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authorJani Nikula <jani.nikula@intel.com>2017-10-09 12:29:57 +0300
committerJani Nikula <jani.nikula@intel.com>2017-10-11 18:41:44 +0300
commitcccf4e3fe3e286b55634c2c5d0c4399f4288e440 (patch)
tree6aafb195e7a512a18a29314bd602a1fd64eee004
parent7c0f24a4c49c336ba82a429ef2fed0008efa9422 (diff)
drm/dp: WARN about invalid/unknown link rates and bw codesdrm-misc-next-2017-10-12
Falling back to the lowest value is likely the only thing we can do, but doing it silently seems like a bad thing to do. Catch it early and make loud noises. Cc: Alex Deucher <alexander.deucher@amd.com> Cc: Thierry Reding <treding@nvidia.com> Cc: Rob Clark <robdclark@gmail.com> Cc: Sean Paul <seanpaul@chromium.org> Cc: Manasi Navare <manasi.d.navare@intel.com> Cc: dri-devel@lists.freedesktop.org Reviewed-by: Thierry Reding <treding@nvidia.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Reviewed-by: Manasi Navare <manasi.d.navare@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171009092959.29021-1-jani.nikula@intel.com
-rw-r--r--drivers/gpu/drm/drm_dp_helper.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 08af8d6b844b..b3d68964b407 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -137,8 +137,10 @@ EXPORT_SYMBOL(drm_dp_link_train_channel_eq_delay);
u8 drm_dp_link_rate_to_bw_code(int link_rate)
{
switch (link_rate) {
- case 162000:
default:
+ WARN(1, "unknown DP link rate %d, using %x\n", link_rate,
+ DP_LINK_BW_1_62);
+ case 162000:
return DP_LINK_BW_1_62;
case 270000:
return DP_LINK_BW_2_7;
@@ -151,8 +153,9 @@ EXPORT_SYMBOL(drm_dp_link_rate_to_bw_code);
int drm_dp_bw_code_to_link_rate(u8 link_bw)
{
switch (link_bw) {
- case DP_LINK_BW_1_62:
default:
+ WARN(1, "unknown DP link BW code %x, using 162000\n", link_bw);
+ case DP_LINK_BW_1_62:
return 162000;
case DP_LINK_BW_2_7:
return 270000;

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