Subject: [PATCH 6/6] drm/rockchip: Convert to use generic fbdev emulation

From: Rob Herring <[email-masked]>
Date: Mon, 21 Oct 2019 16:45:50 -0500

Now that we have the DRM_MODE_DUMB_KERNEL_MAP flag to indicate whether
or not a kernel mapping is required, the Rockchip driver can be
converted to using the generic fbdev emulation.

This patch makes full use of the generic fbdev emulation by using its
drm_client callbacks. This means that
drm_mode_config_funcs->output_poll_changed and drm_driver->lastclose are
now handled by the emulation code. Additionally fbdev unregister happens
automatically on drm_dev_unregister().

The drm_fbdev_generic_setup() call is put after drm_dev_register() in the
driver. This is done to highlight the fact that fbdev emulation is an
internal client that makes use of the driver, it is not part of the
driver as such. If fbdev setup fails, an error is printed, but the driver
succeeds probing.

Cc: Noralf Trønnes <[email-masked]>
Cc: Sandy Huang <[email-masked]>
Cc: "Heiko Stübner" <[email-masked]>
Cc: David Airlie <[email-masked]>
Cc: Daniel Vetter <[email-masked]>
Cc: [email-masked]
Cc: [email-masked]
Signed-off-by: Rob Herring <[email-masked]>
---
 drivers/gpu/drm/rockchip/Makefile             |   1 -
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c   |  10 +-
 drivers/gpu/drm/rockchip/rockchip_drm_drv.h   |   2 -
 drivers/gpu/drm/rockchip/rockchip_drm_fb.c    |  14 --
 drivers/gpu/drm/rockchip/rockchip_drm_fb.h    |   6 -
 drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c | 170 ------------------
 drivers/gpu/drm/rockchip/rockchip_drm_fbdev.h |  24 ---
 drivers/gpu/drm/rockchip/rockchip_drm_gem.c   |   5 +-
 drivers/gpu/drm/rockchip/rockchip_drm_gem.h   |   4 -
 9 files changed, 6 insertions(+), 230 deletions(-)
 delete mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
 delete mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_fbdev.h

diff --git a/drivers/gpu/drm/rockchip/Makefile b/drivers/gpu/drm/rockchip/Makefile
index 17a9e7eb2130..1a56f696558c 100644
--- a/drivers/gpu/drm/rockchip/Makefile
+++ b/drivers/gpu/drm/rockchip/Makefile
@@ -5,7 +5,6 @@
 
 rockchipdrm-y := rockchip_drm_drv.o rockchip_drm_fb.o \
 		rockchip_drm_gem.o rockchip_drm_vop.o rockchip_vop_reg.o
-rockchipdrm-$(CONFIG_DRM_FBDEV_EMULATION) += rockchip_drm_fbdev.o
 
 rockchipdrm-$(CONFIG_ROCKCHIP_ANALOGIX_DP) += analogix_dp-rockchip.o
 rockchipdrm-$(CONFIG_ROCKCHIP_CDN_DP) += cdn-dp-core.o cdn-dp-reg.o
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 20ecb1508a22..95a489c481d5 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -25,7 +25,6 @@
 
 #include "rockchip_drm_drv.h"
 #include "rockchip_drm_fb.h"
-#include "rockchip_drm_fbdev.h"
 #include "rockchip_drm_gem.h"
 
 #define DRIVER_NAME	"rockchip"
@@ -156,10 +155,6 @@ static int rockchip_drm_bind(struct device *dev)
 	 */
 	drm_dev->irq_enabled = true;
 
-	ret = rockchip_drm_fbdev_init(drm_dev);
-	if (ret)
-		goto err_unbind_all;
-
 	/* init kms poll for handling hpd */
 	drm_kms_helper_poll_init(drm_dev);
 
@@ -167,10 +162,11 @@ static int rockchip_drm_bind(struct device *dev)
 	if (ret)
 		goto err_kms_helper_poll_fini;
 
