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drm/edid: Add drm_rgb_quant_range_selectable()

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drm_rgb_quant_range_selectable() will report whether the monitor
claims to support for RGB quantization range selection.

The information can be found in the CEA Video capability block.

v2: s/quantzation/quantization/ in the comment

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: David Airlie <airlied@linux.ie>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2013-01-17 16:31:30 +02:00 committed by Daniel Vetter
parent 55bc60db59
commit b1edd6a6ec
2 changed files with 34 additions and 0 deletions
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33
drivers/gpu/drm/drm_edid.c
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@ -1483,9 +1483,11 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid,
#define VIDEO_BLOCK 0x02
#define VENDOR_BLOCK 0x03
#define SPEAKER_BLOCK 0x04
#define VIDEO_CAPABILITY_BLOCK 0x07
#define EDID_BASIC_AUDIO (1 << 6)
#define EDID_CEA_YCRCB444 (1 << 5)
#define EDID_CEA_YCRCB422 (1 << 4)
#define EDID_CEA_VCDB_QS (1 << 6)
/**
* Search EDID for CEA extension block.
@ -1901,6 +1903,37 @@ end:
}
EXPORT_SYMBOL(drm_detect_monitor_audio);
/**
* drm_rgb_quant_range_selectable - is RGB quantization range selectable?
*
* Check whether the monitor reports the RGB quantization range selection
* as supported. The AVI infoframe can then be used to inform the monitor
* which quantization range (full or limited) is used.
*/
bool drm_rgb_quant_range_selectable(struct edid *edid)
{
u8 *edid_ext;
int i, start, end;
edid_ext = drm_find_cea_extension(edid);
if (!edid_ext)
return false;
if (cea_db_offsets(edid_ext, &start, &end))
return false;
for_each_cea_db(edid_ext, i, start, end) {
if (cea_db_tag(&edid_ext[i]) == VIDEO_CAPABILITY_BLOCK &&
cea_db_payload_len(&edid_ext[i]) == 2) {
DRM_DEBUG_KMS("CEA VCDB 0x%02x\n", edid_ext[i + 2]);
return edid_ext[i + 2] & EDID_CEA_VCDB_QS;
}
}
return false;
}
EXPORT_SYMBOL(drm_rgb_quant_range_selectable);
/**
* drm_add_display_info - pull display info out if present
* @edid: EDID data

1
include/drm/drm_crtc.h
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@ -1033,6 +1033,7 @@ extern u8 *drm_find_cea_extension(struct edid *edid);
extern u8 drm_match_cea_mode(struct drm_display_mode *to_match);
extern bool drm_detect_hdmi_monitor(struct edid *edid);
extern bool drm_detect_monitor_audio(struct edid *edid);
extern bool drm_rgb_quant_range_selectable(struct edid *edid);
extern int drm_mode_page_flip_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv);
extern struct drm_display_mode *drm_cvt_mode(struct drm_device *dev,