From: Alex Deucher <[email protected]> 3.12-stable review patch. If anyone has any objections, please let me know.
=============== 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 <[email protected]> Acked-by: Christian König <[email protected]> Signed-off-by: Alex Deucher <[email protected]> Signed-off-by: Jiri Slaby <[email protected]> --- drivers/gpu/drm/radeon/radeon_atpx_handler.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/radeon/radeon_atpx_handler.c b/drivers/gpu/drm/radeon/radeon_atpx_handler.c index 7c6e3fd70e65..97dc62140fc9 100644 --- a/drivers/gpu/drm/radeon/radeon_atpx_handler.c +++ b/drivers/gpu/drm/radeon/radeon_atpx_handler.c @@ -11,6 +11,7 @@ #include <acpi/acpi.h> #include <acpi/acpi_bus.h> #include <linux/pci.h> +#include <linux/delay.h> #include "radeon_acpi.h" @@ -253,6 +254,10 @@ 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; } -- 2.9.3
