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Message-ID: <455969c6-fc1d-5b7b-758f-e2f0652d7043@linux.intel.com>
Date: Fri, 10 Dec 2021 12:44:06 +0100
From: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
To: Kevin Tang <kevin3.tang@...il.com>, mripard@...nel.org,
sean@...rly.run, airlied@...ux.ie, daniel@...ll.ch,
robh+dt@...nel.org, mark.rutland@....com, pony1.wu@...il.com
Cc: orsonzhai@...il.com, zhang.lyra@...il.com,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v8 6/6] drm/sprd: add Unisoc's drm mipi dsi&dphy driver
On 07-12-2021 15:27, Kevin Tang wrote:
> Adds dsi host controller support for the Unisoc's display subsystem.
> Adds dsi phy support for the Unisoc's display subsystem.
> Only MIPI DSI Displays supported, DP/TV/HMDI will be support
> in the feature.
>
> v1:
> - Remove dphy and dsi graph binding, merge the dphy driver into the dsi.
>
> v2:
> - Use drm_xxx to replace all DRM_XXX.
> - Use kzalloc to replace devm_kzalloc for sprd_dsi structure init.
>
> v4:
> - Use drmm_helpers to allocate encoder.
> - Move allocate encoder and connector to bind function.
>
> v5:
> - Drop the dsi ip file prefix.
> - Fix the checkpatch warnings.
> - Add Signed-off-by for dsi&dphy patch.
> - Use the mode_flags of mipi_dsi_device to setup crtc DPI and EDPI mode.
>
> v6:
> - Redesign the way to access the dsi register.
> - Reduce the dsi_context member variables.
>
> v7:
> - Fix codeing style issue by checkpatch.
> - Drop the pll registers structure define.
> - Use bridge API instead of drm panel API.
> - Register mipi_dsi_host on probe phase;
> - Remove some unused function.
>
> v8:
> - Fix missing signed-off-by.
> - Move component_add to dsi_host.attach callback.
>
> Cc: Orson Zhai <orsonzhai@...il.com>
> Cc: Chunyan Zhang <zhang.lyra@...il.com>
> Signed-off-by: Kevin Tang <kevin.tang@...soc.com>
> ---
> drivers/gpu/drm/sprd/Kconfig | 1 +
> drivers/gpu/drm/sprd/Makefile | 8 +-
> drivers/gpu/drm/sprd/megacores_pll.c | 305 ++++++++
> drivers/gpu/drm/sprd/sprd_dpu.c | 13 +
> drivers/gpu/drm/sprd/sprd_drm.c | 1 +
> drivers/gpu/drm/sprd/sprd_drm.h | 1 +
> drivers/gpu/drm/sprd/sprd_dsi.c | 1073 ++++++++++++++++++++++++++
> drivers/gpu/drm/sprd/sprd_dsi.h | 126 +++
> 8 files changed, 1526 insertions(+), 2 deletions(-)
> create mode 100644 drivers/gpu/drm/sprd/megacores_pll.c
> create mode 100644 drivers/gpu/drm/sprd/sprd_dsi.c
> create mode 100644 drivers/gpu/drm/sprd/sprd_dsi.h
>
> diff --git a/drivers/gpu/drm/sprd/Kconfig b/drivers/gpu/drm/sprd/Kconfig
> index 37762c333..3edeaeca0 100644
> --- a/drivers/gpu/drm/sprd/Kconfig
> +++ b/drivers/gpu/drm/sprd/Kconfig
> @@ -5,6 +5,7 @@ config DRM_SPRD
> select DRM_GEM_CMA_HELPER
> select DRM_KMS_CMA_HELPER
> select DRM_KMS_HELPER
> + select DRM_MIPI_DSI
> select VIDEOMODE_HELPERS
> help
> Choose this option if you have a Unisoc chipset.
> diff --git a/drivers/gpu/drm/sprd/Makefile b/drivers/gpu/drm/sprd/Makefile
> index ab12b95e6..e82e6a6f8 100644
> --- a/drivers/gpu/drm/sprd/Makefile
> +++ b/drivers/gpu/drm/sprd/Makefile
> @@ -1,4 +1,8 @@
> # SPDX-License-Identifier: GPL-2.0
>
> -obj-y := sprd_drm.o \
> - sprd_dpu.o
> +sprd-drm-y := sprd_drm.o \
> + sprd_dpu.o \
> + sprd_dsi.o \
> + megacores_pll.o
> +
> +obj-$(CONFIG_DRM_SPRD) += sprd-drm.o
> \ No newline at end of file
> diff --git a/drivers/gpu/drm/sprd/megacores_pll.c b/drivers/gpu/drm/sprd/megacores_pll.c
> new file mode 100644
> index 000000000..3091dfdc1
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/megacores_pll.c
> @@ -0,0 +1,305 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2020 Unisoc Inc.
> + */
> +
> +#include <asm/div64.h>
> +#include <linux/delay.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/regmap.h>
> +#include <linux/string.h>
> +
> +#include "sprd_dsi.h"
> +
> +#define L 0
> +#define H 1
> +#define CLK 0
> +#define DATA 1
> +#define INFINITY 0xffffffff
> +#define MIN_OUTPUT_FREQ (100)
> +
> +#define AVERAGE(a, b) (min(a, b) + abs((b) - (a)) / 2)
> +
> +/* sharkle */
> +#define VCO_BAND_LOW 750
> +#define VCO_BAND_MID 1100
> +#define VCO_BAND_HIGH 1500
> +#define PHY_REF_CLK 26000
> +
> +static int dphy_calc_pll_param(struct dphy_pll *pll)
> +{
> + const u32 khz = 1000;
> + const u32 mhz = 1000000;
> + const unsigned long long factor = 100;
> + unsigned long long tmp;
> + int i;
> +
> + pll->potential_fvco = pll->freq / khz;
> + pll->ref_clk = PHY_REF_CLK / khz;
> +
> + for (i = 0; i < 4; ++i) {
> + if (pll->potential_fvco >= VCO_BAND_LOW &&
> + pll->potential_fvco <= VCO_BAND_HIGH) {
> + pll->fvco = pll->potential_fvco;
> + pll->out_sel = BIT(i);
> + break;
> + }
> + pll->potential_fvco <<= 1;
> + }
> + if (pll->fvco == 0)
> + return -EINVAL;
> +
> + if (pll->fvco >= VCO_BAND_LOW && pll->fvco <= VCO_BAND_MID) {
> + /* vco band control */
> + pll->vco_band = 0x0;
> + /* low pass filter control */
> + pll->lpf_sel = 1;
> + } else if (pll->fvco > VCO_BAND_MID && pll->fvco <= VCO_BAND_HIGH) {
> + pll->vco_band = 0x1;
> + pll->lpf_sel = 0;
> + } else {
> + return -EINVAL;
> + }
> +
> + pll->nint = pll->fvco / pll->ref_clk;
> + tmp = pll->fvco * factor * mhz;
> + do_div(tmp, pll->ref_clk);
> + tmp = tmp - pll->nint * factor * mhz;
> + tmp *= BIT(20);
> + do_div(tmp, 100000000);
> + pll->kint = (u32)tmp;
> + pll->refin = 3; /* pre-divider bypass */
> + pll->sdm_en = true; /* use fraction N PLL */
> + pll->fdk_s = 0x1; /* fraction */
> + pll->cp_s = 0x0;
> + pll->det_delay = 0x1;
> +
> + return 0;
> +}
> +
> +static void dphy_set_pll_reg(struct dphy_pll *pll, struct regmap *regmap)
> +{
> + u8 reg_val[9] = {0};
> + int i;
> +
> + u8 reg_addr[] = {
> + 0x03, 0x04, 0x06, 0x08, 0x09,
> + 0x0a, 0x0b, 0x0e, 0x0f
> + };
> +
> + reg_val[0] = 1 | (1 << 1) | (pll->lpf_sel << 2);
> + reg_val[1] = pll->div | (1 << 3) | (pll->cp_s << 5) | (pll->fdk_s << 7);
> + reg_val[2] = pll->nint;
> + reg_val[3] = pll->vco_band | (pll->sdm_en << 1) | (pll->refin << 2);
> + reg_val[4] = pll->kint >> 12;
> + reg_val[5] = pll->kint >> 4;
> + reg_val[6] = pll->out_sel | ((pll->kint << 4) & 0xf);
> + reg_val[7] = 1 << 4;
> + reg_val[8] = pll->det_delay;
> +
