| /* | |
| * Copyright (c) 2014, Patrik Jakobsson | |
| * All Rights Reserved. | |
| * | |
| * This program is free software; you can redistribute it and/or modify it | |
| * under the terms and conditions of the GNU General Public License, | |
| * version 2, as published by the Free Software Foundation. | |
| * | |
| * This program is distributed in the hope it will be useful, but WITHOUT | |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| * more details. | |
| * | |
| * Authors: Patrik Jakobsson <patrik.r.jakobsson@gmail.com> | |
| */ | |
| #include "psb_drv.h" | |
| #include "blitter.h" | |
| #include "psb_reg.h" | |
| /* Wait for the blitter to be completely idle */ | |
| int gma_blt_wait_idle(struct drm_psb_private *dev_priv) | |
| { | |
| unsigned long stop = jiffies + HZ; | |
| int busy = 1; | |
| /* NOP for Cedarview */ | |
| if (IS_CDV(dev_priv->dev)) | |
| return 0; | |
| /* First do a quick check */ | |
| if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) && | |
| ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0)) | |
| return 0; | |
| do { | |
| busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY); | |
| } while (busy && !time_after_eq(jiffies, stop)); | |
| if (busy) | |
| return -EBUSY; | |
| do { | |
| busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & | |
| _PSB_C2B_STATUS_BUSY) != 0); | |
| } while (busy && !time_after_eq(jiffies, stop)); | |
| /* If still busy, we probably have a hang */ | |
| return (busy) ? -EBUSY : 0; | |
| } |