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drm/radeon: add a delay after ATPX dGPU power off

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commit d814b24fb7 upstream.

ATPX dGPU power control requires a 200ms delay between
power off and on.  This should fix dGPU failures on
resume from power off.

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alex Deucher
2016-06-01 12:58:36 -04:00
committed by Greg Kroah-Hartman
parent 4925cf140f
commit ada3815fab
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/radeon/radeon_atpx_handler.c
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@@ -10,6 +10,7 @@
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include "radeon_acpi.h"
@@ -255,6 +256,10 @@ static int radeon_atpx_set_discrete_state(struct radeon_atpx *atpx, u8 state)
if (!info)
return -EIO;
kfree(info);
/* 200ms delay is required after off */
if (state == 0)
msleep(200);
}
return 0;
}