linux-kernel - [PATCH v6 4/5] media: Add HEXTILE compressed format

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Message-Id: <20221104033810.1324686-5-milkfafa@gmail.com>
Date:   Fri,  4 Nov 2022 11:38:09 +0800
From:   Marvin Lin <milkfafa@...il.com>
To:     mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     openbmc@...ts.ozlabs.org, avifishman70@...il.com,
        tmaimon77@...il.com, tali.perry1@...il.com, kwliu@...oton.com,
        kflin@...oton.com, Marvin Lin <milkfafa@...il.com>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>
Subject: [PATCH v6 4/5] media: Add HEXTILE compressed format

Add HEXTILE compressed format. This format is defined in Remote Framebuffer
Protocol (RFC 6143) and is used by Encoding Compression Engine present on
Nuvoton NPCM SoCs.

Signed-off-by: Marvin Lin <milkfafa@...il.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
---
 Documentation/userspace-api/media/v4l/pixfmt-reserved.rst | 7 +++++++
 drivers/media/v4l2-core/v4l2-ioctl.c                      | 1 +
 include/uapi/linux/videodev2.h                            | 1 +
 3 files changed, 9 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
index 0ff68cd8cf62..b45d8aa2e8b0 100644
--- a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
+++ b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
@@ -258,6 +258,13 @@ please make a proposal on the linux-media mailing list.
         and it is used by various multimedia hardware blocks like GPU, display
         controllers, ISP and video accelerators.
         It contains four planes for progressive video.
+    * .. _V4L2-PIX-FMT-HEXTILE:
+
+      - ``V4L2_PIX_FMT_HEXTILE``
+      - 'HXTL'
+      - Compressed format used by Nuvoton NPCM video driver. This format is
+        defined in Remote Framebuffer Protocol (RFC 6143, chapter 7.7.4 Hextile
+        Encoding).
 .. raw:: latex
 
     \normalsize
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index c314025d977e..bdbbba12f17c 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1497,6 +1497,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
 		case V4L2_PIX_FMT_MT21C:	descr = "Mediatek Compressed Format"; break;
 		case V4L2_PIX_FMT_QC08C:	descr = "QCOM Compressed 8-bit Format"; break;
 		case V4L2_PIX_FMT_QC10C:	descr = "QCOM Compressed 10-bit Format"; break;
+		case V4L2_PIX_FMT_HEXTILE:	descr = "Hextile Compressed Format"; break;
 		default:
 			if (fmt->description[0])
 				return;
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 01e630f2ec78..4241dd4a0bfa 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -776,6 +776,7 @@ struct v4l2_pix_format {
 #define V4L2_PIX_FMT_HI240    v4l2_fourcc('H', 'I', '2', '4') /* BTTV 8-bit dithered RGB */
 #define V4L2_PIX_FMT_QC08C    v4l2_fourcc('Q', '0', '8', 'C') /* Qualcomm 8-bit compressed */
 #define V4L2_PIX_FMT_QC10C    v4l2_fourcc('Q', '1', '0', 'C') /* Qualcomm 10-bit compressed */
+#define V4L2_PIX_FMT_HEXTILE  v4l2_fourcc('H', 'X', 'T', 'L') /* Hextile compression */
 
 /* 10bit raw packed, 32 bytes for every 25 pixels, last LSB 6 bits unused */
 #define V4L2_PIX_FMT_IPU3_SBGGR10	v4l2_fourcc('i', 'p', '3', 'b') /* IPU3 packed 10-bit BGGR bayer */
-- 
2.34.1