From: Alex Elder Date: Fri, 11 Apr 2025 20:38:27 +0000 (-0500) Subject: serial: 8250_of: manage bus clock in suspend/resume X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=926040da60642335969ff99fa2ba67e4e0bb2618;p=users%2Fjedix%2Flinux-maple.git serial: 8250_of: manage bus clock in suspend/resume Save the bus clock pointer in the of_serial_info structure, and use that to disable the bus clock on suspend and re-enable it on resume. Signed-off-by: Alex Elder Reviewed-by: Andy Shevchenko Reviewed-by: Yixun Lan Link: https://lore.kernel.org/r/20250411203828.1491595-4-elder@riscstar.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c index a90a5462aa72a..d178b6c54ea18 100644 --- a/drivers/tty/serial/8250/8250_of.c +++ b/drivers/tty/serial/8250/8250_of.c @@ -24,6 +24,7 @@ struct of_serial_info { struct clk *clk; + struct clk *bus_clk; struct reset_control *rst; int type; int line; @@ -138,6 +139,7 @@ static int of_platform_serial_setup(struct platform_device *ofdev, goto err_pmruntime; } + info->bus_clk = bus_clk; port->uartclk = clk_get_rate(info->clk); } /* If current-speed was set, then try not to change it. */ @@ -299,6 +301,7 @@ static int of_serial_suspend(struct device *dev) if (!uart_console(port) || console_suspend_enabled) { pm_runtime_put_sync(dev); clk_disable_unprepare(info->clk); + clk_disable_unprepare(info->bus_clk); } return 0; } @@ -311,6 +314,7 @@ static int of_serial_resume(struct device *dev) if (!uart_console(port) || console_suspend_enabled) { pm_runtime_get_sync(dev); + clk_prepare_enable(info->bus_clk); clk_prepare_enable(info->clk); }