From 282ffec565c2e9fe18bbb48c19767cccd2437f11 Mon Sep 17 00:00:00 2001 From: Alexander Shishkin Date: Wed, 23 Aug 2017 09:52:00 +0300 Subject: [PATCH] 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 --- 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 8f820c1..da962aa 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 cdeed3b..780206d 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) -- 2.7.4