Add a generic helper to fill in an HDMI AVI infoframe with data
extracted from a DRM display mode.
Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
---
Changes in v2:
- reuse CEA modes defined in drm_edid_modes.h
- don't use pixel aspect ratio for picture aspect
Changes in v3:
- move implementation into drm_edid.[ch]
drivers/gpu/drm/Kconfig | 1 +
drivers/gpu/drm/drm_edid.c | 33 +++++++++++++++++++++++++++++++++
include/drm/drm_edid.h | 6 ++++++
3 files changed, 40 insertions(+)
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 983201b..92d2294 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -7,6 +7,7 @@
menuconfig DRM
tristate "Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)"
depends on (AGP || AGP=n) && !EMULATED_CMPXCHG && MMU
+ select HDMI
select I2C
select I2C_ALGOBIT
select DMA_SHARED_BUFFER
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 5a3770f..1cfafc0 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -29,6 +29,7 @@
*/
#include <linux/kernel.h>
#include <linux/slab.h>
+#include <linux/hdmi.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <drm/drmP.h>
@@ -2098,3 +2099,35 @@ uint8_t drm_mode_cea_vic(const struct drm_display_mode *mode)
return 0;
}
EXPORT_SYMBOL(drm_mode_cea_vic);
+
+/**
+ * drm_hdmi_avi_infoframe_from_display_mode() - fill an HDMI AVI infoframe with
+ * data from a DRM display mode
+ * @frame: HDMI AVI infoframe
+ * @mode: DRM display mode
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int
+drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
+ const struct drm_display_mode *mode)
+{
+ int err;
+
+ if (!frame || !mode)
+ return -EINVAL;
+
+ err = hdmi_avi_infoframe_init(frame);
+ if (err < 0)
+ return err;
+
+ frame->video_code = drm_match_cea_mode(mode);
+ if (!frame->video_code)
+ return 0;
+
+ frame->picture_aspect = HDMI_PICTURE_ASPECT_NONE;
+ frame->active_aspect = HDMI_ACTIVE_ASPECT_PICTURE;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_hdmi_avi_infoframe_from_display_mode);
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 0cac551..5da1b4a 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -247,6 +247,8 @@ struct edid {
struct drm_encoder;
struct drm_connector;
struct drm_display_mode;
+struct hdmi_avi_infoframe;
+
void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid);
int drm_av_sync_delay(struct drm_connector *connector,
struct drm_display_mode *mode);
@@ -254,4 +256,8 @@ struct drm_connector *drm_select_eld(struct drm_encoder *encoder,
struct drm_display_mode *mode);
int drm_load_edid_firmware(struct drm_connector *connector);
+int
+drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
+ const struct drm_display_mode *mode);
+
#endif /* __DRM_EDID_H__ */
--
1.8.1
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