Re: [PATCH 1/5] rtc: renesas-rtca3: Fix PIE clear polling condition in alarm setup error path

[Claudiu Beznea <claudiu.beznea@tuxon.dev>]

Hi, Prabhakar,

On 5/6/26 19:49, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> 
> In rtca3_set_alarm(), the setup_failed path attempts to disable the
> Periodic Interrupt Enable (PIE) bit and wait until it is cleared.
> However, the polling condition passed to readb_poll_timeout_atomic()
> uses an incorrect expression:
> 
>      !(tmp & ~RTCA3_RCR1_PIE)
> 
> As ~RTCA3_RCR1_PIE evaluates to a mask of all bits except PIE, the
> condition effectively waits for all non-PIE bits to become zero, which
> is unrelated to the intended operation and is unlikely to ever be true.
> This causes the poll to time out unnecessarily.
> 
> Fix the condition to check for the PIE bit itself being cleared:
> 
>      !(tmp & RTCA3_RCR1_PIE)
> 
> This correctly waits until PIE is deasserted after being cleared.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Tested-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> # on RZ/G3S

I think it also deserves a Fixes tag?

Thank you,
Claudiu