From: Ville Syrjälä <ville.syrj...@linux.intel.com>
The PCH transcoder registers are only 12 bits wide for the hdisplay
and hblank_start values. On HSW/BDW the CPU side registers are 13
bits wide. intel_mode_valid() only checks against the higher limit
(since we don't know where the mode is to be used), so an extra
check is required against the FDI limits.
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
drivers/gpu/drm/i915/intel_crt.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 95aa29cf2d9c..457b1a2d05b8 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -333,6 +333,10 @@ intel_crt_mode_valid(struct drm_connector *connector,
(ironlake_get_lanes_required(mode->clock, 270000, 24) > 2))
return MODE_CLOCK_HIGH;
+ /* HSW/BDW FDI limited to 4k */
+ if (mode->hdisplay > 4096)
+ return MODE_H_ILLEGAL;
+
return MODE_OK;
}
@@ -375,6 +379,11 @@ static bool hsw_crt_compute_config(struct intel_encoder
*encoder,
if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
return false;
+ /* HSW/BDW FDI limited to 4k */
+ if (adjusted_mode->crtc_hdisplay > 4096 ||
+ adjusted_mode->crtc_hblank_start > 4096)
+ return false;
+
pipe_config->has_pch_encoder = true;
/* LPT FDI RX only supports 8bpc. */
--
2.16.4
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