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Commit 282ffec5 authored by Alexander Shishkin's avatar Alexander Shishkin
Browse files

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: default avatarAlexander Shishkin <alexander.shishkin@linux.intel.com>
parent 661b0df8

drivers/hwtracing/intel_th/core.c

+4 −2
Original line number Diff line number Diff line
@@ -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;



		/*

drivers/hwtracing/intel_th/intel_th.h

+3 −1
Original line number Diff line number Diff line
@@ -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)