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serial: sirf: fix the issue that HW flow control doesn't work for BT

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>From HW spec, when rxfifo's data is less than AFC_RX_THD(RX threshhold), RTS
signal is active. otherwise, RTS signal is inactive.

Crrently the RX threshhold is set as zero, so RTS has no chance to be
active. This patch replaces the default 0 by a positive number.

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Qipan Li 2015-05-14 06:45:22 +00:00 committed by Greg Kroah-Hartman
parent c1b7ac6f4d
commit eab192ae56
1 changed files with 2 additions and 1 deletions
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3
drivers/tty/serial/sirfsoc_uart.c
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@ -344,7 +344,8 @@ static void sirfsoc_uart_enable_ms(struct uart_port *port)
if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
wr_regl(port, ureg->sirfsoc_afc_ctrl, wr_regl(port, ureg->sirfsoc_afc_ctrl,
rd_regl(port, ureg->sirfsoc_afc_ctrl) | rd_regl(port, ureg->sirfsoc_afc_ctrl) |
SIRFUART_AFC_TX_EN | SIRFUART_AFC_RX_EN); SIRFUART_AFC_TX_EN | SIRFUART_AFC_RX_EN |
SIRFUART_AFC_CTRL_RX_THD);
if (!sirfport->is_atlas7) if (!sirfport->is_atlas7)
wr_regl(port, ureg->sirfsoc_int_en_reg, wr_regl(port, ureg->sirfsoc_int_en_reg,
rd_regl(port, ureg->sirfsoc_int_en_reg) rd_regl(port, ureg->sirfsoc_int_en_reg)