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Commit 810a58b0 authored by Qipan Li's avatar Qipan Li Committed by Mark Brown
Browse files

spi: sirf: add fifo reset/start for cmd transfer 



for command mode spi transfer, HW spec requires to do fifo reset work to
clear FIFO status.

Signed-off-by: default avatarQipan Li <Qipan.Li@csr.com>
Signed-off-by: default avatarBarry Song <Baohua.Song@csr.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent f2a08b40

drivers/spi/spi-sirf.c

+2 −0
Original line number Diff line number Diff line
@@ -312,6 +312,8 @@ static int spi_sirfsoc_cmd_transfer(struct spi_device *spi, 
	u32 cmd;



	sspi = spi_master_get_devdata(spi->master);

	writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_TXFIFO_OP);

	writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_TXFIFO_OP);

	memcpy(&cmd, sspi->tx, t->len);

	if (sspi->word_width == 1 && !(spi->mode & SPI_LSB_FIRST))

		cmd = cpu_to_be32(cmd) >>