-----Original Message----- From: Jani Nikula [mailto:jani.nikula@intel.com] Sent: Monday, October 09, 2017 5:30 AM To: intel-gfx@lists.freedesktop.org Cc: jani.nikula@intel.com; Deucher, Alexander; Thierry Reding; Rob Clark; Sean Paul; Manasi Navare; dri-devel@lists.freedesktop.org Subject: [PATCH 1/3] drm/dp: WARN about invalid/unknown link rates and bw codes
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 Signed-off-by: Jani Nikula jani.nikula@intel.com
Reviewed-by: Alex Deucher alexander.deucher@amd.com
drivers/gpu/drm/drm_dp_helper.c | 7 +++++-- 1 file 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..dca21b5a03ec 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;
-- 2.11.0