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SubjectRe: [PATCH v3 05/10] media: i2c: imx290: Add configurable link frequency and pixel rate
Hi Andrey,

On Tue, May 26, 2020 at 12:27:17PM +0300, Andrey Konovalov wrote:
> Hi Sakari,
>
> Thank you for the review!

You're welcome!

>
> On 26.05.2020 12:12, Sakari Ailus wrote:
> > Hi Andrey,
> >
> > On Sun, May 24, 2020 at 10:25:00PM +0300, Andrey Konovalov wrote:
> > > From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > >
> > > IMX290 operates with multiple link frequency and pixel rate combinations.
> > > The initial driver used a single setting for both but since we now have
> > > the lane count support in place, let's add configurable link frequency
> > > and pixel rate.
> > >
> > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > > Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org>
> > > ---
> > > drivers/media/i2c/imx290.c | 100 ++++++++++++++++++++++++-------------
> > > 1 file changed, 66 insertions(+), 34 deletions(-)
> > >
> > > diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
> > > index a361c9ac8bd5..e800557cf423 100644
> > > --- a/drivers/media/i2c/imx290.c
> > > +++ b/drivers/media/i2c/imx290.c
> > > @@ -38,8 +38,6 @@
> > > #define IMX290_HMAX_2_720 0x19C8
> > > #define IMX290_HMAX_4_720 0x0CE4
> > > -#define IMX290_DEFAULT_LINK_FREQ 445500000
> > > -
> > > static const char * const imx290_supply_name[] = {
> > > "vdda",
> > > "vddd",
> > > @@ -56,8 +54,6 @@ struct imx290_regval {
> > > struct imx290_mode {
> > > u32 width;
> > > u32 height;
> > > - u32 pixel_rate;
> > > - u32 link_freq_index;
> > > const struct imx290_regval *data;
> > > u32 data_size;
> > > @@ -248,8 +244,13 @@ static const struct imx290_regval imx290_10bit_settings[] = {
> > > };
> > > /* supported link frequencies */
> > > -static const s64 imx290_link_freq[] = {
> > > - IMX290_DEFAULT_LINK_FREQ,
> > > +static const s64 imx290_link_freq_2lanes[] = {
> > > + 891000000, /* 1920x1080 - 2 lane */
> > > + 594000000, /* 1280x720 - 2 lane */
> > > +};
> > > +static const s64 imx290_link_freq_4lanes[] = {
> > > + 445500000, /* 1920x1080 - 4 lane */
> > > + 297000000, /* 1280x720 - 4 lane */
> > > };
> > > /* Mode configs */
> > > @@ -259,16 +260,12 @@ static const struct imx290_mode imx290_modes[] = {
> > > .height = 1080,
> > > .data = imx290_1080p_settings,
> > > .data_size = ARRAY_SIZE(imx290_1080p_settings),
> > > - .pixel_rate = 178200000,
> > > - .link_freq_index = 0,
> > > },
> > > {
> > > .width = 1280,
> > > .height = 720,
> > > .data = imx290_720p_settings,
> > > .data_size = ARRAY_SIZE(imx290_720p_settings),
> > > - .pixel_rate = 178200000,
> > > - .link_freq_index = 0,
> > > },
> > > };
> > > @@ -442,6 +439,32 @@ static int imx290_get_fmt(struct v4l2_subdev *sd,
> > > return 0;
> > > }
> > > +static u8 imx290_get_link_freq_index(struct imx290 *imx290)
> > > +{
> > > + const struct imx290_mode *cur_mode = imx290->current_mode;
> > > +
> > > + return (cur_mode->width == 1920) ? 0 : 1;
> >
> > Could you use (imx290->current_mode - imx290_modes) / sizeof(*imx290_modes)
> > or something like that? It'd have fewer chances of breaking if new modes
> > are added.
> >
> > > +}
> > > +
> > > +static s64 imx290_get_link_freq(struct imx290 *imx290)
> > > +{
> > > + u8 index = imx290_get_link_freq_index(imx290);
> > > +
> > > + if (imx290->nlanes == 4)
> > > + return imx290_link_freq_4lanes[index];
> > > + else
> > > + return imx290_link_freq_2lanes[index];
> >
> > Or even better: store the link frequencies to the modes themselves. They
> > are a property of the modes after all.
>
> Then we will get two sets (for 2 lanes and for 4 lanes) of two modes (1080p and 720p), right?

Correct.

>
> > > +}
> > > +
> > > +static u64 imx290_calc_pixel_rate(struct imx290 *imx290)
> > > +{
> > > + s64 link_freq = imx290_get_link_freq(imx290);
> > > + u8 nlanes = imx290->nlanes;
> > > +
> > > + /* pixel rate = link_freq * 2 * nr_of_lanes / bits_per_sample */
> > > + return (link_freq * 2 * nlanes / 10);
> > > +}
> > > +
> > > static int imx290_set_fmt(struct v4l2_subdev *sd,
> > > struct v4l2_subdev_pad_config *cfg,
> > > struct v4l2_subdev_format *fmt)
> > > @@ -475,10 +498,14 @@ static int imx290_set_fmt(struct v4l2_subdev *sd,
> > > format = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
> > > } else {
> > > format = &imx290->current_format;
> > > - __v4l2_ctrl_s_ctrl(imx290->link_freq, mode->link_freq_index);
> > > - __v4l2_ctrl_s_ctrl_int64(imx290->pixel_rate, mode->pixel_rate);
> > > -
> > > imx290->current_mode = mode;
> > > +
> > > + if (imx290->link_freq)
> > > + __v4l2_ctrl_s_ctrl(imx290->link_freq,
> > > + imx290_get_link_freq_index(imx290));
> > > + if (imx290->pixel_rate)
> > > + __v4l2_ctrl_s_ctrl_int64(imx290->pixel_rate,
> > > + imx290_calc_pixel_rate(imx290));
> > > }
> > > *format = fmt->format;
> > > @@ -502,12 +529,11 @@ static int imx290_entity_init_cfg(struct v4l2_subdev *subdev,
> > > return 0;
> > > }
> > > -static int imx290_write_current_format(struct imx290 *imx290,
> > > - struct v4l2_mbus_framefmt *format)
> > > +static int imx290_write_current_format(struct imx290 *imx290)
> > > {
> > > int ret;
> > > - switch (format->code) {
> > > + switch (imx290->current_format.code) {
> > > case MEDIA_BUS_FMT_SRGGB10_1X10:
> > > ret = imx290_set_register_array(imx290, imx290_10bit_settings,
> > > ARRAY_SIZE(
> > > @@ -558,8 +584,8 @@ static int imx290_start_streaming(struct imx290 *imx290)
> > > return ret;
> > > }
> > > - /* Set current frame format */
> > > - ret = imx290_write_current_format(imx290, &imx290->current_format);
> > > + /* Apply the register values related to current frame format */
> > > + ret = imx290_write_current_format(imx290);
> > > if (ret < 0) {
> > > dev_err(imx290->dev, "Could not set frame format\n");
> > > return ret;
> > > @@ -821,12 +847,6 @@ static int imx290_probe(struct i2c_client *client)
> > > goto free_err;
> > > }
> > > - if (imx290->ep.link_frequencies[0] != IMX290_DEFAULT_LINK_FREQ) {
> >
> > This check needs to be modified to correspond to the driver's new
> > capabilities, not removed.
>
> Agreed.
> Do I understand correct that as the driver uses two link frequencies
> for a given number of lanes now, it must check that *the both* frequencies
> (for the given number of lanes) are listed in the device tree node?

Yes. The smiapp driver does this, for example.

--
Sakari Ailus

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