linux-kernel - [PATCHv3 1/1] media: imx: Round line size to 4 bytes

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Message-ID: <20220914173236.3040f3a1.dorota.czaplejewicz@puri.sm>
Date:   Wed, 14 Sep 2022 18:11:51 +0200
From:   Dorota Czaplejewicz <dorota.czaplejewicz@...i.sm>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Steve Longerbeam <slongerbeam@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...i.sm, phone-devel@...r.kernel.org
Subject: [PATCHv3 1/1] media: imx: Round line size to 4 bytes

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@...i.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


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