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lib/igt_pm: Lib for power management

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Move power management related code to a separate library.
Initially this is done only for workarounds that apply to external
components.  Modify the users of such workarounds accordingly.
This currently involves HD audio and SATA link power management.
For SATA link PM there's also code to save the previous settings,
to allow for resetting the values after we've finished testing.

Signed-off-by: David Weinehall <david.weinehall@intel.com>
Reviewed-by: Marius Vlad <marius.c.vlad@intel.com>
Signed-off-by: Marius Vlad <marius.c.vlad@intel.com>
This commit is contained in:
David Weinehall
2016-02-18 13:08:46 +02:00
committed by Marius Vlad
parent 16038908de
commit 15deba4575
8 changed files with 281 additions and 67 deletions
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tests/pm_lpsp.c
+1 -24
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@@ -31,29 +31,6 @@
#include <unistd.h>
/* We know that if we don't enable audio runtime PM, snd_hda_intel will never
* release its power well refcount, and we'll never reach the LPSP sate. OTOH
* there's no guarantee that it will release the power well if we enable runtime
* PM, but at least we can try. We don't have any assertions since the user may
* not even have snd_hda_intel loaded, which is not a problem. */
static void disable_audio_runtime_pm(void)
{
int fd;
fd = open("/sys/module/snd_hda_intel/parameters/power_save", O_WRONLY);
if (fd >= 0) {
igt_assert_eq(write(fd, "1\n", 2), 2);
close(fd);
}
fd = open("/sys/bus/pci/devices/0000:00:03.0/power/control", O_WRONLY);
if (fd >= 0) {
igt_assert_eq(write(fd, "auto\n", 5), 5);
close(fd);
}
/* Give some time for it to react. */
sleep(1);
}
static bool supports_lpsp(uint32_t devid)
{
return IS_HASWELL(devid) || IS_BROADWELL(devid);
@@ -227,7 +204,7 @@ igt_main
drm_connectors[i] = drmModeGetConnectorCurrent(drm_fd,
drm_res->connectors[i]);
disable_audio_runtime_pm();
igt_pm_enable_audio_runtime_pm();
igt_require(supports_lpsp(devid));