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serial: sc16is7xx: replace hardcoded divisor value with BIT() macro

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[ Upstream commit 2e57cefc4477659527f7adab1f87cdbf60ef1ae6 ]

To better show why the limit is what it is, since we have only 16 bits for
the divisor.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20231221231823.2327894-13-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: 8492bd91aa05 ("serial: sc16is7xx: fix bug in sc16is7xx_set_baud() when using prescaler")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hugo Villeneuve
2023-12-21 18:18:19 -05:00
committed by Greg Kroah-Hartman
parent c0b8f49183
commit aeb2b22e4f
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/sc16is7xx.c
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@@ -489,7 +489,7 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud)
u8 prescaler = 0; u8 prescaler = 0;
unsigned long clk = port->uartclk, div = clk / 16 / baud; unsigned long clk = port->uartclk, div = clk / 16 / baud;
if (div > 0xffff) { if (div >= BIT(16)) {
prescaler = SC16IS7XX_MCR_CLKSEL_BIT; prescaler = SC16IS7XX_MCR_CLKSEL_BIT;
div /= 4; div /= 4;
} }