[Intel-gfx] [PATCH v2] drm/i915/dp: Validate cached link rate and lane count before retraining

[Manasi Navare]

Currently intel_dp_check_link_status() tries to retrain the link if
Clock recovery or Channel EQ for any of the lanes indicated by
intel_dp->lane_count is not set. However these values cached in intel_dp
structure can be stale if link training has failed for these values
during previous modeset. Or these values can get stale since we have
now re read the DPCD registers or it can be 0 in case of connected boot
case.

This patch validates these values against the common_rates and max lane
count values.

This is absolutely required incase the common_rates or max lane count
are now different due to link fallback.

v2:
* Include the FIXME commnet inside the function (Ville Syrjala)
* Remove the redundant parenthesis (Ville Syrjala)

Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index fd96a6c..d0ab307 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -295,6 +295,27 @@ static int intel_dp_link_rate_index(struct intel_dp *intel_dp,
 	return -1;
 }
 
+static bool intel_dp_link_params_is_valid(struct intel_dp *intel_dp)
+{
+	int common_rates[DP_MAX_SUPPORTED_RATES];
+	int link_rate_index;
+
+	/* FIXME: we need to synchronize the current link parameters with
+	 * hardware readout. Currently fast link training doesn't work
+	 * on boot-up.
+	 */
+	link_rate_index = intel_dp_link_rate_index(intel_dp,
+						   common_rates,
+						   intel_dp->link_rate);
+	if (link_rate_index < 0)
+		return false;
+	if (!intel_dp->lane_count ||
+	    intel_dp->lane_count > intel_dp_max_lane_count(intel_dp))
+		return false;
+
+	return true;
+}
+
 int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp,
 					    int link_rate, uint8_t lane_count)
 {
@@ -4224,9 +4245,10 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
 	if (!to_intel_crtc(intel_encoder->base.crtc)->active)
 		return;
 
-	/* FIXME: we need to synchronize this sort of stuff with hardware
-	 * readout. Currently fast link training doesn't work on boot-up. */
-	if (!intel_dp->lane_count)
+	/* Validate the cached values of intel_dp->link_rate and
+	 * intel_dp->lane_count before attempting to retrain.
+	 */
+	if (!intel_dp_link_params_is_valid(intel_dp))
 		return;
 
 	/* Retrain if Channel EQ or CR not ok */
-- 
2.1.4