> + for (i = 0; i < sizeof(reg_addr); ++i) {
> + regmap_write(regmap, reg_addr[i], reg_val[i]);
> + DRM_DEBUG("%02x: %02x\n", reg_addr[i], reg_val[i]);
> + }
> +}
> +
> +int dphy_pll_config(struct dsi_context *ctx)
> +{
> + struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
> + struct regmap *regmap = ctx->regmap;
> + struct dphy_pll *pll = &ctx->pll;
> + int ret;
> +
> + pll->freq = dsi->slave->hs_rate;
> +
> + /* FREQ = 26M * (NINT + KINT / 2^20) / out_sel */
> + ret = dphy_calc_pll_param(pll);
> + if (ret) {
> + drm_err(dsi->drm, "failed to calculate dphy pll parameters\n");
> + return ret;
> + }
> + dphy_set_pll_reg(pll, regmap);
> +
> + return 0;
> +}
> +
> +static void dphy_set_timing_reg(struct regmap *regmap, int type, u8 val[])
> +{
> + switch (type) {
> + case REQUEST_TIME:
> + regmap_write(regmap, 0x31, val[CLK]);
> + regmap_write(regmap, 0x41, val[DATA]);
> + regmap_write(regmap, 0x51, val[DATA]);
> + regmap_write(regmap, 0x61, val[DATA]);
> + regmap_write(regmap, 0x71, val[DATA]);
> +
> + regmap_write(regmap, 0x90, val[CLK]);
> + regmap_write(regmap, 0xa0, val[DATA]);
> + regmap_write(regmap, 0xb0, val[DATA]);
> + regmap_write(regmap, 0xc0, val[DATA]);
> + regmap_write(regmap, 0xd0, val[DATA]);
> + break;
> + case PREPARE_TIME:
> + regmap_write(regmap, 0x32, val[CLK]);
> + regmap_write(regmap, 0x42, val[DATA]);
> + regmap_write(regmap, 0x52, val[DATA]);
> + regmap_write(regmap, 0x62, val[DATA]);
> + regmap_write(regmap, 0x72, val[DATA]);
> +
> + regmap_write(regmap, 0x91, val[CLK]);
> + regmap_write(regmap, 0xa1, val[DATA]);
> + regmap_write(regmap, 0xb1, val[DATA]);
> + regmap_write(regmap, 0xc1, val[DATA]);
> + regmap_write(regmap, 0xd1, val[DATA]);
> + break;
> + case ZERO_TIME:
> + regmap_write(regmap, 0x33, val[CLK]);
> + regmap_write(regmap, 0x43, val[DATA]);
> + regmap_write(regmap, 0x53, val[DATA]);
> + regmap_write(regmap, 0x63, val[DATA]);
> + regmap_write(regmap, 0x73, val[DATA]);
> +
> + regmap_write(regmap, 0x92, val[CLK]);
> + regmap_write(regmap, 0xa2, val[DATA]);
> + regmap_write(regmap, 0xb2, val[DATA]);
> + regmap_write(regmap, 0xc2, val[DATA]);
> + regmap_write(regmap, 0xd2, val[DATA]);
> + break;
> + case TRAIL_TIME:
> + regmap_write(regmap, 0x34, val[CLK]);
> + regmap_write(regmap, 0x44, val[DATA]);
> + regmap_write(regmap, 0x54, val[DATA]);
> + regmap_write(regmap, 0x64, val[DATA]);
> + regmap_write(regmap, 0x74, val[DATA]);
> +
> + regmap_write(regmap, 0x93, val[CLK]);
> + regmap_write(regmap, 0xa3, val[DATA]);
> + regmap_write(regmap, 0xb3, val[DATA]);
> + regmap_write(regmap, 0xc3, val[DATA]);
> + regmap_write(regmap, 0xd3, val[DATA]);
> + break;
> + case EXIT_TIME:
> + regmap_write(regmap, 0x36, val[CLK]);
> + regmap_write(regmap, 0x46, val[DATA]);
> + regmap_write(regmap, 0x56, val[DATA]);
> + regmap_write(regmap, 0x66, val[DATA]);
> + regmap_write(regmap, 0x76, val[DATA]);
> +
> + regmap_write(regmap, 0x95, val[CLK]);
> + regmap_write(regmap, 0xA5, val[DATA]);
> + regmap_write(regmap, 0xB5, val[DATA]);
> + regmap_write(regmap, 0xc5, val[DATA]);
> + regmap_write(regmap, 0xd5, val[DATA]);
> + break;
> + case CLKPOST_TIME:
> + regmap_write(regmap, 0x35, val[CLK]);
> + regmap_write(regmap, 0x94, val[CLK]);
> + break;
> +
> + /* the following just use default value */
> + case SETTLE_TIME:
> + fallthrough;
> + case TA_GET:
> + fallthrough;
> + case TA_GO:
> + fallthrough;
> + case TA_SURE:
> + fallthrough;
> + default:
> + break;
> + }
> +}
> +
> +void dphy_timing_config(struct dsi_context *ctx)
> +{
> + struct regmap *regmap = ctx->regmap;
> + struct dphy_pll *pll = &ctx->pll;
> + const u32 factor = 2;
> + const u32 scale = 100;
> + u32 t_ui, t_byteck, t_half_byteck;
> + u32 range[2], constant;
> + u8 val[2];
> + u32 tmp = 0;
> +
> + /* t_ui: 1 ui, byteck: 8 ui, half byteck: 4 ui */
> + t_ui = 1000 * scale / (pll->freq / 1000);
> + t_byteck = t_ui << 3;
> + t_half_byteck = t_ui << 2;
> + constant = t_ui << 1;
> +
> + /* REQUEST_TIME: HS T-LPX: LP-01
> + * For T-LPX, mipi spec defined min value is 50ns,
> + * but maybe it shouldn't be too small, because BTA,
> + * LP-10, LP-00, LP-01, all of this is related to T-LPX.
> + */
> + range[L] = 50 * scale;
> + range[H] = INFINITY;
> + val[CLK] = DIV_ROUND_UP(range[L] * (factor << 1), t_byteck) - 2;
> + val[DATA] = val[CLK];
> + dphy_set_timing_reg(regmap, REQUEST_TIME, val);
> +
> + /* PREPARE_TIME: HS sequence: LP-00 */
> + range[L] = 38 * scale;
> + range[H] = 95 * scale;
> + tmp = AVERAGE(range[L], range[H]);
> + val[CLK] = DIV_ROUND_UP(AVERAGE(range[L], range[H]), t_half_byteck) - 1;
> + range[L] = 40 * scale + 4 * t_ui;
> + range[H] = 85 * scale + 6 * t_ui;
> + tmp |= AVERAGE(range[L], range[H]) << 16;
> + val[DATA] = DIV_ROUND_UP(AVERAGE(range[L], range[H]), t_half_byteck) - 1;
> + dphy_set_timing_reg(regmap, PREPARE_TIME, val);
> +
> + /* ZERO_TIME: HS-ZERO */
> + range[L] = 300 * scale;
> + range[H] = INFINITY;
> + val[CLK] = DIV_ROUND_UP(range[L] * factor + (tmp & 0xffff)
> + - 525 * t_byteck / 100, t_byteck) - 2;
> + range[L] = 145 * scale + 10 * t_ui;
> + val[DATA] = DIV_ROUND_UP(range[L] * factor
> + + ((tmp >> 16) & 0xffff) - 525 * t_byteck / 100,
> + t_byteck) - 2;
> + dphy_set_timing_reg(regmap, ZERO_TIME, val);
> +
> + /* TRAIL_TIME: HS-TRAIL */
> + range[L] = 60 * scale;
> + range[H] = INFINITY;
> + val[CLK] = DIV_ROUND_UP(range[L] * factor - constant, t_half_byteck);
> + range[L] = max(8 * t_ui, 60 * scale + 4 * t_ui);
> + val[DATA] = DIV_ROUND_UP(range[L] * 3 / 2 - constant, t_half_byteck) - 2;
> + dphy_set_timing_reg(regmap, TRAIL_TIME, val);
> +
> + /* EXIT_TIME: */
> + range[L] = 100 * scale;
> + range[H] = INFINITY;
> + val[CLK] = DIV_ROUND_UP(range[L] * factor, t_byteck) - 2;
> + val[DATA] = val[CLK];
> + dphy_set_timing_reg(regmap, EXIT_TIME, val);
> +
> + /* CLKPOST_TIME: */
> + range[L] = 60 * scale + 52 * t_ui;
> + range[H] = INFINITY;
> + val[CLK] = DIV_ROUND_UP(range[L] * factor, t_byteck) - 2;
> + val[DATA] = val[CLK];
> + dphy_set_timing_reg(regmap, CLKPOST_TIME, val);
> +
> + /* SETTLE_TIME:
> + * This time is used for receiver. So for transmitter,
> + * it can be ignored.