+	drm_fbdev_generic_setup(drm_dev, 32);
+
 	return 0;
 err_kms_helper_poll_fini:
 	drm_kms_helper_poll_fini(drm_dev);
-	rockchip_drm_fbdev_fini(drm_dev);
 err_unbind_all:
 	component_unbind_all(dev, drm_dev);
 err_mode_config_cleanup:
@@ -189,7 +185,6 @@ static void rockchip_drm_unbind(struct device *dev)
 
 	drm_dev_unregister(drm_dev);
 
-	rockchip_drm_fbdev_fini(drm_dev);
 	drm_kms_helper_poll_fini(drm_dev);
 
 	drm_atomic_helper_shutdown(drm_dev);
@@ -215,7 +210,6 @@ static const struct file_operations rockchip_drm_driver_fops = {
 
 static struct drm_driver rockchip_drm_driver = {
 	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
-	.lastclose		= drm_fb_helper_lastclose,
 	.gem_vm_ops		= &drm_gem_cma_vm_ops,
 	.gem_free_object_unlocked = rockchip_gem_free_object,
 	.dumb_create		= rockchip_gem_dumb_create,
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
index c5b06048124e..397d6582aabe 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
@@ -42,8 +42,6 @@ struct rockchip_crtc_state {
  * @mm_lock: protect drm_mm on multi-threads.
  */
 struct rockchip_drm_private {
-	struct drm_fb_helper fbdev_helper;
-	struct drm_gem_object *fbdev_bo;
 	struct iommu_domain *domain;
 	struct mutex mm_lock;
 	struct drm_mm mm;
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
index ca01234c037c..2c01074b0d3c 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
@@ -116,20 +116,6 @@ static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
 	.atomic_commit = drm_atomic_helper_commit,
 };
 
-struct drm_framebuffer *
-rockchip_drm_framebuffer_init(struct drm_device *dev,
-			      const struct drm_mode_fb_cmd2 *mode_cmd,
-			      struct drm_gem_object *obj)
-{
-	struct drm_framebuffer *fb;
-
-	fb = rockchip_fb_alloc(dev, mode_cmd, &obj, 1);
-	if (IS_ERR(fb))
-		return ERR_CAST(fb);
-
-	return fb;
-}
-
 void rockchip_drm_mode_config_init(struct drm_device *dev)
 {
 	dev->mode_config.min_width = 0;
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.h b/drivers/gpu/drm/rockchip/rockchip_drm_fb.h
index 1a696521096d..bae4e079dfb1 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.h
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.h
@@ -7,11 +7,5 @@
 #ifndef _ROCKCHIP_DRM_FB_H
 #define _ROCKCHIP_DRM_FB_H
 
