linux-kernel - [PATCH 1/5] media: videodev2: add Compressed Framebuffer pixel formats

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Date:   Thu,  4 Jun 2020 15:53:13 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     hverkuil-cisco@...all.nl
Cc:     linux-media@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Maxime Jourdan <mjourdan@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>
Subject: [PATCH 1/5] media: videodev2: add Compressed Framebuffer pixel formats

From: Maxime Jourdan <mjourdan@...libre.com>

Add two generic Compressed Framebuffer pixel formats to be used
with a modifier when imported back in another subsystem like DRM/KMS.

These pixel formats represents generic 8bits and 10bits compressed buffers
with a vendor specific layout.

These are aligned with the DRM_FORMAT_YUV420_8BIT and DRM_FORMAT_YUV420_10BIT
used to describe the underlying compressed buffers used for ARM Framebuffer
Compression. In the Amlogic case, the compression is different but the
underlying buffer components is the same.

Signed-off-by: Maxime Jourdan <mjourdan@...libre.com>
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/media/v4l2-core/v4l2-ioctl.c | 2 ++
 include/uapi/linux/videodev2.h       | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 2322f08a98be..8f14adfd5bc5 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1447,6 +1447,8 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
 		case V4L2_PIX_FMT_S5C_UYVY_JPG:	descr = "S5C73MX interleaved UYVY/JPEG"; break;
 		case V4L2_PIX_FMT_MT21C:	descr = "Mediatek Compressed Format"; break;
 		case V4L2_PIX_FMT_SUNXI_TILED_NV12: descr = "Sunxi Tiled NV12 Format"; break;
+		case V4L2_PIX_FMT_YUV420_8BIT:	descr = "Compressed YUV 4:2:0 8-bit Format"; break;
+		case V4L2_PIX_FMT_YUV420_10BIT:	descr = "Compressed YUV 4:2:0 10-bit Format"; break;
 		default:
 			if (fmt->description[0])
 				return;
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index c3a1cf1c507f..90b9949acb8a 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -705,6 +705,15 @@ struct v4l2_pix_format {
 #define V4L2_PIX_FMT_FWHT     v4l2_fourcc('F', 'W', 'H', 'T') /* Fast Walsh Hadamard Transform (vicodec) */
 #define V4L2_PIX_FMT_FWHT_STATELESS     v4l2_fourcc('S', 'F', 'W', 'H') /* Stateless FWHT (vicodec) */
 
+/*
+ * Compressed Luminance+Chrominance meta-formats
+ * In these formats, the component ordering is specified (Y, followed by U
+ * then V), but the exact Linear layout is undefined.
+ * These formats can only be used with a non-Linear modifier.
+ */
+#define V4L2_PIX_FMT_YUV420_8BIT	v4l2_fourcc('Y', 'U', '0', '8') /* 1-plane YUV 4:2:0 8-bit */
+#define V4L2_PIX_FMT_YUV420_10BIT	v4l2_fourcc('Y', 'U', '1', '0') /* 1-plane YUV 4:2:0 10-bit */
+
 /*  Vendor-specific formats   */
 #define V4L2_PIX_FMT_CPIA1    v4l2_fourcc('C', 'P', 'I', 'A') /* cpia1 YUV */
 #define V4L2_PIX_FMT_WNVA     v4l2_fourcc('W', 'N', 'V', 'A') /* Winnov hw compress */
-- 
2.22.0