(cf_safe);
> +	DPU_CRTC_GET_RSC(dec);
> +	DPU_CRTC_GET_RSC(ed_cont);
> +	DPU_CRTC_GET_RSC(ed_safe);
> +	DPU_CRTC_GET_RSC(fg);
> +	DPU_CRTC_GET_RSC(gc);
> +	DPU_CRTC_GET_RSC(tcon);
> +
> +	return ret;
> +err_out:
> +	dpu_crtc_put_resources(dpu_crtc);
> +
> +	return ret;
> +}
> +
> +static int dpu_crtc_init(struct dpu_crtc *dpu_crtc,
> +			 struct dpu_client_platformdata *pdata,
> +			 struct dpu_drm_device *dpu_drm)
> +{
> +	struct drm_device *drm = &dpu_drm->base;
> +	struct dpu_soc *dpu = dev_get_drvdata(dpu_crtc->dev->parent);
> +	struct drm_crtc *crtc = &dpu_crtc->base;
> +	struct dpu_plane *dpu_plane;
> +	struct dpu_crtc_grp *crtc_grp = pdata->crtc_grp;
> +	struct dpu_plane_grp *plane_grp = crtc_grp->plane_grp;
> +	unsigned int stream_id = pdata->stream_id;
> +	unsigned int crtc_cnt;
> +	int i, ret;
> +
> +	init_completion(&dpu_crtc->dec_seq_complete_done);
> +	init_completion(&dpu_crtc->dec_shdld_done);
> +	init_completion(&dpu_crtc->ed_cont_shdld_done);
> +	init_completion(&dpu_crtc->ed_safe_shdld_done);
> +
> +	dpu_crtc->grp = crtc_grp;
> +	dpu_crtc->stream_id = stream_id;
> +	dpu_crtc->hw_plane_cnt = plane_grp->hw_plane_cnt;
> +
> +	ret = dpu_crtc_get_resources(dpu_crtc);
> +	if (ret) {
> +		drm_err(drm, "failed to get HW resources for CRTC: %d\n", ret);
> +		return ret;
> +	}
> +
> +	plane_grp->cf[stream_id] = dpu_crtc->cf_cont;
> +	plane_grp->ed[stream_id] = dpu_crtc->ed_cont;
> +
> +	/* each CRTC has a primary plane */
> +	dpu_plane = dpu_plane_initialize(drm, 0, plane_grp,
> +					 DRM_PLANE_TYPE_PRIMARY);
> +	if (IS_ERR(dpu_plane)) {
> +		ret = PTR_ERR(dpu_plane);
> +		drm_err(drm, "failed to init primary plane: %d\n", ret);
> +		goto err_put_resources;
> +	}
> +
> +	drm_crtc_helper_add(crtc, &dpu_helper_funcs);
> +
> +	ret = drm_crtc_init_with_planes(drm, crtc, &dpu_plane->base,
> +					NULL, &dpu_crtc_funcs, NULL);
> +	if (ret) {
> +		drm_err(drm, "failed to add CRTC: %d\n", ret);
> +		goto err_put_resources;
> +	}
> +
> +	/* X server assumes 256 element gamma table so let's use that. */
> +	ret = drm_mode_crtc_set_gamma_size(crtc, 256);
> +	if (ret) {
> +		drm_err(drm, "failed to set CRTC gamma size: %d\n", ret);
> +		goto err_put_resources;
> +	}
> +
> +	drm_crtc_enable_color_mgmt(crtc, 0, false, 256);
> +
> +	dpu_crtc->encoder->possible_crtcs = drm_crtc_mask(crtc);
> +	crtc_grp->crtc_mask |= drm_crtc_mask(crtc);
> +	crtc_cnt = hweight32(crtc_grp->crtc_mask);
> +
> +	/* initialize shared overlay planes for CRTCs in a CRTC group */
> +	if (crtc_cnt == DPU_CRTC_CNT_IN_GRP) {
> +		/*
> +		 * All HW planes in a plane group are shared by CRTCs in a
> +		 * CRTC group.  They will be assigned to either primary plane
> +		 * or overlay plane dynamically in runtime.  Considering a
> +		 * CRTC consumes all HW planes and primary plane takes one
> +		 * HW plane, so overlay plane count for a CRTC group should
> +		 * be plane_grp->hw_plane_cnt - 1.
