drm/amd/amdgpu: add vce3.0 clock gating support. (v2)

v2: fix grbm locking
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Jammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: Eric Huang <JinHuiEric.Huang@amd.com>

drivers/gpu/drm/amd/amdgpu/vce_v3_0.c

@@ -103,6 +103,108 @@ static void vce_v3_0_ring_set_wptr(struct amdgpu_ring *ring)
 		WREG32(mmVCE_RB_WPTR2, ring->wptr);
 }
 
+static void vce_v3_0_override_vce_clock_gating(struct amdgpu_device *adev, bool override)
+{
+	u32 tmp, data;
+
+	tmp = data = RREG32(mmVCE_RB_ARB_CTRL);
+	if (override)
+		data |= VCE_RB_ARB_CTRL__VCE_CGTT_OVERRIDE_MASK;
+	else
+		data &= ~VCE_RB_ARB_CTRL__VCE_CGTT_OVERRIDE_MASK;
+
+	if (tmp != data)
+		WREG32(mmVCE_RB_ARB_CTRL, data);
+}
+
+static void vce_v3_0_set_vce_sw_clock_gating(struct amdgpu_device *adev,
+					     bool gated)
+{
+	u32 tmp, data;
+	/* Set Override to disable Clock Gating */
+	vce_v3_0_override_vce_clock_gating(adev, true);
+
+	if (!gated) {
+		/* Force CLOCK ON for VCE_CLOCK_GATING_B,
+		 * {*_FORCE_ON, *_FORCE_OFF} = {1, 0}
+		 * VREG can be FORCE ON or set to Dynamic, but can't be OFF
+		 */
+		tmp = data = RREG32(mmVCE_CLOCK_GATING_B);
+		data |= 0x1ff;
+		data &= ~0xef0000;
+		if (tmp != data)
+			WREG32(mmVCE_CLOCK_GATING_B, data);
+
+		/* Force CLOCK ON for VCE_UENC_CLOCK_GATING,
+		 * {*_FORCE_ON, *_FORCE_OFF} = {1, 0}
+		 */
+		tmp = data = RREG32(mmVCE_UENC_CLOCK_GATING);
+		data |= 0x3ff000;
+		data &= ~0xffc00000;
+		if (tmp != data)
+			WREG32(mmVCE_UENC_CLOCK_GATING, data);
+
+		/* set VCE_UENC_CLOCK_GATING_2 */
+		tmp = data = RREG32(mmVCE_UENC_CLOCK_GATING_2);
+		data |= 0x2;
+		data &= ~0x2;
+		if (tmp != data)
+			WREG32(mmVCE_UENC_CLOCK_GATING_2, data);
+
+		/* Force CLOCK ON for VCE_UENC_REG_CLOCK_GATING */
+		tmp = data = RREG32(mmVCE_UENC_REG_CLOCK_GATING);
+		data |= 0x37f;
+		if (tmp != data)
+			WREG32(mmVCE_UENC_REG_CLOCK_GATING, data);
+
+		/* Force VCE_UENC_DMA_DCLK_CTRL Clock ON */
+		tmp = data = RREG32(mmVCE_UENC_DMA_DCLK_CTRL);
+		data |= VCE_UENC_DMA_DCLK_CTRL__WRDMCLK_FORCEON_MASK |
+				VCE_UENC_DMA_DCLK_CTRL__RDDMCLK_FORCEON_MASK |
+				VCE_UENC_DMA_DCLK_CTRL__REGCLK_FORCEON_MASK  |
+				0x8;
+		if (tmp != data)
+			WREG32(mmVCE_UENC_DMA_DCLK_CTRL, data);
+	} else {
+		/* Force CLOCK OFF for VCE_CLOCK_GATING_B,
+		 * {*, *_FORCE_OFF} = {*, 1}
+		 * set VREG to Dynamic, as it can't be OFF
+		 */
+		tmp = data = RREG32(mmVCE_CLOCK_GATING_B);
+		data &= ~0x80010;
+		data |= 0xe70008;
+		if (tmp != data)
+			WREG32(mmVCE_CLOCK_GATING_B, data);
+		/* Force CLOCK OFF for VCE_UENC_CLOCK_GATING,
+		 * Force ClOCK OFF takes precedent over Force CLOCK ON setting.
+		 * {*_FORCE_ON, *_FORCE_OFF} = {*, 1}
+		 */
+		tmp = data = RREG32(mmVCE_UENC_CLOCK_GATING);
+		data |= 0xffc00000;
+		if (tmp != data)
+			WREG32(mmVCE_UENC_CLOCK_GATING, data);
+		/* Set VCE_UENC_CLOCK_GATING_2 */
+		tmp = data = RREG32(mmVCE_UENC_CLOCK_GATING_2);
+		data |= 0x10000;
+		if (tmp != data)
+			WREG32(mmVCE_UENC_CLOCK_GATING_2, data);
+		/* Set VCE_UENC_REG_CLOCK_GATING to dynamic */
+		tmp = data = RREG32(mmVCE_UENC_REG_CLOCK_GATING);
+		data &= ~0xffc00000;
+		if (tmp != data)
+			WREG32(mmVCE_UENC_REG_CLOCK_GATING, data);
+		/* Set VCE_UENC_DMA_DCLK_CTRL CG always in dynamic mode */
+		tmp = data = RREG32(mmVCE_UENC_DMA_DCLK_CTRL);
+		data &= ~(VCE_UENC_DMA_DCLK_CTRL__WRDMCLK_FORCEON_MASK |
+				VCE_UENC_DMA_DCLK_CTRL__RDDMCLK_FORCEON_MASK |
+				VCE_UENC_DMA_DCLK_CTRL__REGCLK_FORCEON_MASK  |
+				0x8);
+		if (tmp != data)
+			WREG32(mmVCE_UENC_DMA_DCLK_CTRL, data);
+	}
+	vce_v3_0_override_vce_clock_gating(adev, false);
+}
+
 /**
  * vce_v3_0_start - start VCE block
  *
@@ -121,7 +223,7 @@ static int vce_v3_0_start(struct amdgpu_device *adev)
 		if (adev->vce.harvest_config & (1 << idx))
 			continue;
 
