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Message-ID: <CAFPSGXagHcf6BGn8SmrxXZF-8o4i+aFw1gfswPC2ycvk_HMCsQ@mail.gmail.com>
Date: Fri, 3 Dec 2021 16:47:00 +0800
From: Kevin Tang <kevin3.tang@...il.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc: mripard@...nel.org, sean@...rly.run, airlied@...ux.ie,
daniel@...ll.ch, robh+dt@...nel.org, mark.rutland@....com,
pony1.wu@...il.com, orsonzhai@...il.com, zhang.lyra@...il.com,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v7 2/6] drm/sprd: add Unisoc's drm kms master
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com> 于2021年11月26日周五 22:03写道：
>
> On 25-10-2021 11:34, Kevin Tang wrote:
> > Adds drm support for the Unisoc's display subsystem.
> >
> > This is drm kms driver, this driver provides support for the
> > application framework in Android, Yocto and more.
> >
> > Application framework can access Unisoc's display internal
> > peripherals through libdrm or libkms, it's test ok by modetest
> > (DRM/KMS test tool) and Android HWComposer.
> >
> > Cc: Orson Zhai <orsonzhai@...il.com>
> > Cc: Chunyan Zhang <zhang.lyra@...il.com>
> > Signed-off-by: Kevin Tang <kevin.tang@...soc.com>
> >
> > v4:
> > - Move the devm_drm_dev_alloc to master_ops->bind function.
> > - The managed drmm_mode_config_init() it is no longer necessary for drivers to explicitly call drm_mode_config_cleanup, so delete it.
> >
> > v5:
> > - Remove subdir-ccflgas-y for Makefile.
> > - Keep the selects sorted by alphabet for Kconfig.
> > ---
> > drivers/gpu/drm/Kconfig | 2 +
> > drivers/gpu/drm/Makefile | 1 +
> > drivers/gpu/drm/sprd/Kconfig | 11 ++
> > drivers/gpu/drm/sprd/Makefile | 3 +
> > drivers/gpu/drm/sprd/sprd_drm.c | 203 ++++++++++++++++++++++++++++++++
> > drivers/gpu/drm/sprd/sprd_drm.h | 16 +++
> > 6 files changed, 236 insertions(+)
> > create mode 100644 drivers/gpu/drm/sprd/Kconfig
> > create mode 100644 drivers/gpu/drm/sprd/Makefile
> > create mode 100644 drivers/gpu/drm/sprd/sprd_drm.c
> > create mode 100644 drivers/gpu/drm/sprd/sprd_drm.h
> >
> > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> > index 2a926d0de..8220be1b5 100644
> > --- a/drivers/gpu/drm/Kconfig
> > +++ b/drivers/gpu/drm/Kconfig
> > @@ -380,6 +380,8 @@ source "drivers/gpu/drm/xlnx/Kconfig"
> >
> > source "drivers/gpu/drm/gud/Kconfig"
> >
> > +source "drivers/gpu/drm/sprd/Kconfig"
> > +
> > config DRM_HYPERV
> > tristate "DRM Support for Hyper-V synthetic video device"
> > depends on DRM && PCI && MMU && HYPERV
> > diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> > index 0dff40bb8..ec2756806 100644
> > --- a/drivers/gpu/drm/Makefile
> > +++ b/drivers/gpu/drm/Makefile
> > @@ -127,3 +127,4 @@ obj-$(CONFIG_DRM_TIDSS) += tidss/
> > obj-y += xlnx/
> > obj-y += gud/
> > obj-$(CONFIG_DRM_HYPERV) += hyperv/
> > +obj-$(CONFIG_DRM_SPRD) += sprd/
> > diff --git a/drivers/gpu/drm/sprd/Kconfig b/drivers/gpu/drm/sprd/Kconfig
> > new file mode 100644
> > index 000000000..726c3e76d
> > --- /dev/null
> > +++ b/drivers/gpu/drm/sprd/Kconfig
> > @@ -0,0 +1,11 @@
> > +config DRM_SPRD
> > + tristate "DRM Support for Unisoc SoCs Platform"
> > + depends on ARCH_SPRD || COMPILE_TEST
> > + depends on DRM && OF
> > + select DRM_GEM_CMA_HELPER
> > + select DRM_KMS_CMA_HELPER
> > + select DRM_KMS_HELPER
> > + help
> > + Choose this option if you have a Unisoc chipset.
> > + If M is selected the module will be called sprd_drm.