> +		 */
> +		for (i = 1; i < plane_grp->hw_plane_cnt; i++) {
> +			dpu_plane =
> +				dpu_plane_initialize(drm, crtc_grp->crtc_mask,
> +						     plane_grp,
> +						     DRM_PLANE_TYPE_OVERLAY);
> +			if (IS_ERR(dpu_plane)) {
> +				ret = PTR_ERR(dpu_plane);
> +				drm_err(drm,
> +					"failed to init overlay plane(%d): %d\n",
> +									i, ret);
> +				goto err_put_resources;
> +			}
> +		}
> +	}
> +
> +	ret = pm_runtime_get_sync(dpu_crtc->dev->parent);
> +	if (ret < 0) {
> +		pm_runtime_put_noidle(dpu_crtc->dev->parent);
> +		drm_err(drm, "failed to get parent device RPM sync: %d\n", ret);
> +		goto err_put_resources;
> +	}
> +
> +#define DPU_CRTC_REQUEST_IRQ(name)					\
> +do {									\
> +	dpu_crtc->name##_irq = dpu_map_irq(dpu, pdata->name##_irq);	\
> +	irq_set_status_flags(dpu_crtc->name##_irq, IRQ_DISABLE_UNLAZY);	\
> +	ret = devm_request_irq(dpu_crtc->dev, dpu_crtc->name##_irq,	\
> +			       dpu_crtc_##name##_irq_handler,		\
> +			       0, dev_name(dpu_crtc->dev), dpu_crtc);	\
> +	if (ret < 0) {							\
> +		drm_err(drm, "failed to request irq(%u): %d\n",		\
> +					dpu_crtc->name##_irq, ret);	\
> +		goto err_put_pm_runtime;				\
> +	}								\
> +	disable_irq(dpu_crtc->name##_irq);				\
> +} while (0)
> +
> +	DPU_CRTC_REQUEST_IRQ(dec_frame_complete);
> +	DPU_CRTC_REQUEST_IRQ(dec_seq_complete);
> +	DPU_CRTC_REQUEST_IRQ(dec_shdld);
> +	DPU_CRTC_REQUEST_IRQ(ed_cont_shdld);
> +	DPU_CRTC_REQUEST_IRQ(ed_safe_shdld);

Are these interrupts freed anywhere? Since dpu_crtc_init() is called from
bind() you can't rely on devm to free your resources. You need to explicitly
free them in unbind().

> +
> +	ret = pm_runtime_put(dpu_crtc->dev->parent);
> +	if (ret < 0) {
> +		drm_err(drm, "failed to put parent device RPM: %d\n", ret);
> +		dpu_crtc_put_resources(dpu_crtc);
> +	}
> +
> +	return ret;
> +
> +err_put_pm_runtime:
> +	pm_runtime_put(dpu_crtc->dev->parent);
> +err_put_resources:
> +	dpu_crtc_put_resources(dpu_crtc);
> +
> +	return ret;
> +}
> +
> +static int dpu_crtc_bind(struct device *dev, struct device *master, void *data)
> +{
> +	struct dpu_client_platformdata *pdata = dev->platform_data;
> +	struct dpu_drm_device *dpu_drm = data;
> +	struct dpu_crtc *dpu_crtc;
> +	bool found = false;
> +	int ret;
> +
> +	list_for_each_entry(dpu_crtc, &dpu_drm->crtc_list, node) {
> +		if (dpu_crtc->np == dev->of_node) {
> +			found = true;
> +			break;
> +		}
> +	}
> +
> +	if (!found) {
> +		drm_err(&dpu_drm->base, "failed to find CRTC OF node\n");
> +		return -ENODEV;
> +	}
> +
> +	dpu_crtc->dev = dev;
> +
> +	ret = dpu_crtc_init(dpu_crtc, pdata, dpu_drm);
> +	if (ret)
> +		return ret;
> +
> +	dev_set_drvdata(dev, dpu_crtc);
> +
> +	return ret;
> +}
> +
> +static void dpu_crtc_unbind(struct device *dev, struct device *master,
> +				void *data)
> +{
> +	struct dpu_crtc *dpu_crtc = dev_get_drvdata(dev);
> +
> +	dpu_crtc_put_resources(dpu_crtc);
> +}
> +
> +static const struct component_ops dpu_crtc_ops = {
> +	.bind = dpu_crtc_bind,
> +	.unbind = dpu_crtc_unbind,
> +};
> +
> +static int dpu_crtc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +
> +	if (!dev->platform_data)
> +		return -EINVAL;
> +
> +	return component_add(dev, &dpu_crtc_ops);
> +}
> +
> +static int dpu_crtc_remove(struct platform_device *pdev)
> +{
> +	component_del(&pdev->dev, &dpu_crtc_ops);
> +	return 0;
> +}
> +
> +struct platform_driver dpu_crtc_driver = {
> +	.driver = {
> +		.name = "imx-dpu-crtc",
> +	},
> +	.probe = dpu_crtc_probe,
> +	.remove = dpu_crtc_remove,
> +};

[...]

