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Commit 0425a142 authored by Russell King's avatar Russell King Committed by Russell King
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[MMC] mmci: allow small data transfers 



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: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 10ee39fe

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