On Sun, Feb 20, 2022 at 5:53 AM Laurent Pinchart
<laurent.pinchart@xxxxxxxxxxxxxxxx> wrote:
>
> Hi Jacopo,
>
> Thank you for the patch.
>
> On Thu, Feb 10, 2022 at 12:04:36PM +0100, Jacopo Mondi wrote:
> > Add to each mode supported by the sensor the ideal pixel rate, as
> > defined by Table 2.1 in the chip manual.
> >
> > The ideal pixel rate will be used to compute the MIPI CSI-2 clock tree.
> >
I tried this on my imx8mm at a variety of resolutions. I don't have a
functional display yet, so I couldn't test streaming to a screen, but
I did capture images and encode them into an AVI. From what I can
tell, the exposure seems to handle darker environments better now.
Maybe it's just a placebo effect. If there are certain resolutions or
formats you want me to test, let me know.
Tested-by: Adam Ford <aford173@xxxxxxxxx> #imx8mm-beacon-kit
> > Signed-off-by: Jacopo Mondi <jacopo@xxxxxxxxxx>
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
>
> > ---
> > drivers/media/i2c/ov5640.c | 44 +++++++++++++++++++++++++++++++++++---
> > 1 file changed, 41 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
> > index db5a19babe67..01f4a075f86e 100644
> > --- a/drivers/media/i2c/ov5640.c
> > +++ b/drivers/media/i2c/ov5640.c
> > @@ -118,6 +118,29 @@ enum ov5640_frame_rate {
> > OV5640_NUM_FRAMERATES,
> > };
> >
> > +enum ov5640_pixel_rate_id {
> > + OV5640_PIXEL_RATE_168M,
> > + OV5640_PIXEL_RATE_148M,
> > + OV5640_PIXEL_RATE_124M,
> > + OV5640_PIXEL_RATE_96M,
> > + OV5640_PIXEL_RATE_48M,
> > + OV5640_NUM_PIXEL_RATES,
> > +};
> > +
> > +/*
> > + * The chip manual suggests 24/48/96/192 MHz pixel clocks.
> > + *
> > + * 192MHz exceeds the sysclk limits; use 168MHz as maximum pixel rate for
> > + * full resolution mode @15 FPS.
> > + */
> > +static const u32 ov5640_pixel_rates[] = {
> > + [OV5640_PIXEL_RATE_168M] = 168000000,
> > + [OV5640_PIXEL_RATE_148M] = 148000000,
> > + [OV5640_PIXEL_RATE_124M] = 124000000,
> > + [OV5640_PIXEL_RATE_96M] = 96000000,
> > + [OV5640_PIXEL_RATE_48M] = 48000000,
> > +};
> > +
> > enum ov5640_format_mux {
> > OV5640_FMT_MUX_YUV422 = 0,
> > OV5640_FMT_MUX_RGB,
> > @@ -189,6 +212,7 @@ struct reg_value {
> > struct ov5640_mode_info {
> > enum ov5640_mode_id id;
> > enum ov5640_downsize_mode dn_mode;
> > + enum ov5640_pixel_rate_id pixel_rate;
> > u32 hact;
> > u32 htot;
> > u32 vact;
> > @@ -565,7 +589,9 @@ static const struct reg_value ov5640_setting_QSXGA_2592_1944[] = {
> >
> > /* power-on sensor init reg table */
> > static const struct ov5640_mode_info ov5640_mode_init_data = {
> > - 0, SUBSAMPLING, 640, 1896, 480, 984,
> > + 0, SUBSAMPLING,
> > + OV5640_PIXEL_RATE_96M,
> > + 640, 1896, 480, 984,
> > ov5640_init_setting_30fps_VGA,
> > ARRAY_SIZE(ov5640_init_setting_30fps_VGA),
> > OV5640_30_FPS,
> > @@ -574,51 +600,61 @@ static const struct ov5640_mode_info ov5640_mode_init_data = {
> > static const struct ov5640_mode_info
