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Message-Id: <20250612-csi-bgr-rgb-v1-2-dc8a309118f8@kernel.org>
Date: Thu, 12 Jun 2025 14:53:40 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Mauro Carvalho Chehab <mchehab@...nel.org>,
Hans Verkuil <hverkuil@...all.nl>, Mats Randgaard <matrandg@...co.com>,
Alain Volmat <alain.volmat@...s.st.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
Hans Verkuil <hans.verkuil@...co.com>,
Dave Stevenson <dave.stevenson@...pberrypi.com>,
Maxime Ripard <mripard@...nel.org>
Subject: [PATCH 2/4] media: uapi: Introduce MEDIA_BUS_FMT_BGR565_1X16
MIPI-CSI2 sends its RGB format on the wire with the blue component
first, then green, then red. MIPI calls that format "RGB", but by v4l2
conventions it would be BGR.
MIPI-CSI2 supports three RGB variants: 444, 555, 565, 666 and 888.
We already have BGR666 and BGR888 media bus formats, we don't have any
CSI transceivers using the 444 and 555 variants, but some transceivers
use the CSI RGB565 format, while using the RGB656 media bus code.
That's a mistake, but since we don't have a BGR656 media bus code we
need to introduce one before fixing it.
Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
.../userspace-api/media/v4l/subdev-formats.rst | 37 ++++++++++++++++++++++
include/uapi/linux/media-bus-format.h | 3 +-
2 files changed, 39 insertions(+), 1 deletion(-)
diff --git a/Documentation/userspace-api/media/v4l/subdev-formats.rst b/Documentation/userspace-api/media/v4l/subdev-formats.rst
index 8e92f784abd8123f9ea950f954a60af56ee76dbe..def0d24ef6cdb1a2ec9395af1468f56adf31a8de 100644
--- a/Documentation/userspace-api/media/v4l/subdev-formats.rst
+++ b/Documentation/userspace-api/media/v4l/subdev-formats.rst
@@ -625,10 +625,47 @@ The following tables list existing packed RGB formats.
- b\ :sub:`4`
- b\ :sub:`3`
- b\ :sub:`2`
- b\ :sub:`1`
- b\ :sub:`0`
+ * .. _MEDIA-BUS-FMT-BGR565-1X16:
+
+ - MEDIA_BUS_FMT_BGR565_1X16
+ - 0x1028
+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ - b\ :sub:`4`
+ - b\ :sub:`3`
+ - b\ :sub:`2`
+ - b\ :sub:`1`
+ - b\ :sub:`0`
+ - g\ :sub:`5`
+ - g\ :sub:`4`
+ - g\ :sub:`3`
+ - g\ :sub:`2`
+ - g\ :sub:`1`
+ - g\ :sub:`0`
+ - r\ :sub:`4`
+ - r\ :sub:`3`
+ - r\ :sub:`2`
+ - r\ :sub:`1`
+ - r\ :sub:`0`
* .. _MEDIA-BUS-FMT-BGR565-2X8-BE:
- MEDIA_BUS_FMT_BGR565_2X8_BE
- 0x1005
-
diff --git a/include/uapi/linux/media-bus-format.h b/include/uapi/linux/media-bus-format.h
index ff62056feed5b6588bfcfdff178f5b68eecd3a26..a73d91876d31844bf8c2da91ddea541181840bd2 100644
--- a/include/uapi/linux/media-bus-format.h
+++ b/include/uapi/linux/media-bus-format.h
@@ -32,17 +32,18 @@
* new pixel codes.
*/
#define MEDIA_BUS_FMT_FIXED 0x0001
-/* RGB - next is 0x1028 */
+/* RGB - next is 0x1029 */
#define MEDIA_BUS_FMT_RGB444_1X12 0x1016
#define MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE 0x1001
#define MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE 0x1002
#define MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE 0x1003
#define MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE 0x1004
#define MEDIA_BUS_FMT_RGB565_1X16 0x1017
+#define MEDIA_BUS_FMT_BGR565_1X16 0x1028
#define MEDIA_BUS_FMT_BGR565_2X8_BE 0x1005
#define MEDIA_BUS_FMT_BGR565_2X8_LE 0x1006
#define MEDIA_BUS_FMT_RGB565_2X8_BE 0x1007
#define MEDIA_BUS_FMT_RGB565_2X8_LE 0x1008
#define MEDIA_BUS_FMT_RGB666_1X18 0x1009
--
2.49.0
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