drm/amd/amdgpu: Add SW clock gating support to UVD 5 and 6

This patch adds support for software clock gating to UVD 5
and UVD 6 blocks with a preliminary commented out hardware
gating routine.

Currently hardware gating does not work so it's not activated.
Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/uvd_v5_0.c

@@ -31,6 +31,7 @@
 #include "uvd/uvd_5_0_sh_mask.h"
 #include "oss/oss_2_0_d.h"
 #include "oss/oss_2_0_sh_mask.h"
+#include "vi.h"
 
 static void uvd_v5_0_set_ring_funcs(struct amdgpu_device *adev);
 static void uvd_v5_0_set_irq_funcs(struct amdgpu_device *adev);
@@ -754,14 +755,128 @@ static int uvd_v5_0_process_interrupt(struct amdgpu_device *adev,
 	return 0;
 }
 
+static void uvd_v5_0_set_sw_clock_gating(struct amdgpu_device *adev)
+{
+	uint32_t data, data1, data2, suvd_flags;
+
+	data = RREG32(mmUVD_CGC_CTRL);
+	data1 = RREG32(mmUVD_SUVD_CGC_GATE);
+	data2 = RREG32(mmUVD_SUVD_CGC_CTRL);
+
+	data &= ~(UVD_CGC_CTRL__CLK_OFF_DELAY_MASK |
+		  UVD_CGC_CTRL__CLK_GATE_DLY_TIMER_MASK);
+
+	suvd_flags = UVD_SUVD_CGC_GATE__SRE_MASK |
+		     UVD_SUVD_CGC_GATE__SIT_MASK |
+		     UVD_SUVD_CGC_GATE__SMP_MASK |
+		     UVD_SUVD_CGC_GATE__SCM_MASK |
+		     UVD_SUVD_CGC_GATE__SDB_MASK;
+
+	data |= UVD_CGC_CTRL__DYN_CLOCK_MODE_MASK |
+		(1 << REG_FIELD_SHIFT(UVD_CGC_CTRL, CLK_GATE_DLY_TIMER)) |
+		(4 << REG_FIELD_SHIFT(UVD_CGC_CTRL, CLK_OFF_DELAY));
+
+	data &= ~(UVD_CGC_CTRL__UDEC_RE_MODE_MASK |
+			UVD_CGC_CTRL__UDEC_CM_MODE_MASK |
+			UVD_CGC_CTRL__UDEC_IT_MODE_MASK |
+			UVD_CGC_CTRL__UDEC_DB_MODE_MASK |
+			UVD_CGC_CTRL__UDEC_MP_MODE_MASK |
+			UVD_CGC_CTRL__SYS_MODE_MASK |
+			UVD_CGC_CTRL__UDEC_MODE_MASK |
+			UVD_CGC_CTRL__MPEG2_MODE_MASK |
+			UVD_CGC_CTRL__REGS_MODE_MASK |
+			UVD_CGC_CTRL__RBC_MODE_MASK |
+			UVD_CGC_CTRL__LMI_MC_MODE_MASK |
+			UVD_CGC_CTRL__LMI_UMC_MODE_MASK |
+			UVD_CGC_CTRL__IDCT_MODE_MASK |
+			UVD_CGC_CTRL__MPRD_MODE_MASK |
+			UVD_CGC_CTRL__MPC_MODE_MASK |
+			UVD_CGC_CTRL__LBSI_MODE_MASK |
+			UVD_CGC_CTRL__LRBBM_MODE_MASK |
+			UVD_CGC_CTRL__WCB_MODE_MASK |
+			UVD_CGC_CTRL__VCPU_MODE_MASK |
+			UVD_CGC_CTRL__JPEG_MODE_MASK |
+			UVD_CGC_CTRL__SCPU_MODE_MASK);
+	data2 &= ~(UVD_SUVD_CGC_CTRL__SRE_MODE_MASK |
+			UVD_SUVD_CGC_CTRL__SIT_MODE_MASK |
+			UVD_SUVD_CGC_CTRL__SMP_MODE_MASK |
+			UVD_SUVD_CGC_CTRL__SCM_MODE_MASK |
+			UVD_SUVD_CGC_CTRL__SDB_MODE_MASK);
+	data1 |= suvd_flags;
+
+	WREG32(mmUVD_CGC_CTRL, data);
+	WREG32(mmUVD_CGC_GATE, 0);
+	WREG32(mmUVD_SUVD_CGC_GATE, data1);
+	WREG32(mmUVD_SUVD_CGC_CTRL, data2);
+}
+
+#if 0
+static void uvd_v5_0_set_hw_clock_gating(struct amdgpu_device *adev)
+{
+	uint32_t data, data1, cgc_flags, suvd_flags;
+
+	data = RREG32(mmUVD_CGC_GATE);
+	data1 = RREG32(mmUVD_SUVD_CGC_GATE);
+
+	cgc_flags = UVD_CGC_GATE__SYS_MASK |
+				UVD_CGC_GATE__UDEC_MASK |
+				UVD_CGC_GATE__MPEG2_MASK |
+				UVD_CGC_GATE__RBC_MASK |
+				UVD_CGC_GATE__LMI_MC_MASK |
+				UVD_CGC_GATE__IDCT_MASK |
+				UVD_CGC_GATE__MPRD_MASK |
+				UVD_CGC_GATE__MPC_MASK |
+				UVD_CGC_GATE__LBSI_MASK |
+				UVD_CGC_GATE__LRBBM_MASK |
+				UVD_CGC_GATE__UDEC_RE_MASK |
+				UVD_CGC_GATE__UDEC_CM_MASK |
+				UVD_CGC_GATE__UDEC_IT_MASK |
+				UVD_CGC_GATE__UDEC_DB_MASK |
+				UVD_CGC_GATE__UDEC_MP_MASK |
+				UVD_CGC_GATE__WCB_MASK |
+				UVD_CGC_GATE__VCPU_MASK |
+				UVD_CGC_GATE__SCPU_MASK;
+
+	suvd_flags = UVD_SUVD_CGC_GATE__SRE_MASK |
+				UVD_SUVD_CGC_GATE__SIT_MASK |
+				UVD_SUVD_CGC_GATE__SMP_MASK |
+				UVD_SUVD_CGC_GATE__SCM_MASK |
+				UVD_SUVD_CGC_GATE__SDB_MASK;
+
+	data |= cgc_flags;
+	data1 |= suvd_flags;
+
+	WREG32(mmUVD_CGC_GATE, data);
+	WREG32(mmUVD_SUVD_CGC_GATE, data1);
+}
+#endif
+
 static int uvd_v5_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;
+	static int curstate = -1;
 
 	if (!(adev->cg_flags & AMD_CG_SUPPORT_UVD_MGCG))
 		return 0;
 
+	if (curstate == state)
+		return 0;
+
+	curstate = state;
+	if (enable) {
+		/* disable HW gating and enable Sw gating */
+		uvd_v5_0_set_sw_clock_gating(adev);
+	} else {
+		/* wait for STATUS to clear */
+		if (uvd_v5_0_wait_for_idle(handle))
+			return -EBUSY;
+
+		/* enable HW gates because UVD is idle */
+/*		uvd_v5_0_set_hw_clock_gating(adev); */
+	}
+
 	return 0;
 }