> + */
> +
> + /* TA_GO:
> + * transmitter drives bridge state(LP-00) before releasing control,
> + * reg 0x1f default value: 0x04, which is good.
> + */
> +
> + /* TA_SURE:
> + * After LP-10 state and before bridge state(LP-00),
> + * reg 0x20 default value: 0x01, which is good.
> + */
> +
> + /* TA_GET:
> + * receiver drives Bridge state(LP-00) before releasing control
> + * reg 0x21 default value: 0x03, which is good.
> + */
> +}
> diff --git a/drivers/gpu/drm/sprd/sprd_dpu.c b/drivers/gpu/drm/sprd/sprd_dpu.c
> index 1d10d0998..06a3414ee 100644
> --- a/drivers/gpu/drm/sprd/sprd_dpu.c
> +++ b/drivers/gpu/drm/sprd/sprd_dpu.c
> @@ -25,6 +25,7 @@
>
> #include "sprd_drm.h"
> #include "sprd_dpu.h"
> +#include "sprd_dsi.h"
>
> /* Global control registers */
> #define REG_DPU_CTRL 0x04
> @@ -618,9 +619,21 @@ static void sprd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> {
> struct sprd_dpu *dpu = to_sprd_crtc(crtc);
> struct drm_display_mode *mode = &crtc->state->adjusted_mode;
> + struct drm_encoder *encoder;
> + struct sprd_dsi *dsi;
>
> drm_display_mode_to_videomode(mode, &dpu->ctx.vm);
>
> + drm_for_each_encoder_mask(encoder, crtc->dev,
> + crtc->state->encoder_mask) {
> + dsi = encoder_to_dsi(encoder);
> +
> + if (dsi->slave->mode_flags & MIPI_DSI_MODE_VIDEO)
> + dpu->ctx.if_type = SPRD_DPU_IF_DPI;
> + else
> + dpu->ctx.if_type = SPRD_DPU_IF_EDPI;
> + }
> +
> sprd_dpi_init(dpu);
> }
>
> diff --git a/drivers/gpu/drm/sprd/sprd_drm.c b/drivers/gpu/drm/sprd/sprd_drm.c
> index 59b9e54f7..a077e2d4d 100644
> --- a/drivers/gpu/drm/sprd/sprd_drm.c
> +++ b/drivers/gpu/drm/sprd/sprd_drm.c
> @@ -181,6 +181,7 @@ static struct platform_driver sprd_drm_driver = {
> static struct platform_driver *sprd_drm_drivers[] = {
> &sprd_drm_driver,
> &sprd_dpu_driver,
> + &sprd_dsi_driver,
> };
>
> static int __init sprd_drm_init(void)
> diff --git a/drivers/gpu/drm/sprd/sprd_drm.h b/drivers/gpu/drm/sprd/sprd_drm.h
> index 85d4a8b9f..95d1b972f 100644
> --- a/drivers/gpu/drm/sprd/sprd_drm.h
> +++ b/drivers/gpu/drm/sprd/sprd_drm.h
> @@ -14,5 +14,6 @@ struct sprd_drm {
> };
>
> extern struct platform_driver sprd_dpu_driver;
> +extern struct platform_driver sprd_dsi_driver;
>
> #endif /* _SPRD_DRM_H_ */
> diff --git a/drivers/gpu/drm/sprd/sprd_dsi.c b/drivers/gpu/drm/sprd/sprd_dsi.c
> new file mode 100644
> index 000000000..911b3cddc
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/sprd_dsi.c
> @@ -0,0 +1,1073 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2020 Unisoc Inc.
> + */
> +
> +#include <linux/component.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_graph.h>
> +#include <video/mipi_display.h>
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_probe_helper.h>
> +
> +#include "sprd_drm.h"
> +#include "sprd_dpu.h"
> +#include "sprd_dsi.h"
> +
> +#define SOFT_RESET 0x04
> +#define MASK_PROTOCOL_INT 0x0C
> +#define MASK_INTERNAL_INT 0x14
> +#define DSI_MODE_CFG 0x18
> +
> +#define VIRTUAL_CHANNEL_ID 0x1C
> +#define GEN_RX_VCID GENMASK(1, 0)
> +#define VIDEO_PKT_VCID GENMASK(3, 2)
> +
> +#define DPI_VIDEO_FORMAT 0x20
> +#define DPI_VIDEO_MODE_FORMAT GENMASK(5, 0)
> +#define LOOSELY18_EN BIT(6)
> +
> +#define VIDEO_PKT_CONFIG 0x24
> +#define VIDEO_PKT_SIZE GENMASK(15, 0)
> +#define VIDEO_LINE_CHUNK_NUM GENMASK(31, 16)
> +
> +#define VIDEO_LINE_HBLK_TIME 0x28
> +#define VIDEO_LINE_HBP_TIME GENMASK(15, 0)
> +#define VIDEO_LINE_HSA_TIME GENMASK(31, 16)
> +
> +#define VIDEO_LINE_TIME 0x2C
> +
> +#define VIDEO_VBLK_LINES 0x30
> +#define VFP_LINES GENMASK(9, 0)
> +#define VBP_LINES GENMASK(19, 10)
> +#define VSA_LINES GENMASK(29, 20)
> +
> +#define VIDEO_VACTIVE_LINES 0x34
> +
> +#define VID_MODE_CFG 0x38
> +#define VID_MODE_TYPE GENMASK(1, 0)
> +#define LP_VSA_EN BIT(8)
> +#define LP_VBP_EN BIT(9)
> +#define LP_VFP_EN BIT(10)
> +#define LP_VACT_EN BIT(11)
> +#define LP_HBP_EN BIT(12)
> +#define LP_HFP_EN BIT(13)
> +#define FRAME_BTA_ACK_EN BIT(14)
> +
> +#define TIMEOUT_CNT_CLK_CONFIG 0x40
> +#define HTX_TO_CONFIG 0x44
> +#define LRX_H_TO_CONFIG 0x48
> +
> +#define TX_ESC_CLK_CONFIG 0x5C
> +
> +#define CMD_MODE_CFG 0x68
> +#define TEAR_FX_EN BIT(0)
> +
> +#define GEN_HDR 0x6C
> +#define GEN_DT GENMASK(5, 0)
> +#define GEN_VC GENMASK(7, 6)
> +
> +#define GEN_PLD_DATA 0x70
> +
> +#define PHY_CLK_LANE_LP_CTRL 0x74
> +#define PHY_CLKLANE_TX_REQ_HS BIT(0)
> +#define AUTO_CLKLANE_CTRL_EN BIT(1)
> +
> +#define PHY_INTERFACE_CTRL 0x78
> +#define RF_PHY_SHUTDOWN BIT(0)
> +#define RF_PHY_RESET_N BIT(1)
> +#define RF_PHY_CLK_EN BIT(2)
> +
> +#define CMD_MODE_STATUS 0x98
> +#define GEN_CMD_RDATA_FIFO_EMPTY BIT(1)
> +#define GEN_CMD_WDATA_FIFO_EMPTY BIT(3)
> +#define GEN_CMD_CMD_FIFO_EMPTY BIT(5)
> +#define GEN_CMD_RDCMD_DONE BIT(7)
> +
> +#define PHY_STATUS 0x9C
> +#define PHY_LOCK BIT(1)
> +
> +#define PHY_MIN_STOP_TIME 0xA0
> +#define PHY_LANE_NUM_CONFIG 0xA4
> +
> +#define PHY_CLKLANE_TIME_CONFIG 0xA8
> +#define PHY_CLKLANE_LP_TO_HS_TIME GENMASK(15, 0)
> +#define PHY_CLKLANE_HS_TO_LP_TIME GENMASK(31, 16)
> +
> +#define PHY_DATALANE_TIME_CONFIG 0xAC
> +#define PHY_DATALANE_LP_TO_HS_TIME GENMASK(15, 0)
> +#define PHY_DATALANE_HS_TO_LP_TIME GENMASK(31, 16)
> +
> +#define MAX_READ_TIME 0xB0
> +
> +#define RX_PKT_CHECK_CONFIG 0xB4
> +#define RX_PKT_ECC_EN BIT(0)
> +#define RX_PKT_CRC_EN BIT(1)
> +
> +#define TA_EN 0xB8
> +
> +#define EOTP_EN 0xBC
> +#define TX_EOTP_EN BIT(0)
> +#define RX_EOTP_EN BIT(1)
> +
> +#define VIDEO_NULLPKT_SIZE 0xC0
