drm/hisilicon/hibmc: Switch to generic fbdev emulation

There's nothing special about hibmc's fbdev emulation that is not
provided by the generic implementation. Switch over and remove the
driver's code.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191203083819.6643-2-tzimmermann@suse.de

drivers/gpu/drm/hisilicon/hibmc/Makefile

 # SPDX-License-Identifier: GPL-2.0-only
-hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_de.o hibmc_drm_vdac.o hibmc_drm_fbdev.o hibmc_ttm.o
+hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_de.o hibmc_drm_vdac.o hibmc_ttm.o
 
 obj-$(CONFIG_DRM_HISI_HIBMC) += hibmc-drm.o

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c

@@ -17,6 +17,7 @@
 
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
 #include <drm/drm_gem_vram_helper.h>
 #include <drm/drm_irq.h>
 #include <drm/drm_print.h>
@@ -247,8 +248,6 @@ static int hibmc_unload(struct drm_device *dev)
 {
 	struct hibmc_drm_private *priv = dev->dev_private;
 
-	hibmc_fbdev_fini(priv);
-
 	drm_atomic_helper_shutdown(dev);
 
 	if (dev->irq_enabled)
@@ -307,7 +306,7 @@ static int hibmc_load(struct drm_device *dev)
 	/* reset all the states of crtc/plane/encoder/connector */
 	drm_mode_config_reset(dev);
 
-	ret = hibmc_fbdev_init(priv);
+	ret = drm_fbdev_generic_setup(dev, 16);
 	if (ret) {
 		DRM_ERROR("failed to initialize fbdev: %d\n", ret);
 		goto err;

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h

@@ -25,12 +25,6 @@ struct hibmc_framebuffer {
 	struct drm_gem_object *obj;
 };
 
-struct hibmc_fbdev {
-	struct drm_fb_helper helper; /* must be first */
-	struct hibmc_framebuffer *fb;
-	int size;
-};
-
 struct hibmc_drm_private {
 	/* hw */
 	void __iomem   *mmio;
@@ -42,9 +36,6 @@ struct hibmc_drm_private {
 	/* drm */
 	struct drm_device  *dev;
 	bool mode_config_initialized;
-
-	/* fbdev */
-	struct hibmc_fbdev *fbdev;
 };
 
 #define to_hibmc_framebuffer(x) container_of(x, struct hibmc_framebuffer, fb)
@@ -56,8 +47,6 @@ void hibmc_set_current_gate(struct hibmc_drm_private *priv,
 
 int hibmc_de_init(struct hibmc_drm_private *priv);
 int hibmc_vdac_init(struct hibmc_drm_private *priv);
-int hibmc_fbdev_init(struct hibmc_drm_private *priv);
-void hibmc_fbdev_fini(struct hibmc_drm_private *priv);
 
 int hibmc_gem_create(struct drm_device *dev, u32 size, bool iskernel,
 		     struct drm_gem_object **obj);

