diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2814-drm-amd-display-fix-MST-link-training-fail-division-.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2814-drm-amd-display-fix-MST-link-training-fail-division-.patch | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2814-drm-amd-display-fix-MST-link-training-fail-division-.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2814-drm-amd-display-fix-MST-link-training-fail-division-.patch new file mode 100644 index 00000000..83c90c91 --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2814-drm-amd-display-fix-MST-link-training-fail-division-.patch @@ -0,0 +1,38 @@ +From ed7179e8fec06fe9a1d572dbd76f29459d2e1dad Mon Sep 17 00:00:00 2001 +From: Eric Yang <Eric.Yang2@amd.com> +Date: Wed, 1 Nov 2017 15:43:47 -0400 +Subject: [PATCH 2814/4131] drm/amd/display: fix MST link training fail + division by 0 + +When link training fail in MST case, we will divide by 0 +when calculating avg_time_slots_per_mtp, so we cannot +proceed. + +Signed-off-by: Eric Yang <Eric.Yang2@amd.com> +Reviewed-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 | 6 ++++-- + 1 file changed, 4 insertions(+), 2 deletions(-) + +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 3b394a5..7b0e43c 100644 +--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c ++++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c +@@ -2386,9 +2386,11 @@ void core_link_enable_stream( + + /* Abort stream enable *unless* the failure was due to + * DP link training - some DP monitors will recover and +- * show the stream anyway. ++ * show the stream anyway. But MST displays can't proceed ++ * without link training. + */ +- if (status != DC_FAIL_DP_LINK_TRAINING) { ++ if (status != DC_FAIL_DP_LINK_TRAINING || ++ pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) { + BREAK_TO_DEBUGGER(); + return; + } +-- +2.7.4 + |