linux-kernel - Re: [PATCH v2 04/28] coresight: etm4x: Correct polling IDLE bit

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Message-ID: <aGUI977Tj9DzKYrb@e129823.arm.com>
Date: Wed, 2 Jul 2025 11:24:55 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: Leo Yan <leo.yan@....com>
Cc: Suzuki K Poulose <suzuki.poulose@....com>,
	Mike Leach <mike.leach@...aro.org>,
	James Clark <james.clark@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Yabin Cui <yabinc@...gle.com>, Keita Morisaki <keyz@...gle.com>,
	Yuanfang Zhang <quic_yuanfang@...cinc.com>,
	coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 04/28] coresight: etm4x: Correct polling IDLE bit

LGTM.
Reviewed-by: Yeoreum Yun <yeoreum.yun@....com>

> Since commit 4ff6039ffb79 ("coresight-etm4x: add isb() before reading
> the TRCSTATR"), the code has incorrectly been polling the PMSTABLE bit
> instead of the IDLE bit.
>
> This commit corrects the typo.
>
> Fixes: 4ff6039ffb79 ("coresight-etm4x: add isb() before reading the TRCSTATR")
> Signed-off-by: Leo Yan <leo.yan@....com>
> ---
>  drivers/hwtracing/coresight/coresight-etm4x-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> index ee405c88ea5faa130819f96b00b8307f8764d58a..0f2a8b8459c93ca29d270b6fa05928244e0761c5 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> @@ -1921,7 +1921,7 @@ static int __etm4_cpu_save(struct etmv4_drvdata *drvdata)
>  		state->trcpdcr = etm4x_read32(csa, TRCPDCR);
>
>  	/* wait for TRCSTATR.IDLE to go up */
> -	if (etm4x_wait_status(csa, TRCSTATR_PMSTABLE_BIT, 1)) {
> +	if (etm4x_wait_status(csa, TRCSTATR_IDLE_BIT, 1)) {
>  		dev_err(etm_dev,
>  			"timeout while waiting for Idle Trace Status\n");
>  		etm4_os_unlock(drvdata);
>
> --
> 2.34.1
>

--
Sincerely,
Yeoreum Yun