> diff --git a/drivers/gpu/drm/imx/dpu/dpu-drv.c b/drivers/gpu/drm/imx/dpu/dpu-drv.c
> new file mode 100644
> index 00000000..2416b66
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dpu/dpu-drv.c
> @@ -0,0 +1,296 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/*
> + * Copyright 2019,2020 NXP
> + */
> +
> +#include <linux/component.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_modeset_helper.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_print.h>
> +#include <drm/drm_probe_helper.h>
> +#include <drm/drm_vblank.h>
> +
> +#include "dpu-drv.h"
> +#include "dpu-kms.h"
> +
> +#define DRIVER_NAME	"imx-dpu-drm"
> +
> +static int legacyfb_depth = 32;
> +module_param(legacyfb_depth, uint, 0444);
> +
> +struct dpu_drm_drv_data {
> +	struct list_head crtc_np_list;
> +};
> +
> +DEFINE_DRM_GEM_CMA_FOPS(dpu_drm_driver_fops);
> +
> +static struct drm_driver dpu_drm_driver = {
> +	.driver_features		= DRIVER_MODESET | DRIVER_GEM |
> +					  DRIVER_ATOMIC,
> +	DRM_GEM_CMA_DRIVER_OPS,
> +	.fops				= &dpu_drm_driver_fops,
> +	.name				= "imx-dpu",
> +	.desc				= "i.MX DPU DRM graphics",
> +	.date				= "20200805",
> +	.major				= 1,
> +	.minor				= 0,
> +	.patchlevel			= 0,
> +};
> +
> +static int dpu_drm_bind(struct device *dev)
> +{
> +	struct dpu_drm_device *dpu_drm;
> +	struct drm_device *drm;
> +	struct dpu_drm_drv_data *drv_data = dev_get_drvdata(dev);
> +	int ret;
> +
> +	dpu_drm = devm_drm_dev_alloc(dev, &dpu_drm_driver,
> +				     struct dpu_drm_device, base);
> +	if (IS_ERR(dpu_drm)) {
> +		ret = PTR_ERR(dpu_drm);
> +		DRM_DEV_ERROR(dev, "failed to alloc drm device: %d\n", ret);
> +		return ret;
> +	}
> +
> +	drm = &dpu_drm->base;
> +
> +	drm->irq_enabled = true;
> +
> +	ret = dpu_kms_prepare(dpu_drm, &drv_data->crtc_np_list);
> +	if (ret) {
> +		if (ret != -EPROBE_DEFER)
> +			DRM_DEV_ERROR(dev, "failed to prepare kms: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = component_bind_all(dev, dpu_drm);
> +	if (ret) {
> +		if (ret != -EPROBE_DEFER)
> +			DRM_DEV_ERROR(dev,
> +				      "failed to bind all components: %d\n",
> +									ret);
> +		return ret;
> +	}
> +
> +	drm_mode_config_reset(drm);
> +
> +	drm_kms_helper_poll_init(drm);
> +
> +	ret = drm_dev_register(drm, 0);
> +	if (ret) {
> +		DRM_DEV_ERROR(dev, "failed to register drm device: %d\n", ret);
> +		goto out_register;
> +	}
> +
> +	if (legacyfb_depth != 16 && legacyfb_depth != 32) {
> +		DRM_DEV_INFO(dev,
> +			     "Invalid legacyfb_depth.  Defaulting to 32bpp\n");
> +		legacyfb_depth = 32;
> +	}
> +
> +	drm_fbdev_generic_setup(drm, legacyfb_depth);
> +
> +	dev_set_drvdata(dev, drm);
> +
> +	return ret;
> +
> +out_register:
> +	drm_kms_helper_poll_fini(drm);
> +	component_unbind_all(dev, NULL);
> +
> +	return ret;
> +}
> +
> +static void dpu_drm_unbind(struct device *dev)
> +{
> +	struct drm_device *drm = dev_get_drvdata(dev);
> +
> +	drm_dev_unregister(drm);
> +
> +	drm_kms_helper_poll_fini(drm);
> +
> +	drm_atomic_helper_shutdown(drm);
> +
> +	component_unbind_all(drm->dev, NULL);
> +
> +	dev_set_drvdata(dev, NULL);
> +}
> +
