Re: [PATCH v2 2/3] i3c: master: svc: Use readsb helper for reading MDB

[Frank Li]

On Tue, Mar 18, 2025 at 01:36:05PM +0800, Stanley Chu wrote:
> From: Stanley Chu <yschu@xxxxxxxxxxx>
>
> The target can send the MDB byte followed by additional data bytes.
> The readl on MRDATAB reads one actual byte, but the readsl advances
> the destination pointer by 4 bytes. This causes the subsequent payload
> to be copied to wrong position in the destination buffer.
>
> Cc: stable@xxxxxxxxxx
> Fixes: dd3c52846d59 ("i3c: master: svc: Add Silvaco I3C master driver")
> Signed-off-by: Stanley Chu <yschu@xxxxxxxxxxx>

Reviewed-by: Frank Li <Frank.Li@xxxxxxx>

> ---
>  drivers/i3c/master/svc-i3c-master.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
> index a72ba5a7edd4..57b9dec6b5a8 100644
> --- a/drivers/i3c/master/svc-i3c-master.c
> +++ b/drivers/i3c/master/svc-i3c-master.c
> @@ -425,7 +425,7 @@ static int svc_i3c_master_handle_ibi(struct svc_i3c_master *master,
>  	       slot->len < SVC_I3C_FIFO_SIZE) {
>  		mdatactrl = readl(master->regs + SVC_I3C_MDATACTRL);
>  		count = SVC_I3C_MDATACTRL_RXCOUNT(mdatactrl);
> -		readsl(master->regs + SVC_I3C_MRDATAB, buf, count);
> +		readsb(master->regs + SVC_I3C_MRDATAB, buf, count);
>  		slot->len += count;
>  		buf += count;
>  	}
> --
> 2.34.1
>