diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.14.71/4894-drm-amd-display-support-access-ddc-for-mst-branch.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.14.71/4894-drm-amd-display-support-access-ddc-for-mst-branch.patch | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.14.71/4894-drm-amd-display-support-access-ddc-for-mst-branch.patch b/common/recipes-kernel/linux/linux-yocto-4.14.71/4894-drm-amd-display-support-access-ddc-for-mst-branch.patch new file mode 100644 index 00000000..e24246cc --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.14.71/4894-drm-amd-display-support-access-ddc-for-mst-branch.patch @@ -0,0 +1,40 @@ +From 07cb2ad65e7c2bc5cb69c0ae21d3cfce96e247ab Mon Sep 17 00:00:00 2001 +From: Eric Yang <Eric.Yang2@amd.com> +Date: Tue, 12 Jun 2018 18:37:12 -0400 +Subject: [PATCH 4894/5725] drm/amd/display: support access ddc for mst branch + +[Why] +Megachip dockings accesses ddc line through display driver when +installing FW. Previously, we would fail every transaction because +link attached to mst branch did not have their ddc transaction type +set. + +[How] +Set ddc transaction type when mst branch is connected. + +Signed-off-by: Eric Yang <Eric.Yang2@amd.com> +Reviewed-by: Charlene Liu <Charlene.Liu@amd.com> +Acked-by: Harry Wentland <harry.wentland@amd.com> +Signed-off-by: Alex Deucher <alexander.deucher@amd.com> +--- + drivers/gpu/drm/amd/display/dc/core/dc_link.c | 4 ++++ + 1 file changed, 4 insertions(+) + +diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c +index e88dc58..9d5ccb6 100644 +--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c ++++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c +@@ -498,6 +498,10 @@ static bool detect_dp( + sink_caps->signal = SIGNAL_TYPE_DISPLAY_PORT_MST; + link->type = dc_connection_mst_branch; + ++ dal_ddc_service_set_transaction_type( ++ link->ddc, ++ sink_caps->transaction_type); ++ + /* + * This call will initiate MST topology discovery. Which + * will detect MST ports and add new DRM connector DRM +-- +2.7.4 + |