| /************************************************************************** |
| * Copyright (c) 2009-2011, Intel Corporation. |
| * All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| * |
| * Authors: |
| * Benjamin Defnet <benjamin.r.defnet@intel.com> |
| * Rajesh Poornachandran <rajesh.poornachandran@intel.com> |
| * Massively reworked |
| * Alan Cox <alan@linux.intel.com> |
| */ |
| |
| #include "power.h" |
| #include "psb_drv.h" |
| #include "psb_reg.h" |
| #include "psb_intel_reg.h" |
| #include "psb_irq.h" |
| #include <linux/mutex.h> |
| #include <linux/pm_runtime.h> |
| |
| static struct mutex power_mutex; /* Serialize power ops */ |
| static DEFINE_SPINLOCK(power_ctrl_lock); /* Serialize power claim */ |
| |
| /** |
| * gma_power_init - initialise power manager |
| * @dev: our device |
| * |
| * Set up for power management tracking of our hardware. |
| */ |
| void gma_power_init(struct drm_device *dev) |
| { |
| struct drm_psb_private *dev_priv = dev->dev_private; |
| |
| /* FIXME: Move APM/OSPM base into relevant device code */ |
| dev_priv->apm_base = dev_priv->apm_reg & 0xffff; |
| dev_priv->ospm_base &= 0xffff; |
| |
| dev_priv->display_power = true; /* We start active */ |
| dev_priv->display_count = 0; /* Currently no users */ |
| dev_priv->suspended = false; /* And not suspended */ |
| mutex_init(&power_mutex); |
| |
| if (dev_priv->ops->init_pm) |
| dev_priv->ops->init_pm(dev); |
| } |
| |
| /** |
| * gma_power_uninit - end power manager |
| * @dev: device to end for |
| * |
| * Undo the effects of gma_power_init |
| */ |
| void gma_power_uninit(struct drm_device *dev) |
| { |
| pm_runtime_disable(dev->dev); |
| pm_runtime_set_suspended(dev->dev); |
| } |
| |
| /** |
| * gma_suspend_display - suspend the display logic |
| * @dev: our DRM device |
| * |
| * Suspend the display logic of the graphics interface |
| */ |
| static void gma_suspend_display(struct drm_device *dev) |
| { |
| struct drm_psb_private *dev_priv = dev->dev_private; |
| |
| if (dev_priv->suspended) |
| return; |
| dev_priv->ops->save_regs(dev); |
| dev_priv->ops->power_down(dev); |
| dev_priv->display_power = false; |
| } |
| |
| /** |
| * gma_resume_display - resume display side logic |
| * @pdev: PCI device |
| * |
| * Resume the display hardware restoring state and enabling |
| * as necessary. |
| */ |
| static void gma_resume_display(struct pci_dev *pdev) |
| { |
| struct drm_device *dev = pci_get_drvdata(pdev); |
| struct drm_psb_private *dev_priv = dev->dev_private; |
| |
| /* turn on the display power island */ |
| dev_priv->ops->power_up(dev); |
| dev_priv->suspended = false; |
| dev_priv->display_power = true; |
| |
| PSB_WVDC32(dev_priv->pge_ctl | _PSB_PGETBL_ENABLED, PSB_PGETBL_CTL); |
| pci_write_config_word(pdev, PSB_GMCH_CTRL, |
| dev_priv->gmch_ctrl | _PSB_GMCH_ENABLED); |
| |
| psb_gtt_restore(dev); /* Rebuild our GTT mappings */ |
| dev_priv->ops->restore_regs(dev); |
| } |
| |
| /** |
| * gma_suspend_pci - suspend PCI side |
| * @pdev: PCI device |
| * |
| * Perform the suspend processing on our PCI device state |
| */ |
| static void gma_suspend_pci(struct pci_dev *pdev) |
| { |
| struct drm_device *dev = pci_get_drvdata(pdev); |
| struct drm_psb_private *dev_priv = dev->dev_private; |
| int bsm, vbt; |
| |
| if (dev_priv->suspended) |
| return; |
| |
| pci_save_state(pdev); |
| pci_read_config_dword(pdev, 0x5C, &bsm); |
| dev_priv->regs.saveBSM = bsm; |
| pci_read_config_dword(pdev, 0xFC, &vbt); |
| dev_priv->regs.saveVBT = vbt; |
| pci_read_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, &dev_priv->msi_addr); |
| pci_read_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, &dev_priv->msi_data); |
| |
| pci_disable_device(pdev); |
| pci_set_power_state(pdev, PCI_D3hot); |
| |
| dev_priv->suspended = true; |
| } |
| |
| /** |
| * gma_resume_pci - resume helper |
| * @pdev: our PCI device |
| * |
| * Perform the resume processing on our PCI device state - rewrite |
| * register state and re-enable the PCI device |
| */ |
| static bool gma_resume_pci(struct pci_dev *pdev) |
| { |
| struct drm_device *dev = pci_get_drvdata(pdev); |
| struct drm_psb_private *dev_priv = dev->dev_private; |
| int ret; |
| |
| if (!dev_priv->suspended) |
| return true; |
| |
| pci_set_power_state(pdev, PCI_D0); |
| pci_restore_state(pdev); |
| pci_write_config_dword(pdev, 0x5c, dev_priv->regs.saveBSM); |
| pci_write_config_dword(pdev, 0xFC, dev_priv->regs.saveVBT); |
| /* restoring MSI address and data in PCIx space */ |
