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

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>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2016-06-01 12:54:33 -04:00
parent 8d45f80ed0
commit f81eb1a349
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
View File

@ -10,6 +10,7 @@
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include "amd_acpi.h"
@ -271,6 +272,10 @@ static int amdgpu_atpx_set_discrete_state(struct amdgpu_atpx *atpx, u8 state)
if (!info)
return -EIO;
kfree(info);
/* 200ms delay is required after off */
if (state == 0)
msleep(200);
}
return 0;
}