// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2014, Patrik Jakobsson * All Rights Reserved. * * 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; }