[PATCH 6/7] drm/amdgpu: program AGP aperture as frame buffer when ZFB is enabled

[Alex Deucher]

From: Hawking Zhang <Hawking.Zhang at amd.com>

Signed-off-by: Hawking Zhang <Hawking.Zhang at amd.com>
Acked-by: John Bridgman <john.bridgman at amd.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Feifei Xu <Feifei.Xu at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c | 19 +++++++++++++++----
 drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c  | 19 +++++++++++++++----
 2 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c
index 0d72f52a41b6..3689f1d43685 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c
@@ -71,10 +71,21 @@ static void gfxhub_v1_0_init_system_aperture_regs(struct amdgpu_device *adev)
 {
 	uint64_t value;
 
-	/* Disable AGP. */
-	WREG32_SOC15(GC, 0, mmMC_VM_AGP_BASE, 0);
-	WREG32_SOC15(GC, 0, mmMC_VM_AGP_TOP, 0);
-	WREG32_SOC15(GC, 0, mmMC_VM_AGP_BOT, 0xFFFFFFFF);
+	if (adev->gmc.zfb_size > 0) {
+		/* Disable LFB */
+		WREG32_SOC15(GC, 0, mmMC_VM_FB_LOCATION_TOP, 0);
+		WREG32_SOC15(GC, 0, mmMC_VM_FB_LOCATION_BASE, 0x00FFFFFF);
+
+		/* Enable AGP */
+		WREG32_SOC15(GC, 0, mmMC_VM_AGP_BASE, adev->gmc.zfb_phys_addr >> 24);
+		WREG32_SOC15(GC, 0, mmMC_VM_AGP_TOP, adev->gmc.vram_end >> 24);
+		WREG32_SOC15(GC, 0, mmMC_VM_AGP_BOT, adev->gmc.vram_start >> 24);
+	} else {
+		/* Disable AGP. */
+		WREG32_SOC15(GC, 0, mmMC_VM_AGP_BASE, 0);
+		WREG32_SOC15(GC, 0, mmMC_VM_AGP_TOP, 0);
+		WREG32_SOC15(GC, 0, mmMC_VM_AGP_BOT, 0xFFFFFFFF);
+	}
 
 	/* Program the system aperture low logical page number. */
 	WREG32_SOC15(GC, 0, mmMC_VM_SYSTEM_APERTURE_LOW_ADDR,
diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c
index e9289a6b61de..dc0157093635 100644
--- a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c
@@ -82,10 +82,21 @@ static void mmhub_v1_0_init_system_aperture_regs(struct amdgpu_device *adev)
 	uint64_t value;
 	uint32_t tmp;
 
-	/* Disable AGP. */
-	WREG32_SOC15(MMHUB, 0, mmMC_VM_AGP_BASE, 0);
-	WREG32_SOC15(MMHUB, 0, mmMC_VM_AGP_TOP, 0);
-	WREG32_SOC15(MMHUB, 0, mmMC_VM_AGP_BOT, 0x00FFFFFF);
+	if (adev->gmc.zfb_size > 0) {
+		/* Disable LFB */
+		WREG32_SOC15(MMHUB, 0, mmMC_VM_FB_LOCATION_TOP, 0);
+		WREG32_SOC15(MMHUB, 0, mmMC_VM_FB_LOCATION_BASE, 0x00FFFFFF);
+
+		/* Enable AGP */
+		WREG32_SOC15(MMHUB, 0, mmMC_VM_AGP_BASE, adev->gmc.zfb_phys_addr >> 24);
+		WREG32_SOC15(MMHUB, 0, mmMC_VM_AGP_TOP, adev->gmc.vram_end >> 24);
+		WREG32_SOC15(MMHUB, 0, mmMC_VM_AGP_BOT, adev->gmc.vram_start >> 24);
+	} else {
+		/* Disable AGP. */
+		WREG32_SOC15(MMHUB, 0, mmMC_VM_AGP_BASE, 0);
+		WREG32_SOC15(MMHUB, 0, mmMC_VM_AGP_TOP, 0);
+		WREG32_SOC15(MMHUB, 0, mmMC_VM_AGP_BOT, 0x00FFFFFF);
+	}
 
 	/* Program the system aperture low logical page number. */
 	WREG32_SOC15(MMHUB, 0, mmMC_VM_SYSTEM_APERTURE_LOW_ADDR,
-- 
2.13.6