This is a note to let you know that I've just added the patch titled
drm/radeon: SDMA fix hibernation (CI GPU family).
to the 4.1-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-sdma-fix-hibernation-ci-gpu-family.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 2ba8d1bb8f6b589037f7db1f01144fc80750e8f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= <[email protected]>
Date: Fri, 19 Jun 2015 10:32:16 -0400
Subject: drm/radeon: SDMA fix hibernation (CI GPU family).
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From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= <[email protected]>
commit 2ba8d1bb8f6b589037f7db1f01144fc80750e8f7 upstream.
In order for hibernation to reliably work we need to properly turn
off the SDMA block, sadly after numerous attemps i haven't not found
proper sequence for clean and full shutdown. So simply reset both
SDMA block, this makes hibernation works reliably on sea island GPU
family (CI)
Hibernation and suspend to ram were tested (several times) on :
Bonaire
Hawaii
Mullins
Kaveri
Kabini
Signed-off-by: Jérôme Glisse <[email protected]>
Reviewed-by: Christian König <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/gpu/drm/radeon/cik_sdma.c | 11 +++++++++++
1 file changed, 11 insertions(+)
--- a/drivers/gpu/drm/radeon/cik_sdma.c
+++ b/drivers/gpu/drm/radeon/cik_sdma.c
@@ -268,6 +268,17 @@ static void cik_sdma_gfx_stop(struct rad
}
rdev->ring[R600_RING_TYPE_DMA_INDEX].ready = false;
rdev->ring[CAYMAN_RING_TYPE_DMA1_INDEX].ready = false;
+
+ /* FIXME use something else than big hammer but after few days can not
+ * seem to find good combination so reset SDMA blocks as it seems we
+ * do not shut them down properly. This fix hibernation and does not
+ * affect suspend to ram.
+ */
+ WREG32(SRBM_SOFT_RESET, SOFT_RESET_SDMA | SOFT_RESET_SDMA1);
+ (void)RREG32(SRBM_SOFT_RESET);
+ udelay(50);
+ WREG32(SRBM_SOFT_RESET, 0);
+ (void)RREG32(SRBM_SOFT_RESET);
}
/**
Patches currently in stable-queue which might be from [email protected] are
queue-4.1/drm-radeon-compute-ring-fix-hibernation-ci-gpu-family-v2.patch
queue-4.1/drm-radeon-sdma-fix-hibernation-ci-gpu-family.patch
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