Commit 82d0ece9 authored Feb 26, 2018 by Tom St Denis Committed by Alex Deucher Feb 28, 2018

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



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>

parent f812dec5

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

+4 −1

Original line number	Diff line number	Diff line
		@@ -682,6 +682,9 @@ 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);