On Fri, Apr 19, 2013 at 11:24:34AM +0200, Daniel Vetter wrote:
> 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!
>
> Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
Reviewed-by: Ville Syrj?l? <ville.syrjala at linux.intel.com>
> ---
> drivers/gpu/drm/i915/intel_display.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 6e265b0..1e6efab 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -7612,6 +7612,13 @@ 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;
> --
> 1.7.11.7
>
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--
Ville Syrj?l?
Intel OTC