> > ov5640_mode_data[OV5640_NUM_MODES] = {
> > {OV5640_MODE_QQVGA_160_120, SUBSAMPLING,
> > + OV5640_PIXEL_RATE_48M,
> > 160, 1896, 120, 984,
> > ov5640_setting_QQVGA_160_120,
> > ARRAY_SIZE(ov5640_setting_QQVGA_160_120),
> > OV5640_30_FPS},
> > {OV5640_MODE_QCIF_176_144, SUBSAMPLING,
> > + OV5640_PIXEL_RATE_48M,
> > 176, 1896, 144, 984,
> > ov5640_setting_QCIF_176_144,
> > ARRAY_SIZE(ov5640_setting_QCIF_176_144),
> > OV5640_30_FPS},
> > {OV5640_MODE_QVGA_320_240, SUBSAMPLING,
> > + OV5640_PIXEL_RATE_48M,
> > 320, 1896, 240, 984,
> > ov5640_setting_QVGA_320_240,
> > ARRAY_SIZE(ov5640_setting_QVGA_320_240),
> > OV5640_30_FPS},
> > {OV5640_MODE_VGA_640_480, SUBSAMPLING,
> > + OV5640_PIXEL_RATE_48M,
> > 640, 1896, 480, 1080,
> > ov5640_setting_VGA_640_480,
> > ARRAY_SIZE(ov5640_setting_VGA_640_480),
> > OV5640_60_FPS},
> > {OV5640_MODE_NTSC_720_480, SUBSAMPLING,
> > + OV5640_PIXEL_RATE_96M,
> > 720, 1896, 480, 984,
> > ov5640_setting_NTSC_720_480,
> > ARRAY_SIZE(ov5640_setting_NTSC_720_480),
> > OV5640_30_FPS},
> > {OV5640_MODE_PAL_720_576, SUBSAMPLING,
> > + OV5640_PIXEL_RATE_96M,
> > 720, 1896, 576, 984,
> > ov5640_setting_PAL_720_576,
> > ARRAY_SIZE(ov5640_setting_PAL_720_576),
> > OV5640_30_FPS},
> > {OV5640_MODE_XGA_1024_768, SUBSAMPLING,
> > + OV5640_PIXEL_RATE_96M,
> > 1024, 1896, 768, 1080,
> > ov5640_setting_XGA_1024_768,
> > ARRAY_SIZE(ov5640_setting_XGA_1024_768),
> > OV5640_30_FPS},
> > {OV5640_MODE_720P_1280_720, SUBSAMPLING,
> > + OV5640_PIXEL_RATE_124M,
> > 1280, 1892, 720, 740,
> > ov5640_setting_720P_1280_720,
> > ARRAY_SIZE(ov5640_setting_720P_1280_720),
> > OV5640_30_FPS},
> > {OV5640_MODE_1080P_1920_1080, SCALING,
> > + OV5640_PIXEL_RATE_148M,
> > 1920, 2500, 1080, 1120,
> > ov5640_setting_1080P_1920_1080,
> > ARRAY_SIZE(ov5640_setting_1080P_1920_1080),
> > OV5640_30_FPS},
> > {OV5640_MODE_QSXGA_2592_1944, SCALING,
> > + OV5640_PIXEL_RATE_168M,
> > 2592, 2844, 1944, 1968,
> > ov5640_setting_QSXGA_2592_1944,
> > ARRAY_SIZE(ov5640_setting_QSXGA_2592_1944),
> > @@ -2743,6 +2779,7 @@ static const struct v4l2_ctrl_ops ov5640_ctrl_ops = {
> >
> > static int ov5640_init_controls(struct ov5640_dev *sensor)
> > {
> > + const struct ov5640_mode_info *mode = sensor->current_mode;
> > const struct v4l2_ctrl_ops *ops = &ov5640_ctrl_ops;
> > struct ov5640_ctrls *ctrls = &sensor->ctrls;
> > struct v4l2_ctrl_handler *hdl = &ctrls->handler;
> > @@ -2755,8 +2792,9 @@ static int ov5640_init_controls(struct ov5640_dev *sensor)
> >
> > /* Clock related controls */
> > ctrls->pixel_rate = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_PIXEL_RATE,
> > - 0, INT_MAX, 1,
> > - ov5640_calc_pixel_rate(sensor));
> > + ov5640_pixel_rates[OV5640_NUM_PIXEL_RATES - 1],
> > + ov5640_pixel_rates[0], 1,
> > + ov5640_pixel_rates[mode->pixel_rate]);
> >
> > /* Auto/manual white balance */
> > ctrls->auto_wb = v4l2_ctrl_new_std(hdl, ops,
>
> --
> Regards,
>
> Laurent Pinchart
