On Mon, May 06, 2024 at 10:10:00AM +0200, Jacopo Mondi wrote:
> On Mon, May 06, 2024 at 12:07:40AM GMT, Laurent Pinchart wrote:
> > On Fri, May 03, 2024 at 05:51:21PM +0200, Jacopo Mondi wrote:
> > > Define a list of supported mbus codes for the TXA and TXB CSI-2
> > > transmitters and implement the enum_mbus_code operation.
> >
> > The commit message should explain why, not just what. Explaining why the
>
> Should I explain why the driver has to implement enum_mbus_codes ?
You can just note it's mandatory to implement ?
> > formats for TXA and TXB differ would also be useful.
>
> ok
>
> > > Signed-off-by: Jacopo Mondi <jacopo.mondi@xxxxxxxxxxxxxxxx>
> > > ---
> > > drivers/media/i2c/adv748x/adv748x-csi2.c | 35 ++++++++++++++++++++++++
> > > 1 file changed, 35 insertions(+)
> > >
> > > diff --git a/drivers/media/i2c/adv748x/adv748x-csi2.c b/drivers/media/i2c/adv748x/adv748x-csi2.c
> > > index 9da7f6742a2b..219417b319a6 100644
> > > --- a/drivers/media/i2c/adv748x/adv748x-csi2.c
> > > +++ b/drivers/media/i2c/adv748x/adv748x-csi2.c
> > > @@ -21,6 +21,18 @@ static const struct v4l2_mbus_framefmt adv748x_csi2_default_fmt = {
> > > .field = V4L2_FIELD_NONE,
> > > };
> > >
> > > +static const unsigned int adv748x_csi2_txa_fmts[] = {
> > > + MEDIA_BUS_FMT_YUYV8_1X16,
> > > + MEDIA_BUS_FMT_YUYV10_1X20,
> >
> > CSI-2 uses UYVY, not YUYV.
>
> As this a recurring comment in the series (rightfully, I'm not
> questioning that) how does it work with existing test scripts assuming
> YUYV ? The same question could be asked about the issue Niklas had: is
> changing what pad an operation is allowed to be called on legit ?
>
> My answer would be yes, otherwise we'll be forever stuck, but I would
> like to check, especially with Niklas which maintains vin-tests.
As usual, changes of behaviour are only regressions if someone complains
about them. We can keep backward-compatibility, but it would then be
nice to also support the right media bus codes, and to add a comment
that clearly indicates which ones are for backward-compatibility.
That being said, given that userspace should use UYVY, and given that
the driver currently accepts UYVY, it should at least be enumerated. I
would skip enumeration of the media bus codes that we keep for
backward-compatibility, even if we accept them at runtime.
> > > + MEDIA_BUS_FMT_RGB565_1X16,
> > > + MEDIA_BUS_FMT_RGB666_1X18,
> > > + MEDIA_BUS_FMT_RGB888_1X24,
> > > +};
> > > +
> > > +static const unsigned int adv748x_csi2_txb_fmts[] = {
> > > + MEDIA_BUS_FMT_YUYV8_1X16,
> > > +};
> > > +
> > > int adv748x_csi2_set_virtual_channel(struct adv748x_csi2 *tx, unsigned int vc)
> > > {
> > > return tx_write(tx, ADV748X_CSI_VC_REF, vc << ADV748X_CSI_VC_REF_SHIFT);
> > > @@ -146,6 +158,28 @@ static const struct v4l2_subdev_video_ops adv748x_csi2_video_ops = {
> > > * But we must support setting the pad formats for format propagation.
> > > */
> > >
> > > +static int adv748x_csi2_enum_mbus_code(struct v4l2_subdev *sd,
> > > + struct v4l2_subdev_state *sd_state,
> > > + struct v4l2_subdev_mbus_code_enum *code)
> > > +{
> > > + struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
> > > + const unsigned int *codes = is_txa(tx) ?
> > > + adv748x_csi2_txa_fmts :
> > > + adv748x_csi2_txb_fmts;
> > > + size_t num_fmts = is_txa(tx) ? ARRAY_SIZE(adv748x_csi2_txa_fmts)
> > > + : ARRAY_SIZE(adv748x_csi2_txb_fmts);
> > > +
> > > + if (code->pad != ADV748X_CSI2_SOURCE)
> > > + return -EINVAL;
> > > +
> > > + if (code->index >= num_fmts)
> > > + return -EINVAL;
> > > +
> > > + code->code = codes[code->index];
> > > +
> > > + return 0;
> > > +}
> > > +
> > > static struct v4l2_mbus_framefmt *
> > > adv748x_csi2_get_pad_format(struct v4l2_subdev *sd,
> > > struct v4l2_subdev_state *sd_state,
> > > @@ -235,6 +269,7 @@ static int adv748x_csi2_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad
> > > }
> > >
> > > static const struct v4l2_subdev_pad_ops adv748x_csi2_pad_ops = {
> > > + .enum_mbus_code = adv748x_csi2_enum_mbus_code,
> > > .get_fmt = adv748x_csi2_get_format,
> > > .set_fmt = adv748x_csi2_set_format,
> > > .get_mbus_config = adv748x_csi2_get_mbus_config,
--
Regards,
Laurent Pinchart
