Commit f81eb1a3 authored Jun 01, 2016 by Alex Deucher

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

parent 8d45f80e

drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}