2019-05-29 14:18:02 +00:00
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// SPDX-License-Identifier: GPL-2.0-only
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2014-01-04 19:58:35 +00:00
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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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* 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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