| From | Ben Hutchings <> | Date | Mon, 14 Nov 2016 00:14:20 +0000 | Subject | [PATCH 3.16 046/346] drm/radeon: add a delay after ATPX dGPU power off |
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3.16.39-rc1 review patch. If anyone has any objections, please let me know.
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From: Alex Deucher <alexander.deucher@amd.com>
commit d814b24fb74cb9797d70cb8053961447c5879a5c 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: Ben Hutchings <ben@decadent.org.uk> --- drivers/gpu/drm/radeon/radeon_atpx_handler.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/gpu/drm/radeon/radeon_atpx_handler.c +++ b/drivers/gpu/drm/radeon/radeon_atpx_handler.c @@ -10,6 +10,7 @@ #include <linux/slab.h> #include <linux/acpi.h> #include <linux/pci.h> +#include <linux/delay.h> #include "radeon_acpi.h" @@ -256,6 +257,10 @@ static int radeon_atpx_set_discrete_stat if (!info) return -EIO; kfree(info); + + /* 200ms delay is required after off */ + if (state == 0) + msleep(200); } return 0; }
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