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drm/i915: don't use uninitialized EDID bpc values when picking pipe bpp

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The EDID parser will zero out the bpc value, and the driver needs to handle
that case.  In our picker, we'll just ignore 0 values as far as bpp
picking goes.

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=39323.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Jesse Barnes 2011-07-28 12:55:14 -07:00 committed by Keith Packard
parent 9b546e571b
commit 62ac41a6e4
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/i915/intel_display.c
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@ -4600,7 +4600,9 @@ static bool intel_choose_pipe_bpp_dither(struct drm_crtc *crtc,
if (connector->encoder != encoder)
continue;
if (connector->display_info.bpc < display_bpc) {
/* Don't use an invalid EDID bpc value */
if (connector->display_info.bpc &&
connector->display_info.bpc < display_bpc) {
DRM_DEBUG_DRIVER("clamping display bpc (was %d) to EDID reported max of %d\n", display_bpc, connector->display_info.bpc);
display_bpc = connector->display_info.bpc;
}
@ -5215,7 +5217,8 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
temp |= PIPE_12BPC;
break;
default:
WARN(1, "intel_choose_pipe_bpp returned invalid value\n");
WARN(1, "intel_choose_pipe_bpp returned invalid value %d\n",
pipe_bpp);
temp |= PIPE_8BPC;
pipe_bpp = 24;
break;