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Message-ID: <Yc02WlMLA+mafKDo@pendragon.ideasonboard.com>
Date: Thu, 30 Dec 2021 06:32:26 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Pratyush Yadav <p.yadav@...com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
Nikhil Devshatwar <nikhil.nd@...com>,
Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
Vignesh Raghavendra <vigneshr@...com>,
Benoit Parrot <bparrot@...com>,
Maxime Ripard <mripard@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Niklas Söderlund
<niklas.soderlund+renesas@...natech.se>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-media@...r.kernel.org
Subject: Re: [PATCH v5 03/14] media: cadence: csi2rx: Add get_fmt and set_fmt
pad ops
Hi Pratyush,
Thank you for the patch.
On Fri, Dec 24, 2021 at 12:46:04AM +0530, Pratyush Yadav wrote:
> The format is needed to calculate the link speed for the external DPHY
> configuration. It is not right to query the format from the source
> subdev. Add get_fmt and set_fmt pad operations so that the format can be
> configured and correct bpp be selected.
>
> Signed-off-by: Pratyush Yadav <p.yadav@...com>
>
> ---
>
> Changes in v5:
> - Use YUV 1X16 formats instead of 2X8.
> - New in v5.
>
> drivers/media/platform/cadence/cdns-csi2rx.c | 137 +++++++++++++++++++
> 1 file changed, 137 insertions(+)
>
> diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
> index 2547903f2e8e..4a2a5a9d019b 100644
> --- a/drivers/media/platform/cadence/cdns-csi2rx.c
> +++ b/drivers/media/platform/cadence/cdns-csi2rx.c
> @@ -54,6 +54,11 @@ enum csi2rx_pads {
> CSI2RX_PAD_MAX,
> };
>
> +struct csi2rx_fmt {
> + u32 code;
> + u8 bpp;
> +};
> +
> struct csi2rx_priv {
> struct device *dev;
> unsigned int count;
> @@ -79,12 +84,43 @@ struct csi2rx_priv {
> struct v4l2_subdev subdev;
> struct v4l2_async_notifier notifier;
> struct media_pad pads[CSI2RX_PAD_MAX];
> + struct v4l2_mbus_framefmt fmt;
>
> /* Remote source */
> struct v4l2_subdev *source_subdev;
> int source_pad;
> };
>
> +static const struct csi2rx_fmt formats[] = {
> + {
> + .code = MEDIA_BUS_FMT_YUYV8_1X16,
> + .bpp = 16,
> + },
> + {
> + .code = MEDIA_BUS_FMT_UYVY8_1X16,
> + .bpp = 16,
> + },
> + {
> + .code = MEDIA_BUS_FMT_YVYU8_1X16,
> + .bpp = 16,
> + },
> + {
> + .code = MEDIA_BUS_FMT_VYUY8_1X16,
> + .bpp = 16,
> + },
> +};
bpp isn't used. Unless you need it in a subsequent patch in the series,
you can turn the formats array into a u32 array.
> +
> +static const struct csi2rx_fmt *csi2rx_get_fmt_by_code(u32 code)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(formats); i++)
> + if (formats[i].code == code)
> + return &formats[i];
> +
> + return NULL;
> +}
> +
> static inline
> struct csi2rx_priv *v4l2_subdev_to_csi2rx(struct v4l2_subdev *subdev)
> {
> @@ -236,12 +272,109 @@ static int csi2rx_s_stream(struct v4l2_subdev *subdev, int enable)
> return ret;
> }
>
> +static struct v4l2_mbus_framefmt *
> +csi2rx_get_pad_format(struct csi2rx_priv *csi2rx,
> + struct v4l2_subdev_state *state,
> + unsigned int pad, u32 which)
> +{
> + switch (which) {
> + case V4L2_SUBDEV_FORMAT_TRY:
> + return v4l2_subdev_get_try_format(&csi2rx->subdev, state, pad);
> + case V4L2_SUBDEV_FORMAT_ACTIVE:
> + return &csi2rx->fmt;
> + default:
> + return NULL;
> + }
> +}
> +
> +static int csi2rx_get_fmt(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_format *format)
> +{
> + struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> + struct v4l2_mbus_framefmt *framefmt;
> +
> + mutex_lock(&csi2rx->lock);
> +
> + framefmt = csi2rx_get_pad_format(csi2rx, state, format->pad,
> + format->which);
> + mutex_unlock(&csi2rx->lock);
> +
> + if (!framefmt)
> + return -EINVAL;
This can't happen, you can drop the check.
