From b0d17fbdacb32f9f4b9ee1ad2b8f42f6a480d842 Mon Sep 17 00:00:00 2001 From: Samuel Iglesias Gonsalvez Date: Mon, 10 Dec 2012 11:50:07 +0100 Subject: [PATCH] ipack/devices/ipoctal: add rx_enable flag Thus, we don't enable RX when a termios setup has been called, as it could be disabled previously. As the control registers (Rx, Tx flags specifically) cannot be read from the device, we keep this info in rx_enable. Signed-off-by: Samuel Iglesias Gonsalvez Signed-off-by: Greg Kroah-Hartman --- drivers/ipack/devices/ipoctal.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/ipack/devices/ipoctal.c b/drivers/ipack/devices/ipoctal.c index 34fcfce0cdd9..8666d2d05eef 100644 --- a/drivers/ipack/devices/ipoctal.c +++ b/drivers/ipack/devices/ipoctal.c @@ -43,6 +43,7 @@ struct ipoctal_channel { unsigned int board_id; u8 isr_rx_rdy_mask; u8 isr_tx_rdy_mask; + unsigned int rx_enable; }; struct ipoctal { @@ -65,6 +66,7 @@ static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty) * there is something to send */ iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); + channel->rx_enable = 1; return 0; } @@ -309,6 +311,7 @@ static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr, } iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); + channel->rx_enable = 0; iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY, @@ -430,6 +433,7 @@ static int ipoctal_write_tty(struct tty_struct *tty, /* As the IP-OCTAL 485 only supports half duplex, do it manually */ if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) { iowrite8(CR_DISABLE_RX, &channel->regs->w.cr); + channel->rx_enable = 0; iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr); } @@ -589,8 +593,9 @@ static void ipoctal_set_termios(struct tty_struct *tty, iowrite8(mr2, &channel->regs->w.mr); iowrite8(csr, &channel->regs->w.csr); - /* Enable again the RX */ - iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); + /* Enable again the RX, if it was before */ + if (channel->rx_enable) + iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); } static void ipoctal_hangup(struct tty_struct *tty) @@ -610,6 +615,7 @@ static void ipoctal_hangup(struct tty_struct *tty) tty_port_hangup(&channel->tty_port); iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); + channel->rx_enable = 0; iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr); -- 2.34.1