1 /* 2 * Copyright (c) 2014, Patrik Jakobsson 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * Authors: Patrik Jakobsson <patrik.r.jakobsson@gmail.com> 15 */ 16 17 #include "psb_drv.h" 18 19 #include "blitter.h" 20 #include "psb_reg.h" 21 22 /* Wait for the blitter to be completely idle */ gma_blt_wait_idle(struct drm_psb_private * dev_priv)23int gma_blt_wait_idle(struct drm_psb_private *dev_priv) 24 { 25 unsigned long stop = jiffies + HZ; 26 int busy = 1; 27 28 /* NOP for Cedarview */ 29 if (IS_CDV(dev_priv->dev)) 30 return 0; 31 32 /* First do a quick check */ 33 if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) && 34 ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0)) 35 return 0; 36 37 do { 38 busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY); 39 } while (busy && !time_after_eq(jiffies, stop)); 40 41 if (busy) 42 return -EBUSY; 43 44 do { 45 busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & 46 _PSB_C2B_STATUS_BUSY) != 0); 47 } while (busy && !time_after_eq(jiffies, stop)); 48 49 /* If still busy, we probably have a hang */ 50 return (busy) ? -EBUSY : 0; 51 } 52