> +
> + format->format = *framefmt;
This is the assignment that needs to be protected by the lock.
csi2rx_get_pad_format() returns a pointer to the storage, it doesn't
modify it.
framefmt = csi2rx_get_pad_format(csi2rx, state, format->pad,
format->which);
mutex_lock(&csi2rx->lock);
format->format = *framefmt;
mutex_unlock(&csi2rx->lock);
Same comments for csi2rx_set_fmt().
> +
> + return 0;
> +}
> +
> +static int csi2rx_set_fmt(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_format *format)
> +{
> + struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> + struct v4l2_mbus_framefmt *framefmt;
> + const struct csi2rx_fmt *fmt;
> +
> + /* No transcoding, source and sink formats must match. */
> + if (format->pad != CSI2RX_PAD_SINK)
> + return csi2rx_get_fmt(subdev, state, format);
> +
> + fmt = csi2rx_get_fmt_by_code(format->format.code);
> + if (!fmt)
> + return -EOPNOTSUPP;
This should not return an error, but instead adjust the code:
if (!csi2rx_get_fmt_by_code(format->format.code))
format->format.code = formats[0].code;
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> +
> + format->format.field = V4L2_FIELD_NONE;
> +
> + mutex_lock(&csi2rx->lock);
> + framefmt = csi2rx_get_pad_format(csi2rx, state, format->pad,
> + format->which);
> + if (!framefmt) {
> + mutex_unlock(&csi2rx->lock);
> + return -EINVAL;
> + }
> +
> + *framefmt = format->format;
> + mutex_unlock(&csi2rx->lock);
> +
> + return 0;
> +}
> +
> +static int csi2rx_init_cfg(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_state *state)
> +{
> + struct v4l2_subdev_format format = {
> + .which = state ? V4L2_SUBDEV_FORMAT_TRY
> + : V4L2_SUBDEV_FORMAT_ACTIVE,
> + .pad = CSI2RX_PAD_SINK,
> + .format = {
> + .width = 640,
> + .height = 480,
> + .code = MEDIA_BUS_FMT_UYVY8_1X16,
> + .field = V4L2_FIELD_NONE,
> + .colorspace = V4L2_COLORSPACE_SRGB,
> + .ycbcr_enc = V4L2_YCBCR_ENC_601,
> + .quantization = V4L2_QUANTIZATION_LIM_RANGE,
> + .xfer_func = V4L2_XFER_FUNC_SRGB,
> + },
> + };
> +
> + return csi2rx_set_fmt(subdev, state, &format);
> +}
> +
> +static const struct v4l2_subdev_pad_ops csi2rx_pad_ops = {
> + .get_fmt = csi2rx_get_fmt,
> + .set_fmt = csi2rx_set_fmt,
> + .init_cfg = csi2rx_init_cfg,
> +};
> +
> static const struct v4l2_subdev_video_ops csi2rx_video_ops = {
> .s_stream = csi2rx_s_stream,
> };
>
> static const struct v4l2_subdev_ops csi2rx_subdev_ops = {
> .video = &csi2rx_video_ops,
> + .pad = &csi2rx_pad_ops,
> };
>
> static int csi2rx_async_bound(struct v4l2_async_notifier *notifier,
> @@ -457,6 +590,10 @@ static int csi2rx_probe(struct platform_device *pdev)
> if (ret)
> goto err_cleanup;
>
> + ret = csi2rx_init_cfg(&csi2rx->subdev, NULL);
> + if (ret)
> + goto err_cleanup;
> +
> ret = v4l2_async_register_subdev(&csi2rx->subdev);
> if (ret < 0)
> goto err_cleanup;
--
Regards,
Laurent Pinchart
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