> +#define DCS_WM_PKT_SIZE 0xC4
> +
> +#define VIDEO_SIG_DELAY_CONFIG 0xD0
> +#define VIDEO_SIG_DELAY GENMASK(23, 0)
> +
> +#define PHY_TST_CTRL0 0xF0
> +#define PHY_TESTCLR BIT(0)
> +#define PHY_TESTCLK BIT(1)
> +
> +#define PHY_TST_CTRL1 0xF4
> +#define PHY_TESTDIN GENMASK(7, 0)
> +#define PHY_TESTDOUT GENMASK(15, 8)
> +#define PHY_TESTEN BIT(16)
> +
> +#define host_to_dsi(host) \
> + container_of(host, struct sprd_dsi, host)
> +
> +static inline u32
> +dsi_reg_rd(struct dsi_context *ctx, u32 offset, u32 mask,
> + u32 shift)
> +{
> + return (readl(ctx->base + offset) & mask) >> shift;
> +}
> +
> +static inline void
> +dsi_reg_wr(struct dsi_context *ctx, u32 offset, u32 mask,
> + u32 shift, u32 val)
> +{
> + u32 ret;
> +
> + ret = readl(ctx->base + offset);
> + ret &= ~mask;
> + ret |= (val << shift) & mask;
> + writel(ret, ctx->base + offset);
> +}
> +
> +static inline void
> +dsi_reg_up(struct dsi_context *ctx, u32 offset, u32 mask,
> + u32 val)
> +{
> + u32 ret = readl(ctx->base + offset);
> +
> + writel((ret & ~mask) | (val & mask), ctx->base + offset);
> +}
> +
> +static int regmap_tst_io_write(void *context, u32 reg, u32 val)
> +{
> + struct sprd_dsi *dsi = context;
> + struct dsi_context *ctx = &dsi->ctx;
> +
> + if (val > 0xff || reg > 0xff)
> + return -EINVAL;
> +
> + drm_dbg(dsi->drm, "reg = 0x%02x, val = 0x%02x\n", reg, val);
> +
> + dsi_reg_up(ctx, PHY_TST_CTRL1, PHY_TESTEN, PHY_TESTEN);
> + dsi_reg_wr(ctx, PHY_TST_CTRL1, PHY_TESTDIN, 0, reg);
> + dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLK, PHY_TESTCLK);
> + dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLK, 0);
> + dsi_reg_up(ctx, PHY_TST_CTRL1, PHY_TESTEN, 0);
> + dsi_reg_wr(ctx, PHY_TST_CTRL1, PHY_TESTDIN, 0, val);
> + dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLK, PHY_TESTCLK);
> + dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLK, 0);
> +
> + return 0;
> +}
> +
> +static int regmap_tst_io_read(void *context, u32 reg, u32 *val)
> +{
> + struct sprd_dsi *dsi = context;
> + struct dsi_context *ctx = &dsi->ctx;
> + int ret;
> +
> + if (reg > 0xff)
> + return -EINVAL;
> +
> + dsi_reg_up(ctx, PHY_TST_CTRL1, PHY_TESTEN, PHY_TESTEN);
> + dsi_reg_wr(ctx, PHY_TST_CTRL1, PHY_TESTDIN, 0, reg);
> + dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLK, PHY_TESTCLK);
> + dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLK, 0);
> + dsi_reg_up(ctx, PHY_TST_CTRL1, PHY_TESTEN, 0);
> +
> + udelay(1);
> +
> + ret = dsi_reg_rd(ctx, PHY_TST_CTRL1, PHY_TESTDOUT, 8);
> + if (ret < 0)
> + return ret;
> +
> + *val = ret;
> +
> + drm_dbg(dsi->drm, "reg = 0x%02x, val = 0x%02x\n", reg, *val);
> + return 0;
> +}
> +
> +static struct regmap_bus regmap_tst_io = {
> + .reg_write = regmap_tst_io_write,
> + .reg_read = regmap_tst_io_read,
> +};
> +
> +static const struct regmap_config byte_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> +};
> +
> +static int dphy_wait_pll_locked(struct dsi_context *ctx)
> +{
> + struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
> + int i;
> +
> + for (i = 0; i < 50000; i++) {
> + if (dsi_reg_rd(ctx, PHY_STATUS, PHY_LOCK, 1))
> + return 0;
> + udelay(3);
> + }
> +
> + drm_err(dsi->drm, "dphy pll can not be locked\n");
> + return -ETIMEDOUT;
> +}
> +
> +static int dsi_wait_tx_payload_fifo_empty(struct dsi_context *ctx)
> +{
> + int i;
> +
> + for (i = 0; i < 5000; i++) {
> + if (dsi_reg_rd(ctx, CMD_MODE_STATUS, GEN_CMD_WDATA_FIFO_EMPTY, 3))
> + return 0;
> + udelay(1);
> + }
> +
> + return -ETIMEDOUT;
> +}
> +
> +static int dsi_wait_tx_cmd_fifo_empty(struct dsi_context *ctx)
> +{
> + int i;
> +
> + for (i = 0; i < 5000; i++) {
> + if (dsi_reg_rd(ctx, CMD_MODE_STATUS, GEN_CMD_CMD_FIFO_EMPTY, 5))
> + return 0;
> + udelay(1);
> + }
> +
> + return -ETIMEDOUT;
> +}
> +
> +static int dsi_wait_rd_resp_completed(struct dsi_context *ctx)
> +{
> + int i;
> +
> + for (i = 0; i < 10000; i++) {
> + if (dsi_reg_rd(ctx, CMD_MODE_STATUS, GEN_CMD_RDCMD_DONE, 7))
> + return 0;
> + udelay(10);
> + }
> +
> + return -ETIMEDOUT;
> +}
> +
> +static u16 calc_bytes_per_pixel_x100(int coding)
> +{
> + u16 bpp_x100;
> +
> + switch (coding) {
> + case COLOR_CODE_16BIT_CONFIG1:
> + case COLOR_CODE_16BIT_CONFIG2:
> + case COLOR_CODE_16BIT_CONFIG3:
> + bpp_x100 = 200;
> + break;
> + case COLOR_CODE_18BIT_CONFIG1:
> + case COLOR_CODE_18BIT_CONFIG2:
> + bpp_x100 = 225;
> + break;
> + case COLOR_CODE_24BIT:
> + bpp_x100 = 300;
> + break;
> + case COLOR_CODE_COMPRESSTION:
> + bpp_x100 = 100;
> + break;
> + case COLOR_CODE_20BIT_YCC422_LOOSELY:
> + bpp_x100 = 250;
> + break;
> + case COLOR_CODE_24BIT_YCC422:
> + bpp_x100 = 300;
> + break;
> + case COLOR_CODE_16BIT_YCC422:
> + bpp_x100 = 200;
> + break;
> + case COLOR_CODE_30BIT:
> + bpp_x100 = 375;
> + break;
> + case COLOR_CODE_36BIT:
> + bpp_x100 = 450;
> + break;
> + case COLOR_CODE_12BIT_YCC420:
> + bpp_x100 = 150;
> + break;
> + default:
> + DRM_ERROR("invalid color coding");
> + bpp_x100 = 0;
> + break;
> + }
> +
> + return bpp_x100;
> +}
> +
> +static u8 calc_video_size_step(int coding)
> +{
> + u8 video_size_step;
> +
> + switch (coding) {
> + case COLOR_CODE_16BIT_CONFIG1:
> + case COLOR_CODE_16BIT_CONFIG2:
> + case COLOR_CODE_16BIT_CONFIG3:
> + case COLOR_CODE_18BIT_CONFIG1:
> + case COLOR_CODE_18BIT_CONFIG2:
> + case COLOR_CODE_24BIT:
> + case COLOR_CODE_COMPRESSTION:
> + return video_size_step = 1;
> + case COLOR_CODE_20BIT_YCC422_LOOSELY:
