Patch "coresight: Fix disabling of CoreSight TPIU" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

coresight: Fix disabling of CoreSight TPIU

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
coresight-fix-disabling-of-coresight-tpiu.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Robert Walker <[email protected]>
Date: Mon, 18 Dec 2017 11:05:44 -0700
Subject: coresight: Fix disabling of CoreSight TPIU

From: Robert Walker <[email protected]>

[ Upstream commit 11595db8e17faaa05fadc25746c870e31276962f ]

The CoreSight TPIU should be disabled when tracing to other sinks to allow them to operate at full bandwidth.

This patch fixes tpiu_disable_hw() to correctly disable the TPIU by configuring the TPIU to stop on flush, initiating a manual flush, waiting for the flush to complete and then waits for the TPIU to indicate it has stopped.

---
 drivers/hwtracing/coresight/coresight-tpiu.c |   13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

@@ -46,8 +46,11 @@
 #define TPIU_ITATBCTR0		0xef8
 
 /** register definition **/
+/* FFSR - 0x300 */
+#define FFSR_FT_STOPPED		BIT(1)
 /* FFCR - 0x304 */
 #define FFCR_FON_MAN		BIT(6)
+#define FFCR_STOP_FI		BIT(12)
 
 /**
  * @base:	memory mapped base address for this component.

@@ -85,10 +88,14 @@ static void tpiu_disable_hw(struct tpiu_
 {
 	CS_UNLOCK(drvdata->base);
 
-	/* Clear formatter controle reg. */
-	writel_relaxed(0x0, drvdata->base + TPIU_FFCR);
+	/* Clear formatter and stop on flush */
+	writel_relaxed(FFCR_STOP_FI, drvdata->base + TPIU_FFCR);
 	/* Generate manual flush */
-	writel_relaxed(FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
+	writel_relaxed(FFCR_STOP_FI | FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
+	/* Wait for flush to complete */
+	coresight_timeout(drvdata->base, TPIU_FFCR, FFCR_FON_MAN, 0);
+	/* Wait for formatter to stop */
+	coresight_timeout(drvdata->base, TPIU_FFSR, FFSR_FT_STOPPED, 1);
 
 	CS_LOCK(drvdata->base);
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/coresight-fix-disabling-of-coresight-tpiu.patch