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