linux-kernel - [PATCH v2 RESEND] Coresight: Set correct cs

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Message-ID: <20240812043043.2890694-1-quic_jiegan@quicinc.com>
Date: Mon, 12 Aug 2024 12:30:43 +0800
From: Jie Gan <quic_jiegan@...cinc.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Alexander Shishkin
	<alexander.shishkin@...ux.intel.com>,
        Mike Leach <mike.leach@...aro.org>
CC: Jinlong Mao <quic_jinlmao@...cinc.com>, <coresight@...ts.linaro.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Yuanfang Zhang
	<quic_yuanfang@...cinc.com>,
        Tao Zhang <quic_taozha@...cinc.com>,
        Song Chai
	<quic_songchai@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>
Subject: [PATCH v2 RESEND] Coresight: Set correct cs_mode for TPDM to fix disable issue

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.

Configure CS_MODE_SYSFS/CS_MODE_PERF during the enablement.
Configure CS_MODE_DISABLED during the disablement.

Fixes: b3c71626a933 ("Coresight: Add coresight TPDM source driver")
Signed-off-by: Jie Gan <quic_jiegan@...cinc.com>
---
 drivers/hwtracing/coresight/coresight-tpdm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
index a9708ab0d488..90a5105f6199 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -449,6 +449,11 @@ static int tpdm_enable(struct coresight_device *csdev, struct perf_event *event,
 		return -EBUSY;
 	}
 
+	if (!coresight_take_mode(csdev, mode)) {
+		spin_unlock(&drvdata->spinlock);
+		return -EBUSY;
+	}
+
 	__tpdm_enable(drvdata);
 	drvdata->enable = true;
 	spin_unlock(&drvdata->spinlock);
@@ -506,6 +511,7 @@ static void tpdm_disable(struct coresight_device *csdev,
 	}
 
 	__tpdm_disable(drvdata);
+	coresight_set_mode(csdev, CS_MODE_DISABLED);
 	drvdata->enable = false;
 	spin_unlock(&drvdata->spinlock);
 
-- 
2.34.1