Revision - 210a021 - drm/edid: Set 8 bpc color depth for displays with "DFP 1.x [...] - origin: https://github.com/torvalds/linux

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29 July 2024, 15:18:00 UTC

Revision 210a021dab639694600450c14b877bf3e3240adc authored by Mario Kleiner on 06 July 2016, 10:05:48 UTC, committed by Dave Airlie on 08 August 2016, 22:56:04 UTC

drm/edid: Set 8 bpc color depth for displays with "DFP 1.x compliant TMDS".

According to E-EDID spec 1.3, table 3.9, a digital video sink with the
"DFP 1.x compliant TMDS" bit set is "signal compatible with VESA DFP 1.x
TMDS CRGB, 1 pixel / clock, up to 8 bits / color MSB aligned".

For such displays, the DFP spec 1.0, section 3.10 "EDID support" says:

"If the DFP monitor only supports EDID 1.X (1.1, 1.2, etc.)
 without extensions, the host will make the following assumptions:

 1. 24-bit MSB-aligned RGB TFT
 2. DE polarity is active high
 3. H and V syncs are active high
 4. Established CRT timings will be used
 5. Dithering will not be enabled on the host"

So if we don't know the bit depth of the display from additional
colorimetry info we should assume 8 bpc / 24 bpp by default.

This patch adds info->bpc = 8 assignement for that case.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 parent 196f954

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Tip revision: 210a021dab639694600450c14b877bf3e3240adc authored by Mario Kleiner on 06 July 2016, 10:05:48 UTC
drm/edid: Set 8 bpc color depth for displays with "DFP 1.x compliant TMDS".

Tip revision: 210a021

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drm/edid: Set 8 bpc color depth for displays with "DFP 1.x compliant TMDS".

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