[patch added to the 3.12 stable tree] drm/radeon: don't reset dma on NI/SI init

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From: Alex Deucher <alexander.deucher@xxxxxxx>

This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.

===============

commit 31a25e2caf9367365fcb0e57fd8fa5a42e9b73e4 upstream.

Otherwise we may lose the DMA golden settings which can
lead to hangs, etc.

bug:
https://www.libreoffice.org/bugzilla/show_bug.cgi?id=83500

Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
 drivers/gpu/drm/radeon/ni_dma.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/gpu/drm/radeon/ni_dma.c b/drivers/gpu/drm/radeon/ni_dma.c
index dd6e9688fbef..d0e4ab12f2e5 100644
--- a/drivers/gpu/drm/radeon/ni_dma.c
+++ b/drivers/gpu/drm/radeon/ni_dma.c
@@ -119,12 +119,6 @@ int cayman_dma_resume(struct radeon_device *rdev)
 	u32 reg_offset, wb_offset;
 	int i, r;
 
-	/* Reset dma */
-	WREG32(SRBM_SOFT_RESET, SOFT_RESET_DMA | SOFT_RESET_DMA1);
-	RREG32(SRBM_SOFT_RESET);
-	udelay(50);
-	WREG32(SRBM_SOFT_RESET, 0);
-
 	for (i = 0; i < 2; i++) {
 		if (i == 0) {
 			ring = &rdev->ring[R600_RING_TYPE_DMA_INDEX];
-- 
2.1.1

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