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_fbdev.c

-// SPDX-License-Identifier: GPL-2.0-or-later
-/* Hisilicon Hibmc SoC drm driver
- *
- * Based on the bochs drm driver.
- *
- * Copyright (c) 2016 Huawei Limited.
- *
- * Author:
- *	Rongrong Zou <zourongrong@huawei.com>
- *	Rongrong Zou <zourongrong@gmail.com>
- *	Jianhua Li <lijianhua@huawei.com>
- */
-
-#include <drm/drm_crtc.h>
-#include <drm/drm_fb_helper.h>
-#include <drm/drm_fourcc.h>
-#include <drm/drm_gem_vram_helper.h>
-#include <drm/drm_probe_helper.h>
-
-#include "hibmc_drm_drv.h"
-
-static int hibmcfb_create_object(
-				struct hibmc_drm_private *priv,
-				const struct drm_mode_fb_cmd2 *mode_cmd,
-				struct drm_gem_object **gobj_p)
-{
-	struct drm_gem_object *gobj;
-	struct drm_device *dev = priv->dev;
-	u32 size;
-	int ret = 0;
-
-	size = mode_cmd->pitches[0] * mode_cmd->height;
-	ret = hibmc_gem_create(dev, size, true, &gobj);
-	if (ret)
-		return ret;
-
-	*gobj_p = gobj;
-	return ret;
-}
-
-static const struct fb_ops hibmc_drm_fb_ops = {
-	.owner = THIS_MODULE,
-	.fb_check_var = drm_fb_helper_check_var,
-	.fb_set_par = drm_fb_helper_set_par,
-	.fb_fillrect = drm_fb_helper_sys_fillrect,
-	.fb_copyarea = drm_fb_helper_sys_copyarea,
-	.fb_imageblit = drm_fb_helper_sys_imageblit,
-	.fb_pan_display = drm_fb_helper_pan_display,
-	.fb_blank = drm_fb_helper_blank,
-	.fb_setcmap = drm_fb_helper_setcmap,
-};
-
-static int hibmc_drm_fb_create(struct drm_fb_helper *helper,
-			       struct drm_fb_helper_surface_size *sizes)
-{
-	struct hibmc_fbdev *hi_fbdev =
-		container_of(helper, struct hibmc_fbdev, helper);
-	struct hibmc_drm_private *priv = helper->dev->dev_private;
-	struct fb_info *info;
-	struct drm_mode_fb_cmd2 mode_cmd;
-	struct drm_gem_object *gobj = NULL;
-	int ret = 0;
-	size_t size;
-	unsigned int bytes_per_pixel;
-	struct drm_gem_vram_object *gbo = NULL;
-	void *base;
-
-	DRM_DEBUG_DRIVER("surface width(%d), height(%d) and bpp(%d)\n",
-			 sizes->surface_width, sizes->surface_height,
-			 sizes->surface_bpp);
-
-	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] = mode_cmd.width * bytes_per_pixel;
-	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
-							  sizes->surface_depth);
-
-	size = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height);
-
-	ret = hibmcfb_create_object(priv, &mode_cmd, &gobj);
-	if (ret) {
-		DRM_ERROR("failed to create fbcon backing object: %d\n", ret);
-		return -ENOMEM;
-	}
-
-	gbo = drm_gem_vram_of_gem(gobj);
-
-	ret = drm_gem_vram_pin(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM);
-	if (ret) {
-		DRM_ERROR("failed to pin fbcon: %d\n", ret);
-		goto out_unref_gem;
-	}
-
-	base = drm_gem_vram_kmap(gbo, true, NULL);
-	if (IS_ERR(base)) {
-		ret = PTR_ERR(base);
-		DRM_ERROR("failed to kmap fbcon: %d\n", ret);
-		goto out_unpin_bo;
-	}
-
-	info = drm_fb_helper_alloc_fbi(helper);
-	if (IS_ERR(info)) {
-		ret = PTR_ERR(info);
-		DRM_ERROR("failed to allocate fbi: %d\n", ret);
-		goto out_release_fbi;
-	}
-
-	hi_fbdev->fb = hibmc_framebuffer_init(priv->dev, &mode_cmd, gobj);
-	if (IS_ERR(hi_fbdev->fb)) {
