linux-kernel - [GIT PULL 08/10] intel_th: Allow forcing host mode through drvdata

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Message-Id: <20180329111418.9416-9-alexander.shishkin@linux.intel.com>
Date:   Thu, 29 Mar 2018 14:14:16 +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 08/10] intel_th: Allow forcing host mode through drvdata

Some devices can only operate in host mode, so we need means of
communicating this to the core driver on per-device basis. This
adds a flag to drvdata to signal host-only capability to the core.

Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
 drivers/hwtracing/intel_th/core.c     | 6 ++++--
 drivers/hwtracing/intel_th/intel_th.h | 4 +++-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c
index 8f820c182240..da962aa2cef5 100644
--- a/drivers/hwtracing/intel_th/core.c
+++ b/drivers/hwtracing/intel_th/core.c
@@ -630,7 +630,8 @@ intel_th_subdevice_alloc(struct intel_th *th,
 		thdev->output.port = -1;
 		thdev->output.scratchpad = subdev->scrpd;
 	} else if (subdev->type == INTEL_TH_SWITCH) {
-		thdev->host_mode = host_mode;
+		thdev->host_mode =
+			INTEL_TH_CAP(th, host_mode_only) ? true : host_mode;
 		th->hub = thdev;
 	}
 
@@ -729,7 +730,8 @@ static int intel_th_populate(struct intel_th *th)
 		struct intel_th_device *thdev;
 
 		/* only allow SOURCE and SWITCH devices in host mode */
-		if (host_mode && subdev->type == INTEL_TH_OUTPUT)
+		if ((INTEL_TH_CAP(th, host_mode_only) || host_mode) &&
+		    subdev->type == INTEL_TH_OUTPUT)
 			continue;
 
 		/*
diff --git a/drivers/hwtracing/intel_th/intel_th.h b/drivers/hwtracing/intel_th/intel_th.h
index cdeed3b017d0..780206dc9012 100644
--- a/drivers/hwtracing/intel_th/intel_th.h
+++ b/drivers/hwtracing/intel_th/intel_th.h
@@ -42,9 +42,11 @@ struct intel_th_output {
 /**
  * struct intel_th_drvdata - describes hardware capabilities and quirks
  * @tscu_enable:	device needs SW to enable time stamping unit
+ * @host_mode_only:	device can only operate in 'host debugger' mode
  */
 struct intel_th_drvdata {
-	unsigned int	tscu_enable        : 1;
+	unsigned int	tscu_enable        : 1,
+			host_mode_only     : 1;
 };
 
 #define INTEL_TH_CAP(_th, _cap) ((_th)->drvdata ? (_th)->drvdata->_cap : 0)
-- 
2.16.2