| pci_write_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, dev_priv->msi_addr); |
| pci_write_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, dev_priv->msi_data); |
| ret = pci_enable_device(pdev); |
| |
| if (ret != 0) |
| dev_err(&pdev->dev, "pci_enable failed: %d\n", ret); |
| else |
| dev_priv->suspended = false; |
| return !dev_priv->suspended; |
| } |
| |
| /** |
| * gma_power_suspend - bus callback for suspend |
| * @_dev: our device |
| * |
| * Called back by the PCI layer during a suspend of the system. We |
| * perform the necessary shut down steps and save enough state that |
| * we can undo this when resume is called. |
| */ |
| int gma_power_suspend(struct device *_dev) |
| { |
| struct pci_dev *pdev = to_pci_dev(_dev); |
| struct drm_device *dev = pci_get_drvdata(pdev); |
| struct drm_psb_private *dev_priv = dev->dev_private; |
| |
| mutex_lock(&power_mutex); |
| if (!dev_priv->suspended) { |
| if (dev_priv->display_count) { |
| mutex_unlock(&power_mutex); |
| dev_err(dev->dev, "GPU hardware busy, cannot suspend\n"); |
| return -EBUSY; |
| } |
| psb_irq_uninstall(dev); |
| gma_suspend_display(dev); |
| gma_suspend_pci(pdev); |
| } |
| mutex_unlock(&power_mutex); |
| return 0; |
| } |
| |
| /** |
| * gma_power_resume - resume power |
| * @_dev: our device |
| * |
| * Resume the PCI side of the graphics and then the displays |
| */ |
| int gma_power_resume(struct device *_dev) |
| { |
| struct pci_dev *pdev = to_pci_dev(_dev); |
| struct drm_device *dev = pci_get_drvdata(pdev); |
| |
| mutex_lock(&power_mutex); |
| gma_resume_pci(pdev); |
| gma_resume_display(pdev); |
| psb_irq_preinstall(dev); |
| psb_irq_postinstall(dev); |
| mutex_unlock(&power_mutex); |
| return 0; |
| } |
| |
| /** |
| * gma_power_is_on - returne true if power is on |
| * @dev: our DRM device |
| * |
| * Returns true if the display island power is on at this moment |
| */ |
| bool gma_power_is_on(struct drm_device *dev) |
| { |
| struct drm_psb_private *dev_priv = dev->dev_private; |
| return dev_priv->display_power; |
| } |
| |
| /** |
| * gma_power_begin - begin requiring power |
| * @dev: our DRM device |
| * @force_on: true to force power on |
| * |
| * Begin an action that requires the display power island is enabled. |
| * We refcount the islands. |
| */ |
| bool gma_power_begin(struct drm_device *dev, bool force_on) |
| { |
| struct drm_psb_private *dev_priv = dev->dev_private; |
| struct pci_dev *pdev = to_pci_dev(dev->dev); |
| int ret; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&power_ctrl_lock, flags); |
| /* Power already on ? */ |
| if (dev_priv->display_power) { |
| dev_priv->display_count++; |
| pm_runtime_get(dev->dev); |
| spin_unlock_irqrestore(&power_ctrl_lock, flags); |
| return true; |
| } |
| if (force_on == false) |
| goto out_false; |
| |
| /* Ok power up needed */ |
| ret = gma_resume_pci(pdev); |
| if (ret == 0) { |
| psb_irq_preinstall(dev); |
| psb_irq_postinstall(dev); |
| pm_runtime_get(dev->dev); |
| dev_priv->display_count++; |
| spin_unlock_irqrestore(&power_ctrl_lock, flags); |
| return true; |
| } |
| out_false: |
| spin_unlock_irqrestore(&power_ctrl_lock, flags); |
| return false; |
| } |
| |
| /** |
| * gma_power_end - end use of power |
| * @dev: Our DRM device |
| * |
| * Indicate that one of our gma_power_begin() requested periods when |
| * the diplay island power is needed has completed. |
| */ |
| void gma_power_end(struct drm_device *dev) |
| { |
| struct drm_psb_private *dev_priv = dev->dev_private; |
| unsigned long flags; |
| spin_lock_irqsave(&power_ctrl_lock, flags); |
| dev_priv->display_count--; |
| WARN_ON(dev_priv->display_count < 0); |
| spin_unlock_irqrestore(&power_ctrl_lock, flags); |
| pm_runtime_put(dev->dev); |
| } |
| |
| int psb_runtime_suspend(struct device *dev) |
| { |
| return gma_power_suspend(dev); |
| } |
| |
| int psb_runtime_resume(struct device *dev) |
| { |
| return gma_power_resume(dev); |
| } |
| |
| int psb_runtime_idle(struct device *dev) |
| { |
| struct drm_device *drmdev = pci_get_drvdata(to_pci_dev(dev)); |
| struct drm_psb_private *dev_priv = drmdev->dev_private; |
| if (dev_priv->display_count) |
| return 0; |
| else |
| return 1; |
| } |
| |
| int gma_power_thaw(struct device *_dev) |
| { |
| return gma_power_resume(_dev); |
| } |
| |
| int gma_power_freeze(struct device *_dev) |
| { |
| return gma_power_suspend(_dev); |
| } |
| |
| int gma_power_restore(struct device *_dev) |
| { |
| return gma_power_resume(_dev); |
| } |
