linux-kernel - [PATCH v1 2/3] coresight: tpda: add function to configure TPDA

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Message-Id: <20250826070150.5603-3-jie.gan@oss.qualcomm.com>
Date: Tue, 26 Aug 2025 15:01:49 +0800
From: Jie Gan <jie.gan@....qualcomm.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Tingwei Zhang <tingwei.zhang@....qualcomm.com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH v1 2/3] coresight: tpda: add function to configure TPDA_SYNCR register

From: Tao Zhang <tao.zhang@....qualcomm.com>

The TPDA_SYNCR register defines the frequency at which TPDA generates
ASYNC packets, enabling userspace tools to accurately parse each valid
packet.

Signed-off-by: Tao Zhang <tao.zhang@....qualcomm.com>
Co-developed-by: Jie Gan <jie.gan@....qualcomm.com>
Signed-off-by: Jie Gan <jie.gan@....qualcomm.com>
---
 drivers/hwtracing/coresight/coresight-tpda.c | 15 +++++++++++++++
 drivers/hwtracing/coresight/coresight-tpda.h |  1 +
 2 files changed, 16 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
index cc254d53b8ec..9e623732d1e7 100644
--- a/drivers/hwtracing/coresight/coresight-tpda.c
+++ b/drivers/hwtracing/coresight/coresight-tpda.c
@@ -189,6 +189,18 @@ static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
 		writel_relaxed(0x0, drvdata->base + TPDA_FPID_CR);
 }
 
+static void tpda_enable_post_port(struct tpda_drvdata *drvdata)
+{
+	uint32_t val;
+
+	val = readl_relaxed(drvdata->base + TPDA_SYNCR);
+	/* Clear the mode */
+	val = val & ~TPDA_MODE_CTRL;
+	/* Program the counter value */
+	val = val | 0xFFF;
+	writel_relaxed(val, drvdata->base + TPDA_SYNCR);
+}
+
 static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
 {
 	u32 val;
@@ -227,6 +239,9 @@ static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
 		tpda_enable_pre_port(drvdata);
 
 	ret = tpda_enable_port(drvdata, port);
+	if (!drvdata->csdev->refcnt)
+		tpda_enable_post_port(drvdata);
+
 	CS_LOCK(drvdata->base);
 
 	return ret;
diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h
index b651372d4c88..00d146960d81 100644
--- a/drivers/hwtracing/coresight/coresight-tpda.h
+++ b/drivers/hwtracing/coresight/coresight-tpda.h
@@ -9,6 +9,7 @@
 #define TPDA_CR			(0x000)
 #define TPDA_Pn_CR(n)		(0x004 + (n * 4))
 #define TPDA_FPID_CR		(0x084)
+#define TPDA_SYNCR		(0x08C)
 
 /* Cross trigger FREQ packets timestamp bit */
 #define TPDA_CR_FREQTS		BIT(2)
-- 
2.34.1