linux-kernel - [GIT PULL 06/10] intel_th: Don't touch switch routing in host mode

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Message-Id: <20180329111418.9416-7-alexander.shishkin@linux.intel.com>
Date:   Thu, 29 Mar 2018 14:14:14 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Greg KH <greg@...ah.com>
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Chunyan Zhang <zhang.chunyan@...aro.org>,
        linux-kernel@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [GIT PULL 06/10] intel_th: Don't touch switch routing in host mode

When the Trace Hub is operating in Host Debugger mode, it is up to the
debugger to configure master routing even for the software sources. Do
not do this in the driver in this case.

Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
 drivers/hwtracing/intel_th/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c
index 8e4f5fd8a43e..d295b221e0bc 100644
--- a/drivers/hwtracing/intel_th/core.c
+++ b/drivers/hwtracing/intel_th/core.c
@@ -930,6 +930,10 @@ int intel_th_set_output(struct intel_th_device *thdev,
 	struct intel_th_device *hub = to_intel_th_hub(thdev);
 	struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
 
+	/* In host mode, this is up to the external debugger, do nothing. */
+	if (hub->host_mode)
+		return 0;
+
 	if (!hubdrv->set_output)
 		return -ENOTSUPP;
 
-- 
2.16.2