Message-ID: <20231025103957.3776-5-keith.zhao@starfivetech.com>
Date:   Wed, 25 Oct 2023 18:39:55 +0800
From:   Keith Zhao <keith.zhao@...rfivetech.com>
To:     <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        <linux-media@...r.kernel.org>, <linaro-mm-sig@...ts.linaro.org>
CC:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        "Emil Renner Berthing" <kernel@...il.dk>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        <christian.koenig@....com>, Bjorn Andersson <andersson@...nel.org>,
        "Heiko Stuebner" <heiko@...ech.de>,
        Shawn Guo <shawnguo@...nel.org>, Jagan Teki <jagan@...eble.ai>,
        Chris Morgan <macromorgan@...mail.com>,
        Keith Zhao <keith.zhao@...rfivetech.com>,
        Jack Zhu <jack.zhu@...rfivetech.com>,
        Shengyang Chen <shengyang.chen@...rfivetech.com>,
        Changhuang Liang <changhuang.liang@...rfivetech.com>
Subject: [PATCH v2 4/6] drm/vs: Register DRM device

Implement drm device registration interface

Thomas Zimmermann wrote:
You are replacing almost all of the GEM DMA object's helper code.
Either inherit directly from drm_gem_object drop the dependency entirely,
or you could try to fit your code into GEM DMA as well

Eventually I found an answer and it was DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE
After I adapt this interface, the custom gem logic interfaces can be deleted.
It's a big shocking, clap!

Signed-off-by: Keith Zhao <keith.zhao@...rfivetech.com>
---
 drivers/gpu/drm/Kconfig                  |   2 +
 drivers/gpu/drm/Makefile                 |   1 +
 drivers/gpu/drm/verisilicon/Kconfig      |  15 ++
 drivers/gpu/drm/verisilicon/Makefile     |   7 +
 drivers/gpu/drm/verisilicon/vs_drv.c     | 227 +++++++++++++++++++++++
 drivers/gpu/drm/verisilicon/vs_drv.h     |  27 +++
 drivers/gpu/drm/verisilicon/vs_modeset.c |  36 ++++
 drivers/gpu/drm/verisilicon/vs_modeset.h |  10 +
 include/uapi/drm/vs_drm.h                |  50 +++++
 9 files changed, 375 insertions(+)
 create mode 100644 drivers/gpu/drm/verisilicon/Kconfig
 create mode 100644 drivers/gpu/drm/verisilicon/Makefile
 create mode 100644 drivers/gpu/drm/verisilicon/vs_drv.c
 create mode 100644 drivers/gpu/drm/verisilicon/vs_drv.h
 create mode 100644 drivers/gpu/drm/verisilicon/vs_modeset.c
 create mode 100644 drivers/gpu/drm/verisilicon/vs_modeset.h
 create mode 100644 include/uapi/drm/vs_drm.h

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index afb3b2f5f..9ede80ef9 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -363,6 +363,8 @@ source "drivers/gpu/drm/solomon/Kconfig"
 
 source "drivers/gpu/drm/sprd/Kconfig"
 
