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drm/i915/dp: read more receiver capability bits on hotplug

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When a hotplug event is received, we need to check the receiver cap bits
in case they've changed (as they might with a hub or chain config).

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Jesse Barnes 2011-07-07 11:10:59 -07:00 • committed by Keith Packard
commit 59cd09e1ae
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/i915/intel_dp.c
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@ -1522,6 +1522,8 @@ intel_dp_link_down(struct intel_dp *intel_dp)
static void static void
intel_dp_check_link_status(struct intel_dp *intel_dp) intel_dp_check_link_status(struct intel_dp *intel_dp)
{ {
int ret;
if (!intel_dp->base.base.crtc) if (!intel_dp->base.base.crtc)
return; return;
@ -1530,6 +1532,15 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
return; return;
} }
/* Try to read receiver status if the link appears to be up */
ret = intel_dp_aux_native_read(intel_dp,
0x000, intel_dp->dpcd,
sizeof (intel_dp->dpcd));
if (ret != sizeof(intel_dp->dpcd)) {
intel_dp_link_down(intel_dp);
return;
}
if (!intel_channel_eq_ok(intel_dp)) { if (!intel_channel_eq_ok(intel_dp)) {
intel_dp_start_link_train(intel_dp); intel_dp_start_link_train(intel_dp);
intel_dp_complete_link_train(intel_dp); intel_dp_complete_link_train(intel_dp);