Re: [PATCH v12 20/33] rcar-vin: add function to manipulate Gen3 chsel value

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On 07/03/18 23:04, 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+renesas@xxxxxxxxxxxx>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>

Reviewed-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>

Regards,

	Hans

> ---
>  drivers/media/platform/rcar-vin/rcar-dma.c | 38 ++++++++++++++++++++++++++++++
>  drivers/media/platform/rcar-vin/rcar-vin.h |  2 ++
>  2 files changed, 40 insertions(+)
> 
> diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
> index 483d31f07b934929..75382ee0f3fc1dde 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>
>  
> @@ -1224,3 +1225,40 @@ int rvin_dma_register(struct rvin_dev *vin, int irq)
>  
>  	return ret;
>  }
> +
> +/* -----------------------------------------------------------------------------
> + * Gen3 CHSEL manipulation
> + */
> +
> +/*
> + * There is no need to have locking around changing the routing
> + * as it's only possible to do so when no VIN in the group is
> + * streaming so nothing can race with the VNMC register.
> + */
> +int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel)
> +{
> +	u32 ifmd, vnmc;
> +	int ret;
> +
> +	ret = pm_runtime_get_sync(vin->dev);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* Make register writes take effect immediately. */
> +	vnmc = rvin_read(vin, VNMC_REG);
> +	rvin_write(vin, vnmc & ~VNMC_VUP, 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);
> +
> +	/* Restore VNMC. */
> +	rvin_write(vin, vnmc, VNMC_REG);
> +
> +	pm_runtime_put(vin->dev);
> +
> +	return ret;
> +}
> diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h b/drivers/media/platform/rcar-vin/rcar-vin.h
> index 5e3ea8d401d934d1..8e20455927fe5224 100644
> --- a/drivers/media/platform/rcar-vin/rcar-vin.h
> +++ b/drivers/media/platform/rcar-vin/rcar-vin.h
> @@ -169,4 +169,6 @@ const struct rvin_video_format *rvin_format_from_pixel(u32 pixelformat);
>  /* Cropping, composing and scaling */
>  void rvin_crop_scale_comp(struct rvin_dev *vin);
>  
> +int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel);
> +
>  #endif
> 




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