[MMC] mmci: allow small data transfers (0425a142) · Commits · 戴 / test

If a data transfer is small (less than a FIFO size) we would hang waiting for the data to be read due to the PIO interrupt not occuring. We allowed for this in our PIO interrupt handler, but not when setting up a data transfer. Apply the "fix" when setting up a data transfer as well. Signed-off-by:

Russell King <rmk+kernel@arm.linux.org.uk>

drivers/mmc/mmci.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -97,6 +97,13 @@ static void mmci_start_data(struct mmci_host host, struct mmc_data data)
		if (data->flags & MMC_DATA_READ) {
		datactrl \|= MCI_DPSM_DIRECTION;
		irqmask = MCI_RXFIFOHALFFULLMASK;

		/*
		* If we have less than a FIFOSIZE of bytes to transfer,
		* trigger a PIO interrupt as soon as any data is available.
		*/
		if (host->size < MCI_FIFOSIZE)
		irqmask \|= MCI_RXDATAAVLBLMASK;
		} else {
		/*
		* We don't actually need to include "FIFO empty" here

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