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drm/i915: Disable high-bpc on pre-1.4 EDID screens

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Prevents black screens when using 30bpp framebuffers on my
HDMI screens here. The DP input on the same screen though reports a
1.4 EDID with the correct 8bpc limit set.

v2: Actually check for the right thing!

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2013-04-19 11:24:34 +02:00
parent fd0c06420d
commit 996a2239f9
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/i915/intel_display.c
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@ -7694,6 +7694,13 @@ pipe_config_set_bpp(struct drm_crtc *crtc,
bpp, connector->display_info.bpc*3);
pipe_config->pipe_bpp = connector->display_info.bpc*3;
}
/* Clamp bpp to 8 on screens without EDID 1.4 */
if (connector->display_info.bpc == 0 && bpp > 24) {
DRM_DEBUG_KMS("clamping display bpp (was %d) to default limit of 24\n",
bpp);
pipe_config->pipe_bpp = 24;
}
}
return bpp;