From 4046217954d4e79d57d34c56ce42dec4f87e2ce9 Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Mon, 9 Oct 2017 12:03:30 +0200 Subject: [PATCH] drm/etnaviv: reduce reset delay 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 Signed-off-by: Lucas Stach --- drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c index 3e0fcc1fafb5..95ee479c95cb 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c @@ -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; -- GitLab