> +static const struct component_master_ops dpu_drm_ops = {
> +	.bind = dpu_drm_bind,
> +	.unbind = dpu_drm_unbind,
> +};
> +
> +static int compare_of(struct device *dev, void *data)
> +{
> +	struct device_node *np = data;
> +
> +	return dev->of_node == np;
> +}
> +
> +static int dpu_drm_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct component_match *match = NULL;
> +	struct device_node *np, *ports, *port;
> +	struct dpu_drm_drv_data *drv_data;
> +	struct dpu_crtc_of_node *crtc_of_node;
> +
> +	drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
> +	if (!drv_data) {
> +		DRM_DEV_ERROR(dev, "failed to alloc driver data\n");
> +		return -ENOMEM;
> +	}
> +
> +	INIT_LIST_HEAD(&drv_data->crtc_np_list);
> +
> +	for_each_matching_node(np, dpu_dt_ids) {
> +		if (!of_device_is_available(np))
> +			continue;
> +
> +		ports = of_get_child_by_name(np, "ports");
> +		if (!ports)
> +			ports = np;
> +
> +		for_each_child_of_node(ports, port) {
> +			drm_of_component_match_add(dev, &match, compare_of,
> +								port);
> +
> +			crtc_of_node = devm_kzalloc(dev, sizeof(*crtc_of_node),
> +								GFP_KERNEL);
> +			if (!crtc_of_node) {
> +				DRM_DEV_ERROR(dev,
> +					      "failed to alloc crtc_of_node\n");

I think you're missing an of_node_put(ports) here.

> +				return -ENOMEM;
> +			}
> +
> +			crtc_of_node->np = port;
> +
> +			list_add(&crtc_of_node->list, &drv_data->crtc_np_list);
> +		}
> +
> +		of_node_put(ports);
> +	}
> +
> +	if (!match) {
> +		DRM_DEV_ERROR(dev, "no available DPU display output port\n");
> +		return -ENODEV;
> +	}
> +
> +	dev_set_drvdata(dev, drv_data);
> +
> +	return component_master_add_with_match(dev, &dpu_drm_ops, match);
> +}
> +
> +static int dpu_drm_remove(struct platform_device *pdev)
> +{
> +	component_master_del(&pdev->dev, &dpu_drm_ops);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused dpu_drm_suspend(struct device *dev)
> +{
> +	struct drm_device *drm_dev = dev_get_drvdata(dev);
> +
> +	return drm_mode_config_helper_suspend(drm_dev);
> +}
> +
> +static int __maybe_unused dpu_drm_resume(struct device *dev)
> +{
> +	struct drm_device *drm_dev = dev_get_drvdata(dev);
> +
> +	return drm_mode_config_helper_resume(drm_dev);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(dpu_drm_pm_ops, dpu_drm_suspend, dpu_drm_resume);
> +
> +static struct platform_driver dpu_drm_platform_driver = {
> +	.probe = dpu_drm_probe,
> +	.remove = dpu_drm_remove,
> +	.driver = {
> +		.name = DRIVER_NAME,
> +		.pm = &dpu_drm_pm_ops,
> +	},
> +};
> +
> +static struct platform_device *dpu_drm_platform_dev;
> +
> +static struct platform_driver * const drivers[] = {
> +	&dpu_prg_driver,
> +	&dpu_dprc_driver,
> +	&dpu_core_driver,
> +	&dpu_crtc_driver,
> +	&dpu_drm_platform_driver,
> +};
> +
> +static int __init dpu_init(void)
> +{
> +	struct platform_device *pdev;
> +	struct device_node *np;
> +	int ret;
> +
> +	ret = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
> +	if (ret)
> +		return ret;
> +
> +	/*
> +	 * If the DT contains at least one available DPU device, instantiate
> +	 * the DRM platform device.
