drm: get cea video id code for a given display mode
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>
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@ -1516,6 +1516,26 @@ u8 *drm_find_cea_extension(struct edid *edid)
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}
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EXPORT_SYMBOL(drm_find_cea_extension);
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/*
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* Looks for a CEA mode matching given drm_display_mode.
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* Returns its CEA Video ID code, or 0 if not found.
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*/
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u8 drm_match_cea_mode(struct drm_display_mode *to_match)
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{
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struct drm_display_mode *cea_mode;
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u8 mode;
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for (mode = 0; mode < drm_num_cea_modes; mode++) {
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cea_mode = (struct drm_display_mode *)&edid_cea_modes[mode];
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if (drm_mode_equal(to_match, cea_mode))
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return mode + 1;
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}
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return 0;
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}
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EXPORT_SYMBOL(drm_match_cea_mode);
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static int
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do_cea_modes (struct drm_connector *connector, u8 *db, u8 len)
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{
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@ -1037,6 +1037,7 @@ extern int drm_mode_gamma_get_ioctl(struct drm_device *dev,
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extern int drm_mode_gamma_set_ioctl(struct drm_device *dev,
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void *data, struct drm_file *file_priv);
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extern u8 *drm_find_cea_extension(struct edid *edid);
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extern u8 drm_match_cea_mode(struct drm_display_mode *to_match);
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extern bool drm_detect_hdmi_monitor(struct edid *edid);
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extern bool drm_detect_monitor_audio(struct edid *edid);
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extern int drm_mode_page_flip_ioctl(struct drm_device *dev,
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