+source "drivers/gpu/drm/verisilicon/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 7a09a89b4..6db3bc397 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -194,3 +194,4 @@ obj-y			+= gud/
 obj-$(CONFIG_DRM_HYPERV) += hyperv/
 obj-y			+= solomon/
 obj-$(CONFIG_DRM_SPRD) += sprd/
+obj-$(CONFIG_DRM_VERISILICON) += verisilicon/
diff --git a/drivers/gpu/drm/verisilicon/Kconfig b/drivers/gpu/drm/verisilicon/Kconfig
new file mode 100644
index 000000000..3a361f8c8
--- /dev/null
+++ b/drivers/gpu/drm/verisilicon/Kconfig
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0
+config DRM_VERISILICON
+	tristate "DRM Support for VeriSilicon"
+	depends on DRM
+	select DRM_KMS_HELPER
+	select DRM_GEM_DMA_HELPER
+	select CMA
+	select DMA_CMA
+	help
+	  Choose this option if you have a VeriSilicon soc chipset.
+	  This driver provides VeriSilicon kernel mode
+	  setting and buffer management. It does not
+	  provide 2D or 3D acceleration.
+
+
diff --git a/drivers/gpu/drm/verisilicon/Makefile b/drivers/gpu/drm/verisilicon/Makefile
new file mode 100644
index 000000000..7d3be305b
--- /dev/null
+++ b/drivers/gpu/drm/verisilicon/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0
+
+vs_drm-objs := vs_drv.o \
+		vs_modeset.o 
+
+obj-$(CONFIG_DRM_VERISILICON) += vs_drm.o
+
diff --git a/drivers/gpu/drm/verisilicon/vs_drv.c b/drivers/gpu/drm/verisilicon/vs_drv.c
new file mode 100644
index 000000000..da7698c3d
--- /dev/null
+++ b/drivers/gpu/drm/verisilicon/vs_drv.c
@@ -0,0 +1,227 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
+ */
+
+#include <linux/component.h>
+#include <linux/pm_runtime.h>
+
+#include <drm/drm_aperture.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fbdev_generic.h>
+#include <drm/drm_file.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_module.h>
+#include <drm/drm_of.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+#include "vs_drv.h"
+#include "vs_modeset.h"
+
+#define DRV_NAME	"verisilicon"
+#define DRV_DESC	"Verisilicon DRM driver"
+#define DRV_DATE	"20230516"
+#define DRV_MAJOR	1
+#define DRV_MINOR	0
+
+static int vs_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
+			      struct drm_mode_create_dumb *args)
+{
+	struct vs_drm_device *priv = to_vs_drm_private(dev);
+
+	unsigned int pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
+
+	if (args->bpp % 10)
+		args->pitch = ALIGN(pitch, priv->pitch_alignment);
+	else
+		/* for costum 10bit format with no bit gaps */
+		args->pitch = pitch;
+
+	return drm_gem_dma_dumb_create_internal(file, dev, args);
+}
+
+DEFINE_DRM_GEM_FOPS(vs_drm_fops);
+
+static struct drm_driver vs_drm_driver = {
+	.driver_features	= DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
+
+	DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(vs_gem_dumb_create),
+
+	.fops			= &vs_drm_fops,
+	.name			= DRV_NAME,
+	.desc			= DRV_DESC,
+	.date			= DRV_DATE,
+	.major			= DRV_MAJOR,
+	.minor			= DRV_MINOR,
+};
+
+static int vs_drm_bind(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct vs_drm_device *priv;
+	int ret;
+	struct drm_device *drm_dev;
+
+	/* Remove existing drivers that may own the framebuffer memory. */
+	ret = drm_aperture_remove_framebuffers(&vs_drm_driver);
+	if (ret)
+		return ret;
+
+	priv = devm_drm_dev_alloc(dev, &vs_drm_driver, struct vs_drm_device, base);
+	if (IS_ERR(priv))
+		return PTR_ERR(priv);
+
+	priv->pitch_alignment = 64;
+
+	ret = dma_set_coherent_mask(priv->base.dev, DMA_BIT_MASK(40));
+	if (ret)
+		return ret;
+
+	drm_dev = &priv->base;
+	platform_set_drvdata(pdev, drm_dev);
+
+	vs_mode_config_init(drm_dev);
+
+	/* Now try and bind all our sub-components */
+	ret = component_bind_all(dev, drm_dev);
+	if (ret)
+		return ret;
+
+	ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(drm_dev);
+
+	drm_kms_helper_poll_init(drm_dev);
+
+	ret = drm_dev_register(drm_dev, 0);
+	if (ret)
+		return ret;
+
+	drm_fbdev_generic_setup(drm_dev, 32);
+
+	return 0;
+}
+
+static void vs_drm_unbind(struct device *dev)
+{
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
+
+	drm_dev_unregister(drm_dev);
+	drm_kms_helper_poll_fini(drm_dev);
+	component_unbind_all(drm_dev->dev, drm_dev);
+}
+
+static const struct component_master_ops vs_drm_ops = {
+	.bind = vs_drm_bind,
+	.unbind = vs_drm_unbind,
+};
+
+static struct platform_driver *drm_sub_drivers[] = {
+
+};
+
+static struct component_match *vs_drm_match_add(struct device *dev)
+{
+	struct component_match *match = NULL;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(drm_sub_drivers); ++i) {
+		struct platform_driver *drv = drm_sub_drivers[i];
+		struct device *p = NULL, *d;
+
+		while ((d = platform_find_device_by_driver(p, &drv->driver))) {
+			put_device(p);
+
+			component_match_add(dev, &match, component_compare_dev, d);
+			p = d;
+		}
+		put_device(p);
+	}
+
+	return match ? match : ERR_PTR(-ENODEV);
+}
+
+static int vs_drm_platform_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct component_match *match;
+
+	match = vs_drm_match_add(dev);
