+ WREG32(CP_RB_CNTL, tmp);
+ WREG32(CP_SEM_WAIT_TIMER, 0x4);
+
+ /* Set the write pointer delay */
+ WREG32(CP_RB_WPTR_DELAY, 0);
+
+ /* Initialize the ring buffer's read and write pointers */
+ WREG32(CP_RB_CNTL, tmp | RB_RPTR_WR_ENA);
+ WREG32(CP_RB_RPTR_WR, 0);
+ WREG32(CP_RB_WPTR, 0);
+ WREG32(CP_RB_RPTR_ADDR, rdev->cp.gpu_addr & 0xFFFFFFFF);
+ WREG32(CP_RB_RPTR_ADDR_HI, upper_32_bits(rdev->cp.gpu_addr));
+ mdelay(1);
+ WREG32(CP_RB_CNTL, tmp);
+
+ WREG32(CP_RB_BASE, rdev->cp.gpu_addr >> 8);
+ WREG32(CP_DEBUG, (1 << 27) | (1 << 28));
+
+ rdev->cp.rptr = RREG32(CP_RB_RPTR);
+ rdev->cp.wptr = RREG32(CP_RB_WPTR);
+
+ r600_cp_start(rdev);
+ rdev->cp.ready = true;
+ r = radeon_ring_test(rdev);
+ if (r) {
+ rdev->cp.ready = false;
+ return r;
+ }
+ return 0;
+}