-struct drm_framebuffer *
-rockchip_drm_framebuffer_init(struct drm_device *dev,
-			      const struct drm_mode_fb_cmd2 *mode_cmd,
-			      struct drm_gem_object *obj);
-void rockchip_drm_framebuffer_fini(struct drm_framebuffer *fb);
-
 void rockchip_drm_mode_config_init(struct drm_device *dev);
 #endif /* _ROCKCHIP_DRM_FB_H */
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c b/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
deleted file mode 100644
index 02be6c5ff857..000000000000
--- a/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
+++ /dev/null
@@ -1,170 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
- * Author:Mark Yao <[email-masked]>
- */
-
-#include <drm/drm.h>
-#include <drm/drm_fb_helper.h>
-#include <drm/drm_fourcc.h>
-#include <drm/drm_probe_helper.h>
-
-#include "rockchip_drm_drv.h"
-#include "rockchip_drm_gem.h"
-#include "rockchip_drm_fb.h"
-#include "rockchip_drm_fbdev.h"
-
-#define PREFERRED_BPP		32
-#define to_drm_private(x) \
-		container_of(x, struct rockchip_drm_private, fbdev_helper)
-
-static int rockchip_fbdev_mmap(struct fb_info *info,
-			       struct vm_area_struct *vma)
-{
-	struct drm_fb_helper *helper = info->par;
-	struct rockchip_drm_private *private = to_drm_private(helper);
-
-	return rockchip_gem_mmap_buf(private->fbdev_bo, vma);
-}
-
-static struct fb_ops rockchip_drm_fbdev_ops = {
-	.owner		= THIS_MODULE,
-	DRM_FB_HELPER_DEFAULT_OPS,
-	.fb_mmap	= rockchip_fbdev_mmap,
-	.fb_fillrect	= drm_fb_helper_cfb_fillrect,
-	.fb_copyarea	= drm_fb_helper_cfb_copyarea,
-	.fb_imageblit	= drm_fb_helper_cfb_imageblit,
-};
-
-static int rockchip_drm_fbdev_create(struct drm_fb_helper *helper,
-				     struct drm_fb_helper_surface_size *sizes)
-{
-	struct rockchip_drm_private *private = to_drm_private(helper);
-	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
-	struct drm_device *dev = helper->dev;
-	struct rockchip_gem_object *rk_obj;
-	struct drm_framebuffer *fb;
-	unsigned int bytes_per_pixel;
-	unsigned long offset;
-	struct fb_info *fbi;
-	size_t size;
-	int ret;
-
-	bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
-
-	mode_cmd.width = sizes->surface_width;
-	mode_cmd.height = sizes->surface_height;
-	mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
-	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
-		sizes->surface_depth);
-
-	size = mode_cmd.pitches[0] * mode_cmd.height;
-
-	rk_obj = rockchip_gem_create_object(dev, size, true);
-	if (IS_ERR(rk_obj))
-		return -ENOMEM;
-
-	private->fbdev_bo = &rk_obj->base;
-
-	fbi = drm_fb_helper_alloc_fbi(helper);
-	if (IS_ERR(fbi)) {
-		DRM_DEV_ERROR(dev->dev, "Failed to create framebuffer info.\n");
-		ret = PTR_ERR(fbi);
-		goto out;
-	}
-
-	helper->fb = rockchip_drm_framebuffer_init(dev, &mode_cmd,
-						   private->fbdev_bo);
-	if (IS_ERR(helper->fb)) {
-		DRM_DEV_ERROR(dev->dev,
-			      "Failed to allocate DRM framebuffer.\n");
-		ret = PTR_ERR(helper->fb);
-		goto out;
-	}
-
-	fbi->fbops = &rockchip_drm_fbdev_ops;
-
-	fb = helper->fb;
-	drm_fb_helper_fill_info(fbi, helper, sizes);
-
-	offset = fbi->var.xoffset * bytes_per_pixel;
-	offset += fbi->var.yoffset * fb->pitches[0];
-
-	dev->mode_config.fb_base = 0;
-	fbi->screen_base = rk_obj->kvaddr + offset;
-	fbi->screen_size = rk_obj->base.size;
-	fbi->fix.smem_len = rk_obj->base.size;
-
-	DRM_DEBUG_KMS("FB [%dx%d]-%d kvaddr=%p offset=%ld size=%zu\n",
-		      fb->width, fb->height, fb->format->depth,
-		      rk_obj->kvaddr,
-		      offset, size);
-
-	return 0;
-
-out:
-	rockchip_gem_free_object(&rk_obj->base);
-	return ret;
-}
-
-static const struct drm_fb_helper_funcs rockchip_drm_fb_helper_funcs = {
-	.fb_probe = rockchip_drm_fbdev_create,
-};
-
-int rockchip_drm_fbdev_init(struct drm_device *dev)
-{
-	struct rockchip_drm_private *private = dev->dev_private;
-	struct drm_fb_helper *helper;
-	int ret;
-
-	if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
-		return -EINVAL;
-
-	helper = &private->fbdev_helper;
-
-	drm_fb_helper_prepare(dev, helper, &rockchip_drm_fb_helper_funcs);
-
-	ret = drm_fb_helper_init(dev, helper, ROCKCHIP_MAX_CONNECTOR);
-	if (ret < 0) {
-		DRM_DEV_ERROR(dev->dev,
-			      "Failed to initialize drm fb helper - %d.\n",
-			      ret);
-		return ret;
-	}
-
-	ret = drm_fb_helper_single_add_all_connectors(helper);
-	if (ret < 0) {
-		DRM_DEV_ERROR(dev->dev,
-			      "Failed to add connectors - %d.\n", ret);
-		goto err_drm_fb_helper_fini;
-	}
-
-	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
-	if (ret < 0) {
-		DRM_DEV_ERROR(dev->dev,
-			      "Failed to set initial hw config - %d.\n",
-			      ret);
-		goto err_drm_fb_helper_fini;
-	}
-
-	return 0;
-
-err_drm_fb_helper_fini:
-	drm_fb_helper_fini(helper);
-	return ret;
-}
-
-void rockchip_drm_fbdev_fini(struct drm_device *dev)
-{
-	struct rockchip_drm_private *private = dev->dev_private;
-	struct drm_fb_helper *helper;
-
-	helper = &private->fbdev_helper;
-
-	drm_fb_helper_unregister_fbi(helper);
-
-	if (helper->fb)
-		drm_framebuffer_put(helper->fb);
-
-	drm_fb_helper_fini(helper);
-}
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.h b/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.h
deleted file mode 100644
index 5fb7ac2371a8..000000000000
--- a/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.h
+++ /dev/null
@@ -1,24 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
- * Author:Mark Yao <[email-masked]>
- */
-
-#ifndef _ROCKCHIP_DRM_FBDEV_H
-#define _ROCKCHIP_DRM_FBDEV_H
-
-#ifdef CONFIG_DRM_FBDEV_EMULATION
-int rockchip_drm_fbdev_init(struct drm_device *dev);
-void rockchip_drm_fbdev_fini(struct drm_device *dev);
-#else
-static inline int rockchip_drm_fbdev_init(struct drm_device *dev)
-{
-	return 0;
-}
-
-static inline void rockchip_drm_fbdev_fini(struct drm_device *dev)
-{
-}
-#endif
-
-#endif /* _ROCKCHIP_DRM_FBDEV_H */
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
index f09b9a035376..0562d7e30af5 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
@@ -370,13 +370,14 @@ void rockchip_gem_free_object(struct drm_gem_object *obj)
 static struct rockchip_gem_object *
 rockchip_gem_create_with_handle(struct drm_file *file_priv,
 				struct drm_device *drm, unsigned int size,
+				bool alloc_kmap,
 				unsigned int *handle)
 {
 	struct rockchip_gem_object *rk_obj;
 	struct drm_gem_object *obj;
 	int ret;
 
