mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 12:36:45 +07:00
1c6b5d17d6
Right now, all we need to know about the blitter is that it's not doing anything that can be messed up when fiddling with MMU mappings. Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
/*
|
|
* 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;
|
|
}
|