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

From: Alexander Shishkin
Date: Thu Mar 29 2018 - 07:15:42 EST


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@xxxxxxxxxxxxxxx>
---
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