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drm/amd/amdgpu: Correct VRAM width for APUs with GMC9

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[ Upstream commit 585b7f161c85bd5ca675b97580faf21c506541e3 ]

DDR4 has a 64-bit width not 128-bits.  It was reporting
twice the width.  Tested with my Ryzen 2400G.

Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tom St Denis 2018-02-26 09:09:26 -05:00 committed by Greg Kroah-Hartman
parent 5b71573794
commit 30310d4077
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
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@ -456,7 +456,10 @@ static int gmc_v9_0_mc_init(struct amdgpu_device *adev)
adev->mc.vram_width = amdgpu_atomfirmware_get_vram_width(adev);
if (!adev->mc.vram_width) {
/* hbm memory channel size */
chansize = 128;
if (adev->flags & AMD_IS_APU)
chansize = 64;
else
chansize = 128;
tmp = RREG32_SOC15(DF, 0, mmDF_CS_AON0_DramBaseAddress0);
tmp &= DF_CS_AON0_DramBaseAddress0__IntLvNumChan_MASK;