linux-kernel - Re: [PATCH v5 10/10] media: i2c: imx290: set bus_type before calling v4l2_fwnode_endpoint_alloc

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Date:   Mon, 15 Jun 2020 19:31:21 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Andrey Konovalov <andrey.konovalov@...aro.org>, mchehab@...nel.org,
        sakari.ailus@....fi
CC:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        c.barrett@...mos.com, a.brela@...mos.com, peter.griffin@...aro.org
Subject: Re: [PATCH v5 10/10] media: i2c: imx290: set bus_type before calling v4l2_fwnode_endpoint_alloc_parse()



On 12 June 2020 7:23:55 PM IST, Andrey Konovalov <andrey.konovalov@...aro.org> wrote:
>The bus_type field of v4l2_fwnode_endpoint structure passed as the
>argument
>to v4l2_fwnode_endpoint_alloc_parse() function must be initiaized.
>Set it to V4L2_MBUS_CSI2_DPHY, and check for -ENXIO which is returned
>when the requested media bus type doesn't match the fwnode.
>
>Also remove v4l2_fwnode_endpoint field from struct imx290 as it is only
>needed in the probe function: use the local variable for this purpose.
>
>Signed-off-by: Andrey Konovalov <andrey.konovalov@...aro.org>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Wondering if we need to tag fixes for this patch!

Thanks, 
Mani

>---
> drivers/media/i2c/imx290.c | 38 +++++++++++++++++++-------------------
> 1 file changed, 19 insertions(+), 19 deletions(-)
>
>diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
>index 02001c1b0dfc..9c97830164e9 100644
>--- a/drivers/media/i2c/imx290.c
>+++ b/drivers/media/i2c/imx290.c
>@@ -70,7 +70,6 @@ struct imx290 {
> 	u8 bpp;
> 
> 	struct v4l2_subdev sd;
>-	struct v4l2_fwnode_endpoint ep;
> 	struct media_pad pad;
> 	struct v4l2_mbus_framefmt current_format;
> 	const struct imx290_mode *current_mode;
>@@ -914,17 +913,18 @@ static const struct media_entity_operations
>imx290_subdev_entity_ops = {
>* of MIPI data lanes are mentioned in the device tree, or the value of
>the
>  * first missing frequency otherwise.
>  */
>-static s64 imx290_check_link_freqs(const struct imx290 *imx290)
>+static s64 imx290_check_link_freqs(const struct imx290 *imx290,
>+				   const struct v4l2_fwnode_endpoint *ep)
> {
> 	int i, j;
> 	const s64 *freqs = imx290_link_freqs_ptr(imx290);
> 	int freqs_count = imx290_link_freqs_num(imx290);
> 
> 	for (i = 0; i < freqs_count; i++) {
>-		for (j = 0; j < imx290->ep.nr_of_link_frequencies; j++)
>-			if (freqs[i] == imx290->ep.link_frequencies[j])
>+		for (j = 0; j < ep->nr_of_link_frequencies; j++)
>+			if (freqs[i] == ep->link_frequencies[j])
> 				break;
>-		if (j == imx290->ep.nr_of_link_frequencies)
>+		if (j == ep->nr_of_link_frequencies)
> 			return freqs[i];
> 	}
> 	return 0;
>@@ -934,6 +934,10 @@ static int imx290_probe(struct i2c_client *client)
> {
> 	struct device *dev = &client->dev;
> 	struct fwnode_handle *endpoint;
>+	/* Only CSI2 is supported for now: */
>+	struct v4l2_fwnode_endpoint ep = {
>+		.bus_type = V4L2_MBUS_CSI2_DPHY
>+	};
> 	struct imx290 *imx290;
> 	u32 xclk_freq;
> 	s64 fq;
>@@ -956,15 +960,18 @@ static int imx290_probe(struct i2c_client
>*client)
> 		return -EINVAL;
> 	}
> 
>-	ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &imx290->ep);
>+	ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &ep);
> 	fwnode_handle_put(endpoint);
>-	if (ret) {
>+	if (ret == -ENXIO) {
>+		dev_err(dev, "Unsupported bus type, should be CSI2\n");
>+		goto free_err;
>+	} else if (ret) {
> 		dev_err(dev, "Parsing endpoint node failed\n");
> 		goto free_err;
> 	}
> 
> 	/* Get number of data lanes */
>-	imx290->nlanes = imx290->ep.bus.mipi_csi2.num_data_lanes;
>+	imx290->nlanes = ep.bus.mipi_csi2.num_data_lanes;
> 	if (imx290->nlanes != 2 && imx290->nlanes != 4) {
> 		dev_err(dev, "Invalid data lanes: %d\n", imx290->nlanes);
> 		ret = -EINVAL;
>@@ -973,27 +980,20 @@ static int imx290_probe(struct i2c_client
>*client)
> 
> 	dev_dbg(dev, "Using %u data lanes\n", imx290->nlanes);
> 
>-	if (!imx290->ep.nr_of_link_frequencies) {
>+	if (!ep.nr_of_link_frequencies) {
> 		dev_err(dev, "link-frequency property not found in DT\n");
> 		ret = -EINVAL;
> 		goto free_err;
> 	}
> 
> 	/* Check that link frequences for all the modes are in device tree */
>-	fq = imx290_check_link_freqs(imx290);
>+	fq = imx290_check_link_freqs(imx290, &ep);
> 	if (fq) {
> 		dev_err(dev, "Link frequency of %lld is not supported\n", fq);
> 		ret = -EINVAL;
> 		goto free_err;
> 	}
> 
>-	/* Only CSI2 is supported for now */
>-	if (imx290->ep.bus_type != V4L2_MBUS_CSI2_DPHY) {
>-		dev_err(dev, "Unsupported bus type, should be CSI2\n");
>-		ret = -EINVAL;
>-		goto free_err;
>-	}
>-
> 	/* get system clock (xclk) */
> 	imx290->xclk = devm_clk_get(dev, "xclk");
> 	if (IS_ERR(imx290->xclk)) {
>@@ -1108,7 +1108,7 @@ static int imx290_probe(struct i2c_client
>*client)
> 	pm_runtime_enable(dev);
> 	pm_runtime_idle(dev);
> 
>-	v4l2_fwnode_endpoint_free(&imx290->ep);
>+	v4l2_fwnode_endpoint_free(&ep);
> 
> 	return 0;
> 
>@@ -1118,7 +1118,7 @@ static int imx290_probe(struct i2c_client
>*client)
> 	v4l2_ctrl_handler_free(&imx290->ctrls);
> 	mutex_destroy(&imx290->lock);
> free_err:
>-	v4l2_fwnode_endpoint_free(&imx290->ep);
>+	v4l2_fwnode_endpoint_free(&ep);
> 
> 	return ret;
> }

-- 
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