333 lines
8.9 KiB
C
333 lines
8.9 KiB
C
/**************************************************************************
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* Copyright (c) 2009-2011, Intel Corporation.
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* All Rights Reserved.
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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 (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* 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 FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Authors:
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* Benjamin Defnet <benjamin.r.defnet@intel.com>
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* Rajesh Poornachandran <rajesh.poornachandran@intel.com>
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* Massively reworked
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* Alan Cox <alan@linux.intel.com>
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*/
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#include "power.h"
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#include "psb_drv.h"
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#include "psb_reg.h"
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#include "psb_intel_reg.h"
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#include <linux/mutex.h>
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#include <linux/pm_runtime.h>
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static struct mutex power_mutex; /* Serialize power ops */
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static spinlock_t power_ctrl_lock; /* Serialize power claim */
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/**
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* gma_power_init - initialise power manager
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* @dev: our device
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*
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* Set up for power management tracking of our hardware.
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*/
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void gma_power_init(struct drm_device *dev)
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{
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struct drm_psb_private *dev_priv = dev->dev_private;
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/* FIXME: Move APM/OSPM base into relevant device code */
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dev_priv->apm_base = dev_priv->apm_reg & 0xffff;
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dev_priv->ospm_base &= 0xffff;
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dev_priv->display_power = true; /* We start active */
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dev_priv->display_count = 0; /* Currently no users */
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dev_priv->suspended = false; /* And not suspended */
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spin_lock_init(&power_ctrl_lock);
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mutex_init(&power_mutex);
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if (dev_priv->ops->init_pm)
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dev_priv->ops->init_pm(dev);
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}
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/**
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* gma_power_uninit - end power manager
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* @dev: device to end for
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*
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* Undo the effects of gma_power_init
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*/
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void gma_power_uninit(struct drm_device *dev)
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{
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pm_runtime_disable(&dev->pdev->dev);
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pm_runtime_set_suspended(&dev->pdev->dev);
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}
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/**
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* gma_suspend_display - suspend the display logic
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* @dev: our DRM device
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*
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* Suspend the display logic of the graphics interface
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*/
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static void gma_suspend_display(struct drm_device *dev)
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{
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struct drm_psb_private *dev_priv = dev->dev_private;
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if (dev_priv->suspended)
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return;
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dev_priv->ops->save_regs(dev);
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dev_priv->ops->power_down(dev);
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dev_priv->display_power = false;
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}
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/**
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* gma_resume_display - resume display side logic
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*
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* Resume the display hardware restoring state and enabling
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* as necessary.
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*/
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static void gma_resume_display(struct pci_dev *pdev)
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{
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struct drm_device *dev = pci_get_drvdata(pdev);
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struct drm_psb_private *dev_priv = dev->dev_private;
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/* turn on the display power island */
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dev_priv->ops->power_up(dev);
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dev_priv->suspended = false;
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dev_priv->display_power = true;
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PSB_WVDC32(dev_priv->pge_ctl | _PSB_PGETBL_ENABLED, PSB_PGETBL_CTL);
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pci_write_config_word(pdev, PSB_GMCH_CTRL,
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dev_priv->gmch_ctrl | _PSB_GMCH_ENABLED);
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psb_gtt_restore(dev); /* Rebuild our GTT mappings */
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dev_priv->ops->restore_regs(dev);
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}
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/**
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* gma_suspend_pci - suspend PCI side
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* @pdev: PCI device
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*
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* Perform the suspend processing on our PCI device state
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*/
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static void gma_suspend_pci(struct pci_dev *pdev)
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{
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struct drm_device *dev = pci_get_drvdata(pdev);
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struct drm_psb_private *dev_priv = dev->dev_private;
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int bsm, vbt;
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if (dev_priv->suspended)
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return;
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pci_save_state(pdev);
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pci_read_config_dword(pdev, 0x5C, &bsm);
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dev_priv->regs.saveBSM = bsm;
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pci_read_config_dword(pdev, 0xFC, &vbt);
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dev_priv->regs.saveVBT = vbt;
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pci_read_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, &dev_priv->msi_addr);
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pci_read_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, &dev_priv->msi_data);
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pci_disable_device(pdev);
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pci_set_power_state(pdev, PCI_D3hot);
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dev_priv->suspended = true;
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}
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/**
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* gma_resume_pci - resume helper
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* @dev: our PCI device
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*
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* Perform the resume processing on our PCI device state - rewrite
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* register state and re-enable the PCI device
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*/
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static bool gma_resume_pci(struct pci_dev *pdev)
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{
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struct drm_device *dev = pci_get_drvdata(pdev);
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struct drm_psb_private *dev_priv = dev->dev_private;
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int ret;
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if (!dev_priv->suspended)
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return true;
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pci_set_power_state(pdev, PCI_D0);
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pci_restore_state(pdev);
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pci_write_config_dword(pdev, 0x5c, dev_priv->regs.saveBSM);
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pci_write_config_dword(pdev, 0xFC, dev_priv->regs.saveVBT);
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/* restoring MSI address and data in PCIx space */
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pci_write_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, dev_priv->msi_addr);
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pci_write_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, dev_priv->msi_data);
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ret = pci_enable_device(pdev);
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if (ret != 0)
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dev_err(&pdev->dev, "pci_enable failed: %d\n", ret);
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else
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dev_priv->suspended = false;
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return !dev_priv->suspended;
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}
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/**
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* gma_power_suspend - bus callback for suspend
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* @pdev: our PCI device
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* @state: suspend type
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*
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* Called back by the PCI layer during a suspend of the system. We
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* perform the necessary shut down steps and save enough state that
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* we can undo this when resume is called.
