diff options
Diffstat (limited to 'drivers/gpu/drm/gma500/power.c')
| -rw-r--r-- | drivers/gpu/drm/gma500/power.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/drivers/gpu/drm/gma500/power.c b/drivers/gpu/drm/gma500/power.c new file mode 100644 index 0000000000..186af29bea --- /dev/null +++ b/drivers/gpu/drm/gma500/power.c @@ -0,0 +1,232 @@ +/************************************************************************** + * 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 "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); +} |