From ae4b78a429eee5796624e1c0040d308b3a84ed52 Mon Sep 17 00:00:00 2001 From: Todd Previte Date: Mon, 14 Jul 2014 11:50:10 -0700 Subject: [PATCH 09/12] drm/i915: Update intel_dp_check_link_status() for Displayport compliance testing Move the DPCD read to the top and check for an interrupt from the sink to catch Displayport automated testing requests necessary to support Displayport compliance testing. The checks for active connectors and link status are moved below the check for the interrupt. Adds a check at the top to verify that the device is connected. This is necessary for DP compliance testing to ensure that test requests are captured and acknowledged. If a test request is present during a connected->disconnected transition, the test code will attempt to execute even though the connection has been disabled, resulting in a faied test. Signed-off-by: Todd Previte --- drivers/gpu/drm/i915/intel_dp.c | 32 ++++++++++++++++++-------------- 1 file changed, 18 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 1c6ee34..65830e9 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3600,22 +3600,13 @@ intel_dp_check_link_status(struct intel_dp *intel_dp) u8 sink_irq_vector; u8 link_status[DP_LINK_STATUS_SIZE]; - /* FIXME: This access isn't protected by any locks. */ - if (!intel_encoder->connectors_active) - return; - - if (WARN_ON(!intel_encoder->base.crtc)) + /* Bail if not connected */ + if (intel_dp->attached_connector->base.status != connector_status_connected) return; - /* Try to read receiver status if the link appears to be up */ - if (!intel_dp_get_link_status(intel_dp, link_status)) { - return; - } - - /* Now read the DPCD to see if it's actually running */ - if (!intel_dp_get_dpcd(intel_dp)) { + /* Attempt to read the DPCD */ + if (!intel_dp_get_dpcd(intel_dp)) return; - } /* Try to read the source of the interrupt */ if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 && @@ -3625,12 +3616,25 @@ intel_dp_check_link_status(struct intel_dp *intel_dp) DP_DEVICE_SERVICE_IRQ_VECTOR, sink_irq_vector); - if (sink_irq_vector & DP_AUTOMATED_TEST_REQUEST) + if (sink_irq_vector & DP_AUTOMATED_TEST_REQUEST) { + DRM_DEBUG_KMS("Displayport: Received automated test request\n"); intel_dp_handle_test_request(intel_dp); + } if (sink_irq_vector & (DP_CP_IRQ | DP_SINK_SPECIFIC_IRQ)) DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n"); } + /* FIXME: This access isn't protected by any locks. */ + if (!intel_encoder->connectors_active) + return; + + if (WARN_ON(!intel_encoder->base.crtc)) + return; + + /* Try to read receiver status if the link appears to be up */ + if (!intel_dp_get_link_status(intel_dp, link_status)) + return; + if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) { DRM_DEBUG_KMS("%s: channel EQ not ok, retraining\n", intel_encoder->base.name); -- 1.9.1