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Message-Id: <1471793510-13022-79-git-send-email-w@1wt.eu> Date: Sun, 21 Aug 2016 17:30:08 +0200 From: Willy Tarreau <w@....eu> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Alex Deucher <alexander.deucher@....com>, Willy Tarreau <w@....eu> Subject: [PATCH 3.10 078/180] drm/radeon: add a delay after ATPX dGPU power off From: Alex Deucher <alexander.deucher@....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@....com> Acked-by: Christian König <christian.koenig@....com> Signed-off-by: Alex Deucher <alexander.deucher@....com> Cc: stable@...r.kernel.org Signed-off-by: Willy Tarreau <w@....eu> --- 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 8c44ef5..a7e1893 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" @@ -252,6 +253,10 @@ 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; } -- 2.8.0.rc2.1.gbe9624a
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