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*/
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int gma_power_suspend(struct device *_dev)
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{
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struct pci_dev *pdev = to_pci_dev(_dev);
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struct drm_device *dev = pci_get_drvdata(pdev);
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struct drm_psb_private *dev_priv = dev->dev_private;
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mutex_lock(&power_mutex);
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if (!dev_priv->suspended) {
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if (dev_priv->display_count) {
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mutex_unlock(&power_mutex);
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dev_err(dev->dev, "GPU hardware busy, cannot suspend\n");
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return -EBUSY;
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}
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psb_irq_uninstall(dev);
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gma_suspend_display(dev);
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gma_suspend_pci(pdev);
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}
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mutex_unlock(&power_mutex);
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return 0;
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}
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/**
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* gma_power_resume - resume power
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* @pdev: PCI device
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*
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* Resume the PCI side of the graphics and then the displays
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*/
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int gma_power_resume(struct device *_dev)
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{
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struct pci_dev *pdev = to_pci_dev(_dev);
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struct drm_device *dev = pci_get_drvdata(pdev);
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mutex_lock(&power_mutex);
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gma_resume_pci(pdev);
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gma_resume_display(pdev);
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psb_irq_preinstall(dev);
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psb_irq_postinstall(dev);
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mutex_unlock(&power_mutex);
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return 0;
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}
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/**
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* gma_power_is_on - returne true if power is on
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* @dev: our DRM device
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*
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* Returns true if the display island power is on at this moment
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*/
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bool gma_power_is_on(struct drm_device *dev)
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{
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struct drm_psb_private *dev_priv = dev->dev_private;
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return dev_priv->display_power;
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}
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/**
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* gma_power_begin - begin requiring power
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* @dev: our DRM device
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* @force_on: true to force power on
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*
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* Begin an action that requires the display power island is enabled.
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* We refcount the islands.
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*/
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bool gma_power_begin(struct drm_device *dev, bool force_on)
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{
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struct drm_psb_private *dev_priv = dev->dev_private;
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int ret;
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unsigned long flags;
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spin_lock_irqsave(&power_ctrl_lock, flags);
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/* Power already on ? */
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if (dev_priv->display_power) {
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dev_priv->display_count++;
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pm_runtime_get(&dev->pdev->dev);
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spin_unlock_irqrestore(&power_ctrl_lock, flags);
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return true;
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}
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if (force_on == false)
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goto out_false;
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/* Ok power up needed */
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ret = gma_resume_pci(dev->pdev);
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if (ret == 0) {
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psb_irq_preinstall(dev);
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psb_irq_postinstall(dev);
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pm_runtime_get(&dev->pdev->dev);
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dev_priv->display_count++;
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spin_unlock_irqrestore(&power_ctrl_lock, flags);
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return true;
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}
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out_false:
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spin_unlock_irqrestore(&power_ctrl_lock, flags);
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return false;
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}
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/**
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* gma_power_end - end use of power
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* @dev: Our DRM device
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*
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* Indicate that one of our gma_power_begin() requested periods when
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* the diplay island power is needed has completed.
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*/
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void gma_power_end(struct drm_device *dev)
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{
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struct drm_psb_private *dev_priv = dev->dev_private;
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unsigned long flags;
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spin_lock_irqsave(&power_ctrl_lock, flags);
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dev_priv->display_count--;
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WARN_ON(dev_priv->display_count < 0);
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spin_unlock_irqrestore(&power_ctrl_lock, flags);
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pm_runtime_put(&dev->pdev->dev);
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}
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int psb_runtime_suspend(struct device *dev)
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{
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return gma_power_suspend(dev);
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}
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int psb_runtime_resume(struct device *dev)
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{
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return gma_power_resume(dev);
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}
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int psb_runtime_idle(struct device *dev)
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{
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struct drm_device *drmdev = pci_get_drvdata(to_pci_dev(dev));
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struct drm_psb_private *dev_priv = drmdev->dev_private;
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if (dev_priv->display_count)
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return 0;
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else
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return 1;
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}
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int gma_power_thaw(struct device *_dev)
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{
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return gma_power_resume(_dev);
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}
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int gma_power_freeze(struct device *_dev)
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{
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return gma_power_suspend(_dev);
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}
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int gma_power_restore(struct device *_dev)
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{
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return gma_power_resume(_dev);
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}
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