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Date:   Wed, 14 Sep 2022 17:32:36 +0200
From:   Dorota Czaplejewicz <dorota.czaplejewicz@puri.sm>
To:     Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Steve Longerbeam <slongerbeam@gmail.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        linux-media@vger.kernel.org, linux-staging@lists.linux.dev,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        kernel@puri.sm, phone-devel@vger.kernel.org
Subject: [PATCHv2 1/1] media: imx: Round line size to 4 bytes
Message-ID: <20220914173236.3040f3a1.dorota.czaplejewicz@puri.sm>
Organization: Purism
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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 4-bytes in non-planar mode.

---
Hello,

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

Please ignore my previous series, I sent it by mistake.

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/m=
edia/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_p=
ix_format *pix,
 	}
=20
 	/* Round up width for minimum burst size */
-	width =3D round_up(mbus->width, 8);
+	width =3D round_up(mbus->width, 4);
=20
 	/* Round up stride for IDMAC line start address alignment */
-	stride =3D round_up((width * cc->bpp) >> 3, 8);
+	stride =3D round_up((width * cc->bpp) >> 3, 4);
=20
 	pix->width =3D width;
 	pix->height =3D mbus->height;
--=20
2.37.3


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