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tests/pm_rps: vlv: wait for freq to settle

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At least on VLV when forcing a new GT frequency by writing to the
min/max freq sysfs entries the kernel doesn't wait until the new
frequency settles, so the subsequent readback check might fail. To fix
this wait until the current frequency is between the min/max values
using a 10ms timeout.

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Imre Deak <imre.deak@intel.com>
This commit is contained in:
Imre Deak 2014-12-04 16:40:19 +02:00
parent 470071d4ab
commit aabf2d0952
1 changed files with 34 additions and 0 deletions
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34
tests/pm_rps.c
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@ -34,6 +34,7 @@
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include <time.h>
#include <sys/wait.h>
#include "drmtest.h"
@ -87,6 +88,38 @@ static void read_freqs(int *freqs)
freqs[i] = readval(stuff[i].filp);
}
static void nsleep(unsigned long ns)
{
struct timespec ts;
int ret;
ts.tv_sec = 0;
ts.tv_nsec = ns;
do {
struct timespec rem;
ret = nanosleep(&ts, &rem);
igt_assert(ret == 0 || errno == EINTR);
ts = rem;
} while (ret && errno == EINTR);
}
static void wait_freq_settle(void)
{
int timeout = 10;
while (1) {
int freqs[NUMFREQ];
read_freqs(freqs);
if (freqs[CUR] >= freqs[MIN] && freqs[CUR] <= freqs[MAX])
break;
nsleep(1000000);
if (!timeout--)
break;
}
}
static int do_writeval(FILE *filp, int val, int lerrno)
{
int ret, orig;
@ -102,6 +135,7 @@ static int do_writeval(FILE *filp, int val, int lerrno)
} else {
/* Expecting no error */
igt_assert_neq(ret, 0);
wait_freq_settle();
igt_assert(readval(filp) == val);
}