+	if (IS_ERR(match))
+		return PTR_ERR(match);
+
+	return component_master_add_with_match(dev, &vs_drm_ops, match);
+}
+
+static int vs_drm_platform_remove(struct platform_device *pdev)
+{
+	component_master_del(&pdev->dev, &vs_drm_ops);
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int vs_drm_suspend(struct device *dev)
+{
+	return drm_mode_config_helper_suspend(dev_get_drvdata(dev));
+}
+
+static int vs_drm_resume(struct device *dev)
+{
+	drm_mode_config_helper_resume(dev_get_drvdata(dev));
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(vs_drm_pm_ops, vs_drm_suspend, vs_drm_resume);
+
+static const struct of_device_id vs_drm_dt_ids[] = {
+	{ .compatible = "starfive,display-subsystem", },
+	{ },
+};
+
+MODULE_DEVICE_TABLE(of, vs_drm_dt_ids);
+
+static struct platform_driver vs_drm_platform_driver = {
+	.probe = vs_drm_platform_probe,
+	.remove = vs_drm_platform_remove,
+
+	.driver = {
+		.name = DRV_NAME,
+		.of_match_table = vs_drm_dt_ids,
+		.pm = &vs_drm_pm_ops,
+	},
+};
+
+static int __init vs_drm_init(void)
+{
+	int ret;
+
+	ret = platform_register_drivers(drm_sub_drivers, ARRAY_SIZE(drm_sub_drivers));
+	if (ret)
+		return ret;
+
+	ret = drm_platform_driver_register(&vs_drm_platform_driver);
+	if (ret)
+		platform_unregister_drivers(drm_sub_drivers, ARRAY_SIZE(drm_sub_drivers));
+
+	return ret;
+}
+
+static void __exit vs_drm_fini(void)
+{
+	platform_driver_unregister(&vs_drm_platform_driver);
+	platform_unregister_drivers(drm_sub_drivers, ARRAY_SIZE(drm_sub_drivers));
+}
+
+module_init(vs_drm_init);
+module_exit(vs_drm_fini);
+
+MODULE_DESCRIPTION("VeriSilicon DRM Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/verisilicon/vs_drv.h b/drivers/gpu/drm/verisilicon/vs_drv.h
new file mode 100644
index 000000000..369ad22d6
--- /dev/null
+++ b/drivers/gpu/drm/verisilicon/vs_drv.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
+ */
+
+#ifndef __VS_DRV_H__
+#define __VS_DRV_H__
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_gem.h>
+#include <drm/drm_managed.h>
+
+/*@...ch_alignment: buffer pitch alignment required by sub-devices.*/
+struct vs_drm_device {
+	struct drm_device base;
+	unsigned int pitch_alignment;
+};
+
+static inline struct vs_drm_device *
+to_vs_drm_private(const struct drm_device *dev)
+{
+	return container_of(dev, struct vs_drm_device, base);
+}
+
+#endif /* __VS_DRV_H__ */
diff --git a/drivers/gpu/drm/verisilicon/vs_modeset.c b/drivers/gpu/drm/verisilicon/vs_modeset.c
new file mode 100644
index 000000000..151272067
--- /dev/null
+++ b/drivers/gpu/drm/verisilicon/vs_modeset.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
+ */
+
+#include <linux/module.h>
+
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+
+#include "vs_modeset.h"
+
+static const struct drm_mode_config_funcs vs_mode_config_funcs = {
+	.fb_create			 = drm_gem_fb_create,
+	.atomic_check		 = drm_atomic_helper_check,
+	.atomic_commit		 = drm_atomic_helper_commit,
+};
+
+static struct drm_mode_config_helper_funcs vs_mode_config_helpers = {
+	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
+};
+
+void vs_mode_config_init(struct drm_device *dev)
+{
+	drm_mode_config_init(dev);
+	dev->mode_config.fb_modifiers_not_supported = false;
+
+	dev->mode_config.min_width  = 0;
+	dev->mode_config.min_height = 0;
+	dev->mode_config.max_width  = 4096;
+	dev->mode_config.max_height = 4096;
+
+	dev->mode_config.funcs = &vs_mode_config_funcs;
+	dev->mode_config.helper_private = &vs_mode_config_helpers;
+}
diff --git a/drivers/gpu/drm/verisilicon/vs_modeset.h b/drivers/gpu/drm/verisilicon/vs_modeset.h
new file mode 100644
index 000000000..ebfe6d612
--- /dev/null
+++ b/drivers/gpu/drm/verisilicon/vs_modeset.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 VeriSilicon Holdings Co., Ltd.
+ */
+
+#ifndef __VS_FB_H__
+#define __VS_FB_H__
+
+void vs_mode_config_init(struct drm_device *dev);
+#endif /* __VS_FB_H__ */
diff --git a/include/uapi/drm/vs_drm.h b/include/uapi/drm/vs_drm.h
new file mode 100644
index 000000000..96b7fc95d
--- /dev/null
+++ b/include/uapi/drm/vs_drm.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
+/*
+ * Copyright (C) 2020 VeriSilicon Holdings Co., Ltd.
+ */
+
+#ifndef __VS_DRM_H__
+#define __VS_DRM_H__
+
+#include "drm.h"
+
+enum drm_vs_degamma_mode {
+	VS_DEGAMMA_DISABLE = 0,
+	VS_DEGAMMA_BT709 = 1,
+	VS_DEGAMMA_BT2020 = 2,
+};
+
+enum drm_vs_sync_dc_mode {
+	VS_SINGLE_DC = 0,
+	VS_MULTI_DC_PRIMARY = 1,
+	VS_MULTI_DC_SECONDARY = 2,
+};
+
+enum drm_vs_mmu_prefetch_mode {
+	VS_MMU_PREFETCH_DISABLE = 0,
+	VS_MMU_PREFETCH_ENABLE = 1,
+};
+
+struct drm_vs_watermark {
+	__u32 watermark;
+	__u8 qos_low;
+	__u8 qos_high;
+};
+
+struct drm_vs_color_mgmt {
+	__u32 colorkey;
+	__u32 colorkey_high;
+	__u32 clear_value;
+	bool  clear_enable;
+	bool  transparency;
+};
+
+struct drm_vs_roi {
+	bool enable;
+	__u16 roi_x;
+	__u16 roi_y;
+	__u16 roi_w;
+	__u16 roi_h;
+};
+
+#endif /* __VS_DRM_H__ */
-- 
2.34.1

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