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Currently, pm_runtime_resume_and_get() is invoked in the driver's open callback, and pm_runtime_put_autosuspend() is called in the close callback. As a result, the device remains active whenever an application opens it, even if no I/O is performed, leading to unnecessary power consumption. Move the runtime PM calls to the AIE2 callbacks that actually interact with the hardware. The device will automatically suspend after 5 seconds of inactivity (no hardware accesses and no pending commands), and it will be resumed on the next hardware access. Reviewed-by: Karol Wachowski <karol.wachowski@linux.intel.com> Signed-off-by: Lizhi Hou <lizhi.hou@amd.com> Link: https://lore.kernel.org/r/20250923152229.1303625-1-lizhi.hou@amd.com
95 lines
1.9 KiB
C
95 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2025, Advanced Micro Devices, Inc.
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*/
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#include <drm/amdxdna_accel.h>
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#include <drm/drm_drv.h>
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#include <linux/pm_runtime.h>
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#include "amdxdna_pm.h"
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#define AMDXDNA_AUTOSUSPEND_DELAY 5000 /* milliseconds */
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int amdxdna_pm_suspend(struct device *dev)
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{
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struct amdxdna_dev *xdna = to_xdna_dev(dev_get_drvdata(dev));
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int ret = -EOPNOTSUPP;
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bool rpm;
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if (xdna->dev_info->ops->suspend) {
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rpm = xdna->rpm_on;
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xdna->rpm_on = false;
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ret = xdna->dev_info->ops->suspend(xdna);
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xdna->rpm_on = rpm;
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}
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XDNA_DBG(xdna, "Suspend done ret %d", ret);
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return ret;
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}
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int amdxdna_pm_resume(struct device *dev)
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{
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struct amdxdna_dev *xdna = to_xdna_dev(dev_get_drvdata(dev));
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int ret = -EOPNOTSUPP;
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bool rpm;
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if (xdna->dev_info->ops->resume) {
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rpm = xdna->rpm_on;
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xdna->rpm_on = false;
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ret = xdna->dev_info->ops->resume(xdna);
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xdna->rpm_on = rpm;
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}
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XDNA_DBG(xdna, "Resume done ret %d", ret);
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return ret;
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}
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int amdxdna_pm_resume_get(struct amdxdna_dev *xdna)
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{
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struct device *dev = xdna->ddev.dev;
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int ret;
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if (!xdna->rpm_on)
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return 0;
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ret = pm_runtime_resume_and_get(dev);
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if (ret) {
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XDNA_ERR(xdna, "Resume failed: %d", ret);
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pm_runtime_set_suspended(dev);
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}
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return ret;
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}
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void amdxdna_pm_suspend_put(struct amdxdna_dev *xdna)
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{
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struct device *dev = xdna->ddev.dev;
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if (!xdna->rpm_on)
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return;
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pm_runtime_put_autosuspend(dev);
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}
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void amdxdna_pm_init(struct amdxdna_dev *xdna)
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{
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struct device *dev = xdna->ddev.dev;
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pm_runtime_set_active(dev);
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pm_runtime_set_autosuspend_delay(dev, AMDXDNA_AUTOSUSPEND_DELAY);
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pm_runtime_use_autosuspend(dev);
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pm_runtime_allow(dev);
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pm_runtime_put_autosuspend(dev);
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xdna->rpm_on = true;
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}
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void amdxdna_pm_fini(struct amdxdna_dev *xdna)
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{
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struct device *dev = xdna->ddev.dev;
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xdna->rpm_on = false;
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pm_runtime_get_noresume(dev);
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pm_runtime_forbid(dev);
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}
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