[PATCH 1/4] drm/amdgpu/gmc6: disable legacy vga features in gmc init (v2)

[Alex Deucher]

Needs to be done when the MC is set up.

v2: make consistent with other asics

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
index 117c4835..ab0a104 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
@@ -249,7 +249,19 @@ static void gmc_v6_0_mc_program(struct amdgpu_device *adev)
 		dev_warn(adev->dev, "Wait for MC idle timedout !\n");
 	}
 
-	WREG32(mmVGA_HDP_CONTROL, VGA_HDP_CONTROL__VGA_MEMORY_DISABLE_MASK);
+	if (adev->mode_info.num_crtc) {
+		u32 tmp;
+
+		/* Lockout access through VGA aperture*/
+		tmp = RREG32(mmVGA_HDP_CONTROL);
+		tmp |= VGA_HDP_CONTROL__VGA_MEMORY_DISABLE_MASK;
+		WREG32(mmVGA_HDP_CONTROL, tmp);
+
+		/* disable VGA render */
+		tmp = RREG32(mmVGA_RENDER_CONTROL);
+		tmp &= ~VGA_VSTATUS_CNTL;
+		WREG32(mmVGA_RENDER_CONTROL, tmp);
+	}
 	/* Update configuration */
 	WREG32(mmMC_VM_SYSTEM_APERTURE_LOW_ADDR,
 	       adev->mc.vram_start >> 12);
-- 
2.5.5