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mmc: sdhci-pci: add runtime pm support

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Ths patch allows runtime PM for sdhci-pci, runtime suspending after
inactivity of 50ms and ensuring runtime resume before SDHC registers
are accessed.  During runtime suspend, interrupts are masked.
The host controller state is restored at runtime resume.

For Medfield, the host controller's card detect mechanism is
supplanted by an always-on GPIO which provides for card detect wake-up.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Adrian Hunter
2011-10-03 15:33:34 +03:00
committed by Chris Ball
parent 08a7e1dfaa
commit 66fd8ad510
4 changed files with 405 additions and 45 deletions
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5
drivers/mmc/host/sdhci.h
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@@ -379,4 +379,9 @@ extern int sdhci_resume_host(struct sdhci_host *host);
extern void sdhci_enable_irq_wakeups(struct sdhci_host *host);
#endif
#ifdef CONFIG_PM_RUNTIME
extern int sdhci_runtime_suspend_host(struct sdhci_host *host);
extern int sdhci_runtime_resume_host(struct sdhci_host *host);
#endif
#endif /* __SDHCI_HW_H */