> + case COLOR_CODE_24BIT_YCC422:
> + case COLOR_CODE_16BIT_YCC422:
> + case COLOR_CODE_30BIT:
> + case COLOR_CODE_36BIT:
> + case COLOR_CODE_12BIT_YCC420:
> + return video_size_step = 2;
> + default:
> + DRM_ERROR("invalid color coding");
> + return 0;
> + }
> +}
> +
> +static u16 round_video_size(int coding, u16 video_size)
> +{
> + switch (coding) {
> + case COLOR_CODE_16BIT_YCC422:
> + case COLOR_CODE_24BIT_YCC422:
> + case COLOR_CODE_20BIT_YCC422_LOOSELY:
> + case COLOR_CODE_12BIT_YCC420:
> + /* round up active H pixels to a multiple of 2 */
> + if ((video_size % 2) != 0)
> + video_size += 1;
> + break;
> + default:
> + break;
> + }
> +
> + return video_size;
> +}
> +
> +#define SPRD_MIPI_DSI_FMT_DSC 0xff
> +static u32 fmt_to_coding(u32 fmt)
> +{
> + switch (fmt) {
> + case MIPI_DSI_FMT_RGB565:
> + return COLOR_CODE_16BIT_CONFIG1;
> + case MIPI_DSI_FMT_RGB666:
> + case MIPI_DSI_FMT_RGB666_PACKED:
> + return COLOR_CODE_18BIT_CONFIG1;
> + case MIPI_DSI_FMT_RGB888:
> + return COLOR_CODE_24BIT;
> + case SPRD_MIPI_DSI_FMT_DSC:
> + return COLOR_CODE_COMPRESSTION;
> + default:
> + DRM_ERROR("Unsupported format (%d)\n", fmt);
> + return COLOR_CODE_24BIT;
> + }
> +}
> +
> +#define ns_to_cycle(ns, byte_clk) \
> + DIV_ROUND_UP((ns) * (byte_clk), 1000000)
> +
> +static void sprd_dsi_init(struct dsi_context *ctx)
> +{
> + struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
> + u32 byte_clk = dsi->slave->hs_rate / 8;
> + u16 data_hs2lp, data_lp2hs, clk_hs2lp, clk_lp2hs;
> + u16 max_rd_time;
> + int div;
> +
> + writel(0, ctx->base + SOFT_RESET);
> + writel(0xffffffff, ctx->base + MASK_PROTOCOL_INT);
> + writel(0xffffffff, ctx->base + MASK_INTERNAL_INT);
> + writel(1, ctx->base + DSI_MODE_CFG);
> + dsi_reg_up(ctx, EOTP_EN, RX_EOTP_EN, 0);
> + dsi_reg_up(ctx, EOTP_EN, TX_EOTP_EN, 0);
> + dsi_reg_up(ctx, RX_PKT_CHECK_CONFIG, RX_PKT_ECC_EN, RX_PKT_ECC_EN);
> + dsi_reg_up(ctx, RX_PKT_CHECK_CONFIG, RX_PKT_CRC_EN, RX_PKT_CRC_EN);
> + writel(1, ctx->base + TA_EN);
> + dsi_reg_up(ctx, VIRTUAL_CHANNEL_ID, VIDEO_PKT_VCID, 0);
> + dsi_reg_up(ctx, VIRTUAL_CHANNEL_ID, GEN_RX_VCID, 0);
> +
> + div = DIV_ROUND_UP(byte_clk, dsi->slave->lp_rate);
> + writel(div, ctx->base + TX_ESC_CLK_CONFIG);
> +
> + max_rd_time = ns_to_cycle(ctx->max_rd_time, byte_clk);
> + writel(max_rd_time, ctx->base + MAX_READ_TIME);
> +
> + data_hs2lp = ns_to_cycle(ctx->data_hs2lp, byte_clk);
> + data_lp2hs = ns_to_cycle(ctx->data_lp2hs, byte_clk);
> + clk_hs2lp = ns_to_cycle(ctx->clk_hs2lp, byte_clk);
> + clk_lp2hs = ns_to_cycle(ctx->clk_lp2hs, byte_clk);
> + dsi_reg_wr(ctx, PHY_DATALANE_TIME_CONFIG,
> + PHY_DATALANE_HS_TO_LP_TIME, 16, data_hs2lp);
> + dsi_reg_wr(ctx, PHY_DATALANE_TIME_CONFIG,
> + PHY_DATALANE_LP_TO_HS_TIME, 0, data_lp2hs);
> + dsi_reg_wr(ctx, PHY_CLKLANE_TIME_CONFIG,
> + PHY_CLKLANE_HS_TO_LP_TIME, 16, clk_hs2lp);
> + dsi_reg_wr(ctx, PHY_CLKLANE_TIME_CONFIG,
> + PHY_CLKLANE_LP_TO_HS_TIME, 0, clk_lp2hs);
> +
> + writel(1, ctx->base + SOFT_RESET);
> +}
> +
> +/*
> + * Free up resources and shutdown host controller and PHY
> + */
> +static void sprd_dsi_fini(struct dsi_context *ctx)
> +{
> + writel(0xffffffff, ctx->base + MASK_PROTOCOL_INT);
> + writel(0xffffffff, ctx->base + MASK_INTERNAL_INT);
> + writel(0, ctx->base + SOFT_RESET);
> +}
> +
> +/*
> + * If not in burst mode, it will compute the video and null packet sizes
> + * according to necessity.
> + * Configure timers for data lanes and/or clock lane to return to LP when
> + * bandwidth is not filled by data.
> + */
> +static int sprd_dsi_dpi_video(struct dsi_context *ctx)
> +{
> + struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
> + struct videomode *vm = &ctx->vm;
> + u32 byte_clk = dsi->slave->hs_rate / 8;
> + u16 bpp_x100;
> + u16 video_size;
> + u32 ratio_x1000;
> + u16 null_pkt_size = 0;
> + u8 video_size_step;
> + u32 hs_to;
> + u32 total_bytes;
> + u32 bytes_per_chunk;
> + u32 chunks = 0;
> + u32 bytes_left = 0;
> + u32 chunk_overhead;
> + const u8 pkt_header = 6;
> + u8 coding;
> + int div;
> + u16 hline;
> + u16 byte_cycle;
> +
> + coding = fmt_to_coding(dsi->slave->format);
> + video_size = round_video_size(coding, vm->hactive);
> + bpp_x100 = calc_bytes_per_pixel_x100(coding);
> + video_size_step = calc_video_size_step(coding);
> + ratio_x1000 = byte_clk * 1000 / (vm->pixelclock / 1000);
> + hline = vm->hactive + vm->hsync_len + vm->hfront_porch +
> + vm->hback_porch;
> +
> + writel(0, ctx->base + SOFT_RESET);
> + dsi_reg_wr(ctx, VID_MODE_CFG, FRAME_BTA_ACK_EN, 15, ctx->frame_ack_en);
> + dsi_reg_wr(ctx, DPI_VIDEO_FORMAT, DPI_VIDEO_MODE_FORMAT, 0, coding);
> + dsi_reg_wr(ctx, VID_MODE_CFG, VID_MODE_TYPE, 0, ctx->burst_mode);
> + byte_cycle = 95 * hline * ratio_x1000 / 100000;
> + dsi_reg_wr(ctx, VIDEO_SIG_DELAY_CONFIG, VIDEO_SIG_DELAY, 0, byte_cycle);
> + byte_cycle = hline * ratio_x1000 / 1000;
> + writel(byte_cycle, ctx->base + VIDEO_LINE_TIME);
> + byte_cycle = vm->hsync_len * ratio_x1000 / 1000;
> + dsi_reg_wr(ctx, VIDEO_LINE_HBLK_TIME, VIDEO_LINE_HSA_TIME, 16, byte_cycle);
> + byte_cycle = vm->hback_porch * ratio_x1000 / 1000;
> + dsi_reg_wr(ctx, VIDEO_LINE_HBLK_TIME, VIDEO_LINE_HBP_TIME, 0, byte_cycle);
> + writel(vm->vactive, ctx->base + VIDEO_VACTIVE_LINES);
> + dsi_reg_wr(ctx, VIDEO_VBLK_LINES, VFP_LINES, 0, vm->vfront_porch);
> + dsi_reg_wr(ctx, VIDEO_VBLK_LINES, VBP_LINES, 10, vm->vback_porch);
> + dsi_reg_wr(ctx, VIDEO_VBLK_LINES, VSA_LINES, 20, vm->vsync_len);
