[PATCH 4/6] i2c: spacemit: check SDA instead of SCL after bus reset

[Aurelien Jarno]

On 2025-08-27 15:39, Troy Mitchell wrote:
> After calling spacemit_i2c_conditionally_reset_bus(),
> the controller should ensure that the SDA line is release
> before proceeding.
> 
> Previously, the driver checked the SCL line instead,
> which does not guarantee that the bus is truly idle.
> 
> This patch changes the check to verify SDA. This ensures
> proper bus recovery and avoids potential communication errors
> after a conditional reset.
> 
> Fixes: 5ea558473fa31 ("i2c: spacemit: add support for SpacemiT K1 SoC")
> Signed-off-by: Troy Mitchell <troy.mitchell at linux.spacemit.com>
> ---
>  drivers/i2c/busses/i2c-k1.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-k1.c b/drivers/i2c/busses/i2c-k1.c
> index c1656b78f1681729ccc2ebca6e290259d14889d9..4d78ee7b6929ee43771e500d4f85d9e55e68b221 100644
> --- a/drivers/i2c/busses/i2c-k1.c
> +++ b/drivers/i2c/busses/i2c-k1.c
> @@ -172,9 +172,9 @@ static void spacemit_i2c_conditionally_reset_bus(struct spacemit_i2c_dev *i2c)
>  	spacemit_i2c_reset(i2c);
>  	usleep_range(10, 20);
>  
> -	/* check scl status again */
> +	/* check sda again here */
>  	status = readl(i2c->base + SPACEMIT_IBMR);
> -	if (!(status & SPACEMIT_BMR_SCL))
> +	if (!(status & SPACEMIT_BMR_SDA))
>  		dev_warn_ratelimited(i2c->dev, "unit reset failed\n");
>  }

Reviewed-by: Aurelien Jarno <aurelien at aurel32.net>

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien at aurel32.net                     http://aurel32.net