From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sonic Zhang Date: Mon, 4 Mar 2013 15:20:09 +0800 Subject: [U-Boot] [PATCH v1 2/2] bfin: discard invalid data and clear RXS in bf5xx spi driver In-Reply-To: <1362381609-23716-1-git-send-email-sonic.adi@gmail.com> References: <1362381609-23716-1-git-send-email-sonic.adi@gmail.com> Message-ID: <1362381609-23716-2-git-send-email-sonic.adi@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de From: Scott Jiang There may be dirty data in RDBR, so we should discard invalid data. This operation also clears RXS bit in STAT register. Signed-off-by: Scott Jiang Signed-off-by: Sonic Zhang --- drivers/spi/bfin_spi.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/drivers/spi/bfin_spi.c b/drivers/spi/bfin_spi.c index fff384a..1845e4f 100644 --- a/drivers/spi/bfin_spi.c +++ b/drivers/spi/bfin_spi.c @@ -250,6 +250,8 @@ void spi_release_bus(struct spi_slave *slave) static int spi_pio_xfer(struct bfin_spi_slave *bss, const u8 *tx, u8 *rx, uint bytes) { + /* discard invalid data and clear RXS */ + read_SPI_RDBR(bss); /* todo: take advantage of hardware fifos */ while (bytes--) { u8 value = (tx ? *tx++ : CONFIG_BFIN_SPI_IDLE_VAL); -- 1.7.0.4