On 28/05/21 10:23AM, Tomi Valkeinen wrote:
> On 26/05/2021 18:22, Pratyush Yadav wrote:
> > Some platforms like TI's J721E can have the CSI2RX paired with an
> > external DPHY. Add support to enable and configure the DPHY using the
> > generic PHY framework.
> >
> > Get the pixel rate and bpp from the subdev and pass them on to the DPHY
> > along with the number of lanes. All other settings are left to their
> > default values.
> >
> > Signed-off-by: Pratyush Yadav <p.yadav@xxxxxx>
> >
> > ---
> >
> > Changes in v2:
> > - Use phy_pm_runtime_get_sync() and phy_pm_runtime_put() before making
> > calls to set PHY mode, etc. to make sure it is ready.
> >
> > drivers/media/platform/cadence/cdns-csi2rx.c | 158 +++++++++++++++++--
> > 1 file changed, 148 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
> > index c68a3eac62cd..459326de2eff 100644
> > --- a/drivers/media/platform/cadence/cdns-csi2rx.c
> > +++ b/drivers/media/platform/cadence/cdns-csi2rx.c
> > @@ -30,6 +30,12 @@
> > #define CSI2RX_STATIC_CFG_DLANE_MAP(llane, plane) ((plane) << (16 + (llane) * 4))
> > #define CSI2RX_STATIC_CFG_LANES_MASK GENMASK(11, 8)
> > +#define CSI2RX_DPHY_LANE_CTRL_REG 0x40
> > +#define CSI2RX_DPHY_CL_RST BIT(16)
> > +#define CSI2RX_DPHY_DL_RST(i) BIT((i) + 12)
> > +#define CSI2RX_DPHY_CL_EN BIT(4)
> > +#define CSI2RX_DPHY_DL_EN(i) BIT(i)
> > +
> > #define CSI2RX_STREAM_BASE(n) (((n) + 1) * 0x100)
> > #define CSI2RX_STREAM_CTRL_REG(n) (CSI2RX_STREAM_BASE(n) + 0x000)
> > @@ -54,6 +60,11 @@ enum csi2rx_pads {
> > CSI2RX_PAD_MAX,
> > };
> > +struct csi2rx_fmt {
> > + u32 code;
> > + u8 bpp;
> > +};
> > +
> > struct csi2rx_priv {
> > struct device *dev;
> > unsigned int count;
> > @@ -85,6 +96,52 @@ struct csi2rx_priv {
> > int source_pad;
> > };
> > +static const struct csi2rx_fmt formats[] = {
> > + {
> > + .code = MEDIA_BUS_FMT_YUYV8_2X8,
> > + .bpp = 16,
> > + },
> > + {
> > + .code = MEDIA_BUS_FMT_UYVY8_2X8,
> > + .bpp = 16,
> > + },
> > + {
> > + .code = MEDIA_BUS_FMT_YVYU8_2X8,
> > + .bpp = 16,
> > + },
> > + {
> > + .code = MEDIA_BUS_FMT_VYUY8_2X8,
> > + .bpp = 16,
> > + },
> > +};
> > +
> > +static u8 csi2rx_get_bpp(u32 code)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < ARRAY_SIZE(formats); i++) {
> > + if (formats[i].code == code)
> > + return formats[i].bpp;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static s64 csi2rx_get_pixel_rate(struct csi2rx_priv *csi2rx)
> > +{
> > + struct v4l2_ctrl *ctrl;
> > +
> > + ctrl = v4l2_ctrl_find(csi2rx->source_subdev->ctrl_handler,
> > + V4L2_CID_PIXEL_RATE);
> > + if (!ctrl) {
> > + dev_err(csi2rx->dev, "no pixel rate control in subdev: %s\n",
> > + csi2rx->source_subdev->name);
> > + return -EINVAL;
> > + }
> > +
> > + return v4l2_ctrl_g_ctrl_int64(ctrl);
> > +}
> > +
> > static inline
> > struct csi2rx_priv *v4l2_subdev_to_csi2rx(struct v4l2_subdev *subdev)
> > {
> > @@ -101,6 +158,66 @@ static void csi2rx_reset(struct csi2rx_priv *csi2rx)
> > writel(0, csi2rx->base + CSI2RX_SOFT_RESET_REG);
> > }
> > +static int csi2rx_configure_external_dphy(struct csi2rx_priv *csi2rx)
> > +{
> > + union phy_configure_opts opts = { };
> > + struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy;
> > + struct v4l2_subdev_format sd_fmt;
> > + s64 pixel_rate;
> > + int ret;
> > + u8 bpp;
> > + bool got_pm = true;
> > +
> > + sd_fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> > + sd_fmt.pad = 0;
> > +
> > + ret = v4l2_subdev_call(csi2rx->source_subdev, pad, get_fmt, NULL,
> > + &sd_fmt);
> > + if (ret)
> > + return ret;
> > +
> > + bpp = csi2rx_get_bpp(sd_fmt.format.code);
> > + if (!bpp)
> > + return -EINVAL;
> > +
> > + pixel_rate = csi2rx_get_pixel_rate(csi2rx);
> > + if (pixel_rate < 0)
> > + return pixel_rate;
> > +
> > + ret = phy_mipi_dphy_get_default_config(pixel_rate, bpp,
> > + csi2rx->num_lanes, cfg);
> > + if (ret)
> > + return ret;
>
> I guess the above code works for now, but with multiple streams it won't.
> There's no (single) pixel rate or bpp with multiple streams, and the link
> freq is the one that needs to be used. There's v4l2_get_link_freq() helper
> which makes it easier to support both pixel rate and link freq.
Ok. I will use it instead. The less changes needed when adding
multistream support the better.
--
Regards,
Pratyush Yadav
Texas Instruments Inc.
