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console: uart_console: handle runtime PM

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Allow the uart_console console_out implementation to integrate with
'Device Runtime Power Management'.

Without using runtime PM, it is impossible for the application to manage
the power state of a UART instance, given that any module in the
application could theoretically LOG_* or printk at any point in time.

This removes the need to manually call `pm_device_state_set` when the
lowest power states must be reached, while still allowing console and
printk messages to be output.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
This commit is contained in:
Jordan Yates 2020-06-24 15:11:56 +10:00 committed by Carles Cufí
parent e0fbd35fc0
commit 0561d0dd59
1 changed files with 15 additions and 0 deletions
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15
drivers/console/uart_console.c
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@ -31,6 +31,7 @@
#include <zephyr/linker/sections.h>
#include <zephyr/sys/atomic.h>
#include <zephyr/sys/printk.h>
#include <zephyr/pm/device_runtime.h>
#ifdef CONFIG_UART_CONSOLE_MCUMGR
#include <zephyr/mgmt/mcumgr/transport/serial.h>
#endif
@ -86,11 +87,25 @@ static int console_out(int c)
#endif /* CONFIG_UART_CONSOLE_DEBUG_SERVER_HOOKS */
if (pm_device_runtime_is_enabled(uart_console_dev)) {
if (pm_device_runtime_get(uart_console_dev) < 0) {
/* Enabling the UART instance has failed but this
* function MUST return the byte output.
*/
return c;
}
}
if ('\n' == c) {
uart_poll_out(uart_console_dev, '\r');
}
uart_poll_out(uart_console_dev, c);
if (pm_device_runtime_is_enabled(uart_console_dev)) {
/* As errors cannot be returned, ignore the return value */
(void)pm_device_runtime_put(uart_console_dev);
}
return c;
}