tjh.dev
Linux kernel mirror (for testing)
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linux
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
14int 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
31int 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
48int 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
65void 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
75void 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
87void 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}