From: Michal Simek Date: Tue, 10 Apr 2018 13:32:28 +0000 (+0200) Subject: earlycon: Initialize port->uartclk based on clock-frequency property X-Git-Tag: v4.18-rc1~133^2~47 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=814453adea7d081ad8917aa0f32d6a14165a3563;p=linux.git earlycon: Initialize port->uartclk based on clock-frequency property On DT based platforms when current-speed property is present baudrate is setup. Also port->uartclk is initialized to bogus BASE_BAUD * 16 value. Drivers like uartps/ns16550 contain logic when baudrate and uartclk is used for baudrate calculation. The patch is reading optional clock-frequency property to replace bogus BASE_BAUD * 16 calculation to have proper baudrate calculation. Signed-off-by: Michal Simek Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index a24278380fec..eb1f84258c44 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -279,6 +279,10 @@ int __init of_setup_earlycon(const struct earlycon_id *match, if (val) early_console_dev.baud = be32_to_cpu(*val); + val = of_get_flat_dt_prop(node, "clock-frequency", NULL); + if (val) + port->uartclk = be32_to_cpu(*val); + if (options) { early_console_dev.baud = simple_strtoul(options, NULL, 0); strlcpy(early_console_dev.options, options,