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path: root/drivers/gpu/drm/i915/intel_dp.c
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Diffstat (limited to 'drivers/gpu/drm/i915/intel_dp.c')
-rw-r--r--drivers/gpu/drm/i915/intel_dp.c18
1 files changed, 4 insertions, 14 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index fc3bd9b4037c..0ab9813a79b5 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -702,6 +702,9 @@ intel_dp_compute_config(struct intel_encoder *encoder,
702 /* Walk through all bpp values. Luckily they're all nicely spaced with 2 702 /* Walk through all bpp values. Luckily they're all nicely spaced with 2
703 * bpc in between. */ 703 * bpc in between. */
704 bpp = min_t(int, 8*3, pipe_config->pipe_bpp); 704 bpp = min_t(int, 8*3, pipe_config->pipe_bpp);
705 if (is_edp(intel_dp) && dev_priv->edp.bpp)
706 bpp = min_t(int, bpp, dev_priv->edp.bpp);
707
705 for (; bpp >= 6*3; bpp -= 2*3) { 708 for (; bpp >= 6*3; bpp -= 2*3) {
706 mode_rate = intel_dp_link_required(target_clock, bpp); 709 mode_rate = intel_dp_link_required(target_clock, bpp);
707 710
@@ -739,6 +742,7 @@ found:
739 intel_dp->link_bw = bws[clock]; 742 intel_dp->link_bw = bws[clock];
740 intel_dp->lane_count = lane_count; 743 intel_dp->lane_count = lane_count;
741 adjusted_mode->clock = drm_dp_bw_code_to_link_rate(intel_dp->link_bw); 744 adjusted_mode->clock = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
745 pipe_config->pipe_bpp = bpp;
742 pipe_config->pixel_target_clock = target_clock; 746 pipe_config->pixel_target_clock = target_clock;
743 747
744 DRM_DEBUG_KMS("DP link bw %02x lane count %d clock %d bpp %d\n", 748 DRM_DEBUG_KMS("DP link bw %02x lane count %d clock %d bpp %d\n",
@@ -751,20 +755,6 @@ found:
751 target_clock, adjusted_mode->clock, 755 target_clock, adjusted_mode->clock,
752 &pipe_config->dp_m_n); 756 &pipe_config->dp_m_n);
753 757
754 /*
755 * XXX: We have a strange regression where using the vbt edp bpp value
756 * for the link bw computation results in black screens, the panel only
757 * works when we do the computation at the usual 24bpp (but still
758 * requires us to use 18bpp). Until that's fully debugged, stay
759 * bug-for-bug compatible with the old code.
760 */
761 if (is_edp(intel_dp) && dev_priv->edp.bpp) {
762 DRM_DEBUG_KMS("clamping display bpc (was %d) to eDP (%d)\n",
763 bpp, dev_priv->edp.bpp);
764 bpp = min_t(int, bpp, dev_priv->edp.bpp);
765 }
766 pipe_config->pipe_bpp = bpp;
767
768 return true; 758 return true;
769} 759}
770 760