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https://github.com/edk2-porting/linux-next.git
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52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
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/*
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* Copyright (c) 2014, Patrik Jakobsson
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* Authors: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
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*/
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#include "psb_drv.h"
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#include "blitter.h"
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#include "psb_reg.h"
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/* Wait for the blitter to be completely idle */
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int gma_blt_wait_idle(struct drm_psb_private *dev_priv)
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{
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unsigned long stop = jiffies + HZ;
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int busy = 1;
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/* NOP for Cedarview */
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if (IS_CDV(dev_priv->dev))
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return 0;
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/* First do a quick check */
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if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) &&
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((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0))
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return 0;
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do {
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busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
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} while (busy && !time_after_eq(jiffies, stop));
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if (busy)
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return -EBUSY;
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do {
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busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
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_PSB_C2B_STATUS_BUSY) != 0);
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} while (busy && !time_after_eq(jiffies, stop));
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/* If still busy, we probably have a hang */
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return (busy) ? -EBUSY : 0;
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}
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