drivers/gpu/drm/gma500/power.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/gma500/power.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/gma500/power.c
Extension
.c
Size
6594 bytes
Lines
233
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#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);

Annotation

Implementation Notes