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2025cf9e19
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 263 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.208660670@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
43 lines
1,004 B
C
43 lines
1,004 B
C
// SPDX-License-Identifier: GPL-2.0-only
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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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