drm/radeon: add a bios scratch asic hung helper

Used by all asic families from r600+.
Flag for the vbios and later instances of the driver
that the GPU is hung.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/evergreen.c

@@ -2433,6 +2433,8 @@ static int evergreen_gpu_soft_reset(struct radeon_device *rdev, u32 reset_mask)
 
 	dev_info(rdev->dev, "GPU softreset: 0x%08X\n", reset_mask);
 
+	r600_set_bios_scratch_engine_hung(rdev, true);
+
 	evergreen_mc_stop(rdev, &save);
 	if (evergreen_mc_wait_for_idle(rdev)) {
 		dev_warn(rdev->dev, "Wait for MC idle timedout !\n");
@@ -2448,6 +2450,9 @@ static int evergreen_gpu_soft_reset(struct radeon_device *rdev, u32 reset_mask)
 	udelay(50);
 
 	evergreen_mc_resume(rdev, &save);
+
+	r600_set_bios_scratch_engine_hung(rdev, false);
+
 	return 0;
 }
 

drivers/gpu/drm/radeon/ni.c

@@ -1422,6 +1422,8 @@ static int cayman_gpu_soft_reset(struct radeon_device *rdev, u32 reset_mask)
 	if (reset_mask == 0)
 		return 0;
 
+	r600_set_bios_scratch_engine_hung(rdev, true);
+
 	dev_info(rdev->dev, "GPU softreset: 0x%08X\n", reset_mask);
 
 	dev_info(rdev->dev, "  VM_CONTEXT0_PROTECTION_FAULT_ADDR   0x%08X\n",
@@ -1448,6 +1450,9 @@ static int cayman_gpu_soft_reset(struct radeon_device *rdev, u32 reset_mask)
 	udelay(50);
 
 	evergreen_mc_resume(rdev, &save);
+
+	r600_set_bios_scratch_engine_hung(rdev, false);
+
 	return 0;
 }
 

drivers/gpu/drm/radeon/r600.c

@@ -1254,6 +1254,18 @@ void r600_vram_scratch_fini(struct radeon_device *rdev)
 	radeon_bo_unref(&rdev->vram_scratch.robj);
 }
 
+void r600_set_bios_scratch_engine_hung(struct radeon_device *rdev, bool hung)
+{
+	u32 tmp = RREG32(R600_BIOS_3_SCRATCH);
+
+	if (hung)
+		tmp |= ATOM_S3_ASIC_GUI_ENGINE_HUNG;
+	else
+		tmp &= ~ATOM_S3_ASIC_GUI_ENGINE_HUNG;
+
+	WREG32(R600_BIOS_3_SCRATCH, tmp);
+}
+
 /* We doesn't check that the GPU really needs a reset we simply do the
  * reset, it's up to the caller to determine if the GPU needs one. We
  * might add an helper function to check that.
@@ -1389,6 +1401,8 @@ static int r600_gpu_soft_reset(struct radeon_device *rdev, u32 reset_mask)
 
 	dev_info(rdev->dev, "GPU softreset: 0x%08X\n", reset_mask);
 
+	r600_set_bios_scratch_engine_hung(rdev, true);
+
 	rv515_mc_stop(rdev, &save);
 	if (r600_mc_wait_for_idle(rdev)) {
 		dev_warn(rdev->dev, "Wait for MC idle timedout !\n");
@@ -1404,6 +1418,9 @@ static int r600_gpu_soft_reset(struct radeon_device *rdev, u32 reset_mask)
 	mdelay(1);
 
 	rv515_mc_resume(rdev, &save);
+
+	r600_set_bios_scratch_engine_hung(rdev, false);
+
 	return 0;
 }
 

drivers/gpu/drm/radeon/radeon.h

@@ -1860,6 +1860,7 @@ void radeon_ring_write(struct radeon_ring *ring, uint32_t v);
 /* Common functions */
 /* AGP */
 extern int radeon_gpu_reset(struct radeon_device *rdev);
+extern void r600_set_bios_scratch_engine_hung(struct radeon_device *rdev, bool hung);
 extern void radeon_agp_disable(struct radeon_device *rdev);
 extern int radeon_modeset_init(struct radeon_device *rdev);
 extern void radeon_modeset_fini(struct radeon_device *rdev);

drivers/gpu/drm/radeon/si.c

@@ -2231,6 +2231,8 @@ static int si_gpu_soft_reset(struct radeon_device *rdev, u32 reset_mask)
 	dev_info(rdev->dev, "  VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x%08X\n",
 		 RREG32(VM_CONTEXT1_PROTECTION_FAULT_STATUS));
 
+	r600_set_bios_scratch_engine_hung(rdev, true);
+
 	evergreen_mc_stop(rdev, &save);
 	if (radeon_mc_wait_for_idle(rdev)) {
 		dev_warn(rdev->dev, "Wait for MC idle timedout !\n");
@@ -2246,6 +2248,9 @@ static int si_gpu_soft_reset(struct radeon_device *rdev, u32 reset_mask)
 	udelay(50);
 
 	evergreen_mc_resume(rdev, &save);
+
+	r600_set_bios_scratch_engine_hung(rdev, false);
+
 	return 0;
 }