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* [PATCH 1/3] drm/dp: WARN about invalid/unknown link rates and bw codes
@ 2017-10-09  9:29 Jani Nikula
  2017-10-09  9:29 ` [PATCH 2/3] drm/i915/dp: centralize max source rate conditions more Jani Nikula
                   ` (7 more replies)
  0 siblings, 8 replies; 13+ messages in thread
From: Jani Nikula @ 2017-10-09  9:29 UTC (permalink / raw)
  To: intel-gfx; +Cc: jani.nikula, dri-devel, Alex Deucher, Thierry Reding

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>
---
 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

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^ permalink raw reply related	[flat|nested] 13+ messages in thread

end of thread, other threads:[~2017-10-11 19:11 UTC | newest]

Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-10-09  9:29 [PATCH 1/3] drm/dp: WARN about invalid/unknown link rates and bw codes Jani Nikula
2017-10-09  9:29 ` [PATCH 2/3] drm/i915/dp: centralize max source rate conditions more Jani Nikula
2017-10-10 18:35   ` Manasi Navare
2017-10-09  9:29 ` [PATCH 3/3] drm/i915/dp: limit sink rates based on rate Jani Nikula
2017-10-10 18:38   ` Manasi Navare
2017-10-09 10:03 ` ✗ Fi.CI.BAT: warning for series starting with [1/3] drm/dp: WARN about invalid/unknown link rates and bw codes Patchwork
2017-10-09 10:32 ` [PATCH 1/3] " Thierry Reding
2017-10-11 16:03   ` Jani Nikula
2017-10-09 11:40 ` ✓ Fi.CI.BAT: success for series starting with [1/3] " Patchwork
2017-10-09 13:41 ` ✗ Fi.CI.IGT: failure " Patchwork
2017-10-11 19:11   ` Jani Nikula
2017-10-09 18:10 ` [PATCH 1/3] " Deucher, Alexander
2017-10-10 18:19 ` Manasi Navare

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