-	rk_obj = rockchip_gem_create_object(drm, size, false);
+	rk_obj = rockchip_gem_create_object(drm, size, alloc_kmap);
 	if (IS_ERR(rk_obj))
 		return ERR_CAST(rk_obj);
 
@@ -414,6 +415,7 @@ int rockchip_gem_dumb_create(struct drm_file *file_priv,
 {
 	struct rockchip_gem_object *rk_obj;
 	int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
+	bool alloc_kmap = args->flags & DRM_MODE_DUMB_KERNEL_MAP;
 
 	/*
 	 * align to 64 bytes since Mali requires it.
@@ -423,6 +425,7 @@ int rockchip_gem_dumb_create(struct drm_file *file_priv,
 	args->size = args->pitch * args->height;
 
 	rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
+						 alloc_kmap,
 						 &args->handle);
 
 	return PTR_ERR_OR_ZERO(rk_obj);
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.h b/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
index 7ffc541bea07..3a2e7065ab13 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
@@ -41,10 +41,6 @@ int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma);
 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
 			  struct vm_area_struct *vma);
 
-struct rockchip_gem_object *
-	rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
-				   bool alloc_kmap);
-
 void rockchip_gem_free_object(struct drm_gem_object *obj);
 
 int rockchip_gem_dumb_create(struct drm_file *file_priv,
-- 
2.20.1

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