leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drm/i915: don't send DP "idle" pattern before "normal" on HSW PORT_A

Browse Source 
The DP_TP_STATUS register for PORT_A doesn't exist. Our documentation
will be fixed soon, so the code does not match it for now.

This solves "Timed out waiting for DP idle patterns" and "unclaimed
register" messages on eDP.

V1: Was called "drm/i915: don't read DP_TP_STATUS(PORT_A)"
V2: Was called "drm/i915: don't send DP idle pattern before normal
pattern on HSW"
V3: Only change the code that touches PORT_A.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Paulo Zanoni 2013-01-29 16:35:18 -02:00 committed by Daniel Vetter
parent d5f21e4072
commit 10aa17c86f
1 changed files with 10 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/gpu/drm/i915/intel_dp.c
View File

@ -1785,14 +1785,18 @@ intel_dp_set_link_train(struct intel_dp *intel_dp,
temp &= ~DP_TP_CTL_LINK_TRAIN_MASK;
switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
case DP_TRAINING_PATTERN_DISABLE:
temp |= DP_TP_CTL_LINK_TRAIN_IDLE;
I915_WRITE(DP_TP_CTL(port), temp);
if (wait_for((I915_READ(DP_TP_STATUS(port)) &
DP_TP_STATUS_IDLE_DONE), 1))
DRM_ERROR("Timed out waiting for DP idle patterns\n");
if (port != PORT_A) {
temp |= DP_TP_CTL_LINK_TRAIN_IDLE;
I915_WRITE(DP_TP_CTL(port), temp);
if (wait_for((I915_READ(DP_TP_STATUS(port)) &
DP_TP_STATUS_IDLE_DONE), 1))
DRM_ERROR("Timed out waiting for DP idle patterns\n");
temp &= ~DP_TP_CTL_LINK_TRAIN_MASK;
}
temp &= ~DP_TP_CTL_LINK_TRAIN_MASK;
temp |= DP_TP_CTL_LINK_TRAIN_NORMAL;
break;