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Commit 30310d40 authored by Tom St Denis's avatar Tom St Denis Committed by Greg Kroah-Hartman
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drm/amd/amdgpu: Correct VRAM width for APUs with GMC9 



[ 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: default avatarTom St Denis <tom.stdenis@amd.com>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5b715737

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

+4 −1
Original line number Diff line number Diff line
@@ -456,6 +456,9 @@ 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 */

		if (adev->flags & AMD_IS_APU)

			chansize = 64;

		else

			chansize = 128;



		tmp = RREG32_SOC15(DF, 0, mmDF_CS_AON0_DramBaseAddress0);