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Diffstat (limited to 'drivers/gpu/drm/gma500/power.c')
-rw-r--r--drivers/gpu/drm/gma500/power.c232
1 files changed, 232 insertions, 0 deletions
diff --git a/drivers/gpu/drm/gma500/power.c b/drivers/gpu/drm/gma500/power.c
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index 0000000000..186af29bea
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+++ b/drivers/gpu/drm/gma500/power.c
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+/**************************************************************************
+ * 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);
+}