Re: [PATCH 2/7] media: rzv2h-ivc: Fix AXIRX_VBLANK register write

[Dan Scally <dan.scally@ideasonboard.com>]

Hi Jacopo and Barnabás

On 13/03/2026 11:13, Jacopo Mondi wrote:
> From: Barnabás Pőcze <barnabas.pocze+renesas@ideasonboard.com>
> 
> According to the documentation there are writable reserved bits in the
> register and those should not be set to 0. So use `rzv2h_ivc_update_bits()`
> with a proper bitmask.
> 
> Cc: stable@vger.kernel.org
> Fixes: f0b3984d821b ("media: platform: Add Renesas Input Video Control block driver")
> Signed-off-by: Barnabás Pőcze <barnabas.pocze+renesas@ideasonboard.com>
> Signed-off-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>
> ---

Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>

>   drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-video.c | 7 +++++--
>   drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc.h       | 2 +-
>   2 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-video.c b/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-video.c
> index 1e016b17dcee..bfe5b0c7045e 100644
> --- a/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-video.c
> +++ b/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-video.c
> @@ -7,6 +7,7 @@
>   
>   #include "rzv2h-ivc.h"
>   
> +#include <linux/bitfield.h>
>   #include <linux/cleanup.h>
>   #include <linux/iopoll.h>
>   #include <linux/lockdep.h>
> @@ -235,8 +236,10 @@ static void rzv2h_ivc_format_configure(struct rzv2h_ivc *ivc)
>   	hts = pix->width + RZV2H_IVC_FIXED_HBLANK;
>   	vblank = RZV2H_IVC_MIN_VBLANK(hts);
>   
> -	rzv2h_ivc_write(ivc, RZV2H_IVC_REG_AXIRX_BLANK,
> -			RZV2H_IVC_VBLANK(vblank));
> +	rzv2h_ivc_update_bits(ivc, RZV2H_IVC_REG_AXIRX_BLANK,
> +			      RZV2H_IVC_AXIRX_BLANK_FIELD_VBLANK,
> +			      FIELD_PREP(RZV2H_IVC_AXIRX_BLANK_FIELD_VBLANK,
> +					 vblank));
>   }
>   
>   static void rzv2h_ivc_return_buffers(struct rzv2h_ivc *ivc,
> diff --git a/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc.h b/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc.h
> index 3bcaab990b0f..4ef44c8b4656 100644
> --- a/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc.h
> +++ b/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc.h
> @@ -34,7 +34,7 @@
>   #define RZV2H_IVC_REG_AXIRX_HSIZE			0x0020
>   #define RZV2H_IVC_REG_AXIRX_VSIZE			0x0024
>   #define RZV2H_IVC_REG_AXIRX_BLANK			0x0028
> -#define RZV2H_IVC_VBLANK(x)				((x) << 16)
> +#define RZV2H_IVC_AXIRX_BLANK_FIELD_VBLANK		GENMASK(25, 16)
>   #define RZV2H_IVC_REG_AXIRX_STRD			0x0030
>   #define RZV2H_IVC_REG_AXIRX_ISSU			0x0040
>   #define RZV2H_IVC_REG_AXIRX_ERACT			0x0048
>