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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-07-01 17:13:54 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-07-01 17:13:54 +0000 |
commit | 2957e9a7ea070524508a846205689431cb5c101f (patch) | |
tree | 42f079ff82e701ebcb76829974b4caca3e5b6798 /drivers/tty/serial/sc16is7xx.c | |
parent | Adding upstream version 6.9.2. (diff) | |
download | linux-2957e9a7ea070524508a846205689431cb5c101f.tar.xz linux-2957e9a7ea070524508a846205689431cb5c101f.zip |
Adding upstream version 6.9.7.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/tty/serial/sc16is7xx.c')
-rw-r--r-- | drivers/tty/serial/sc16is7xx.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index 929206a9a6..ace2c4b333 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -18,6 +18,7 @@ #include <linux/module.h> #include <linux/property.h> #include <linux/regmap.h> +#include <linux/sched.h> #include <linux/serial_core.h> #include <linux/serial.h> #include <linux/tty.h> @@ -25,7 +26,6 @@ #include <linux/spi/spi.h> #include <linux/uaccess.h> #include <linux/units.h> -#include <uapi/linux/sched/types.h> #define SC16IS7XX_NAME "sc16is7xx" #define SC16IS7XX_MAX_DEVS 8 @@ -554,16 +554,28 @@ static bool sc16is7xx_regmap_noinc(struct device *dev, unsigned int reg) return reg == SC16IS7XX_RHR_REG; } +/* + * Configure programmable baud rate generator (divisor) according to the + * desired baud rate. + * + * From the datasheet, the divisor is computed according to: + * + * XTAL1 input frequency + * ----------------------- + * prescaler + * divisor = --------------------------- + * baud-rate x sampling-rate + */ static int sc16is7xx_set_baud(struct uart_port *port, int baud) { struct sc16is7xx_one *one = to_sc16is7xx_one(port, port); u8 lcr; - u8 prescaler = 0; + unsigned int prescaler = 1; unsigned long clk = port->uartclk, div = clk / 16 / baud; if (div >= BIT(16)) { - prescaler = SC16IS7XX_MCR_CLKSEL_BIT; - div /= 4; + prescaler = 4; + div /= prescaler; } /* Enable enhanced features */ @@ -573,9 +585,10 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud) SC16IS7XX_EFR_ENABLE_BIT); sc16is7xx_efr_unlock(port); + /* If bit MCR_CLKSEL is set, the divide by 4 prescaler is activated. */ sc16is7xx_port_update(port, SC16IS7XX_MCR_REG, SC16IS7XX_MCR_CLKSEL_BIT, - prescaler); + prescaler == 1 ? 0 : SC16IS7XX_MCR_CLKSEL_BIT); /* Backup LCR and access special register set (DLL/DLH) */ lcr = sc16is7xx_port_read(port, SC16IS7XX_LCR_REG); @@ -591,7 +604,7 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud) /* Restore LCR and access to general register set */ sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr); - return DIV_ROUND_CLOSEST(clk / 16, div); + return DIV_ROUND_CLOSEST((clk / prescaler) / 16, div); } static void sc16is7xx_handle_rx(struct uart_port *port, unsigned int rxlen, |