Commit 8f7f1b02 authored by Hamza Mahfooz's avatar Hamza Mahfooz Committed by Alex Deucher

drm/amd/display: fix flickering caused by S/G mode

Currently, on a handful of ASICs. We allow the framebuffer for a given
plane to exist in either VRAM or GTT. However, if the plane's new
framebuffer is in a different memory domain than it's previous
framebuffer, flipping between them can cause the screen to flicker. So,
to fix this, don't perform an immediate flip in the aforementioned case.

Cc: stable@vger.kernel.org
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2354Reviewed-by: default avatarRoman Li <Roman.Li@amd.com>
Fixes: 81d0bcf9 ("drm/amdgpu: make display pinning more flexible (v2)")
Signed-off-by: default avatarHamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 0026c273
......@@ -7901,6 +7901,13 @@ static void amdgpu_dm_commit_cursors(struct drm_atomic_state *state)
amdgpu_dm_plane_handle_cursor_update(plane, old_plane_state);
}
static inline uint32_t get_mem_type(struct drm_framebuffer *fb)
{
struct amdgpu_bo *abo = gem_to_amdgpu_bo(fb->obj[0]);
return abo->tbo.resource ? abo->tbo.resource->mem_type : 0;
}
static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
struct dc_state *dc_state,
struct drm_device *dev,
......@@ -8043,11 +8050,13 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
/*
* Only allow immediate flips for fast updates that don't
* change FB pitch, DCC state, rotation or mirroing.
* change memory domain, FB pitch, DCC state, rotation or
* mirroring.
*/
bundle->flip_addrs[planes_count].flip_immediate =
crtc->state->async_flip &&
acrtc_state->update_type == UPDATE_TYPE_FAST;
acrtc_state->update_type == UPDATE_TYPE_FAST &&
get_mem_type(old_plane_state->fb) == get_mem_type(fb);
timestamp_ns = ktime_get_ns();
bundle->flip_addrs[planes_count].flip_timestamp_in_us = div_u64(timestamp_ns, 1000);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment