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drm/msm: Use regular fbdev I/O helpers 

Use the regular fbdev helpers for framebuffer I/O instead of DRM's
helpers. Msm does not use damage handling, so DRM's fbdev helpers
are mere wrappers around the fbdev code.

By using fbdev helpers directly within each DRM fbdev emulation,
we can eventually remove DRM's wrapper functions entirely.

Msm's fbdev emulation has been incomplete as it didn't implement
damage handling. Partilly fix this by implementing damage handling
for write and draw operation. It is still missing for mmaped pages.

v4:
	* use initializer macros for struct fb_ops
	* partially support damage handling
v2:
	* use FB_SYS_HELPERS option

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Abhinav Kumar <quic_abhinavk@quicinc.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Sean Paul <sean@poorly.run>
Link: https://patchwork.freedesktop.org/patch/msgid/20230530151228.22979-12-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2023-05-30 17:12:26 +02:00
parent c51b36207c
commit 4a2262c121
2 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/msm/Kconfig
View File

@ -21,6 +21,7 @@ config DRM_MSM
select DRM_BRIDGE
select DRM_PANEL_BRIDGE
select DRM_SCHED
select FB_SYS_HELPERS if DRM_FBDEV_EMULATION
select SHMEM
select TMPFS
select QCOM_SCM

17
drivers/gpu/drm/msm/msm_fbdev.c
View File

@ -4,6 +4,8 @@
* Author: Rob Clark <robdclark@gmail.com>
*/
#include <linux/fb.h>
#include <drm/drm_drv.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
@ -23,6 +25,10 @@ module_param(fbdev, bool, 0600);
* fbdev funcs, to implement legacy fbdev interface on top of drm driver
*/
FB_GEN_DEFAULT_DEFERRED_SYS_OPS(msm_fbdev,
drm_fb_helper_damage_range,
drm_fb_helper_damage_area)
static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
@ -52,16 +58,9 @@ static void msm_fbdev_fb_destroy(struct fb_info *info)
static const struct fb_ops msm_fb_ops = {
.owner = THIS_MODULE,
__FB_DEFAULT_DEFERRED_OPS_RDWR(msm_fbdev),
DRM_FB_HELPER_DEFAULT_OPS,
/* Note: to properly handle manual update displays, we wrap the
* basic fbdev ops which write to the framebuffer
*/
.fb_read = drm_fb_helper_sys_read,
.fb_write = drm_fb_helper_sys_write,
.fb_fillrect = drm_fb_helper_sys_fillrect,
.fb_copyarea = drm_fb_helper_sys_copyarea,
.fb_imageblit = drm_fb_helper_sys_imageblit,
__FB_DEFAULT_DEFERRED_OPS_DRAW(msm_fbdev),
.fb_mmap = msm_fbdev_mmap,
.fb_destroy = msm_fbdev_fb_destroy,
};