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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@linux.intel.com>
hifive-unleashed-5.1
Alexander Shishkin 2017-08-23 09:52:00 +03:00
parent 661b0df848
commit 282ffec565
2 changed files with 7 additions and 3 deletions
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6
drivers/hwtracing/intel_th/core.c
View File

@ -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;
/*

4
drivers/hwtracing/intel_th/intel_th.h
View File

@ -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)