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drm/i915/dp: fall back to 18 bpp when sink capability is unknown

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commit 5efd407674 upstream.

Per DP spec, the source device should fall back to 18 bpp, VESA range
RGB when the sink capability is unknown. Fix the color depth
clamping. 18 bpp color depth should ensure full color range in automatic
mode.

The clamping has been HDMI specific since its introduction in

commit 996a2239f9
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Fri Apr 19 11:24:34 2013 +0200

    drm/i915: Disable high-bpc on pre-1.4 EDID screens

Reported-and-tested-by: Dihan Wickremasuriya <nayomal@gmail.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=105331
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1452695720-7076-1-git-send-email-jani.nikula@intel.com
(cherry picked from commit 013dd9e038)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jani Nikula
2016-01-13 16:35:20 +02:00
committed by Greg Kroah-Hartman
parent f39741673c
commit 6de4682d28
1 changed files with 15 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/gpu/drm/i915/intel_display.c
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@@ -11930,11 +11930,21 @@ connected_sink_compute_bpp(struct intel_connector *connector,
pipe_config->pipe_bpp = connector->base.display_info.bpc*3;
}
/* Clamp bpp to 8 on screens without EDID 1.4 */
if (connector->base.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;
/* Clamp bpp to default limit on screens without EDID 1.4 */
if (connector->base.display_info.bpc == 0) {
int type = connector->base.connector_type;
int clamp_bpp = 24;
/* Fall back to 18 bpp when DP sink capability is unknown. */
if (type == DRM_MODE_CONNECTOR_DisplayPort ||
type == DRM_MODE_CONNECTOR_eDP)
clamp_bpp = 18;
if (bpp > clamp_bpp) {
DRM_DEBUG_KMS("clamping display bpp (was %d) to default limit of %d\n",
bpp, clamp_bpp);
pipe_config->pipe_bpp = clamp_bpp;
}
}
}