Commit b1edd6a6 authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Daniel Vetter
Browse files

drm/edid: Add drm_rgb_quant_range_selectable() 



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: default avatarPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: default avatarDavid Airlie <airlied@linux.ie>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 55bc60db

drivers/gpu/drm/drm_edid.c

+33 −0
Original line number Diff line number Diff line
@@ -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

include/drm/drm_crtc.h

+1 −0
Original line number Diff line number Diff line
@@ -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,

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