From: Jesse Barnes Date: Thu, 7 Jul 2011 18:10:59 +0000 (-0700) Subject: drm/i915/dp: read more receiver capability bits on hotplug X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=59cd09e1aea3ac6eb15b45e5d2261a63ecb1799c;p=openwrt%2Fstaging%2Fblogic.git drm/i915/dp: read more receiver capability bits on hotplug 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 Reviewed-by: Keith Packard Signed-off-by: Keith Packard --- diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index fc51730b89d6..a9a5051419df 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1522,6 +1522,8 @@ intel_dp_link_down(struct intel_dp *intel_dp) static void intel_dp_check_link_status(struct intel_dp *intel_dp) { + int ret; + if (!intel_dp->base.base.crtc) return; @@ -1530,6 +1532,15 @@ intel_dp_check_link_status(struct intel_dp *intel_dp) 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)) { intel_dp_start_link_train(intel_dp); intel_dp_complete_link_train(intel_dp);