From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Ivan T. Ivanov" Subject: [PATCH 7/7] tty: serial: msm: Remove 115.2 Kbps maximum baud rate limitation Date: Sat, 12 Sep 2015 16:02:14 +0300 Message-ID: <1442062934-13449-8-git-send-email-ivan.ivanov@linaro.org> References: <1442062934-13449-1-git-send-email-ivan.ivanov@linaro.org> Return-path: In-Reply-To: <1442062934-13449-1-git-send-email-ivan.ivanov@linaro.org> Sender: linux-arm-msm-owner@vger.kernel.org To: Andy Gross Cc: David Brown , Greg Kroah-Hartman , Jiri Slaby , Frank Rowand , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, linux-serial@vger.kernel.org List-Id: devicetree@vger.kernel.org UART controller is capable to perform transfers up to 4 Mbps. Remove artificial 115.2 Kbps limitation. Signed-off-by: Ivan T. Ivanov --- drivers/tty/serial/msm_serial.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c index 3f975392ebc0..223514979685 100644 --- a/drivers/tty/serial/msm_serial.c +++ b/drivers/tty/serial/msm_serial.c @@ -880,6 +880,7 @@ msm_find_best_baud(struct uart_port *port, unsigned int baud) { 3, 0xdd, 8 }, { 2, 0xee, 16 }, { 1, 0xff, 31 }, + { 0, 0xff, 31 }, }; divisor = uart_get_divisor(port, baud); @@ -891,16 +892,29 @@ msm_find_best_baud(struct uart_port *port, unsigned int baud) return entry; /* Default to smallest divider */ } -static int msm_set_baud_rate(struct uart_port *port, unsigned int baud) +static int msm_set_baud_rate(struct uart_port *port, unsigned int baud, + unsigned long *saved_flags) { unsigned int rxstale, watermark, mask; struct msm_port *msm_port = UART_TO_MSM(port); const struct msm_baud_map *entry; + unsigned long flags; entry = msm_find_best_baud(port, baud); msm_write(port, entry->code, UART_CSR); + if (baud > 460800) + port->uartclk = baud * 16; + + flags = *saved_flags; + spin_unlock_irqrestore(&port->lock, flags); + + clk_set_rate(msm_port->clk, port->uartclk); + + spin_lock_irqsave(&port->lock, flags); + *saved_flags = flags; + /* RX stale watermark */ rxstale = entry->rxstale; watermark = UART_IPR_STALE_LSB & rxstale; @@ -1024,8 +1038,8 @@ static void msm_set_termios(struct uart_port *port, struct ktermios *termios, msm_stop_dma(port, dma); /* calculate and set baud rate */ - baud = uart_get_baud_rate(port, termios, old, 300, 115200); - baud = msm_set_baud_rate(port, baud); + baud = uart_get_baud_rate(port, termios, old, 300, 4000000); + baud = msm_set_baud_rate(port, baud, &flags); if (tty_termios_baud_rate(termios)) tty_termios_encode_baud_rate(termios, baud, baud); -- 1.9.1