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drm/etnaviv: reduce reset delay

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After reset assertion, we only have to wait for the reset signals to
propagate through the GPU before deasserting the reset again. A few
hundred clock cycles should be more than enough. Replace the msleep(1),
which can actually take about 30 ms on i.MX6Q in some configurations,
with an usleep_range of a few microseconds. If the delay was too short,
the FE would not be idle afterwards, and the reset would be retried.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
This commit is contained in:
Philipp Zabel 2017-10-09 12:03:30 +02:00 committed by Lucas Stach
parent 13cde9f4c6
commit 4046217954
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/etnaviv/etnaviv_gpu.c
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@ -456,7 +456,7 @@ static int etnaviv_hw_reset(struct etnaviv_gpu *gpu)
gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, control);
/* wait for reset. */
msleep(1);
usleep_range(10, 20);
/* reset soft reset bit. */
control &= ~VIVS_HI_CLOCK_CONTROL_SOFT_RESET;