It adds an unpack function for DRM infoframe for dynamic range and
mastering infoframe readout. It unpacks CTA-861-G DRM infoframe DataBytes
contained in the binary buffer into a structured frame of the HDMI Dynamic
Range and Mastering (DRM) infoframe.
CTA-861-G DRM infoframe spec is used for HDR Metadata representation of
HDMI and DisplayPort. Each of HDMI and DP have different header structure,
but they use same payload(DataBytes) structure of CTA-861-G DRM infoframe.
Therefore it only provides unpacking of DRM infoframe payload in order to
use on both HDMI and DP.
v8: Addressed review comments from Laurent Pinchart
- Rename hdmi_drm_infoframe_unpack_only() to
cta_drm_infoframe_unpack_databytes()
- Add clear comments to cta_drm_infoframe_unpack_databytes()
Signed-off-by: Gwan-gyeong Mun <gwan-gyeong....@intel.com>
Reviewed-by: Uma Shankar <uma.shan...@intel.com>
Cc: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
---
drivers/video/hdmi.c | 74 ++++++++++++++++++++++++++++++--------------
include/linux/hdmi.h | 2 ++
2 files changed, 52 insertions(+), 24 deletions(-)
diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
index 856a8c4e84a2..88014c0bbe7c 100644
--- a/drivers/video/hdmi.c
+++ b/drivers/video/hdmi.c
@@ -1768,20 +1768,21 @@ hdmi_vendor_any_infoframe_unpack(union
hdmi_vendor_any_infoframe *frame,
}
/**
- * hdmi_drm_infoframe_unpack() - unpack binary buffer to a HDMI DRM infoframe
+ * cta_drm_infoframe_unpack_databytes() - unpack binary buffer of CTA-861-G
+ * DRM infoframe DataBytes to a HDMI
+ * DRM infoframe
* @frame: HDMI DRM infoframe
* @buffer: source buffer
* @size: size of buffer
*
- * Unpacks the information contained in binary @buffer into a structured
- * @frame of the HDMI Dynamic Range and Mastering (DRM) information frame.
- * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
- * specification.
+ * Unpacks CTA-861-G DRM infoframe DataBytes contained in the binary
+ * @buffer into a structured @frame of the HDMI Dynamic Range and Mastering
+ * (DRM) infoframe.
*
* Returns 0 on success or a negative error code on failure.
*/
-static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame,
- const void *buffer, size_t size)
+int cta_drm_infoframe_unpack_databytes(struct hdmi_drm_infoframe *frame,
+ const void *buffer, size_t size)
{
const u8 *ptr = buffer;
const u8 *temp;
@@ -1790,23 +1791,9 @@ static int hdmi_drm_infoframe_unpack(struct
hdmi_drm_infoframe *frame,
int ret;
int i;
- if (size < HDMI_INFOFRAME_SIZE(DRM))
+ if (size < HDMI_DRM_INFOFRAME_SIZE)
return -EINVAL;
- if (ptr[0] != HDMI_INFOFRAME_TYPE_DRM ||
- ptr[1] != 1 ||
- ptr[2] != HDMI_DRM_INFOFRAME_SIZE)
- return -EINVAL;
-
- if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(DRM)) != 0)
- return -EINVAL;
-
- ret = hdmi_drm_infoframe_init(frame);
- if (ret)
- return ret;
-
- ptr += HDMI_INFOFRAME_HEADER_SIZE;
-
frame->eotf = ptr[0] & 0x7;
frame->metadata_type = ptr[1] & 0x7;
@@ -1814,7 +1801,7 @@ static int hdmi_drm_infoframe_unpack(struct
hdmi_drm_infoframe *frame,
for (i = 0; i < 3; i++) {
x_lsb = *temp++;
x_msb = *temp++;
- frame->display_primaries[i].x = (x_msb << 8) | x_lsb;
+ frame->display_primaries[i].x = (x_msb << 8) | x_lsb;
y_lsb = *temp++;
y_msb = *temp++;
frame->display_primaries[i].y = (y_msb << 8) | y_lsb;
@@ -1822,7 +1809,6 @@ static int hdmi_drm_infoframe_unpack(struct
hdmi_drm_infoframe *frame,
frame->white_point.x = (ptr[15] << 8) | ptr[14];
frame->white_point.y = (ptr[17] << 8) | ptr[16];
-
frame->max_display_mastering_luminance = (ptr[19] << 8) | ptr[18];
frame->min_display_mastering_luminance = (ptr[21] << 8) | ptr[20];
frame->max_cll = (ptr[23] << 8) | ptr[22];
@@ -1830,6 +1816,46 @@ static int hdmi_drm_infoframe_unpack(struct
hdmi_drm_infoframe *frame,
return 0;
}
+EXPORT_SYMBOL(cta_drm_infoframe_unpack_databytes);
+
+/**
+ * hdmi_drm_infoframe_unpack() - unpack binary buffer to a HDMI DRM infoframe
+ * @frame: HDMI DRM infoframe
+ * @buffer: source buffer
+ * @size: size of buffer
+ *
+ * Unpacks the CTA-861-G DRM infoframe contained in the binary @buffer into
+ * a structured @frame of the HDMI Dynamic Range and Mastering (DRM)
+ * infoframe. It also verifies the checksum as required by section 5.3.5 of
+ * the HDMI 1.4 specification.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame,
+ const void *buffer, size_t size)
+{
+ const u8 *ptr = buffer;
+ int ret;
+
+ if (size < HDMI_INFOFRAME_SIZE(DRM))
+ return -EINVAL;
+
+ if (ptr[0] != HDMI_INFOFRAME_TYPE_DRM ||
+ ptr[1] != 1 ||
+ ptr[2] != HDMI_DRM_INFOFRAME_SIZE)
+ return -EINVAL;
+
+ if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(DRM)) != 0)
+ return -EINVAL;
+
+ ret = hdmi_drm_infoframe_init(frame);
+ if (ret)
+ return ret;
+
+ ret = cta_drm_infoframe_unpack_databytes(frame, ptr +
HDMI_INFOFRAME_HEADER_SIZE,
+ size -
HDMI_INFOFRAME_HEADER_SIZE);
+ return ret;
+}
/**
* hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe
diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
index 9613d796cfb1..43b3a1a0a35b 100644
--- a/include/linux/hdmi.h
+++ b/include/linux/hdmi.h
@@ -219,6 +219,8 @@ ssize_t hdmi_drm_infoframe_pack(struct hdmi_drm_infoframe
*frame, void *buffer,
ssize_t hdmi_drm_infoframe_pack_only(const struct hdmi_drm_infoframe *frame,
void *buffer, size_t size);
int hdmi_drm_infoframe_check(struct hdmi_drm_infoframe *frame);
+int cta_drm_infoframe_unpack_databytes(struct hdmi_drm_infoframe *frame,
+ const void *buffer, size_t size);
enum hdmi_spd_sdi {
HDMI_SPD_SDI_UNKNOWN,
--
2.25.0
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