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https://github.com/NVIDIA/open-gpu-kernel-modules.git
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131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
/*
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* SPDX-FileCopyrightText: Copyright (c) 2020-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#define __NO_VERSION__
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#include "os-interface.h"
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#include "nv-linux.h"
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/*!
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* @brief Unpowergate the display.
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*
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* Increment the device's usage counter, run pm_request_resume(dev)
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* and return its result.
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*
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* For more details on runtime pm functions, please check the below
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* files in the Linux kernel:
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*
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* include/linux/pm_runtime.h
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* include/linux/pm.h
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* or
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* https://www.kernel.org/doc/Documentation/power/runtime_pm.txt
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*
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* pm_request_resume() submits a request to execute the subsystem-level
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* resume callback for the device (the request is represented by a work
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* item in pm_wq); returns 0 on success, 1 if the device's runtime PM
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* status was already 'active', or error code if the request hasn't
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* been queued up.
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*
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* @param[in] nv Per gpu linux state
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*
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* @returns NV_STATUS
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*/
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NV_STATUS NV_API_CALL nv_soc_pm_unpowergate(
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nv_state_t *nv)
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{
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#if NV_SUPPORTS_PLATFORM_DISPLAY_DEVICE
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nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
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NvS32 ret = -EBUSY;
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ret = pm_runtime_get(nvl->dev);
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if (ret == 1)
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{
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nv_printf(NV_DBG_INFO, "NVRM: device was already unpowergated\n");
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}
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else if (ret == -EINPROGRESS)
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{
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/*
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* pm_runtime_get() internally calls __pm_runtime_resume(...RPM_ASYNC)
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* which internally calls rpm_resume() and this function will throw
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* "-EINPROGRESS" if it is being called when device state is
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* RPM_RESUMING and RPM_ASYNC or RPM_NOWAIT is set.
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*/
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nv_printf(NV_DBG_INFO, "NVRM: device is already unpowergating\n");
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}
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else if (ret < 0)
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{
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nv_printf(NV_DBG_ERRORS, "NVRM: unpowergate unsuccessful. ret: %d\n", ret);
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return NV_ERR_GENERIC;
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}
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return NV_OK;
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#else
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return NV_ERR_NOT_SUPPORTED;
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#endif
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}
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/*!
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* @brief Powergate the display.
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*
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* Decrement the device's usage counter; if the result is 0 then run
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* pm_request_idle(dev) and return its result.
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*
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* For more details on runtime pm functions, please check the below
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* files in the Linux kernel:
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*
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* include/linux/pm_runtime.h
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* include/linux/pm.h
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* or
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* https://www.kernel.org/doc/Documentation/power/runtime_pm.txt
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*
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* @param[in] nv Per gpu linux state
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*
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* @returns NV_STATUS
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*/
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NV_STATUS NV_API_CALL nv_soc_pm_powergate(
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nv_state_t *nv)
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{
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#if NV_SUPPORTS_PLATFORM_DISPLAY_DEVICE
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NV_STATUS status = NV_ERR_GENERIC;
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nv_linux_state_t *nvl = NV_GET_NVL_FROM_NV_STATE(nv);
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NvS32 ret = -EBUSY;
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ret = pm_runtime_put(nvl->dev);
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if (ret == 0)
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{
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status = NV_OK;
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}
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else
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{
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nv_printf(NV_DBG_ERRORS, "NVRM: powergate unsuccessful. ret: %d\n", ret);
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}
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return status;
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#else
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return NV_ERR_NOT_SUPPORTED;
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#endif
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}
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