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/*
* 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;
}
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