> + dsi_reg_up(ctx, VID_MODE_CFG, LP_HBP_EN | LP_HFP_EN | LP_VACT_EN |
> + LP_VFP_EN | LP_VBP_EN | LP_VSA_EN, LP_HBP_EN | LP_HFP_EN |
> + LP_VACT_EN | LP_VFP_EN | LP_VBP_EN | LP_VSA_EN);
> +
> + hs_to = (hline * vm->vactive) + (2 * bpp_x100) / 100;
> + for (div = 0x80; (div < hs_to) && (div > 2); div--) {
> + if ((hs_to % div) == 0) {
> + writel(div, ctx->base + TIMEOUT_CNT_CLK_CONFIG);
> + writel(hs_to / div, ctx->base + LRX_H_TO_CONFIG);
> + writel(hs_to / div, ctx->base + HTX_TO_CONFIG);
> + break;
> + }
> + }
> +
> + if (ctx->burst_mode == VIDEO_BURST_WITH_SYNC_PULSES) {
> + dsi_reg_wr(ctx, VIDEO_PKT_CONFIG, VIDEO_PKT_SIZE, 0, video_size);
> + writel(0, ctx->base + VIDEO_NULLPKT_SIZE);
> + dsi_reg_up(ctx, VIDEO_PKT_CONFIG, VIDEO_LINE_CHUNK_NUM, 0);
> + } else {
> + /* non burst transmission */
> + null_pkt_size = 0;
> +
> + /* bytes to be sent - first as one chunk */
> + bytes_per_chunk = vm->hactive * bpp_x100 / 100 + pkt_header;
> +
> + /* hline total bytes from the DPI interface */
> + total_bytes = (vm->hactive + vm->hfront_porch) *
> + ratio_x1000 / dsi->slave->lanes / 1000;
> +
> + /* check if the pixels actually fit on the DSI link */
> + if (total_bytes < bytes_per_chunk) {
> + drm_err(dsi->drm, "current resolution can not be set\n");
> + return -EINVAL;
> + }
> +
> + chunk_overhead = total_bytes - bytes_per_chunk;
> +
> + /* overhead higher than 1 -> enable multi packets */
> + if (chunk_overhead > 1) {
> + /* multi packets */
> + for (video_size = video_size_step;
> + video_size < vm->hactive;
> + video_size += video_size_step) {
> + if (vm->hactive * 1000 / video_size % 1000)
> + continue;
> +
> + chunks = vm->hactive / video_size;
> + bytes_per_chunk = bpp_x100 * video_size / 100
> + + pkt_header;
> + if (total_bytes >= (bytes_per_chunk * chunks)) {
> + bytes_left = total_bytes -
> + bytes_per_chunk * chunks;
> + break;
> + }
> + }
> +
> + /* prevent overflow (unsigned - unsigned) */
> + if (bytes_left > (pkt_header * chunks)) {
> + null_pkt_size = (bytes_left -
> + pkt_header * chunks) / chunks;
> + /* avoid register overflow */
> + if (null_pkt_size > 1023)
> + null_pkt_size = 1023;
> + }
> +
> + } else {
> + /* single packet */
> + chunks = 1;
> +
> + /* must be a multiple of 4 except 18 loosely */
> + for (video_size = vm->hactive;
> + (video_size % video_size_step) != 0;
> + video_size++)
> + ;
> + }
> +
> + dsi_reg_wr(ctx, VIDEO_PKT_CONFIG, VIDEO_PKT_SIZE, 0, video_size);
> + writel(null_pkt_size, ctx->base + VIDEO_NULLPKT_SIZE);
> + dsi_reg_wr(ctx, VIDEO_PKT_CONFIG, VIDEO_LINE_CHUNK_NUM, 16, chunks);
> + }
> +
> + writel(ctx->int0_mask, ctx->base + MASK_PROTOCOL_INT);
> + writel(ctx->int1_mask, ctx->base + MASK_INTERNAL_INT);
> + writel(1, ctx->base + SOFT_RESET);
> +
> + return 0;
> +}
> +
> +static void sprd_dsi_edpi_video(struct dsi_context *ctx)
> +{
> + struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
> + const u32 fifo_depth = 1096;
> + const u32 word_length = 4;
> + u32 hactive = ctx->vm.hactive;
> + u32 bpp_x100;
> + u32 max_fifo_len;
> + u8 coding;
> +
> + coding = fmt_to_coding(dsi->slave->format);
> + bpp_x100 = calc_bytes_per_pixel_x100(coding);
> + max_fifo_len = word_length * fifo_depth * 100 / bpp_x100;
> +
> + writel(0, ctx->base + SOFT_RESET);
> + dsi_reg_wr(ctx, DPI_VIDEO_FORMAT, DPI_VIDEO_MODE_FORMAT, 0, coding);
> + dsi_reg_wr(ctx, CMD_MODE_CFG, TEAR_FX_EN, 0, ctx->te_ack_en);
> +
> + if (max_fifo_len > hactive)
> + writel(hactive, ctx->base + DCS_WM_PKT_SIZE);
> + else
> + writel(max_fifo_len, ctx->base + DCS_WM_PKT_SIZE);
> +
> + writel(ctx->int0_mask, ctx->base + MASK_PROTOCOL_INT);
> + writel(ctx->int1_mask, ctx->base + MASK_INTERNAL_INT);
> + writel(1, ctx->base + SOFT_RESET);
> +}
> +
> +/*
> + * Send a packet on the generic interface,
> + * this function has an active delay to wait for the buffer to clear.
> + * The delay is limited to:
> + * (param_length / 4) x DSIH_FIFO_ACTIVE_WAIT x register access time
> + * the controller restricts the sending of.
> + *
> + * This function will not be able to send Null and Blanking packets due to
> + * controller restriction
> + */
> +static int sprd_dsi_wr_pkt(struct dsi_context *ctx, u8 vc, u8 type,
> + const u8 *param, u16 len)
> +{
> + struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
> + u8 wc_lsbyte, wc_msbyte;
> + u32 payload;
> + int i, j, ret;
> +
> + if (vc > 3)
> + return -EINVAL;
> +
> + /* 1st: for long packet, must config payload first */
> + ret = dsi_wait_tx_payload_fifo_empty(ctx);
> + if (ret) {
> + drm_err(dsi->drm, "tx payload fifo is not empty\n");
> + return ret;
> + }
> +
> + if (len > 2) {
> + for (i = 0, j = 0; i < len; i += j) {
> + payload = 0;
> + for (j = 0; (j < 4) && ((j + i) < (len)); j++)
> + payload |= param[i + j] << (j * 8);
> +
> + writel(payload, ctx->base + GEN_PLD_DATA);
> + }
> + wc_lsbyte = len & 0xff;
> + wc_msbyte = len >> 8;
> + } else {
> + wc_lsbyte = (len > 0) ? param[0] : 0;
> + wc_msbyte = (len > 1) ? param[1] : 0;
> + }
> +
> + /* 2nd: then set packet header */
> + ret = dsi_wait_tx_cmd_fifo_empty(ctx);
> + if (ret) {
> + drm_err(dsi->drm, "tx cmd fifo is not empty\n");
> + return ret;
> + }
> +
> + writel(type | (vc << 6) | (wc_lsbyte << 8) | (wc_msbyte << 16),
> + ctx->base + GEN_HDR);
> +
> + return 0;
> +}
> +
> +/*
> + * Send READ packet to peripheral using the generic interface,
> + * this will force command mode and stop video mode (because of BTA).
