[PATCH v2 2/3] drm/i915: Disable LTTPR support when the DPCD rev < 1.4

[Imre Deak <imre.deak@intel.com>]

By the specification the 0xF0000-0xF02FF range is only valid when the
DPCD revision is 1.4 or higher. Disable LTTPR support if this isn't so.

Trying to detect LTTPRs returned corrupted values for the above DPCD
range at least on a Skylake host with an LG 43UD79-B monitor with a DPCD
revision 1.2 connected.

Fixes: 7b2a4ab8b0ef ("drm/i915: Switch to LTTPR transparent mode link training")
Cc: <stable@vger.kernel.org> # v5.11
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c       |  4 +-
 .../drm/i915/display/intel_dp_link_training.c | 39 +++++++++++++------
 .../drm/i915/display/intel_dp_link_training.h |  2 +-
 3 files changed, 30 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index b6b5776f5a66..873684da0cd4 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -3711,9 +3711,7 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
 {
 	int ret;
 
-	intel_dp_lttpr_init(intel_dp);
-
-	if (drm_dp_read_dpcd_caps(&intel_dp->aux, intel_dp->dpcd))
+	if (intel_dp_init_lttpr_and_dprx_caps(intel_dp) < 0)
 		return false;
 
 	/*
diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
index c0e25c75c105..d8d90903226f 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -35,6 +35,11 @@ intel_dp_dump_link_status(struct drm_device *drm,
 		    link_status[3], link_status[4], link_status[5]);
 }
 
+static void intel_dp_reset_lttpr_common_caps(struct intel_dp *intel_dp)
+{
+	memset(&intel_dp->lttpr_common_caps, 0, sizeof(intel_dp->lttpr_common_caps));
+}
+
 static void intel_dp_reset_lttpr_count(struct intel_dp *intel_dp)
 {
 	intel_dp->lttpr_common_caps[DP_PHY_REPEATER_CNT -
@@ -96,8 +101,7 @@ static bool intel_dp_read_lttpr_common_caps(struct intel_dp *intel_dp)
 
 	if (drm_dp_read_lttpr_common_caps(&intel_dp->aux,
 					  intel_dp->lttpr_common_caps) < 0) {
-		memset(intel_dp->lttpr_common_caps, 0,
-		       sizeof(intel_dp->lttpr_common_caps));
+		intel_dp_reset_lttpr_common_caps(intel_dp);
 		return false;
 	}
 
@@ -119,27 +123,37 @@ intel_dp_set_lttpr_transparent_mode(struct intel_dp *intel_dp, bool enable)
 }
 
 /**
- * intel_dp_lttpr_init - detect LTTPRs and init the LTTPR link training mode
+ * intel_dp_init_lttpr_and_dprx_caps - detect LTTPR and DPRX caps, init the LTTPR link training mode
  * @intel_dp: Intel DP struct
  *
- * Read the LTTPR common capabilities, switch to non-transparent link training
- * mode if any is detected and read the PHY capabilities for all detected
- * LTTPRs. In case of an LTTPR detection error or if the number of
+ * Read the LTTPR common and DPRX capabilities and switch to non-transparent
+ * link training mode if any is detected and read the PHY capabilities for all
+ * detected LTTPRs. In case of an LTTPR detection error or if the number of
  * LTTPRs is more than is supported (8), fall back to the no-LTTPR,
  * transparent mode link training mode.
  *
  * Returns:
- *   >0  if LTTPRs were detected and the non-transparent LT mode was set
+ *   >0  if LTTPRs were detected and the non-transparent LT mode was set. The
+ *       DPRX capabilities are read out.
  *    0  if no LTTPRs or more than 8 LTTPRs were detected or in case of a
- *       detection failure and the transparent LT mode was set
+ *       detection failure and the transparent LT mode was set. The DPRX
+ *       capabilities are read out.
+ *   <0  Reading out the DPRX capabilities failed.
  */
-int intel_dp_lttpr_init(struct intel_dp *intel_dp)
+int intel_dp_init_lttpr_and_dprx_caps(struct intel_dp *intel_dp)
 {
 	int lttpr_count;
 	bool ret;
 	int i;
 
 	ret = intel_dp_read_lttpr_common_caps(intel_dp);
+
+	/* The DPTX shall read the DRPX caps after LTTPR detection. */
+	if (drm_dp_read_dpcd_caps(&intel_dp->aux, intel_dp->dpcd)) {
+		intel_dp_reset_lttpr_common_caps(intel_dp);
+		return -EIO;
+	}
+
 	if (!ret)
 		return 0;
 
@@ -182,7 +196,7 @@ int intel_dp_lttpr_init(struct intel_dp *intel_dp)
 
 	return lttpr_count;
 }
-EXPORT_SYMBOL(intel_dp_lttpr_init);
+EXPORT_SYMBOL(intel_dp_init_lttpr_and_dprx_caps);
 
 static u8 dp_voltage_max(u8 preemph)
 {
@@ -817,7 +831,10 @@ void intel_dp_start_link_train(struct intel_dp *intel_dp,
 	 * TODO: Reiniting LTTPRs here won't be needed once proper connector
 	 * HW state readout is added.
 	 */
-	int lttpr_count = intel_dp_lttpr_init(intel_dp);
+	int lttpr_count = intel_dp_init_lttpr_and_dprx_caps(intel_dp);
+
+	if (lttpr_count < 0)
+		return;
 
 	if (!intel_dp_link_train_all_phys(intel_dp, crtc_state, lttpr_count))
 		intel_dp_schedule_fallback_link_training(intel_dp, crtc_state);
diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.h b/drivers/gpu/drm/i915/display/intel_dp_link_training.h
index 6a1f76bd8c75..9cb7c28027f0 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.h
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.h
@@ -11,7 +11,7 @@
 struct intel_crtc_state;
 struct intel_dp;
 
-int intel_dp_lttpr_init(struct intel_dp *intel_dp);
+int intel_dp_init_lttpr_and_dprx_caps(struct intel_dp *intel_dp);
 
 void intel_dp_get_adjust_train(struct intel_dp *intel_dp,
 			       const struct intel_crtc_state *crtc_state,
-- 
2.25.1