> +	 */
> +	for_each_matching_node(np, dpu_dt_ids) {
> +		if (!of_device_is_available(np))
> +			continue;
> +
> +		pdev = platform_device_alloc(DRIVER_NAME, -1);
> +		if (!pdev) {
> +			ret = -ENOMEM;
> +			goto unregister_drivers;
> +		}
> +
> +		ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
> +		if (ret)
> +			goto unregister_drivers;
> +
> +		ret = platform_device_add(pdev);
> +		if (ret) {
> +			platform_device_put(pdev);
> +			goto unregister_drivers;
> +		}
> +
> +		dpu_drm_platform_dev = pdev;
> +		of_node_put(np);
> +		break;
> +	}
> +
> +	return ret;
> +
> +unregister_drivers:
> +	of_node_put(np);
> +	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
> +	return ret;
> +}
> +module_init(dpu_init);
> +
> +static void __exit dpu_exit(void)
> +{
> +	platform_device_unregister(dpu_drm_platform_dev);
> +	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
> +}
> +module_exit(dpu_exit);
> +
> +MODULE_DESCRIPTION("i.MX DPU DRM Driver");
> +MODULE_AUTHOR("Liu Ying <victor.liu@....com>");
> +MODULE_ALIAS("platform:" DRIVER_NAME);
> +MODULE_LICENSE("GPL v2");

[...]

> diff --git a/drivers/gpu/drm/imx/dpu/dpu-prg.c b/drivers/gpu/drm/imx/dpu/dpu-prg.c
> new file mode 100644
> index 00000000..d9bbfc5
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dpu/dpu-prg.c
> @@ -0,0 +1,389 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/*
> + * Copyright 2017-2020 NXP
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +
> +#include "dpu-prg.h"
> +
> +#define SET			0x4
> +#define CLR			0x8
> +#define TOG			0xc
> +
> +#define PRG_CTRL		0x00
> +#define  BYPASS			BIT(0)
> +#define  SC_DATA_TYPE_8BIT	0
> +#define  SC_DATA_TYPE_10BIT	BIT(2)
> +#define  UV_EN			BIT(3)
> +#define  HANDSHAKE_MODE_4LINES	0
> +#define  HANDSHAKE_MODE_8LINES	BIT(4)
> +#define  SHADOW_LOAD_MODE	BIT(5)
> +#define  DES_DATA_TYPE_32BPP	(0 << 16)
> +#define  DES_DATA_TYPE_24BPP	(1 << 16)
> +#define  DES_DATA_TYPE_16BPP	(2 << 16)
> +#define  DES_DATA_TYPE_8BPP	(3 << 16)
> +#define  SOFTRST		BIT(30)
> +#define  SHADOW_EN		BIT(31)
> +
> +#define PRG_STATUS		0x10
> +#define  BUFFER_VALID_B		BIT(1)
> +#define  BUFFER_VALID_A		BIT(0)
> +
> +#define PRG_REG_UPDATE		0x20
> +#define  REG_UPDATE		BIT(0)
> +
> +#define PRG_STRIDE		0x30
> +#define  STRIDE(n)		(((n) - 1) & 0xffff)
> +
> +#define PRG_HEIGHT		0x40
> +#define  HEIGHT(n)		(((n) - 1) & 0xffff)
> +
> +#define PRG_BADDR		0x50
> +
> +#define PRG_OFFSET		0x60
> +#define  Y(n)			(((n) & 0x7) << 16)
> +#define  X(n)			((n) & 0xffff)
> +
> +#define PRG_WIDTH		0x70
> +#define  WIDTH(n)		(((n) - 1) & 0xffff)
> +
> +#define DPU_PRG_MAX_STRIDE	0x10000
> +
> +struct dpu_prg {
> +	struct device *dev;
> +	void __iomem *base;
> +	struct list_head list;
> +	struct clk *clk_apb;
> +	struct clk *clk_rtram;
> +	bool is_auxiliary;
> +};
> +
> +static DEFINE_MUTEX(dpu_prg_list_mutex);
> +static LIST_HEAD(dpu_prg_list);