> + *
> + * This function has an active delay to wait for the buffer to clear,
> + * the delay is limited to 2 x DSIH_FIFO_ACTIVE_WAIT
> + * (waiting for command buffer, and waiting for receiving)
> + * @note this function will enable BTA
> + */
> +static int sprd_dsi_rd_pkt(struct dsi_context *ctx, u8 vc, u8 type,
> + u8 msb_byte, u8 lsb_byte,
> + u8 *buffer, u8 bytes_to_read)
> +{
> + struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
> + int i, ret;
> + int count = 0;
> + u32 temp;
> +
> + if (vc > 3)
> + return -EINVAL;
> +
> + /* 1st: send read command to peripheral */
> + ret = dsi_reg_rd(ctx, CMD_MODE_STATUS, GEN_CMD_CMD_FIFO_EMPTY, 5);
> + if (!ret)
> + return -EIO;
> +
> + writel(type | (vc << 6) | (lsb_byte << 8) | (msb_byte << 16),
> + ctx->base + GEN_HDR);
> +
> + /* 2nd: wait peripheral response completed */
> + ret = dsi_wait_rd_resp_completed(ctx);
> + if (ret) {
> + drm_err(dsi->drm, "wait read response time out\n");
> + return ret;
> + }
> +
> + /* 3rd: get data from rx payload fifo */
> + ret = dsi_reg_rd(ctx, CMD_MODE_STATUS, GEN_CMD_RDATA_FIFO_EMPTY, 1);
> + if (ret) {
> + drm_err(dsi->drm, "rx payload fifo empty\n");
> + return -EIO;
> + }
> +
> + for (i = 0; i < 100; i++) {
> + temp = readl(ctx->base + GEN_PLD_DATA);
> +
> + if (count < bytes_to_read)
> + buffer[count++] = temp & 0xff;
> + if (count < bytes_to_read)
> + buffer[count++] = (temp >> 8) & 0xff;
> + if (count < bytes_to_read)
> + buffer[count++] = (temp >> 16) & 0xff;
> + if (count < bytes_to_read)
> + buffer[count++] = (temp >> 24) & 0xff;
> +
> + ret = dsi_reg_rd(ctx, CMD_MODE_STATUS, GEN_CMD_RDATA_FIFO_EMPTY, 1);
> + if (ret)
> + return count;
> + }
> +
> + return 0;
> +}
> +
> +static void sprd_dsi_set_work_mode(struct dsi_context *ctx, u8 mode)
> +{
> + if (mode == DSI_MODE_CMD)
> + writel(1, ctx->base + DSI_MODE_CFG);
> + else
> + writel(0, ctx->base + DSI_MODE_CFG);
> +}
> +
> +static void sprd_dsi_state_reset(struct dsi_context *ctx)
> +{
> + writel(0, ctx->base + SOFT_RESET);
> + udelay(100);
> + writel(1, ctx->base + SOFT_RESET);
> +}
> +
> +static int sprd_dphy_init(struct dsi_context *ctx)
> +{
> + struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
> + int ret;
> +
> + dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_RESET_N, 0);
> + dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_SHUTDOWN, 0);
> + dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_CLK_EN, 0);
> +
> + dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLR, 0);
> + dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLR, PHY_TESTCLR);
> + dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLR, 0);
> +
> + dphy_pll_config(ctx);
> + dphy_timing_config(ctx);
> +
> + dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_SHUTDOWN, RF_PHY_SHUTDOWN);
> + dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_RESET_N, RF_PHY_RESET_N);
> + writel(0x1C, ctx->base + PHY_MIN_STOP_TIME);
> + dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_CLK_EN, RF_PHY_CLK_EN);
> + writel(dsi->slave->lanes - 1, ctx->base + PHY_LANE_NUM_CONFIG);
> +
> + ret = dphy_wait_pll_locked(ctx);
> + if (ret) {
> + drm_err(dsi->drm, "dphy initial failed\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static void sprd_dphy_fini(struct dsi_context *ctx)
> +{
> + dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_RESET_N, 0);
> + dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_SHUTDOWN, 0);
> + dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_RESET_N, RF_PHY_RESET_N);
> +}
> +
> +static void sprd_dsi_encoder_mode_set(struct drm_encoder *encoder,
> + struct drm_display_mode *mode,
> + struct drm_display_mode *adj_mode)
> +{
> + struct sprd_dsi *dsi = encoder_to_dsi(encoder);
> +
> + drm_display_mode_to_videomode(adj_mode, &dsi->ctx.vm);
> +}
> +
> +static void sprd_dsi_encoder_enable(struct drm_encoder *encoder)
> +{
> + struct sprd_dsi *dsi = encoder_to_dsi(encoder);
> + struct sprd_dpu *dpu = to_sprd_crtc(encoder->crtc);
> + struct dsi_context *ctx = &dsi->ctx;
> +
> + if (ctx->enabled) {
> + drm_warn(dsi->drm, "dsi is initialized\n");
> + return;
> + }
> +
> + sprd_dsi_init(ctx);
> + if (ctx->work_mode == DSI_MODE_VIDEO)
> + sprd_dsi_dpi_video(ctx);
> + else
> + sprd_dsi_edpi_video(ctx);
> +
> + sprd_dphy_init(ctx);
> +
> + sprd_dsi_set_work_mode(ctx, ctx->work_mode);
> + sprd_dsi_state_reset(ctx);
> +
> + if (dsi->slave->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) {
> + dsi_reg_up(ctx, PHY_CLK_LANE_LP_CTRL, AUTO_CLKLANE_CTRL_EN,
> + AUTO_CLKLANE_CTRL_EN);
> + } else {
> + dsi_reg_up(ctx, PHY_CLK_LANE_LP_CTRL, RF_PHY_CLK_EN, RF_PHY_CLK_EN);
> + dsi_reg_up(ctx, PHY_CLK_LANE_LP_CTRL, PHY_CLKLANE_TX_REQ_HS,
> + PHY_CLKLANE_TX_REQ_HS);
> + dphy_wait_pll_locked(ctx);
> + }
> +
> + sprd_dpu_run(dpu);
> +
> + ctx->enabled = true;
> +}
> +
> +static void sprd_dsi_encoder_disable(struct drm_encoder *encoder)
> +{
> + struct sprd_dsi *dsi = encoder_to_dsi(encoder);
> + struct sprd_dpu *dpu = to_sprd_crtc(encoder->crtc);
> + struct dsi_context *ctx = &dsi->ctx;
> +
> + if (!ctx->enabled) {
> + drm_warn(dsi->drm, "dsi isn't initialized\n");
> + return;
> + }
> +
> + sprd_dpu_stop(dpu);
> + sprd_dphy_fini(ctx);
> + sprd_dsi_fini(ctx);
> +
> + ctx->enabled = false;
> +}
> +
> +static const struct drm_encoder_helper_funcs sprd_encoder_helper_funcs = {
> + .mode_set = sprd_dsi_encoder_mode_set,
> + .enable = sprd_dsi_encoder_enable,
> + .disable = sprd_dsi_encoder_disable
> +};
> +
> +static const struct drm_encoder_funcs sprd_encoder_funcs = {
> + .destroy = drm_encoder_cleanup,
> +};
> +
> +static int sprd_dsi_encoder_init(struct sprd_dsi *dsi,
> + struct device *dev)
> +{
> + struct drm_encoder *encoder = &dsi->encoder;
> + u32 crtc_mask;
> + int ret;
> +
> + crtc_mask = drm_of_find_possible_crtcs(dsi->drm, dev->of_node);
> + if (!crtc_mask) {
> + drm_err(dsi->drm, "failed to find crtc mask\n");
> + return -EINVAL;
> + }
> +
> + drm_dbg(dsi->drm, "find possible crtcs: 0x%08x\n", crtc_mask);
> +
> + encoder->possible_crtcs = crtc_mask;
> + ret = drm_encoder_init(dsi->drm, encoder, &sprd_encoder_funcs,
> + DRM_MODE_ENCODER_DSI, NULL);
> + if (ret) {
> + drm_err(dsi->drm, "failed to init dsi encoder\n");
> + return ret;
> + }
> +
> + drm_encoder_helper_add(encoder, &sprd_encoder_helper_funcs);
> +
> + return 0;
> +}
> +
> +static int sprd_dsi_bridge_init(struct sprd_dsi *dsi,
> + struct device *dev)
> +{
> + int ret;
> +
> + dsi->panel_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
> + if (IS_ERR(dsi->panel_bridge))
> + return PTR_ERR(dsi->panel_bridge);
> +
> + ret = drm_bridge_attach(&dsi->encoder, dsi->panel_bridge, NULL, 0);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int sprd_dsi_context_init(struct sprd_dsi *dsi,
> + struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct dsi_context *ctx = &dsi->ctx;
> + struct resource *res;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + ctx->base = devm_ioremap(dev, res->start, resource_size(res));
> + if (!ctx->base) {
> + drm_err(dsi->drm, "failed to map dsi host registers\n");
> + return -ENXIO;
> + }
> +
> + ctx->regmap = devm_regmap_init(dev, ®map_tst_io, dsi, &byte_config);
> + if (IS_ERR(ctx->regmap)) {
> + drm_err(dsi->drm, "dphy regmap init failed\n");
> + return PTR_ERR(ctx->regmap);
> + }
> +
> + ctx->data_hs2lp = 120;
> + ctx->data_lp2hs = 500;
