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Commit e8823f1c authored by Jun Chen's avatar Jun Chen Committed by Greg Kroah-Hartman
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serial: ifx6x60: ifx_spi_write don't need to do mrdy_assert when fifo is not empty 



This patch check whether the fifo lenth is empty before writing new data to fifo.If condition
is true,ifx_spi_write need to trigger one mrdy_assert. If condition is false,the mrdy_assert
will be trigger by the next ifx_spi_io.

Cc: Bi Chao <chao.bi@intel.com>
Signed-off-by: default avatarChen Jun <jun.d.chen@intel.com>
Acked-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1b2f8a95

drivers/tty/serial/ifx6x60.c

+10 −3
Original line number Diff line number Diff line
@@ -508,9 +508,16 @@ static int ifx_spi_write(struct tty_struct *tty, const unsigned char *buf, 
{

	struct ifx_spi_device *ifx_dev = tty->driver_data;

	unsigned char *tmp_buf = (unsigned char *)buf;

	int tx_count = kfifo_in_locked(&ifx_dev->tx_fifo, tmp_buf, count,

				   &ifx_dev->fifo_lock);

	unsigned long flags;

	bool is_fifo_empty;



	spin_lock_irqsave(&ifx_dev->fifo_lock, flags);

	is_fifo_empty = kfifo_is_empty(&ifx_dev->tx_fifo);

	int tx_count = kfifo_in(&ifx_dev->tx_fifo, tmp_buf, count);

	spin_unlock_irqrestore(&ifx_dev->fifo_lock, flags);

	if (is_fifo_empty)

		mrdy_assert(ifx_dev);



	return tx_count;

}