> +
> +static inline u32 dpu_prg_read(struct dpu_prg *prg, unsigned int offset)
> +{
> +	return readl(prg->base + offset);
> +}
> +
> +static inline void
> +dpu_prg_write(struct dpu_prg *prg, unsigned int offset, u32 value)
> +{
> +	writel(value, prg->base + offset);
> +}
> +
> +static void dpu_prg_reset(struct dpu_prg *prg)
> +{
> +	usleep_range(10, 20);
> +	dpu_prg_write(prg, PRG_CTRL + SET, SOFTRST);
> +	usleep_range(10, 20);
> +	dpu_prg_write(prg, PRG_CTRL + CLR, SOFTRST);
> +}
> +
> +void dpu_prg_enable(struct dpu_prg *prg)
> +{
> +	dpu_prg_write(prg, PRG_CTRL + CLR, BYPASS);
> +}
> +
> +void dpu_prg_disable(struct dpu_prg *prg)
> +{
> +	dpu_prg_write(prg, PRG_CTRL, BYPASS);
> +}
> +
> +static int dpu_prg_stride_fixup(struct dpu_prg *prg,
> +				unsigned int width, unsigned int x_offset,
> +				unsigned int bits_per_pixel, u64 modifier,
> +				unsigned int *stride, dma_addr_t baddr)
> +{
> +	unsigned int burst_size;
> +	unsigned int mt_w = 0;	/* micro-tile width */
> +
> +	/* prg finer cropping into micro-tile block - top/left start point */
> +	switch (modifier) {
> +	case DRM_FORMAT_MOD_NONE:
> +		break;
> +	case DRM_FORMAT_MOD_VIVANTE_TILED:
> +	case DRM_FORMAT_MOD_VIVANTE_SUPER_TILED:
> +		mt_w = (bits_per_pixel == 16) ? 8 : 4;
> +		break;
> +	default:
> +		dev_err(prg->dev, "unsupported modifier 0x%016llx\n", modifier);
> +		return -EINVAL;
> +	}
> +
> +	if (modifier) {
> +		x_offset %= mt_w;
> +
> +		/* consider x offset to calculate stride */
> +		baddr += x_offset * (bits_per_pixel / 8);
> +	}
> +
> +	/*
> +	 * address TKT343664:
> +	 * fetch unit base address has to align to burst size
> +	 */
> +	burst_size = 1 << __ffs(baddr);
> +	burst_size = round_up(burst_size, 8);
> +	burst_size = min(burst_size, 128U);
> +
> +	/*
> +	 * address TKT339017:
> +	 * fixup for mismatch between burst size and stride
> +	 */
> +	if (modifier)
> +		*stride = round_up(*stride + round_up(baddr % 8, 8),
> +								burst_size);
> +	else
> +		*stride = round_up(*stride, burst_size);
> +
> +	return 0;
> +}
> +
> +void dpu_prg_configure(struct dpu_prg *prg,
> +		       unsigned int width, unsigned int height,
> +		       unsigned int x_offset, unsigned int y_offset,
> +		       unsigned int stride, unsigned int bits_per_pixel,
> +		       dma_addr_t baddr,
> +		       const struct drm_format_info *format, u64 modifier,
> +		       bool start)
> +{
> +	unsigned int burst_size;
> +	u32 val;
> +	int ret;
> +
> +	ret = dpu_prg_stride_fixup(prg, width, x_offset, bits_per_pixel,
> +				   modifier, &stride, baddr);
> +	if (ret)
> +		return;
> +
> +	/*
> +	 * address TKT342628(part 1):
> +	 * when prg stride is less or equals to burst size,
> +	 * the auxiliary prg height needs to be a half
> +	 */
> +	if (prg->is_auxiliary && stride <= burst_size) {

It looks like burst_size is used uninitialized... Or am I missing something?

