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Commit 22ce5628 authored by Thulasimani,Sivakumar's avatar Thulasimani,Sivakumar Committed by Daniel Vetter
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drm/i915: read bpp from vbt only for older panels 



BPP bits defined in VBT should be used only on panels whose
edid version is 1.3 or older. EDID version 1.4 introduced offsets
where bpp is defined and read into display_info, hence bpp from
VBT will be used only when bpc in display_info is zero.

v2: use display_info.bpc for deciding when to use vbt_bpp (Jani)

Signed-off-by: default avatarSivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Reviewed-by: default avatarJani Nikula <jani.nikula@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent d37ae19a

drivers/gpu/drm/i915/intel_dp.c

+4 −1
Original line number Diff line number Diff line
@@ -1409,7 +1409,10 @@ intel_dp_compute_config(struct intel_encoder *encoder, 
	 * bpc in between. */

	bpp = pipe_config->pipe_bpp;

	if (is_edp(intel_dp)) {

		if (dev_priv->vbt.edp_bpp && dev_priv->vbt.edp_bpp < bpp) {



		/* Get bpp from vbt only for panels that dont have bpp in edid */

		if (intel_connector->base.display_info.bpc == 0 &&

			(dev_priv->vbt.edp_bpp && dev_priv->vbt.edp_bpp < bpp)) {

			DRM_DEBUG_KMS("clamping bpp for eDP panel to BIOS-provided %i\n",

				      dev_priv->vbt.edp_bpp);

			bpp = dev_priv->vbt.edp_bpp;