patch "intel_th: gth: Fix the window switching sequence" added to char-misc-linus

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

intel_th: gth: Fix the window switching sequence

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 87c0b9c79ec136ea76a14a88d675a746bc6a87f9 Mon Sep 17 00:00:00 2001
From: Alexander Shishkin <[email protected]>
Date: Mon, 28 Oct 2019 09:06:45 +0200
Subject: intel_th: gth: Fix the window switching sequence

Commit 8116db57cf16 ("intel_th: Add switch triggering support") added a trigger assertion of the CTS, but forgot to de-assert it at the end of the sequence. This results in window switches randomly not happening.

Fix that by de-asserting the trigger at the end of the window switch sequence.

---
 drivers/hwtracing/intel_th/gth.c | 3 +++
 1 file changed, 3 insertions(+)

index fa9d34af87ac..f72803a02391 100644
@@ -626,6 +626,9 @@ static void intel_th_gth_switch(struct intel_th_device *thdev,
 	if (!count)
 		dev_dbg(&thdev->dev, "timeout waiting for CTS Trigger\n");
 
+	/* De-assert the trigger */
+	iowrite32(0, gth->base + REG_CTS_CTL);
+
 	intel_th_gth_stop(gth, output, false);
 	intel_th_gth_start(gth, output);
 }

2.23.0