Thanks,
Laurentiu

> +		height /= 2;
> +		if (modifier)
> +			y_offset /= 2;
> +	}
> +
> +	dpu_prg_write(prg, PRG_STRIDE, STRIDE(stride));
> +	dpu_prg_write(prg, PRG_WIDTH, WIDTH(width));
> +	dpu_prg_write(prg, PRG_HEIGHT, HEIGHT(height));
> +	dpu_prg_write(prg, PRG_OFFSET, X(x_offset) | Y(y_offset));
> +	dpu_prg_write(prg, PRG_BADDR, baddr);
> +
> +	val = SHADOW_LOAD_MODE | SC_DATA_TYPE_8BIT | BYPASS;
> +	if (format->format == DRM_FORMAT_NV21 ||
> +	    format->format == DRM_FORMAT_NV12) {
> +		val |= HANDSHAKE_MODE_8LINES;
> +		/*
> +		 * address TKT342628(part 2):
> +		 * when prg stride is less or equals to burst size,
> +		 * we disable UV_EN bit for the auxiliary prg
> +		 */
> +		if (prg->is_auxiliary && stride > burst_size)
> +			val |= UV_EN;
> +	} else {
> +		val |= HANDSHAKE_MODE_4LINES;
> +	}
> +	switch (bits_per_pixel) {
> +	case 32:
> +		val |= DES_DATA_TYPE_32BPP;
> +		break;
> +	case 24:
> +		val |= DES_DATA_TYPE_24BPP;
> +		break;
> +	case 16:
> +		val |= DES_DATA_TYPE_16BPP;
> +		break;
> +	case 8:
> +		val |= DES_DATA_TYPE_8BPP;
> +		break;
> +	}
> +	/* no shadow for the first frame */
> +	if (!start)
> +		val |= SHADOW_EN;
> +	dpu_prg_write(prg, PRG_CTRL, val);
> +}
> +
> +void dpu_prg_reg_update(struct dpu_prg *prg)
> +{
> +	dpu_prg_write(prg, PRG_REG_UPDATE, REG_UPDATE);
> +}
> +
> +void dpu_prg_shadow_enable(struct dpu_prg *prg)
> +{
> +	dpu_prg_write(prg, PRG_CTRL + SET, SHADOW_EN);
> +}
> +
> +bool dpu_prg_stride_supported(struct dpu_prg *prg,
> +			      unsigned int width, unsigned int x_offset,
> +			      unsigned int bits_per_pixel, u64 modifier,
> +			      unsigned int stride, dma_addr_t baddr)
> +{
> +	int ret;
> +
> +	ret = dpu_prg_stride_fixup(prg, width, x_offset, bits_per_pixel,
> +				   modifier, &stride, baddr);
> +	if (ret)
> +		return false;
> +
> +	if (stride > DPU_PRG_MAX_STRIDE)
> +		return false;
> +
> +	return true;
> +}
> +
> +void dpu_prg_set_auxiliary(struct dpu_prg *prg)
> +{
> +	prg->is_auxiliary = true;
> +}
> +
> +void dpu_prg_set_primary(struct dpu_prg *prg)
> +{
> +	prg->is_auxiliary = false;
> +}
> +
> +struct dpu_prg *
> +dpu_prg_lookup_by_phandle(struct device *dev, const char *name, int index)
> +{
> +	struct device_node *prg_node = of_parse_phandle(dev->of_node,
> +							name, index);
> +	struct dpu_prg *prg;
> +
> +	mutex_lock(&dpu_prg_list_mutex);
> +	list_for_each_entry(prg, &dpu_prg_list, list) {
> +		if (prg_node == prg->dev->of_node) {
> +			mutex_unlock(&dpu_prg_list_mutex);
> +			device_link_add(dev, prg->dev,
> +					DL_FLAG_PM_RUNTIME |
> +					DL_FLAG_AUTOREMOVE_CONSUMER);
> +			return prg;
> +		}
> +	}
> +	mutex_unlock(&dpu_prg_list_mutex);
> +
> +	return NULL;
> +}
> +