> > +
> > diff --git a/drivers/gpu/drm/sprd/Makefile b/drivers/gpu/drm/sprd/Makefile
> > new file mode 100644
> > index 000000000..9850f00b8
> > --- /dev/null
> > +++ b/drivers/gpu/drm/sprd/Makefile
> > @@ -0,0 +1,3 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +
> > +obj-y := sprd_drm.o
> > diff --git a/drivers/gpu/drm/sprd/sprd_drm.c b/drivers/gpu/drm/sprd/sprd_drm.c
> > new file mode 100644
> > index 000000000..bb87f28f2
> > --- /dev/null
> > +++ b/drivers/gpu/drm/sprd/sprd_drm.c
> > @@ -0,0 +1,203 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020 Unisoc Inc.
> > + */
> > +
> > +#include <linux/component.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/module.h>
> > +#include <linux/mutex.h>
> > +#include <linux/of_graph.h>
> > +#include <linux/of_platform.h>
> > +
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_crtc_helper.h>
> > +#include <drm/drm_drv.h>
> > +#include <drm/drm_gem_cma_helper.h>
> > +#include <drm/drm_gem_framebuffer_helper.h>
> > +#include <drm/drm_of.h>
> > +#include <drm/drm_probe_helper.h>
> > +#include <drm/drm_vblank.h>
> > +
> > +#include "sprd_drm.h"
> > +
> > +#define DRIVER_NAME "sprd"
> > +#define DRIVER_DESC "Spreadtrum SoCs' DRM Driver"
> > +#define DRIVER_DATE "20200201"
> > +#define DRIVER_MAJOR 1
> > +#define DRIVER_MINOR 0
> > +
> > +static const struct drm_mode_config_helper_funcs sprd_drm_mode_config_helper = {
> > + .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
> > +};
> > +
> > +static const struct drm_mode_config_funcs sprd_drm_mode_config_funcs = {
> > + .fb_create = drm_gem_fb_create,
> > + .atomic_check = drm_atomic_helper_check,
> > + .atomic_commit = drm_atomic_helper_commit,
> > +};
> > +
> > +static void sprd_drm_mode_config_init(struct drm_device *drm)
> > +{
> > + drm->mode_config.min_width = 0;
> > + drm->mode_config.min_height = 0;
> > + drm->mode_config.max_width = 8192;
> > + drm->mode_config.max_height = 8192;
> > + drm->mode_config.allow_fb_modifiers = true;
> > +
> > + drm->mode_config.funcs = &sprd_drm_mode_config_funcs;
> > + drm->mode_config.helper_private = &sprd_drm_mode_config_helper;
> > +}
> > +
> > +DEFINE_DRM_GEM_CMA_FOPS(sprd_drm_fops);
> > +
> > +static struct drm_driver sprd_drm_drv = {
> > + .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
> > + .fops = &sprd_drm_fops,
> > +
> > + /* GEM Operations */
> > + DRM_GEM_CMA_DRIVER_OPS,
> > +
> > + .name = DRIVER_NAME,
> > + .desc = DRIVER_DESC,
> > + .date = DRIVER_DATE,
> > + .major = DRIVER_MAJOR,
> > + .minor = DRIVER_MINOR,
> > +};
> > +
> > +static int sprd_drm_bind(struct device *dev)
> > +{
> > + struct platform_device *pdev = to_platform_device(dev);
> > + struct drm_device *drm;
> > + struct sprd_drm *sprd;
> > + int ret;
> > +
> > + sprd = devm_drm_dev_alloc(dev, &sprd_drm_drv, struct sprd_drm, drm);
> > + if (IS_ERR(sprd))
> > + return PTR_ERR(sprd);
> > +
> > + drm = &sprd->drm;
> > + platform_set_drvdata(pdev, drm);
> > +
> > + ret = drmm_mode_config_init(drm);
> > + if (ret)
> > + return ret;
> > +
> > + sprd_drm_mode_config_init(drm);
> > +
> > + /* bind and init sub drivers */
> > + ret = component_bind_all(drm->dev, drm);
> > + if (ret) {
> > + drm_err(drm, "failed to bind all component.\n");
> > + return ret;
> > + }
> > +
> > + /* vblank init */
> > + ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
> > + if (ret) {
> > + drm_err(drm, "failed to initialize vblank.\n");
> > + goto err_unbind_all;
> > + }
> > +