-		if(idx == 0)
+		if (idx == 0)
 			WREG32_P(mmGRBM_GFX_INDEX, 0,
 				~GRBM_GFX_INDEX__VCE_INSTANCE_MASK);
 		else
@@ -174,6 +276,10 @@ static int vce_v3_0_start(struct amdgpu_device *adev)
 		/* clear BUSY flag */
 		WREG32_P(mmVCE_STATUS, 0, ~1);
 
+		/* Set Clock-Gating off */
+		if (adev->cg_flags & AMDGPU_CG_SUPPORT_VCE_MGCG)
+			vce_v3_0_set_vce_sw_clock_gating(adev, false);
+
 		if (r) {
 			DRM_ERROR("VCE not responding, giving up!!!\n");
 			mutex_unlock(&adev->grbm_idx_mutex);
@@ -609,6 +715,47 @@ static int vce_v3_0_process_interrupt(struct amdgpu_device *adev,
 static int vce_v3_0_set_clockgating_state(void *handle,
 					  enum amd_clockgating_state state)
 {
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+	bool enable = (state == AMD_CG_STATE_GATE) ? true : false;
+	int i;
+
+	if (!(adev->cg_flags & AMDGPU_CG_SUPPORT_VCE_MGCG))
+		return 0;
+
+	mutex_lock(&adev->grbm_idx_mutex);
+	for (i = 0; i < 2; i++) {
+		/* Program VCE Instance 0 or 1 if not harvested */
+		if (adev->vce.harvest_config & (1 << i))
+			continue;
+
+		if (i == 0)
+			WREG32_P(mmGRBM_GFX_INDEX, 0,
+					~GRBM_GFX_INDEX__VCE_INSTANCE_MASK);
+		else
+			WREG32_P(mmGRBM_GFX_INDEX,
+					GRBM_GFX_INDEX__VCE_INSTANCE_MASK,
+					~GRBM_GFX_INDEX__VCE_INSTANCE_MASK);
+
+		if (enable) {
+			/* initialize VCE_CLOCK_GATING_A: Clock ON/OFF delay */
+			uint32_t data = RREG32(mmVCE_CLOCK_GATING_A);
+			data &= ~(0xf | 0xff0);
+			data |= ((0x0 << 0) | (0x04 << 4));
+			WREG32(mmVCE_CLOCK_GATING_A, data);
+
+			/* initialize VCE_UENC_CLOCK_GATING: Clock ON/OFF delay */
+			data = RREG32(mmVCE_UENC_CLOCK_GATING);
+			data &= ~(0xf | 0xff0);
+			data |= ((0x0 << 0) | (0x04 << 4));
+			WREG32(mmVCE_UENC_CLOCK_GATING, data);
+		}
+
+		vce_v3_0_set_vce_sw_clock_gating(adev, enable);
+	}
+
+	WREG32_P(mmGRBM_GFX_INDEX, 0, ~GRBM_GFX_INDEX__VCE_INSTANCE_MASK);
+	mutex_unlock(&adev->grbm_idx_mutex);
+
 	return 0;
 }