| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | /* |
| 3 | * Copyright (C) 2025, Advanced Micro Devices, Inc. |
| 4 | */ |
| 5 | |
| 6 | #include <drm/amdxdna_accel.h> |
| 7 | #include <drm/drm_drv.h> |
| 8 | #include <linux/pm_runtime.h> |
| 9 | |
| 10 | #include "amdxdna_pm.h" |
| 11 | |
| 12 | #define AMDXDNA_AUTOSUSPEND_DELAY 5000 /* milliseconds */ |
| 13 | |
| 14 | int amdxdna_pm_suspend(struct device *dev) |
| 15 | { |
| 16 | struct amdxdna_dev *xdna = to_xdna_dev(dev_get_drvdata(dev)); |
| 17 | int ret = -EOPNOTSUPP; |
| 18 | bool rpm; |
| 19 | |
| 20 | if (xdna->dev_info->ops->suspend) { |
| 21 | rpm = xdna->rpm_on; |
| 22 | xdna->rpm_on = false; |
| 23 | ret = xdna->dev_info->ops->suspend(xdna); |
| 24 | xdna->rpm_on = rpm; |
| 25 | } |
| 26 | |
| 27 | XDNA_DBG(xdna, "Suspend done ret %d", ret); |
| 28 | return ret; |
| 29 | } |
| 30 | |
| 31 | int amdxdna_pm_resume(struct device *dev) |
| 32 | { |
| 33 | struct amdxdna_dev *xdna = to_xdna_dev(dev_get_drvdata(dev)); |
| 34 | int ret = -EOPNOTSUPP; |
| 35 | bool rpm; |
| 36 | |
| 37 | if (xdna->dev_info->ops->resume) { |
| 38 | rpm = xdna->rpm_on; |
| 39 | xdna->rpm_on = false; |
| 40 | ret = xdna->dev_info->ops->resume(xdna); |
| 41 | xdna->rpm_on = rpm; |
| 42 | } |
| 43 | |
| 44 | XDNA_DBG(xdna, "Resume done ret %d", ret); |
| 45 | return ret; |
| 46 | } |
| 47 | |
| 48 | int amdxdna_pm_resume_get(struct amdxdna_dev *xdna) |
| 49 | { |
| 50 | struct device *dev = xdna->ddev.dev; |
| 51 | int ret; |
| 52 | |
| 53 | if (!xdna->rpm_on) |
| 54 | return 0; |
| 55 | |
| 56 | ret = pm_runtime_resume_and_get(dev); |
| 57 | if (ret) { |
| 58 | XDNA_ERR(xdna, "Resume failed: %d", ret); |
| 59 | pm_runtime_set_suspended(dev); |
| 60 | } |
| 61 | |
| 62 | return ret; |
| 63 | } |
| 64 | |
| 65 | void amdxdna_pm_suspend_put(struct amdxdna_dev *xdna) |
| 66 | { |
| 67 | struct device *dev = xdna->ddev.dev; |
| 68 | |
| 69 | if (!xdna->rpm_on) |
| 70 | return; |
| 71 | |
| 72 | pm_runtime_put_autosuspend(dev); |
| 73 | } |
| 74 | |
| 75 | void amdxdna_pm_init(struct amdxdna_dev *xdna) |
| 76 | { |
| 77 | struct device *dev = xdna->ddev.dev; |
| 78 | |
| 79 | pm_runtime_set_active(dev); |
| 80 | pm_runtime_set_autosuspend_delay(dev, AMDXDNA_AUTOSUSPEND_DELAY); |
| 81 | pm_runtime_use_autosuspend(dev); |
| 82 | pm_runtime_allow(dev); |
| 83 | pm_runtime_put_autosuspend(dev); |
| 84 | xdna->rpm_on = true; |
| 85 | } |
| 86 | |
| 87 | void amdxdna_pm_fini(struct amdxdna_dev *xdna) |
| 88 | { |
| 89 | struct device *dev = xdna->ddev.dev; |
| 90 | |
| 91 | xdna->rpm_on = false; |
| 92 | pm_runtime_get_noresume(dev); |
| 93 | pm_runtime_forbid(dev); |
| 94 | } |
| 95 |