[PATCHv3 1/1 RESEND] media: imx: Round line size to 4 bytes

Dorota Czaplejewicz
2022-10-16T14:41:02Z

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Section 13.7.6.13 "CSI Image Parameter Register" of the
i.MX 8M Quad Applications Processors Reference Manual
states that the line size should be divisible by 8 bytes.
However, the hardware also accepts sizes divisible by 4 bytes,
which are needed to fully utilize the S5K3L6XX sensors.

This patch accepts line sizes divisible by 4 bytes.

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

the Librem 5 is using an out-of-tree driver for s5k3l6xx, and rounding to 4 is optimal to operate it.

This revision improves the commit message.

Cheers,
Dorota Czaplejewicz

drivers/staging/media/imx/imx7-media-csi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/imx/imx7-media-csi.c b/drivers/staging/media/imx/imx7-media-csi.c
index a0553c24cce4..af821b410c3f 100644
--- a/drivers/staging/media/imx/imx7-media-csi.c
+++ b/drivers/staging/media/imx/imx7-media-csi.c
@@ -999,10 +999,10 @@ static int imx7_csi_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
}

/* Round up width for minimum burst size */
- width = round_up(mbus->width, 8);
+ width = round_up(mbus->width, 4);

/* Round up stride for IDMAC line start address alignment */
- stride = round_up((width * cc->bpp) >> 3, 8);
+ stride = round_up((width * cc->bpp) >> 3, 4);

pix->width = width;
pix->height = mbus->height;
--
2.37.3