tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
+7
-3
+4
-2
drivers/hwtracing/intel_th/core.c
+4
-2
drivers/hwtracing/intel_th/core.c
···
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630
thdev->output.port = -1;
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631
thdev->output.scratchpad = subdev->scrpd;
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} else if (subdev->type == INTEL_TH_SWITCH) {
633
-
thdev->host_mode = host_mode;
633
+
thdev->host_mode =
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+
INTEL_TH_CAP(th, host_mode_only) ? true : host_mode;
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th->hub = thdev;
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}
636
637
···
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729
struct intel_th_device *thdev;
731
730
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/* only allow SOURCE and SWITCH devices in host mode */
733
-
if (host_mode && subdev->type == INTEL_TH_OUTPUT)
732
+
if ((INTEL_TH_CAP(th, host_mode_only) || host_mode) &&
733
+
subdev->type == INTEL_TH_OUTPUT)
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734
continue;
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736
/*
+3
-1
drivers/hwtracing/intel_th/intel_th.h
+3
-1
drivers/hwtracing/intel_th/intel_th.h
···
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/**
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* struct intel_th_drvdata - describes hardware capabilities and quirks
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* @tscu_enable: device needs SW to enable time stamping unit
45
+
* @host_mode_only: device can only operate in 'host debugger' mode
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*/
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struct intel_th_drvdata {
47
-
unsigned int tscu_enable : 1;
48
+
unsigned int tscu_enable : 1,
49
+
host_mode_only : 1;
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50
};
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#define INTEL_TH_CAP(_th, _cap) ((_th)->drvdata ? (_th)->drvdata->_cap : 0)