Commit bd880b00 authored Sep 08, 2019 by Ulf Hansson

mmc: core: Add helper function to indicate if SDIO IRQs is enabled



To avoid each host driver supporting SDIO IRQs, from keeping track
internally about if SDIO IRQs has been claimed, let's introduce a common
helper function, sdio_irq_claimed().

The function returns true if SDIO IRQs are claimed, via using the
information about the number of claimed irqs. This is safe, even without
any locks, as long as the helper function is called only from
runtime/system suspend callbacks of the host driver.

Tested-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

parent 20964a11

include/linux/mmc/host.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -493,6 +493,15 @@ void mmc_command_done(struct mmc_host host, struct mmc_request mrq);

		void mmc_cqe_request_done(struct mmc_host host, struct mmc_request mrq);

		/*
		* May be called from host driver's system/runtime suspend/resume callbacks,
		* to know if SDIO IRQs has been claimed.
		*/
		static inline bool sdio_irq_claimed(struct mmc_host *host)
		{
		return host->sdio_irqs > 0;
		}

		static inline void mmc_signal_sdio_irq(struct mmc_host *host)
		{
		host->ops->enable_sdio_irq(host, 0);

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