mmc: core: Always allow the card detect uevent to be consumed

The approach to allow userspace ~5s to consume the uevent, which is triggered when a new card is inserted/initialized, currently requires the mmc host to support system wakeup. This is unnecessary limiting, especially for an mmc host that relies on a GPIO IRQ for card detect. More precisely, the mmc host may not support system wakeup for its corresponding struct device, while the GPIO IRQ still could be configured as a wakeup IRQ via enable_irq_wake(). To support all various cases, let's simply drop the need for the wakeup support. Instead let's always register a wakeup source and activate it for all card detect IRQs by calling __pm_wakeup_event().

Ulf Hansson committed 6 years ago

Commit b52fb251 parent 11ba4683 files · +9 −5Browse files

Showing the changes to include/linux (1 of 3 files). Show all

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include/linux/mmc/host.h+1−0

@@ -287,6 +287,7 @@ struct mmc_host { · 286 unmodified lines
287	287	#ifdef CONFIG_PM_SLEEP
288	288	struct notifier_block pm_notify;
289	289	#endif
	290	+ struct wakeup_source ws; / Enable consume of uevents */
290	291	u32 max_current_330;
291	292	u32 max_current_300;
292	293	u32 max_current_180;