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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: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Thulasimani,Sivakumar 2015-07-31 11:05:27 +05:30 committed by Daniel Vetter
parent d37ae19a6c
commit 22ce5628a1
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/i915/intel_dp.c
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@ -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;