From: "Thulasimani,Sivakumar" <sivakumar.thulasimani@xxxxxxxxx>
Compliance test 4.2.2.8 requires driver to read the sink_count for
short pulse interrupt even when the panel is not enabled.
This patch performs the following
a) reading sink_count by reusing intel_dp_detect_dpcd
instead of using intel_dp_get_dpcd
b) moving crtc enabled checks post sink_count read call
Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 117 ++++++++++++++++++++-------------------
1 file changed, 59 insertions(+), 58 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index b905c19..e4de8e5 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4342,6 +4342,56 @@ go_again:
return -EINVAL;
}
+/* XXX this is probably wrong for multiple downstream ports */
+static enum drm_connector_status
+intel_dp_detect_dpcd(struct intel_dp *intel_dp)
+{
+ uint8_t *dpcd = intel_dp->dpcd;
+ uint8_t type;
+
+ if (!intel_dp_get_dpcd(intel_dp))
+ return connector_status_disconnected;
+
+ /* if there's no downstream port, we're done */
+ if (!(dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT))
+ return connector_status_connected;
+
+ /* If we're HPD-aware, SINK_COUNT changes dynamically */
+ if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
+ intel_dp->downstream_ports[0] & DP_DS_PORT_HPD) {
+ uint8_t reg;
+
+ if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_SINK_COUNT,
+ ®, 1) < 0)
+ return connector_status_unknown;
+
+ return DP_GET_SINK_COUNT(reg) ? connector_status_connected
+ : connector_status_disconnected;
+ }
+
+ /* If no HPD, poke DDC gently */
+ if (drm_probe_ddc(&intel_dp->aux.ddc))
+ return connector_status_connected;
+
+ /* Well we tried, say unknown for unreliable port types */
+ if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11) {
+ type = intel_dp->downstream_ports[0] & DP_DS_PORT_TYPE_MASK;
+ if (type == DP_DS_PORT_TYPE_VGA ||
+ type == DP_DS_PORT_TYPE_NON_EDID)
+ return connector_status_unknown;
+ } else {
+ type = intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
+ DP_DWN_STRM_PORT_TYPE_MASK;
+ if (type == DP_DWN_STRM_PORT_TYPE_ANALOG ||
+ type == DP_DWN_STRM_PORT_TYPE_OTHER)
+ return connector_status_unknown;
+ }
+
+ /* Anything else is out of spec, warn and ignore */
+ DRM_DEBUG_KMS("Broken DP branch device, ignoring\n");
+ return connector_status_disconnected;
+}
+
/*
* According to DP spec
* 5.1.2:
@@ -4362,21 +4412,22 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
- if (!intel_encoder->base.crtc)
+ /* 4.2.2.8 requires source to read link_status, 0 - 12 DPCD &
+ * sink_count even for short pulse irrespective of the sink is
+ * in use or not
+ */
+ if (!intel_dp_get_link_status(intel_dp, link_status))
return;
- if (!to_intel_crtc(intel_encoder->base.crtc)->active)
+ /* reuse to read both 0 - 12 DPCD & sink_count */
+ if (intel_dp_detect_dpcd(intel_dp) != 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)) {
+ if (!intel_encoder->base.crtc)
return;
- }
- /* Now read the DPCD to see if it's actually running */
- if (!intel_dp_get_dpcd(intel_dp)) {
+ if (!to_intel_crtc(intel_encoder->base.crtc)->active)
return;
- }
/* Try to read the source of the interrupt */
if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
@@ -4401,56 +4452,6 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
}
}
-/* XXX this is probably wrong for multiple downstream ports */
-static enum drm_connector_status
-intel_dp_detect_dpcd(struct intel_dp *intel_dp)
-{
- uint8_t *dpcd = intel_dp->dpcd;
- uint8_t type;
-
- if (!intel_dp_get_dpcd(intel_dp))
- return connector_status_disconnected;
-
- /* if there's no downstream port, we're done */
- if (!(dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT))
- return connector_status_connected;
-
- /* If we're HPD-aware, SINK_COUNT changes dynamically */
- if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
- intel_dp->downstream_ports[0] & DP_DS_PORT_HPD) {
- uint8_t reg;
-
- if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_SINK_COUNT,
- ®, 1) < 0)
- return connector_status_unknown;
-
- return DP_GET_SINK_COUNT(reg) ? connector_status_connected
- : connector_status_disconnected;
- }
-
- /* If no HPD, poke DDC gently */
- if (drm_probe_ddc(&intel_dp->aux.ddc))
- return connector_status_connected;
-
- /* Well we tried, say unknown for unreliable port types */
- if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11) {
- type = intel_dp->downstream_ports[0] & DP_DS_PORT_TYPE_MASK;
- if (type == DP_DS_PORT_TYPE_VGA ||
- type == DP_DS_PORT_TYPE_NON_EDID)
- return connector_status_unknown;
- } else {
- type = intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
- DP_DWN_STRM_PORT_TYPE_MASK;
- if (type == DP_DWN_STRM_PORT_TYPE_ANALOG ||
- type == DP_DWN_STRM_PORT_TYPE_OTHER)
- return connector_status_unknown;
- }
-
- /* Anything else is out of spec, warn and ignore */
- DRM_DEBUG_KMS("Broken DP branch device, ignoring\n");
- return connector_status_disconnected;
-}
-
static enum drm_connector_status
edp_detect(struct intel_dp *intel_dp)
{
--
1.7.9.5
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