Messages in this thread Patch in this message | | | From | sxauwsk <> | Subject | [PATCH] spi: cadence: Add usleep_range() for cdns_spi_fill_tx_fifo() | Date | Mon, 9 Apr 2018 19:16:50 +0800 |
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In case of xspi work in busy condition, may send bytes failed. Add one bytes delay
Signed-off-by: sxauwsk <sxauwsk@163.com> Signed-off-by: guojian <guojian@innoinstrument.net> Signed-off-by: wangshikai <wangshikai@inno-instrument.cn> --- drivers/spi/spi-cadence.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/spi/spi-cadence.c b/drivers/spi/spi-cadence.c index 5c9516a..66ae055 100644 --- a/drivers/spi/spi-cadence.c +++ b/drivers/spi/spi-cadence.c @@ -313,6 +313,12 @@ static void cdns_spi_fill_tx_fifo(struct cdns_spi *xspi) while ((trans_cnt < CDNS_SPI_FIFO_DEPTH) && (xspi->tx_bytes > 0)) { + + /* When xspi in busy condition, bytes may send failed, + * caused communication failure so add one byte delay + */ + usleep_range(10, 20); + if (xspi->txbuf) cdns_spi_write(xspi, CDNS_SPI_TXD, *xspi->txbuf++); else -- 1.7.9.5
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