linux-kernel - [PATCH] media: Add 16-bit Bayer formats

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Message-ID: <20211019114718.827400-1-dorota.czaplejewicz@puri.sm>
Date:   Tue, 19 Oct 2021 13:59:29 +0200
From:   Dorota Czaplejewicz <dorota.czaplejewicz@...i.sm>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Andrey Konovalov <andrey.konovalov@...aro.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...ism
Subject: [PATCH] media: Add 16-bit Bayer formats

16-bit bayer formats are used by the i.MX driver.

Signed-off-by: Dorota Czaplejewicz <dorota.czaplejewicz@...i.sm>
---
Hello,

While working on the i.MX8 video driver, I discovered that `v4l2_fill_pixfmt` will fail when using 10-bit sensor formats. (For background, see the conversation at https://lkml.org/lkml/2021/10/17/93 .)

It appears that the video hardware will fill a 16-bit-per-pixel buffer when fed 10-bit-per-pixel Bayer data, making `v4l2_fill_pixfmt` effectively broken for this case.

This change adds the relevant entries to the format info structure.

Difference in behaviour observed using the i846 driver on the Librem 5.

Regards,
Dorota Czaplejewicz

 drivers/media/v4l2-core/v4l2-common.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
index 04af03285a20..d2e61538e979 100644
--- a/drivers/media/v4l2-core/v4l2-common.c
+++ b/drivers/media/v4l2-core/v4l2-common.c
@@ -309,6 +309,10 @@ const struct v4l2_format_info *v4l2_format_info(u32 format)
 		{ .format = V4L2_PIX_FMT_SGBRG12,	.pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
 		{ .format = V4L2_PIX_FMT_SGRBG12,	.pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
 		{ .format = V4L2_PIX_FMT_SRGGB12,	.pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
+		{ .format = V4L2_PIX_FMT_SBGGR16,	.pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
+		{ .format = V4L2_PIX_FMT_SGBRG16,	.pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
+		{ .format = V4L2_PIX_FMT_SGRBG16,	.pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
+		{ .format = V4L2_PIX_FMT_SRGGB16,	.pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
 	};
 	unsigned int i;
 
-- 
2.31.1


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