linux-kernel - [PATCH 3.13 104/163] drm/radeon: don't reset dma on NI/SI init

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Message-Id: <1412888588-26755-105-git-send-email-kamal@canonical.com>
Date:	Thu,  9 Oct 2014 14:02:09 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Alex Deucher <alexander.deucher@....com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 104/163] drm/radeon: don't reset dma on NI/SI init

3.13.11.9 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deucher@....com>

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@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 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 bdeb65e..ddc946b 100644
--- a/drivers/gpu/drm/radeon/ni_dma.c
+++ b/drivers/gpu/drm/radeon/ni_dma.c
@@ -120,12 +120,6 @@ 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];
-- 
1.9.1

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