/**************************************************************************
* 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 <[email protected]>
* Rajesh Poornachandran <[email protected]>
* Massively reworked
* Alan Cox <[email protected]>
*/
#include "gem.h"
#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>
/**
* 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 = to_drm_psb_private(dev);
/* FIXME: Move APM/OSPM base into relevant device code */
dev_priv->apm_base = dev_priv->apm_reg & 0xffff;
dev_priv->ospm_base &= 0xffff;
if (dev_priv->ops->init_pm)
dev_priv->ops->init_pm(dev);
/*
* Runtime pm support is broken atm. So for now unconditionally
* call pm_runtime_get() here and put it again in psb_driver_unload()
*
* To fix this we need to call pm_runtime_get() once for each active
* pipe at boot and then put() / get() for each pipe disable / enable
* so that the device gets runtime suspended when no pipes are active.
* Once this is in place the pm_runtime_get() below should be replaced
* by a pm_runtime_allow() call to undo the pm_runtime_forbid() from
* pci_pm_init().
*/
pm_runtime_get(dev->dev);
dev_priv->pm_initialized = true;
}
/**
* 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)
{
struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
if (!dev_priv->pm_initialized)
return;
pm_runtime_put_noidle(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 = to_drm_psb_private(dev);
dev_priv->ops->save_regs(dev);
dev_priv->ops->power_down(dev);
}
/**
* 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 = to_drm_psb_private(dev);
/* turn on the display power island */
dev_priv->ops->power_up(dev);
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);
/* Rebuild our GTT mappings */
psb_gtt_resume(dev);
psb_gem_mm_resume(dev);
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 = to_drm_psb_private(dev);
int bsm, vbt;
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_disable_device(pdev);
pci_set_power_state(pdev, PCI_D3hot);
}
/**
* 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 int gma_resume_pci(struct pci_dev *pdev)
{
struct drm_device *dev = pci_get_drvdata(pdev);
struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
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);
return pci_enable_device(pdev);
}
/**
* 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);
gma_irq_uninstall(dev);
gma_suspend_display(dev);
gma_suspend_pci(pdev);
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);
gma_resume_pci(pdev);
gma_resume_display(pdev);
gma_irq_install(dev);
return 0;
}
/**
* 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)
{
if (force_on)
return pm_runtime_resume_and_get(dev->dev) == 0;
else
return pm_runtime_get_if_in_use(dev->dev) == 1;
}
/**
* 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)
{
pm_runtime_put(dev->dev);
}
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