1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (c) 2014, Patrik Jakobsson 4*4882a593Smuzhiyun * All Rights Reserved. 5*4882a593Smuzhiyun * 6*4882a593Smuzhiyun * Authors: Patrik Jakobsson <patrik.r.jakobsson@gmail.com> 7*4882a593Smuzhiyun */ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #include "psb_drv.h" 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun #include "blitter.h" 12*4882a593Smuzhiyun #include "psb_reg.h" 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun /* Wait for the blitter to be completely idle */ gma_blt_wait_idle(struct drm_psb_private * dev_priv)15*4882a593Smuzhiyunint gma_blt_wait_idle(struct drm_psb_private *dev_priv) 16*4882a593Smuzhiyun { 17*4882a593Smuzhiyun unsigned long stop = jiffies + HZ; 18*4882a593Smuzhiyun int busy = 1; 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun /* NOP for Cedarview */ 21*4882a593Smuzhiyun if (IS_CDV(dev_priv->dev)) 22*4882a593Smuzhiyun return 0; 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun /* First do a quick check */ 25*4882a593Smuzhiyun if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) && 26*4882a593Smuzhiyun ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0)) 27*4882a593Smuzhiyun return 0; 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun do { 30*4882a593Smuzhiyun busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY); 31*4882a593Smuzhiyun } while (busy && !time_after_eq(jiffies, stop)); 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun if (busy) 34*4882a593Smuzhiyun return -EBUSY; 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun do { 37*4882a593Smuzhiyun busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & 38*4882a593Smuzhiyun _PSB_C2B_STATUS_BUSY) != 0); 39*4882a593Smuzhiyun } while (busy && !time_after_eq(jiffies, stop)); 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun /* If still busy, we probably have a hang */ 42*4882a593Smuzhiyun return (busy) ? -EBUSY : 0; 43*4882a593Smuzhiyun } 44