drm/i915: Bail out of pipe config compute loop on LPT

[cascardo/linux.git] / drivers / gpu / drm / i915 / intel_crt.c

diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 505fc5c..0364292 100644 (file)
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -257,8 +257,14 @@ static bool intel_crt_compute_config(struct intel_encoder *encoder,
                pipe_config->has_pch_encoder = true;
 
        /* LPT FDI RX only supports 8bpc. */
-       if (HAS_PCH_LPT(dev))
+       if (HAS_PCH_LPT(dev)) {
+               if (pipe_config->bw_constrained && pipe_config->pipe_bpp < 24) {
+                       DRM_DEBUG_KMS("LPT only supports 24bpp\n");
+                       return false;
+               }
+
                pipe_config->pipe_bpp = 24;
+       }
 
        /* FDI must always be 2.7 GHz */
        if (HAS_DDI(dev)) {