Re: [RFC PATCH 2/3] media: imx: imx7-media-csi: Set TWO_8BIT_SENSOR for >= 10-bit formats

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Am Sonntag, dem 16.05.2021 um 05:42 +0300 schrieb Laurent Pinchart:
> Sample code from NXP, as well as experiments on i.MX8MM with RAW10
> capture with an OV5640 sensor connected over CSI-2, showed that the
> TWO_8BIT_SENSOR field of the CSICR3 register needs to be set for
> formats
> larger than 8 bits. Do so, even if the reference manual doesn't
> clearly
> describe the effect of the field.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
>  drivers/staging/media/imx/imx7-media-csi.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/imx/imx7-media-csi.c
> b/drivers/staging/media/imx/imx7-media-csi.c
> index f85a2f5f1413..256b9aa978f0 100644
> --- a/drivers/staging/media/imx/imx7-media-csi.c
> +++ b/drivers/staging/media/imx/imx7-media-csi.c
> @@ -422,6 +422,7 @@ static void imx7_csi_configure(struct imx7_csi
> *csi)
>         int width = out_pix->width;
>         u32 stride = 0;
>         u32 cr1, cr18;
> +       u32 cr3 = 0;
>  
>         cr18 = imx7_csi_reg_read(csi, CSI_CSICR18);
>  
> @@ -464,6 +465,7 @@ static void imx7_csi_configure(struct imx7_csi
> *csi)
>                 case MEDIA_BUS_FMT_SGBRG10_1X10:
>                 case MEDIA_BUS_FMT_SGRBG10_1X10:
>                 case MEDIA_BUS_FMT_SRGGB10_1X10:
> +                       cr3 |= BIT_TWO_8BIT_SENSOR;
>                         cr18 |= BIT_MIPI_DATA_FORMAT_RAW10;
>                         break;
>                 case MEDIA_BUS_FMT_Y12_1X12:
> @@ -471,6 +473,7 @@ static void imx7_csi_configure(struct imx7_csi
> *csi)
>                 case MEDIA_BUS_FMT_SGBRG12_1X12:
>                 case MEDIA_BUS_FMT_SGRBG12_1X12:
>                 case MEDIA_BUS_FMT_SRGGB12_1X12:
> +                       cr3 |= BIT_TWO_8BIT_SENSOR;
>                         cr18 |= BIT_MIPI_DATA_FORMAT_RAW12;
>                         break;
>                 case MEDIA_BUS_FMT_Y14_1X14:
> @@ -478,6 +481,7 @@ static void imx7_csi_configure(struct imx7_csi
> *csi)
>                 case MEDIA_BUS_FMT_SGBRG14_1X14:
>                 case MEDIA_BUS_FMT_SGRBG14_1X14:
>                 case MEDIA_BUS_FMT_SRGGB14_1X14:
> +                       cr3 |= BIT_TWO_8BIT_SENSOR;
>                         cr18 |= BIT_MIPI_DATA_FORMAT_RAW14;
>                         break;
>                 /*
> @@ -510,7 +514,7 @@ static void imx7_csi_configure(struct imx7_csi
> *csi)
>  
>         imx7_csi_reg_write(csi, cr1, CSI_CSICR1);
>         imx7_csi_reg_write(csi, BIT_DMA_BURST_TYPE_RFF_INCR16,
> CSI_CSICR2);
> -       imx7_csi_reg_write(csi, BIT_FRMCNT_RST, CSI_CSICR3);
> +       imx7_csi_reg_write(csi, BIT_FRMCNT_RST | cr3, CSI_CSICR3);
>         imx7_csi_reg_write(csi, cr18, CSI_CSICR18);
>  
>         imx7_csi_reg_write(csi, (width * out_pix->height) >> 2,
> CSI_CSIRXCNT);

I can confirm that BIT_TWO_8BIT_SENSOR is needed for raw10 bayer
formats for me here.

Tested-by: Martin Kepplinger <martin.kepplinger@xxxxxxx>

thanks,
                          martin





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