> +static const struct of_device_id dpu_prg_dt_ids[] = {
> +	{ .compatible = "fsl,imx8qm-prg", },
> +	{ .compatible = "fsl,imx8qxp-prg", },
> +	{ /* sentinel */ },
> +};
> +
> +static int dpu_prg_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	struct dpu_prg *prg;
> +	int ret;
> +
> +	prg = devm_kzalloc(dev, sizeof(*prg), GFP_KERNEL);
> +	if (!prg)
> +		return -ENOMEM;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	prg->base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(prg->base))
> +		return PTR_ERR(prg->base);
> +
> +	prg->clk_apb = devm_clk_get(dev, "apb");
> +	if (IS_ERR(prg->clk_apb)) {
> +		ret = PTR_ERR(prg->clk_apb);
> +		dev_err_probe(dev, ret, "failed to get apb clock\n");
> +		return ret;
> +	}
> +
> +	prg->clk_rtram = devm_clk_get(dev, "rtram");
> +	if (IS_ERR(prg->clk_rtram)) {
> +		ret = PTR_ERR(prg->clk_rtram);
> +		dev_err_probe(dev, ret, "failed to get rtram clock\n");
> +		return ret;
> +	}
> +
> +	prg->dev = dev;
> +	platform_set_drvdata(pdev, prg);
> +
> +	pm_runtime_enable(dev);
> +
> +	mutex_lock(&dpu_prg_list_mutex);
> +	list_add(&prg->list, &dpu_prg_list);
> +	mutex_unlock(&dpu_prg_list_mutex);
> +
> +	return 0;
> +}
> +
> +static int dpu_prg_remove(struct platform_device *pdev)
> +{
> +	struct dpu_prg *prg = platform_get_drvdata(pdev);
> +
> +	mutex_lock(&dpu_prg_list_mutex);
> +	list_del(&prg->list);
> +	mutex_unlock(&dpu_prg_list_mutex);
> +
> +	pm_runtime_disable(&pdev->dev);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused dpu_prg_runtime_suspend(struct device *dev)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct dpu_prg *prg = platform_get_drvdata(pdev);
> +
> +	clk_disable_unprepare(prg->clk_rtram);
> +	clk_disable_unprepare(prg->clk_apb);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused dpu_prg_runtime_resume(struct device *dev)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct dpu_prg *prg = platform_get_drvdata(pdev);
> +	int ret;
> +
> +	ret = clk_prepare_enable(prg->clk_apb);
> +	if (ret) {
> +		dev_err(dev, "failed to enable apb clock: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = clk_prepare_enable(prg->clk_rtram);
> +	if (ret) {
> +		dev_err(dev, "failed to enable rtramclock: %d\n", ret);
> +		return ret;
> +	}
> +
> +	dpu_prg_reset(prg);
> +
> +	return ret;
> +}
> +
> +static const struct dev_pm_ops dpu_prg_pm_ops = {
> +	SET_RUNTIME_PM_OPS(dpu_prg_runtime_suspend,
> +			   dpu_prg_runtime_resume, NULL)
> +};
> +
> +struct platform_driver dpu_prg_driver = {
> +	.probe = dpu_prg_probe,
> +	.remove = dpu_prg_remove,
> +	.driver = {
> +		.pm = &dpu_prg_pm_ops,
> +		.name = "dpu-prg",
> +		.of_match_table = dpu_prg_dt_ids,
> +	},
> +};

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