Re: [PATCH v6 04/15] media: i2c: imx219: Report streams using frame descriptors

From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Cc: linux-media@vger.kernel.org,
	Dave Stevenson <dave.stevenson@raspberrypi.com>,
	David Plowman <david.plowman@raspberrypi.com>,
	Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>,
	Hans Verkuil <hverkuil-cisco@xs4all.nl>,
	Naushir Patuck <naush@raspberrypi.com>,
	Sakari Ailus <sakari.ailus@linux.intel.com>,
	kernel-list@raspberrypi.com,
	linux-rpi-kernel@lists.infradead.org,
	Florian Fainelli <florian.fainelli@broadcom.com>,
	Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>,
	bcm-kernel-feedback-list@broadcom.com
Subject: Re: [PATCH v6 04/15] media: i2c: imx219: Report streams using frame descriptors
Date: Mon, 4 Mar 2024 17:16:54 +0200	[thread overview]
Message-ID: <20240304151654.GC21608@pendragon.ideasonboard.com> (raw)
In-Reply-To: <tu2zcb4hwltzs3dggtzdcbj23dyofesknge6rx6hzhwdu22que@3ckcwhvkbaf7>

On Mon, Mar 04, 2024 at 10:33:37AM +0100, Jacopo Mondi wrote:
> Hi Laurent
> 
> On Fri, Mar 01, 2024 at 11:32:19PM +0200, Laurent Pinchart wrote:
> > Implement the .get_frame_desc() subdev operation to report information
> > about streams to the connected CSI-2 receiver. This is required to let
> > the CSI-2 receiver driver know about virtual channels and data types for
> > each stream.
> >
> > Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > ---
> >  drivers/media/i2c/imx219.c | 67 ++++++++++++++++++++++++++++----------
> >  1 file changed, 50 insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
> > index 52afb821f667..6e0232b6772b 100644
> > --- a/drivers/media/i2c/imx219.c
> > +++ b/drivers/media/i2c/imx219.c
> > @@ -23,6 +23,7 @@
> >  #include <linux/pm_runtime.h>
> >  #include <linux/regulator/consumer.h>
> >
> > +#include <media/mipi-csi2.h>
> >  #include <media/v4l2-cci.h>
> >  #include <media/v4l2-ctrls.h>
> >  #include <media/v4l2-device.h>
> > @@ -594,6 +595,24 @@ static void imx219_free_controls(struct imx219 *imx219)
> >   * Subdev operations
> >   */
> >
> > +static int imx219_format_bpp(u32 code)
> 
> This can be unsigned as the functions does not return errrors

I'll change that.

> Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> 
> > +{
> > +	switch (code) {
> > +	case MEDIA_BUS_FMT_SRGGB8_1X8:
> > +	case MEDIA_BUS_FMT_SGRBG8_1X8:
> > +	case MEDIA_BUS_FMT_SGBRG8_1X8:
> > +	case MEDIA_BUS_FMT_SBGGR8_1X8:
> > +		return 8;
> > +
> > +	case MEDIA_BUS_FMT_SRGGB10_1X10:
> > +	case MEDIA_BUS_FMT_SGRBG10_1X10:
> > +	case MEDIA_BUS_FMT_SGBRG10_1X10:
> > +	case MEDIA_BUS_FMT_SBGGR10_1X10:
> > +	default:
> > +		return 10;
> > +	}
> > +}
> > +
> >  static int imx219_set_framefmt(struct imx219 *imx219,
> >  			       struct v4l2_subdev_state *state)
> >  {
> > @@ -605,23 +624,7 @@ static int imx219_set_framefmt(struct imx219 *imx219,
> >
> >  	format = v4l2_subdev_state_get_format(state, IMX219_PAD_SOURCE);
> >  	crop = v4l2_subdev_state_get_crop(state, IMX219_PAD_IMAGE);
> > -
> > -	switch (format->code) {
> > -	case MEDIA_BUS_FMT_SRGGB8_1X8:
> > -	case MEDIA_BUS_FMT_SGRBG8_1X8:
> > -	case MEDIA_BUS_FMT_SGBRG8_1X8:
> > -	case MEDIA_BUS_FMT_SBGGR8_1X8:
> > -		bpp = 8;
> > -		break;
> > -
> > -	case MEDIA_BUS_FMT_SRGGB10_1X10:
> > -	case MEDIA_BUS_FMT_SGRBG10_1X10:
> > -	case MEDIA_BUS_FMT_SGBRG10_1X10:
> > -	case MEDIA_BUS_FMT_SBGGR10_1X10:
> > -	default:
> > -		bpp = 10;
> > -		break;
> > -	}
> > +	bpp = imx219_format_bpp(format->code);
> >
> >  	cci_write(imx219->regmap, IMX219_REG_X_ADD_STA_A,
> >  		  crop->left - IMX219_PIXEL_ARRAY_LEFT, &ret);
> > @@ -1031,6 +1034,35 @@ static int imx219_init_state(struct v4l2_subdev *sd,
> >  	return 0;
> >  }
> >
> > +static int imx219_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
> > +				 struct v4l2_mbus_frame_desc *fd)
> > +{
> > +	const struct v4l2_mbus_framefmt *fmt;
> > +	struct v4l2_subdev_state *state;
> > +	u32 code;
> > +
> > +	if (pad != IMX219_PAD_SOURCE)
> > +		return -EINVAL;
> > +
> > +	state = v4l2_subdev_lock_and_get_active_state(sd);
> > +	fmt = v4l2_subdev_state_get_stream_format(state, IMX219_PAD_SOURCE, 0);
> > +	code = fmt->code;
> > +	v4l2_subdev_unlock_state(state);
> > +
> > +	fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
> > +	fd->num_entries = 1;
> > +
> > +	memset(fd->entry, 0, sizeof(fd->entry));
> > +
> > +	fd->entry[0].pixelcode = code;
> > +	fd->entry[0].stream = 0;
> > +	fd->entry[0].bus.csi2.vc = 0;
> > +	fd->entry[0].bus.csi2.dt = imx219_format_bpp(code) == 8
> > +				 ? MIPI_CSI2_DT_RAW8 : MIPI_CSI2_DT_RAW10;
> > +
> > +	return 0;
> > +}
> > +
> >  static const struct v4l2_subdev_core_ops imx219_core_ops = {
> >  	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
> >  	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
> > @@ -1046,6 +1078,7 @@ static const struct v4l2_subdev_pad_ops imx219_pad_ops = {
> >  	.set_fmt = imx219_set_pad_format,
> >  	.get_selection = imx219_get_selection,
> >  	.enum_frame_size = imx219_enum_frame_size,
> > +	.get_frame_desc = imx219_get_frame_desc,
> >  };
> >
> >  static const struct v4l2_subdev_ops imx219_subdev_ops = {

-- 
Regards,

Laurent Pinchart