-		ret = PTR_ERR(hi_fbdev->fb);
-		hi_fbdev->fb = NULL;
-		DRM_ERROR("failed to initialize framebuffer: %d\n", ret);
-		goto out_release_fbi;
-	}
-
-	priv->fbdev->size = size;
-	hi_fbdev->helper.fb = &hi_fbdev->fb->fb;
-
-	info->fbops = &hibmc_drm_fb_ops;
-
-	drm_fb_helper_fill_info(info, &priv->fbdev->helper, sizes);
-
-	info->screen_base = base;
-	info->screen_size = size;
-
-	info->fix.smem_start = gbo->bo.mem.bus.offset + gbo->bo.mem.bus.base;
-	info->fix.smem_len = size;
-	return 0;
-
-out_release_fbi:
-	drm_gem_vram_kunmap(gbo);
-out_unpin_bo:
-	drm_gem_vram_unpin(gbo);
-out_unref_gem:
-	drm_gem_object_put_unlocked(gobj);
-
-	return ret;
-}
-
-static void hibmc_fbdev_destroy(struct hibmc_fbdev *fbdev)
-{
-	struct hibmc_framebuffer *gfb = fbdev->fb;
-	struct drm_fb_helper *fbh = &fbdev->helper;
-
-	drm_fb_helper_unregister_fbi(fbh);
-
-	drm_fb_helper_fini(fbh);
-
-	if (gfb)
-		drm_framebuffer_put(&gfb->fb);
-}
-
-static const struct drm_fb_helper_funcs hibmc_fbdev_helper_funcs = {
-	.fb_probe = hibmc_drm_fb_create,
-};
-
-int hibmc_fbdev_init(struct hibmc_drm_private *priv)
-{
-	int ret;
-	struct fb_var_screeninfo *var;
-	struct fb_fix_screeninfo *fix;
-	struct hibmc_fbdev *hifbdev;
-
-	hifbdev = devm_kzalloc(priv->dev->dev, sizeof(*hifbdev), GFP_KERNEL);
-	if (!hifbdev) {
-		DRM_ERROR("failed to allocate hibmc_fbdev\n");
-		return -ENOMEM;
-	}
-
-	priv->fbdev = hifbdev;
-	drm_fb_helper_prepare(priv->dev, &hifbdev->helper,
-			      &hibmc_fbdev_helper_funcs);
-
-	/* Now just one crtc and one channel */
-	ret = drm_fb_helper_init(priv->dev, &hifbdev->helper, 1);
-	if (ret) {
-		DRM_ERROR("failed to initialize fb helper: %d\n", ret);
-		return ret;
-	}
-
-	ret = drm_fb_helper_single_add_all_connectors(&hifbdev->helper);
-	if (ret) {
-		DRM_ERROR("failed to add all connectors: %d\n", ret);
-		goto fini;
-	}
-
-	ret = drm_fb_helper_initial_config(&hifbdev->helper, 16);
-	if (ret) {
-		DRM_ERROR("failed to setup initial conn config: %d\n", ret);
-		goto fini;
-	}
-
-	var = &hifbdev->helper.fbdev->var;
-	fix = &hifbdev->helper.fbdev->fix;
-
-	DRM_DEBUG_DRIVER("Member of info->var is :\n"
-			 "xres=%d\n"
-			 "yres=%d\n"
-			 "xres_virtual=%d\n"
-			 "yres_virtual=%d\n"
-			 "xoffset=%d\n"
-			 "yoffset=%d\n"
-			 "bits_per_pixel=%d\n"
-			 "...\n", var->xres, var->yres, var->xres_virtual,
-			 var->yres_virtual, var->xoffset, var->yoffset,
-			 var->bits_per_pixel);
-	DRM_DEBUG_DRIVER("Member of info->fix is :\n"
-			 "smem_start=%lx\n"
-			 "smem_len=%d\n"
-			 "type=%d\n"
-			 "type_aux=%d\n"
-			 "visual=%d\n"
-			 "xpanstep=%d\n"
-			 "ypanstep=%d\n"
-			 "ywrapstep=%d\n"
-			 "line_length=%d\n"
-			 "accel=%d\n"
-			 "capabilities=%d\n"
-			 "...\n", fix->smem_start, fix->smem_len, fix->type,
-			 fix->type_aux, fix->visual, fix->xpanstep,
-			 fix->ypanstep, fix->ywrapstep, fix->line_length,
-			 fix->accel, fix->capabilities);
-
-	return 0;
-
-fini:
-	drm_fb_helper_fini(&hifbdev->helper);
-	return ret;
-}
-
-void hibmc_fbdev_fini(struct hibmc_drm_private *priv)
-{
-	if (!priv->fbdev)
-		return;
-
-	hibmc_fbdev_destroy(priv->fbdev);
-	priv->fbdev = NULL;
-}