diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.14.71/5038-drm-amd-display-Report-non-DP-display-as-disconnecte.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.14.71/5038-drm-amd-display-Report-non-DP-display-as-disconnecte.patch | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.14.71/5038-drm-amd-display-Report-non-DP-display-as-disconnecte.patch b/common/recipes-kernel/linux/linux-yocto-4.14.71/5038-drm-amd-display-Report-non-DP-display-as-disconnecte.patch new file mode 100644 index 00000000..e934f41e --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.14.71/5038-drm-amd-display-Report-non-DP-display-as-disconnecte.patch @@ -0,0 +1,54 @@ +From 1770c8348bb00c968234d6c903aa82961efc02b4 Mon Sep 17 00:00:00 2001 +From: Harry Wentland <harry.wentland@amd.com> +Date: Wed, 1 Aug 2018 10:48:23 -0400 +Subject: [PATCH 5038/5725] drm/amd/display: Report non-DP display as + disconnected without EDID + +[Why] +Some boards seem to have a problem where HPD is high on HDMI even though +no display is connected. We don't want to report these as connected. DP +spec still requires us to report DP displays as connected when HPD is +high but we can't read the EDID in order to go to fail-safe mode. + +[How] +If connector_signal is not DP abort detection if we can't retrieve the +EDID. + +v2: Add Bugzilla and stable + +Bugzilla: https://bugs.freedesktop.org/107390 +Bugzilla: https://bugs.freedesktop.org/106846 +Cc: stable@vger.kernel.org +Signed-off-by: Harry Wentland <harry.wentland@amd.com> +Acked-by: Alex Deucher <alexander.deucher@amd.com> +Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> +Signed-off-by: Alex Deucher <alexander.deucher@amd.com> +--- + drivers/gpu/drm/amd/display/dc/core/dc_link.c | 11 +++++++++++ + 1 file changed, 11 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 7962141..cbfb1ae 100644 +--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c ++++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c +@@ -744,6 +744,17 @@ bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason) + break; + case EDID_NO_RESPONSE: + DC_LOG_ERROR("No EDID read.\n"); ++ ++ /* ++ * Abort detection for non-DP connectors if we have ++ * no EDID ++ * ++ * DP needs to report as connected if HDP is high ++ * even if we have no EDID in order to go to ++ * fail-safe mode ++ */ ++ if (!dc_is_dp_signal(link->connector_signal)) ++ return false; + default: + break; + } +-- +2.7.4 + |