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| author | Thomas Zimmermann <tzimmermann@suse.de> | 2020-09-14 10:22:34 +0300 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2020-09-16 14:08:01 +0300 |
| commit | 39edb28780e8bf623565fbd2fd0ea091f315ceb3 (patch) | |
| tree | 77ff9cb20ef5b06e3007e5e3c615a59fc489bfcf /drivers/gpu/drm/ast/ast_drv.h | |
| parent | 5638c82cdabd95c8e82672760a9799c2f2848ba9 (diff) | |
| download | linux-39edb28780e8bf623565fbd2fd0ea091f315ceb3.tar.xz | |
drm/ast: Disable planes while switching display modes
The ast HW cursor requires the primary plane and CRTC to display at
a valid mode and format. This is not the case while switching
display modes, which can lead to the screen turing permanently dark.
As a workaround, the ast driver now disables active planes while the
mode or format switch takes place. It also synchronizes with the vertical
refresh to give CRTC and planes some time to catch up on each other.
The active planes planes (primary or cursor) will be re-enabled by
each plane's atomic_update() function.
v3:
* move the logic into the CRTC's atomic_disable function
v2:
* move the logic into the commit-tail function
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200914072236.19398-3-tzimmermann@suse.de
Diffstat (limited to 'drivers/gpu/drm/ast/ast_drv.h')
| -rw-r--r-- | drivers/gpu/drm/ast/ast_drv.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h index c1af6b725933..467049ca8430 100644 --- a/drivers/gpu/drm/ast/ast_drv.h +++ b/drivers/gpu/drm/ast/ast_drv.h @@ -177,6 +177,8 @@ struct ast_private *ast_device_create(struct drm_driver *drv, #define AST_IO_MM_OFFSET (0x380) +#define AST_IO_VGAIR1_VREFRESH BIT(3) + #define __ast_read(x) \ static inline u##x ast_read##x(struct ast_private *ast, u32 reg) { \ u##x val = 0;\ |