From: Stephane Marchesin <marcheu@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Signed-off-by: Rahul Sharma <rahul.sharma@xxxxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 20 ++++++++++++++++++++
include/drm/drm_crtc.h | 1 +
2 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index fadcd44..856dcd9 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1516,6 +1516,26 @@ u8 *drm_find_cea_extension(struct edid *edid)
}
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
do_cea_modes (struct drm_connector *connector, u8 *db, u8 len)
{
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 92889be..467a327 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1038,6 +1038,7 @@ extern int drm_mode_gamma_get_ioctl(struct drm_device *dev,
extern int drm_mode_gamma_set_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv);
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 int drm_mode_page_flip_ioctl(struct drm_device *dev,
--
1.7.0.4
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