On 23/08/17 01:26, Niklas Söderlund wrote:
> On Gen3 the CSI-2 routing is controlled by the VnCSI_IFMD register. One
> feature of this register is that it's only present in the VIN0 and VIN4
> instances. The register in VIN0 controls the routing for VIN0-3 and the
> register in VIN4 controls routing for VIN4-7.
>
> To be able to control routing from a media device these functions need
> to control runtime PM for the subgroup master (VIN0 and VIN4). The
> subgroup master must be switched on before the register is manipulated,
> once the operation is complete it's safe to switch the master off and
> the new routing will still be in effect.
>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
Reviewed-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Regards,
Hans
> ---
> drivers/media/platform/rcar-vin/rcar-dma.c | 41 ++++++++++++++++++++++++++++++
> drivers/media/platform/rcar-vin/rcar-vin.h | 3 +++
> 2 files changed, 44 insertions(+)
>
> diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
> index c4f8e81e88c99e28..6206fab7b6cdc55a 100644
> --- a/drivers/media/platform/rcar-vin/rcar-dma.c
> +++ b/drivers/media/platform/rcar-vin/rcar-dma.c
> @@ -16,6 +16,7 @@
>
> #include <linux/delay.h>
> #include <linux/interrupt.h>
> +#include <linux/pm_runtime.h>
>
> #include <media/videobuf2-dma-contig.h>
>
> @@ -1228,3 +1229,43 @@ int rvin_dma_probe(struct rvin_dev *vin, int irq)
>
> return ret;
> }
> +
> +/* -----------------------------------------------------------------------------
> + * Gen3 CHSEL manipulation
> + */
> +
> +void rvin_set_chsel(struct rvin_dev *vin, u8 chsel)
> +{
> + u32 ifmd;
> +
> + pm_runtime_get_sync(vin->dev);
> +
> + /*
> + * Undocumented feature: Writing to VNCSI_IFMD_REG will go
> + * through and on read back look correct but won't have
> + * any effect if VNMC_REG is not first set to 0.
> + */
> + rvin_write(vin, 0, VNMC_REG);
> +
> + ifmd = VNCSI_IFMD_DES2 | VNCSI_IFMD_DES1 | VNCSI_IFMD_DES0 |
> + VNCSI_IFMD_CSI_CHSEL(chsel);
> +
> + rvin_write(vin, ifmd, VNCSI_IFMD_REG);
> +
> + vin_dbg(vin, "Set IFMD 0x%x\n", ifmd);
> +
> + pm_runtime_put(vin->dev);
> +}
> +
> +int rvin_get_chsel(struct rvin_dev *vin)
> +{
> + int chsel;
> +
> + pm_runtime_get_sync(vin->dev);
> +
> + chsel = rvin_read(vin, VNCSI_IFMD_REG) & VNCSI_IFMD_CSI_CHSEL_MASK;
> +
> + pm_runtime_put(vin->dev);
> +
> + return chsel;
> +}
> diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h b/drivers/media/platform/rcar-vin/rcar-vin.h
> index c4608686666d2d81..94c606f2b8f2f246 100644
> --- a/drivers/media/platform/rcar-vin/rcar-vin.h
> +++ b/drivers/media/platform/rcar-vin/rcar-vin.h
> @@ -164,4 +164,7 @@ int rvin_reset_format(struct rvin_dev *vin);
>
> const struct rvin_video_format *rvin_format_from_pixel(u32 pixelformat);
>
> +void rvin_set_chsel(struct rvin_dev *vin, u8 chsel);
> +int rvin_get_chsel(struct rvin_dev *vin);
> +
> #endif
>
