diff options
author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2016-06-22 13:48:21 +0300 |
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committer | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2016-07-01 11:01:01 +0300 |
commit | 142dfeb20209607659ca85f15e7a3dd592a6dd20 (patch) | |
tree | 45cbdde394ba1823df99bc386ac2798ad3a56cd3 /drivers/hwtracing/intel_th/gth.c | |
parent | 8e0469a4f3e647059c0ef8db961140ee25246fbd (diff) | |
download | linux-142dfeb20209607659ca85f15e7a3dd592a6dd20.tar.gz linux-142dfeb20209607659ca85f15e7a3dd592a6dd20.tar.xz |
intel_th: Add runtime power management handling
Currently, an Intel TH (pci) device will be always active, because the
devices on the 'intel_th' bus don't implement runtime pm to track their
usage.
To address this, this patch adds runtime pm support to the 'intel_th'
bus and some additional bits for the hub. The 'output' type device is
in use while a capture is active; the 'source' type device (STH) relies
on its child stm class device for runtime pm tracking.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Diffstat (limited to 'drivers/hwtracing/intel_th/gth.c')
-rw-r--r-- | drivers/hwtracing/intel_th/gth.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/hwtracing/intel_th/gth.c b/drivers/hwtracing/intel_th/gth.c index 9beea0b54231..4106eaf13123 100644 --- a/drivers/hwtracing/intel_th/gth.c +++ b/drivers/hwtracing/intel_th/gth.c @@ -22,6 +22,7 @@ #include <linux/mm.h> #include <linux/slab.h> #include <linux/bitmap.h> +#include <linux/pm_runtime.h> #include "intel_th.h" #include "gth.h" @@ -190,6 +191,11 @@ static ssize_t master_attr_store(struct device *dev, if (old_port >= 0) { gth->master[ma->master] = -1; clear_bit(ma->master, gth->output[old_port].master); + + /* + * if the port is active, program this setting, + * implies that runtime PM is on + */ if (gth->output[old_port].output->active) gth_master_set(gth, ma->master, -1); } @@ -204,7 +210,7 @@ static ssize_t master_attr_store(struct device *dev, set_bit(ma->master, gth->output[port].master); - /* if the port is active, program this setting */ + /* if the port is active, program this setting, see above */ if (gth->output[port].output->active) gth_master_set(gth, ma->master, port); } @@ -326,11 +332,15 @@ static ssize_t output_attr_show(struct device *dev, struct gth_device *gth = oa->gth; size_t count; + pm_runtime_get_sync(dev); + spin_lock(>h->gth_lock); count = snprintf(buf, PAGE_SIZE, "%x\n", gth_output_parm_get(gth, oa->port, oa->parm)); spin_unlock(>h->gth_lock); + pm_runtime_put(dev); + return count; } @@ -346,10 +356,14 @@ static ssize_t output_attr_store(struct device *dev, if (kstrtouint(buf, 16, &config) < 0) return -EINVAL; + pm_runtime_get_sync(dev); + spin_lock(>h->gth_lock); gth_output_parm_set(gth, oa->port, oa->parm, config); spin_unlock(>h->gth_lock); + pm_runtime_put(dev); + return count; } |