From: Alex Deucher <alexander.deucher@amd.com>
Date: Tue, 1 Nov 2016 13:14:45 -0400
Subject: drm/amdgpu/gmc7: use the vram location programmed by the vbios
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Git-commit: e0205a7156a62bfcaa3f3f2ed556faf3c9b38aad
Patch-mainline: v4.14-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

This makes mc programming much simpler in future patches.

Since evergreen, the vbios has been programming the fb location
to the proper vram size.  The only reason to reprogram it would
be to change the location.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
@@ -242,13 +242,16 @@ static int gmc_v7_0_mc_load_microcode(st
 static void gmc_v7_0_vram_gtt_location(struct amdgpu_device *adev,
 				       struct amdgpu_mc *mc)
 {
+	u64 base = RREG32(mmMC_VM_FB_LOCATION) & 0xFFFF;
+	base <<= 24;
+
 	if (mc->mc_vram_size > 0xFFC0000000ULL) {
 		/* leave room for at least 1024M GTT */
 		dev_warn(adev->dev, "limiting VRAM\n");
 		mc->real_vram_size = 0xFFC0000000ULL;
 		mc->mc_vram_size = 0xFFC0000000ULL;
 	}
-	amdgpu_vram_location(adev, &adev->mc, 0);
+	amdgpu_vram_location(adev, &adev->mc, base);
 	adev->mc.gtt_base_align = 0;
 	amdgpu_gtt_location(adev, mc);
 }