drm/radeon/cik: add rlc helpers for DPM

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/cik.c

@@ -5587,6 +5587,35 @@ static u32 cik_halt_rlc(struct radeon_device *rdev)
 	return orig;
 }
 
+void cik_enter_rlc_safe_mode(struct radeon_device *rdev)
+{
+	u32 tmp, i, mask;
+
+	tmp = REQ | MESSAGE(MSG_ENTER_RLC_SAFE_MODE);
+	WREG32(RLC_GPR_REG2, tmp);
+
+	mask = GFX_POWER_STATUS | GFX_CLOCK_STATUS;
+	for (i = 0; i < rdev->usec_timeout; i++) {
+		if ((RREG32(RLC_GPM_STAT) & mask) == mask)
+			break;
+		udelay(1);
+	}
+
+	for (i = 0; i < rdev->usec_timeout; i++) {
+		if ((RREG32(RLC_GPR_REG2) & REQ) == 0)
+			break;
+		udelay(1);
+	}
+}
+
+void cik_exit_rlc_safe_mode(struct radeon_device *rdev)
+{
+	u32 tmp;
+
+	tmp = REQ | MESSAGE(MSG_EXIT_RLC_SAFE_MODE);
+	WREG32(RLC_GPR_REG2, tmp);
+}
+
 /**
  * cik_rlc_stop - stop the RLC ME
  *

drivers/gpu/drm/radeon/cikd.h

@@ -952,6 +952,8 @@
 
 #define RLC_GPM_STAT                                      0xC400
 #       define RLC_GPM_BUSY                               (1 << 0)
+#       define GFX_POWER_STATUS                           (1 << 1)
+#       define GFX_CLOCK_STATUS                           (1 << 2)
 
 #define RLC_PG_CNTL                                       0xC40C
 #       define GFX_PG_ENABLE                              (1 << 0)
@@ -1004,6 +1006,13 @@
 #define RLC_GPM_SCRATCH_ADDR                              0xC4B0
 #define RLC_GPM_SCRATCH_DATA                              0xC4B4
 
+#define RLC_GPR_REG2                                      0xC4E8
+#define		REQ      				0x00000001
+#define		MESSAGE(x)      			((x) << 1)
+#define		MESSAGE_MASK      			0x0000001e
+#define		MSG_ENTER_RLC_SAFE_MODE      			1
+#define		MSG_EXIT_RLC_SAFE_MODE      			0
+
 #define CP_HPD_EOP_BASE_ADDR                              0xC904
 #define CP_HPD_EOP_BASE_ADDR_HI                           0xC908
 #define CP_HPD_EOP_VMID                                   0xC90C