| Patrik Jakobsson | 1c6b5d1 | 2014-01-04 20:58:35 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2014, Patrik Jakobsson |
| 3 | * All Rights Reserved. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms and conditions of the GNU General Public License, |
| 7 | * version 2, as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * Authors: Patrik Jakobsson <patrik.r.jakobsson@gmail.com> |
| 15 | */ |
| 16 | |
| 17 | #include "psb_drv.h" |
| 18 | |
| 19 | #include "blitter.h" |
| 20 | #include "psb_reg.h" |
| 21 | |
| 22 | /* Wait for the blitter to be completely idle */ |
| 23 | int gma_blt_wait_idle(struct drm_psb_private *dev_priv) |
| 24 | { |
| 25 | unsigned long stop = jiffies + HZ; |
| 26 | int busy = 1; |
| 27 | |
| 28 | /* NOP for Cedarview */ |
| 29 | if (IS_CDV(dev_priv->dev)) |
| 30 | return 0; |
| 31 | |
| 32 | /* First do a quick check */ |
| 33 | if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) && |
| 34 | ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0)) |
| 35 | return 0; |
| 36 | |
| 37 | do { |
| 38 | busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY); |
| 39 | } while (busy && !time_after_eq(jiffies, stop)); |
| 40 | |
| 41 | if (busy) |
| 42 | return -EBUSY; |
| 43 | |
| 44 | do { |
| 45 | busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & |
| 46 | _PSB_C2B_STATUS_BUSY) != 0); |
| 47 | } while (busy && !time_after_eq(jiffies, stop)); |
| 48 | |
| 49 | /* If still busy, we probably have a hang */ |
| 50 | return (busy) ? -EBUSY : 0; |
| 51 | } |