On 11/11/17 01:38, 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 this function is 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+rene...@ragnatech.se>
Reviewed-by: Hans Verkuil <hans.verk...@cisco.com>
Regards,
Hans
> ---
> drivers/media/platform/rcar-vin/rcar-dma.c | 25 +++++++++++++++++++++++++
> drivers/media/platform/rcar-vin/rcar-vin.h | 2 ++
> 2 files changed, 27 insertions(+)
>
> diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c
> b/drivers/media/platform/rcar-vin/rcar-dma.c
> index c4f8e81e88c99e28..463c656b9878be52 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 +1229,27 @@ 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, vnmc;
> +
> + pm_runtime_get_sync(vin->dev);
> +
> + /* Make register writes take effect immediately */
> + vnmc = rvin_read(vin, VNMC_REG) & ~VNMC_VUP;
> + rvin_write(vin, vnmc, 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);
> +}
> diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h
> b/drivers/media/platform/rcar-vin/rcar-vin.h
> index 1f761518a6cc60b8..8a7c51724a90786c 100644
> --- a/drivers/media/platform/rcar-vin/rcar-vin.h
> +++ b/drivers/media/platform/rcar-vin/rcar-vin.h
> @@ -164,4 +164,6 @@ 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);
> +
> #endif
>
