linux-kernel - [PATCH] media: imx: Fix rounding

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Date:   Fri, 24 Sep 2021 12:06:31 +0200
From:   Dorota Czaplejewicz <dorota.czaplejewicz@...i.sm>
To:     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
Cc:     kernel@...i.sm, phone-devel@...r.kernel.org
Subject: [PATCH] media: imx: Fix rounding

Change rounding to the minimal burst size from 2^n to n.

This fixes images with sizes that are a multiple of 8 pixels.

See section 13.7.6.13 CSI Image Parameter Register of the
i.MX 8M Quad Applications Processors Reference Manual.

Fixes: 451a7b7815d0b ("media: imx: lift CSI and PRP ENC/VF width
alignment restriction")
Signed-off-by: Dorota Czaplejewicz <dorota.czaplejewicz@...i.sm>
---
Hi,

I tested this patch on the Librem 5 with the main camera.

--Dorota
 drivers/staging/media/imx/imx-media-utils.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/media/imx/imx-media-utils.c b/drivers/staging/media/imx/imx-media-utils.c
index 5128915a5d6f..a2d8fab32a39 100644
--- a/drivers/staging/media/imx/imx-media-utils.c
+++ b/drivers/staging/media/imx/imx-media-utils.c
@@ -545,13 +545,13 @@ int imx_media_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, 3);
 
 	/* Round up stride for IDMAC line start address alignment */
 	if (cc->planar)
-		stride = round_up(width, 16);
+		stride = round_up(width, 4);
 	else
-		stride = round_up((width * cc->bpp) >> 3, 8);
+		stride = round_up((width * cc->bpp) >> 3, 3);
 
 	pix->width = width;
 	pix->height = mbus->height;
-- 
2.31.1


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