linux-kernel - [PATCH v3 3/8] media: imx: Use dedicated format handler for i.MX7/8

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Date:   Wed,  9 Mar 2022 12:41:39 +0100
From:   Alexander Stein <alexander.stein@...tq-group.com>
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>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Dorota Czaplejewicz <dorota.czaplejewicz@...i.sm>
Cc:     linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Alexander Stein <alexander.stein@...tq-group.com>
Subject: [PATCH v3 3/8] media: imx: Use dedicated format handler for i.MX7/8

From: Dorota Czaplejewicz <dorota.czaplejewicz@...i.sm>

This splits out a format handler which takes into account
the capabilities of the i.MX7/8 video device,
as opposed to the default handler compatible with both i.MX5/6 and i.MX7/8.

Signed-off-by: Dorota Czaplejewicz <dorota.czaplejewicz@...i.sm>
Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
---
Changes in v3:
* Fixed bbp check (This driver uses bits per pixel, not bytes per pixel)

 drivers/staging/media/imx/imx-media-utils.c | 60 +++++++++++++++++++--
 1 file changed, 56 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/media/imx/imx-media-utils.c b/drivers/staging/media/imx/imx-media-utils.c
index c42f3da8e3a8..0534f7746cb3 100644
--- a/drivers/staging/media/imx/imx-media-utils.c
+++ b/drivers/staging/media/imx/imx-media-utils.c
@@ -516,10 +516,9 @@ void imx_media_try_colorimetry(struct v4l2_mbus_framefmt *tryfmt,
 }
 EXPORT_SYMBOL_GPL(imx_media_try_colorimetry);
 
-int imx_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
-				  const struct v4l2_mbus_framefmt *mbus,
-				  const struct imx_media_pixfmt *cc,
-				  enum imx_media_device_type type)
+static int imx56_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
+					   const struct v4l2_mbus_framefmt *mbus,
+					   const struct imx_media_pixfmt *cc)
 {
 	u32 width;
 	u32 stride;
@@ -568,6 +567,59 @@ int imx_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
 
 	return 0;
 }
+
+static int imx78_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
+					   const struct v4l2_mbus_framefmt *mbus,
+					   const struct imx_media_pixfmt *cc)
+{
+	u32 aligned_width;
+	int ret;
+
+	if (!cc)
+		cc = imx_media_find_mbus_format(mbus->code, PIXFMT_SEL_ANY);
+
+	if (!cc)
+		return -EINVAL;
+	/*
+	 * The hardware can handle line lengths divisible by 4 pixels
+	 * as long as the whole buffer size ends up divisible by 8 bytes.
+	 * If not, use the value of 8 pixels recommended in the datasheet.
+	 * Only 8bits-per-pixel formats may need to get aligned to 8 pixels,
+	 * because both 10-bit and 16-bit pixels occupy 2 bytes.
+	 * In those, 4-pixel aligmnent is equal to 8-byte alignment.
+	 */
+	if (cc->bpp == 8)
+		aligned_width = round_up(mbus->width, 8);
+	else
+		aligned_width = round_up(mbus->width, 4);
+
+	ret = v4l2_fill_pixfmt(pix, cc->fourcc,
+			       aligned_width, mbus->height);
+	if (ret)
+		return ret;
+
+	pix->colorspace = mbus->colorspace;
+	pix->xfer_func = mbus->xfer_func;
+	pix->ycbcr_enc = mbus->ycbcr_enc;
+	pix->quantization = mbus->quantization;
+	pix->field = mbus->field;
+
+	return ret;
+}
+
+int imx_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
+				  const struct v4l2_mbus_framefmt *mbus,
+				  const struct imx_media_pixfmt *cc,
+				  enum imx_media_device_type type)
+{
+	switch (type) {
+	case DEVICE_TYPE_IMX56:
+		return imx56_media_mbus_fmt_to_pix_fmt(pix, mbus, cc);
+	case DEVICE_TYPE_IMX78:
+		return imx78_media_mbus_fmt_to_pix_fmt(pix, mbus, cc);
+	}
+	return -EINVAL;
+}
 EXPORT_SYMBOL_GPL(imx_media_mbus_fmt_to_pix_fmt);
 
 void imx_media_free_dma_buf(struct device *dev,
-- 
2.25.1