[Intel-gfx] [PATCH 1/2] drm/i915: Rewrite some some of the FDI lane checks

[ville.syrjala at linux.intel.com]

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

The logic in the FDI lane checks is very hard for my poor brain to
grasp. Rewrite it in a more straightforward way.

Cc: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com>
Cc: Daniel Vetter <daniel at ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c361af6..242a8a7 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5589,14 +5589,13 @@ static bool ironlake_check_fdi_lanes(struct drm_device *dev, enum pipe pipe,
 		}
 		return true;
 	case PIPE_C:
-		if (!pipe_has_enabled_pch(pipe_B_crtc) ||
-		    pipe_B_crtc->config->fdi_lanes <= 2) {
-			if (pipe_config->fdi_lanes > 2) {
-				DRM_DEBUG_KMS("invalid shared fdi lane config on pipe %c: %i lanes\n",
-					      pipe_name(pipe), pipe_config->fdi_lanes);
-				return false;
-			}
-		} else {
+		if (pipe_config->fdi_lanes > 2) {
+			DRM_DEBUG_KMS("only 2 lanes on pipe %c: required %i lanes\n",
+				      pipe_name(pipe), pipe_config->fdi_lanes);
+			return false;
+		}
+		if (pipe_has_enabled_pch(pipe_B_crtc) &&
+		    pipe_B_crtc->config->fdi_lanes > 2) {
 			DRM_DEBUG_KMS("fdi link B uses too many lanes to enable link C\n");
 			return false;
 		}
-- 
2.0.5