On Sat, Jul 29, 2017 at 12:00:39AM -0700, Chiranjeevi Rapolu wrote:
> Previously both link-frequency and pixel-rate reported by
> the sensor was incorrect, resulting in incorrect FPS.
> Report link-frequency in Hz rather than link data rate in bps.
> Calculate pixel-rate from link-frequency.
>
> Signed-off-by: Chiranjeevi Rapolu <chiranjeevi.rap...@intel.com>
> ---
> Changes in v2:
> - Fix typo, from PLL to PPL.
> - Suffixed ULL instead of typecasting to uint64_t
> drivers/media/i2c/ov13858.c | 28 +++++++++++++++-------------
> 1 file changed, 15 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/media/i2c/ov13858.c b/drivers/media/i2c/ov13858.c
> index 86550d8..9b87820 100644
> --- a/drivers/media/i2c/ov13858.c
> +++ b/drivers/media/i2c/ov13858.c
> @@ -60,8 +60,8 @@
> #define OV13858_VBLANK_MIN 56
>
> /* HBLANK control - read only */
> -#define OV13858_PPL_540MHZ 2244
> -#define OV13858_PPL_1080MHZ 4488
> +#define OV13858_PPL_270MHZ 2244
> +#define OV13858_PPL_540MHZ 4488
>
> /* Exposure control */
> #define OV13858_REG_EXPOSURE 0x3500
> @@ -944,31 +944,33 @@ struct ov13858_mode {
>
> /* Configurations for supported link frequencies */
> #define OV13858_NUM_OF_LINK_FREQS 2
> -#define OV13858_LINK_FREQ_1080MBPS 1080000000
> -#define OV13858_LINK_FREQ_540MBPS 540000000
> +#define OV13858_LINK_FREQ_540MHZ 540000000ULL
> +#define OV13858_LINK_FREQ_270MHZ 270000000ULL
> #define OV13858_LINK_FREQ_INDEX_0 0
> #define OV13858_LINK_FREQ_INDEX_1 1
>
> /* Menu items for LINK_FREQ V4L2 control */
> static const s64 link_freq_menu_items[OV13858_NUM_OF_LINK_FREQS] = {
> - OV13858_LINK_FREQ_1080MBPS,
> - OV13858_LINK_FREQ_540MBPS
> + OV13858_LINK_FREQ_540MHZ,
> + OV13858_LINK_FREQ_270MHZ
> };
>
> /* Link frequency configs */
> static const struct ov13858_link_freq_config
> link_freq_configs[OV13858_NUM_OF_LINK_FREQS] = {
> {
> - .pixel_rate = 864000000,
> - .pixels_per_line = OV13858_PPL_1080MHZ,
> + /* pixel_rate = link_freq * 2 * nr_of_lanes / bits_per_sample */
> + .pixel_rate = (OV13858_LINK_FREQ_540MHZ * 2 * 4) / 10,
You could calculate the pixel rate at runtime instead. The change should be
done to all mode definitions, not just the two here.
> + .pixels_per_line = OV13858_PPL_540MHZ,
> .reg_list = {
> .num_of_regs = ARRAY_SIZE(mipi_data_rate_1080mbps),
> .regs = mipi_data_rate_1080mbps,
> }
> },
> {
> - .pixel_rate = 432000000,
> - .pixels_per_line = OV13858_PPL_540MHZ,
> + /* pixel_rate = link_freq * 2 * nr_of_lanes / bits_per_sample */
> + .pixel_rate = (OV13858_LINK_FREQ_270MHZ * 2 * 4) / 10,
> + .pixels_per_line = OV13858_PPL_270MHZ,
> .reg_list = {
> .num_of_regs = ARRAY_SIZE(mipi_data_rate_540mbps),
> .regs = mipi_data_rate_540mbps,
> @@ -1634,10 +1636,10 @@ static int ov13858_init_controls(struct ov13858
> *ov13858)
>
> ov13858->hblank = v4l2_ctrl_new_std(
> ctrl_hdlr, &ov13858_ctrl_ops, V4L2_CID_HBLANK,
> - OV13858_PPL_1080MHZ - ov13858->cur_mode->width,
> - OV13858_PPL_1080MHZ - ov13858->cur_mode->width,
> + OV13858_PPL_540MHZ - ov13858->cur_mode->width,
> + OV13858_PPL_540MHZ - ov13858->cur_mode->width,
> 1,
> - OV13858_PPL_1080MHZ - ov13858->cur_mode->width);
> + OV13858_PPL_540MHZ - ov13858->cur_mode->width);
You could make use of cur_mode->link_freq_index here.
I'm applying this now, please address these in a follow-up patch.
> ov13858->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
>
> ov13858->exposure = v4l2_ctrl_new_std(
> --
> 1.9.1
>
--
Sakari Ailus
e-mail: sakari.ai...@iki.fi XMPP: sai...@retiisi.org.uk
