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drm/i915: reject modes the LPT FDI receiver can't handle

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More specifically, the LPT FDI RX only supports 8bpc and a maximum of
2 lanes, so anything above that won't work and should be rejected.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Paulo Zanoni
2012-11-29 11:29:32 -02:00
committed by Daniel Vetter
parent 248138b598
commit d4b1931c14
3 changed files with 20 additions and 9 deletions
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5
drivers/gpu/drm/i915/intel_crt.c
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@@ -198,6 +198,11 @@ static int intel_crt_mode_valid(struct drm_connector *connector,
if (mode->clock > max_clock)
return MODE_CLOCK_HIGH;
/* The FDI receiver on LPT only supports 8bpc and only has 2 lanes. */
if (HAS_PCH_LPT(dev) &&
(ironlake_get_lanes_required(mode->clock, 270000, 24) > 2))
return MODE_CLOCK_HIGH;
return MODE_OK;
}