This is a note to let you know that I've just added the patch titled
drm/radeon: disable runtime pm in certain cases
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-radeon-disable-runtime-pm-in-certain-cases.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 066f1f0b4719eb4573ef09bfc63c2bbb6f7676ca Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Mon, 31 Oct 2016 10:41:49 -0400
Subject: drm/radeon: disable runtime pm in certain cases
MIME-Version: 1.0
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From: Alex Deucher <alexander.deucher@xxxxxxx>
commit 066f1f0b4719eb4573ef09bfc63c2bbb6f7676ca upstream.
If the platform does not support hybrid graphics or ATPX dGPU
power control.
bug: https://bugzilla.kernel.org/show_bug.cgi?id=51381
Acked-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/radeon_device.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -103,6 +103,14 @@ static const char radeon_family_name[][1
"LAST",
};
+#if defined(CONFIG_VGA_SWITCHEROO)
+bool radeon_has_atpx_dgpu_power_cntl(void);
+bool radeon_is_atpx_hybrid(void);
+#else
+static inline bool radeon_has_atpx_dgpu_power_cntl(void) { return false; }
+static inline bool radeon_is_atpx_hybrid(void) { return false; }
+#endif
+
#define RADEON_PX_QUIRK_DISABLE_PX (1 << 0)
#define RADEON_PX_QUIRK_LONG_WAKEUP (1 << 1)
@@ -159,6 +167,11 @@ static void radeon_device_handle_px_quir
if (rdev->px_quirk_flags & RADEON_PX_QUIRK_DISABLE_PX)
rdev->flags &= ~RADEON_IS_PX;
+
+ /* disable PX is the system doesn't support dGPU power control or hybrid gfx */
+ if (!radeon_is_atpx_hybrid() &&
+ !radeon_has_atpx_dgpu_power_cntl())
+ rdev->flags &= ~RADEON_IS_PX;
}
/**
Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are
queue-4.4/drm-radeon-disable-runtime-pm-in-certain-cases.patch
queue-4.4/drm-amdgpu-disable-runtime-pm-in-certain-cases.patch
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