[Intel-gfx] [PATCH v2] drm/i915: Restore correct bxt_ddi_phy_calc_lane_lat_optim_mask() calculation

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

We are no longer calling bxt_ddi_phy_calc_lane_lat_optim_mask() when
intel{hdmi,dp}_compute_config() succeeds, and instead only call it
when those fail. This is fallout from the bool->int
.compute_config() conversion which failed to invert the return
value check before calling bxt_ddi_phy_calc_lane_lat_optim_mask().
Let's just replace it with an early bailout so that it's harder
to miss.

This restores the correct latency optim setting calculation
(which could fix some real failures), and avoids the
MISSING_CASE() from bxt_ddi_phy_calc_lane_lat_optim_mask()
after intel{hdmi,dp}_compute_config() has failed.

Cc: Lyude Paul <lyude at redhat.com>
Fixes: 204474a6b859 ("drm/i915: Pass down rc in intel_encoder->compute_config()")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109373
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_ddi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 3ae55274056c..24f9106efcc6 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -3857,14 +3857,16 @@ static int intel_ddi_compute_config(struct intel_encoder *encoder,
 		ret = intel_hdmi_compute_config(encoder, pipe_config, conn_state);
 	else
 		ret = intel_dp_compute_config(encoder, pipe_config, conn_state);
+	if (ret)
+		return ret;
 
-	if (IS_GEN9_LP(dev_priv) && ret)
+	if (IS_GEN9_LP(dev_priv))
 		pipe_config->lane_lat_optim_mask =
 			bxt_ddi_phy_calc_lane_lat_optim_mask(pipe_config->lane_count);
 
 	intel_ddi_compute_min_voltage_level(dev_priv, pipe_config);
 
-	return ret;
+	return 0;
 
 }
 
-- 
2.21.0