diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/3566-drm-amd-display-Skip-2-frames-when-first-reading-CRC.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/3566-drm-amd-display-Skip-2-frames-when-first-reading-CRC.patch | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/3566-drm-amd-display-Skip-2-frames-when-first-reading-CRC.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/3566-drm-amd-display-Skip-2-frames-when-first-reading-CRC.patch new file mode 100644 index 00000000..a70b4d3e --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/3566-drm-amd-display-Skip-2-frames-when-first-reading-CRC.patch @@ -0,0 +1,65 @@ +From 323537ff21858e9e39d867c4cabb4d09b5a781eb Mon Sep 17 00:00:00 2001 +From: "Leo (Sunpeng) Li" <sunpeng.li@amd.com> +Date: Tue, 6 Feb 2018 10:20:46 -0500 +Subject: [PATCH 3566/4131] drm/amd/display: Skip 2 frames when first reading + CRC + +Skipping the first frame will prevent uncoooked values most of the time. +However, in some unlikely cases, the second frame will be uncooked as +well. + +Signed-off-by: Leo (Sunpeng) Li <sunpeng.li@amd.com> +Reviewed-by: Harry Wentland <Harry.Wentland@amd.com> +Signed-off-by: Alex Deucher <alexander.deucher@amd.com> +--- + drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 2 +- + drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c | 12 ++++++------ + 2 files changed, 7 insertions(+), 7 deletions(-) + +diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h +index c40c13a..5b5fa80 100644 +--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h ++++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h +@@ -198,7 +198,7 @@ struct dm_crtc_state { + struct drm_crtc_state base; + struct dc_stream_state *stream; + +- bool crc_first_skipped; ++ int crc_skip_count; + bool crc_enabled; + }; + +diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c +index 45439752..ad80991 100644 +--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c ++++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c +@@ -84,8 +84,8 @@ int amdgpu_dm_crtc_set_crc_source(struct drm_crtc *crtc, const char *src_name, + } + + *values_cnt = 3; +- /* Reset crc_skipped flag on dm state */ +- crtc_state->crc_first_skipped = false; ++ /* Reset crc_skipped on dm state */ ++ crtc_state->crc_skip_count = 0; + return 0; + } + +@@ -109,11 +109,11 @@ void amdgpu_dm_crtc_handle_crc_irq(struct drm_crtc *crtc) + /* + * Since flipping and crc enablement happen asynchronously, we - more + * often than not - will be returning an 'uncooked' crc on first frame. +- * Probably because hw isn't ready yet. Simply skip the first crc +- * value. ++ * Probably because hw isn't ready yet. For added security, skip the ++ * first two CRC values. + */ +- if (!crtc_state->crc_first_skipped) { +- crtc_state->crc_first_skipped = true; ++ if (crtc_state->crc_skip_count < 2) { ++ crtc_state->crc_skip_count += 1; + return; + } + +-- +2.7.4 + |