> > + /* reset all the states of crtc/plane/encoder/connector */
> > + drm_mode_config_reset(drm);
> > +
> > + /* init kms poll for handling hpd */
> > + drm_kms_helper_poll_init(drm);
> > +
> > + ret = drm_dev_register(drm, 0);
> > + if (ret < 0)
> > + goto err_kms_helper_poll_fini;
> > +
> > + return 0;
> > +
> > +err_kms_helper_poll_fini:
> > + drm_kms_helper_poll_fini(drm);
> > +err_unbind_all:
> > + component_unbind_all(drm->dev, drm);
> > + return ret;
> > +}
> > +
> > +static void sprd_drm_unbind(struct device *dev)
> > +{
> > + struct drm_device *drm = dev_get_drvdata(dev);
> > +
> > + drm_dev_unregister(drm);
> > +
> > + drm_kms_helper_poll_fini(drm);
> > +
> > + component_unbind_all(drm->dev, drm);
> > +}
> > +
> > +static const struct component_master_ops drm_component_ops = {
> > + .bind = sprd_drm_bind,
> > + .unbind = sprd_drm_unbind,
> > +};
> > +
> > +static int compare_of(struct device *dev, void *data)
> > +{
> > + return dev->of_node == data;
> > +}
> > +
> > +static int sprd_drm_probe(struct platform_device *pdev)
> > +{
> > + return drm_of_component_probe(&pdev->dev, compare_of, &drm_component_ops);
> > +}
> > +
> > +static int sprd_drm_remove(struct platform_device *pdev)
> > +{
> > + component_master_del(&pdev->dev, &drm_component_ops);
> > + return 0;
> > +}
> > +
> > +static void sprd_drm_shutdown(struct platform_device *pdev)
> > +{
> > + struct drm_device *drm = platform_get_drvdata(pdev);
> > +
> > + if (!drm) {
> > + drm_warn(drm, "drm device is not available, no shutdown\n");
> > + return;
> > + }
> > +
> > + drm_atomic_helper_shutdown(drm);
> > +}
> > +
> > +static const struct of_device_id drm_match_table[] = {
> > + { .compatible = "sprd,display-subsystem", },
> > + { /* sentinel */ },
> > +};
> > +MODULE_DEVICE_TABLE(of, drm_match_table);
> > +
> > +static struct platform_driver sprd_drm_driver = {
> > + .probe = sprd_drm_probe,
> > + .remove = sprd_drm_remove,
> > + .shutdown = sprd_drm_shutdown,
> > + .driver = {
> > + .name = "sprd-drm-drv",
> > + .of_match_table = drm_match_table,
> > + },
> > +};
> > +
> > +static struct platform_driver *sprd_drm_drivers[] = {
> > + &sprd_drm_driver,
> > +};
> > +
> > +static int __init sprd_drm_init(void)
> > +{
> > + return platform_register_drivers(sprd_drm_drivers,
> > + ARRAY_SIZE(sprd_drm_drivers));
> > +}
> > +
> > +static void __exit sprd_drm_exit(void)
> > +{
> > + platform_unregister_drivers(sprd_drm_drivers,
> > + ARRAY_SIZE(sprd_drm_drivers));
> > +}
> > +
> > +module_init(sprd_drm_init);
> > +module_exit(sprd_drm_exit);
> > +
> > +MODULE_AUTHOR("Leon He <leon.he@...soc.com>");
> > +MODULE_AUTHOR("Kevin Tang <kevin.tang@...soc.com>");
> > +MODULE_DESCRIPTION("Unisoc DRM KMS Master Driver");
> > +MODULE_LICENSE("GPL v2");
> > diff --git a/drivers/gpu/drm/sprd/sprd_drm.h b/drivers/gpu/drm/sprd/sprd_drm.h
> > new file mode 100644
> > index 000000000..9781fd591
> > --- /dev/null
> > +++ b/drivers/gpu/drm/sprd/sprd_drm.h
> > @@ -0,0 +1,16 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020 Unisoc Inc.
> > + */
> > +
> > +#ifndef _SPRD_DRM_H_
> > +#define _SPRD_DRM_H_
> > +
> > +#include <drm/drm_atomic.h>
> > +#include <drm/drm_print.h>
> > +
> > +struct sprd_drm {
> > + struct drm_device drm;
> > +};
>
> I've seen this in the patch adding sprd_plane too, are you planning to extend both structs?
>
> ~Maarten
>
Hi Maarten,
Yes, after the basic version is merged, we will continue to expand
these two structures
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