linux-kernel - Re: [PATCH] Coresight: Set correct cs_mode for TPDM to fix disable issue

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Date: Wed, 26 Jun 2024 09:24:43 +0800
From: JieGan <quic_jiegan@...cinc.com>
To: Suzuki K Poulose <suzuki.poulose@....com>
CC: Mathieu Poirier <mathieu.poirier@...aro.org>,
        Alexander Shishkin
	<alexander.shishkin@...ux.intel.com>,
        Konrad Dybcio <konradybcio@...il.com>,
        Mike Leach <mike.leach@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jinlong Mao
	<quic_jinlmao@...cinc.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <coresight@...ts.linaro.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Tingwei Zhang
	<quic_tingweiz@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        "Tao
 Zhang" <quic_taozha@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        "Song
 Chai" <quic_songchai@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <andersson@...nel.org>,
        <quic_yijiyang@...cinc.com>, <quic_yuanjiey@...cinc.com>,
        <quic_liuxin@...cinc.com>, <quic_yanzl@...cinc.com>,
        <quic_xinlon@...cinc.com>, <quic_xueqnie@...cinc.com>,
        <quic_sijiwu@...cinc.com>
Subject: Re: [PATCH] Coresight: Set correct cs_mode for TPDM to fix disable
 issue

On Tue, Jun 25, 2024 at 01:24:11PM +0100, Suzuki K Poulose wrote:
> On 25/06/2024 03:12, Jie Gan wrote:
> > The coresight_disable_source_sysfs function should verify the
> > mode of the coresight device before disabling the source.
> > However, the mode for the TPDM device is always set to
> > CS_MODE_DISABLED, resulting in the check consistently failing.
> > As a result, TPDM cannot be properly disabled.
> > 
> > To fix the issue:
> > Configure CS_MODE_SYSFS/CS_MODE_PERF during the enablement of TPDM.
> > Configure CS_MODE_DISABLED during the disablement of TPDM.
> > 
> > Fixes: 1f5149c7751c("coresight: Move all sysfs code to sysfs file")
> 
> That looks like the wrong commit. This was a problem since the original
> TPDM driver. I would say :
> 
> Fixes: b3c71626a933 ("Coresight: Add coresight TPDM source driver")
I will correct the Fixes tag and re-send the patch.

> 
> > Signed-off-by: Jie Gan <quic_jiegan@...cinc.com>
> 
> Otherwise, the patch looks good to me.
> 
> Please could you also fixup "dummy" source driver in a separate patch.
Sure.

> 
> Suzuki
> 

Thanks,
Jie