> + ctx->clk_hs2lp = 4;
> + ctx->clk_lp2hs = 15;
> + ctx->max_rd_time = 6000;
> + ctx->int0_mask = 0xffffffff;
> + ctx->int1_mask = 0xffffffff;
> + ctx->enabled = true;
> +
> + return 0;
> +}
> +
> +static int sprd_dsi_bind(struct device *dev, struct device *master, void *data)
> +{
> + struct drm_device *drm = data;
> + struct sprd_dsi *dsi = dev_get_drvdata(dev);
> + int ret;
> +
> + dsi->drm = drm;
> +
> + ret = sprd_dsi_encoder_init(dsi, dev);
> + if (ret)
> + return ret;
> +
> + ret = sprd_dsi_bridge_init(dsi, dev);
> + if (ret)
> + return ret;
> +
> + ret = sprd_dsi_context_init(dsi, dev);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static void sprd_dsi_unbind(struct device *dev,
> + struct device *master, void *data)
> +{
> + struct sprd_dsi *dsi = dev_get_drvdata(dev);
> +
> + drm_of_panel_bridge_remove(dev->of_node, 1, 0);
> +
> + drm_encoder_cleanup(&dsi->encoder);
> +}
> +
> +static const struct component_ops dsi_component_ops = {
> + .bind = sprd_dsi_bind,
> + .unbind = sprd_dsi_unbind,
> +};
> +
> +static int sprd_dsi_host_attach(struct mipi_dsi_host *host,
> + struct mipi_dsi_device *slave)
> +{
> + struct sprd_dsi *dsi = host_to_dsi(host);
> + struct dsi_context *ctx = &dsi->ctx;
> +
> + dsi->slave = slave;
> +
> + if (slave->mode_flags & MIPI_DSI_MODE_VIDEO)
> + ctx->work_mode = DSI_MODE_VIDEO;
> + else
> + ctx->work_mode = DSI_MODE_CMD;
> +
> + if (slave->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
> + ctx->burst_mode = VIDEO_BURST_WITH_SYNC_PULSES;
> + else if (slave->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
> + ctx->burst_mode = VIDEO_NON_BURST_WITH_SYNC_PULSES;
> + else
> + ctx->burst_mode = VIDEO_NON_BURST_WITH_SYNC_EVENTS;
> +
> + return component_add(host->dev, &dsi_component_ops);
> +}
> +
> +static int sprd_dsi_host_detach(struct mipi_dsi_host *host,
> + struct mipi_dsi_device *slave)
> +{
> + component_del(host->dev, &dsi_component_ops);
> +
> + return 0;
> +}
> +
> +static ssize_t sprd_dsi_host_transfer(struct mipi_dsi_host *host,
> + const struct mipi_dsi_msg *msg)
> +{
> + struct sprd_dsi *dsi = host_to_dsi(host);
> + const u8 *tx_buf = msg->tx_buf;
> +
> + if (msg->rx_buf && msg->rx_len) {
> + u8 lsb = (msg->tx_len > 0) ? tx_buf[0] : 0;
> + u8 msb = (msg->tx_len > 1) ? tx_buf[1] : 0;
> +
> + return sprd_dsi_rd_pkt(&dsi->ctx, msg->channel, msg->type,
> + msb, lsb, msg->rx_buf, msg->rx_len);
> + }
> +
> + if (msg->tx_buf && msg->tx_len)
> + return sprd_dsi_wr_pkt(&dsi->ctx, msg->channel, msg->type,
> + tx_buf, msg->tx_len);
> +
> + return 0;
> +}
> +
> +static const struct mipi_dsi_host_ops sprd_dsi_host_ops = {
> + .attach = sprd_dsi_host_attach,
> + .detach = sprd_dsi_host_detach,
> + .transfer = sprd_dsi_host_transfer,
> +};
> +
> +static const struct of_device_id dsi_match_table[] = {
> + { .compatible = "sprd,sharkl3-dsi-host" },
> + { /* sentinel */ },
> +};
> +
> +static int sprd_dsi_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct sprd_dsi *dsi;
> +
> + dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
> + if (!dsi)
> + return -ENOMEM;
> +
> + dev_set_drvdata(dev, dsi);
> +
> + dsi->host.ops = &sprd_dsi_host_ops;
> + dsi->host.dev = dev;
> +
> + return mipi_dsi_host_register(&dsi->host);
> +}
> +
> +static int sprd_dsi_remove(struct platform_device *pdev)
> +{
> + struct sprd_dsi *dsi = dev_get_drvdata(&pdev->dev);
> +
> + mipi_dsi_host_unregister(&dsi->host);
> +
> + return 0;
> +}
> +
> +struct platform_driver sprd_dsi_driver = {
> + .probe = sprd_dsi_probe,
> + .remove = sprd_dsi_remove,
> + .driver = {
> + .name = "sprd-dsi-drv",
> + .of_match_table = dsi_match_table,
> + },
> +};
> +
> +MODULE_AUTHOR("Leon He <leon.he@...soc.com>");
> +MODULE_AUTHOR("Kevin Tang <kevin.tang@...soc.com>");
> +MODULE_DESCRIPTION("Unisoc MIPI DSI HOST Controller Driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/sprd/sprd_dsi.h b/drivers/gpu/drm/sprd/sprd_dsi.h
> new file mode 100644
> index 000000000..d858ebb11
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/sprd_dsi.h
> @@ -0,0 +1,126 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020 Unisoc Inc.
> + */
> +
> +#ifndef __SPRD_DSI_H__
> +#define __SPRD_DSI_H__
> +
> +#include <linux/of.h>
> +#include <linux/device.h>
> +#include <linux/regmap.h>
> +#include <video/videomode.h>
> +
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_connector.h>
> +#include <drm/drm_encoder.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_print.h>
> +#include <drm/drm_panel.h>
> +
> +#define encoder_to_dsi(encoder) \
> + container_of(encoder, struct sprd_dsi, encoder)
> +
> +enum dsi_work_mode {
> + DSI_MODE_CMD = 0,
> + DSI_MODE_VIDEO
> +};
> +
> +enum video_burst_mode {
> + VIDEO_NON_BURST_WITH_SYNC_PULSES = 0,
> + VIDEO_NON_BURST_WITH_SYNC_EVENTS,
> + VIDEO_BURST_WITH_SYNC_PULSES
> +};
> +
> +enum dsi_color_coding {
> + COLOR_CODE_16BIT_CONFIG1 = 0,
> + COLOR_CODE_16BIT_CONFIG2,
> + COLOR_CODE_16BIT_CONFIG3,
> + COLOR_CODE_18BIT_CONFIG1,
> + COLOR_CODE_18BIT_CONFIG2,
> + COLOR_CODE_24BIT,
> + COLOR_CODE_20BIT_YCC422_LOOSELY,
> + COLOR_CODE_24BIT_YCC422,
> + COLOR_CODE_16BIT_YCC422,
> + COLOR_CODE_30BIT,
> + COLOR_CODE_36BIT,
> + COLOR_CODE_12BIT_YCC420,
> + COLOR_CODE_COMPRESSTION,
> + COLOR_CODE_MAX
> +};
> +
> +enum pll_timing {
> + NONE,
> + REQUEST_TIME,
> + PREPARE_TIME,
> + SETTLE_TIME,
> + ZERO_TIME,
> + TRAIL_TIME,
> + EXIT_TIME,
> + CLKPOST_TIME,
> + TA_GET,
> + TA_GO,
> + TA_SURE,
> + TA_WAIT,
> +};
> +
> +struct dphy_pll {
> + u8 refin; /* Pre-divider control signal */
> + u8 cp_s; /* 00: SDM_EN=1, 10: SDM_EN=0 */
> + u8 fdk_s; /* PLL mode control: integer or fraction */
> + u8 sdm_en;
> + u8 div;
> + u8 int_n; /* integer N PLL */
> + u32 ref_clk; /* dphy reference clock, unit: MHz */
> + u32 freq; /* panel config, unit: KHz */
> + u32 fvco;
> + u32 potential_fvco;
> + u32 nint; /* sigma delta modulator NINT control */
> + u32 kint; /* sigma delta modulator KINT control */
> + u8 lpf_sel; /* low pass filter control */
> + u8 out_sel; /* post divider control */
> + u8 vco_band; /* vco range */
> + u8 det_delay;
> +};
> +
> +struct dsi_context {
> + void __iomem *base;
> + struct regmap *regmap;
> + struct dphy_pll pll;
> + struct videomode vm;
> + bool enabled;
> +
> + u8 work_mode;
> + u8 burst_mode;
> + u32 int0_mask;
> + u32 int1_mask;
> +
> + /* maximum time (ns) for data lanes from HS to LP */
> + u16 data_hs2lp;
> + /* maximum time (ns) for data lanes from LP to HS */
> + u16 data_lp2hs;
> + /* maximum time (ns) for clk lanes from HS to LP */
> + u16 clk_hs2lp;
> + /* maximum time (ns) for clk lanes from LP to HS */
> + u16 clk_lp2hs;
> + /* maximum time (ns) for BTA operation - REQUIRED */
> + u16 max_rd_time;
> + /* enable receiving frame ack packets - for video mode */
> + bool frame_ack_en;
> + /* enable receiving tear effect ack packets - for cmd mode */
> + bool te_ack_en;
> +};
> +
> +struct sprd_dsi {
> + struct drm_device *drm;
> + struct mipi_dsi_host host;
> + struct mipi_dsi_device *slave;
> + struct drm_encoder encoder;
> + struct drm_bridge *panel_bridge;
> + struct dsi_context ctx;
> +};
> +
> +int dphy_pll_config(struct dsi_context *ctx);
> +void dphy_timing_config(struct dsi_context *ctx);
> +
> +#endif /* __SPRD_DSI_H__ */
Thanks, pushed this version after casual compile testing!
~Maarten
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