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drm/i915/dp: Dump DP link status when link training stages fail

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A full dump of link status can be handy in debugging link training
failures. Let's add that to the debug messages when link training fails.

v2: Removing unrelated clean up (Jani)
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470343716-5574-3-git-send-email-dhinakaran.pandiyan@intel.com
This commit is contained in:
Pandiyan, Dhinakaran 2016-08-04 13:48:36 -07:00 committed by Rodrigo Vivi
parent 8b0878a0a3
commit 8ab5de2e00
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/i915/intel_dp_link_training.c
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@ -23,6 +23,15 @@
#include "intel_drv.h"
static void
intel_dp_dump_link_status(const uint8_t link_status[DP_LINK_STATUS_SIZE])
{
DRM_DEBUG_KMS("ln0_1:0x%x ln2_3:0x%x align:0x%x sink:0x%x adj_req0_1:0x%x adj_req2_3:0x%x",
link_status[0], link_status[1], link_status[2],
link_status[3], link_status[4], link_status[5]);
}
static void
intel_get_adjust_train(struct intel_dp *intel_dp,
const uint8_t link_status[DP_LINK_STATUS_SIZE])
@ -168,6 +177,7 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp)
++loop_tries;
if (loop_tries == 5) {
DRM_ERROR("too many full retries, give up\n");
intel_dp_dump_link_status(link_status);
break;
}
intel_dp_reset_link_train(intel_dp,
@ -254,6 +264,7 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp)
if (cr_tries > 5) {
DRM_ERROR("failed to train DP, aborting\n");
intel_dp_dump_link_status(link_status);
break;
}