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drm/radeon: fix resume on some rs4xx boards (v2)

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commit acf88deb8d upstream.

Setting MC_MISC_CNTL.GART_INDEX_REG_EN causes hangs on
some boards on resume.  The systems seem to work fine
without touching this bit so leave it as is.

v2: read-modify-write the GART_INDEX_REG_EN bit.
I suspect the problem is that we are losing the other
settings in the register.

fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=52952

Reported-by: Ondrej Zary <linux@rainbow-software.org>
Tested-by: Daniel Tobias <dan.g.tob@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alex Deucher 2013-08-26 17:52:12 -04:00 committed by Greg Kroah-Hartman
parent da2f15e84f
commit b805676fd8
1 changed files with 6 additions and 3 deletions
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9
drivers/gpu/drm/radeon/rs400.c
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@ -174,10 +174,13 @@ int rs400_gart_enable(struct radeon_device *rdev)
/* FIXME: according to doc we should set HIDE_MMCFG_BAR=0,
* AGPMODE30=0 & AGP30ENHANCED=0 in NB_CNTL */
if ((rdev->family == CHIP_RS690) || (rdev->family == CHIP_RS740)) {
WREG32_MC(RS480_MC_MISC_CNTL,
(RS480_GART_INDEX_REG_EN | RS690_BLOCK_GFX_D3_EN));
tmp = RREG32_MC(RS480_MC_MISC_CNTL);
tmp |= RS480_GART_INDEX_REG_EN | RS690_BLOCK_GFX_D3_EN;
WREG32_MC(RS480_MC_MISC_CNTL, tmp);
} else {
WREG32_MC(RS480_MC_MISC_CNTL, RS480_GART_INDEX_REG_EN);
tmp = RREG32_MC(RS480_MC_MISC_CNTL);
tmp |= RS480_GART_INDEX_REG_EN;
WREG32_MC(RS480_MC_MISC_CNTL, tmp);
}
/* Enable gart */
WREG32_MC(RS480_AGP_ADDRESS_SPACE_SIZE, (RS480_GART_EN | size_reg));