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drm: get cea video id code for a given display mode

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This patch adds support for getting CEA Video ID Code for a given
display mode after matching with edid_cea_modes list. Its index in
the list added with one, gives the desired code.

This exported function will be used by hdmi drivers for composing
AVI info frame data.

Signed-off-by: Stephane Marchesin <marcheu@chromium.org>
Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Stephane Marchesin 2012-11-09 16:21:05 +00:00 committed by Dave Airlie
parent 96081cdfae
commit a4799037c3
2 changed files with 21 additions and 0 deletions
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20
drivers/gpu/drm/drm_edid.c
View File

@ -1516,6 +1516,26 @@ u8 *drm_find_cea_extension(struct edid *edid)
} }
EXPORT_SYMBOL(drm_find_cea_extension); EXPORT_SYMBOL(drm_find_cea_extension);
/*
* Looks for a CEA mode matching given drm_display_mode.
* Returns its CEA Video ID code, or 0 if not found.
*/
u8 drm_match_cea_mode(struct drm_display_mode *to_match)
{
struct drm_display_mode *cea_mode;
u8 mode;
for (mode = 0; mode < drm_num_cea_modes; mode++) {
cea_mode = (struct drm_display_mode *)&edid_cea_modes[mode];
if (drm_mode_equal(to_match, cea_mode))
return mode + 1;
}
return 0;
}
EXPORT_SYMBOL(drm_match_cea_mode);
static int static int
do_cea_modes (struct drm_connector *connector, u8 *db, u8 len) do_cea_modes (struct drm_connector *connector, u8 *db, u8 len)
{ {

1
include/drm/drm_crtc.h
View File

@ -1037,6 +1037,7 @@ extern int drm_mode_gamma_get_ioctl(struct drm_device *dev,
extern int drm_mode_gamma_set_ioctl(struct drm_device *dev, extern int drm_mode_gamma_set_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv); void *data, struct drm_file *file_priv);
extern u8 *drm_find_cea_extension(struct edid *edid); 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_hdmi_monitor(struct edid *edid);
extern bool drm_detect_monitor_audio(struct edid *edid); extern bool drm_detect_monitor_audio(struct edid *edid);
extern int drm_mode_page_flip_ioctl(struct drm_device *dev, extern int drm_mode_page_flip_ioctl(struct drm_device *dev,