| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * Copyright (c) 2014, Patrik Jakobsson |
| 4 | * All Rights Reserved. |
| 5 | * |
| 6 | * Authors: Patrik Jakobsson <patrik.r.jakobsson@gmail.com> |
| 7 | */ |
| 8 | |
| 9 | #include "psb_drv.h" |
| 10 | |
| 11 | #include "blitter.h" |
| 12 | #include "psb_reg.h" |
| 13 | |
| 14 | /* Wait for the blitter to be completely idle */ |
| 15 | int gma_blt_wait_idle(struct drm_psb_private *dev_priv) |
| 16 | { |
| 17 | unsigned long stop = jiffies + HZ; |
| 18 | int busy = 1; |
| 19 | |
| 20 | /* NOP for Cedarview */ |
| 21 | if (IS_CDV(dev_priv->dev)) |
| 22 | return 0; |
| 23 | |
| 24 | /* First do a quick check */ |
| 25 | if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) && |
| 26 | ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0)) |
| 27 | return 0; |
| 28 | |
| 29 | do { |
| 30 | busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY); |
| 31 | } while (busy && !time_after_eq(jiffies, stop)); |
| 32 | |
| 33 | if (busy) |
| 34 | return -EBUSY; |
| 35 | |
| 36 | do { |
| 37 | busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & |
| 38 | _PSB_C2B_STATUS_BUSY) != 0); |
| 39 | } while (busy && !time_after_eq(jiffies, stop)); |
| 40 | |
| 41 | /* If still busy, we probably have a hang */ |
| 42 | return (busy) ? -EBUSY : 0; |
| 43 | } |