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| author | Tom Rini <trini@konsulko.com> | 2022-09-24 13:58:49 -0400 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2022-09-24 13:58:49 -0400 |
| commit | 81da5042e514bfd27516d3530dde4d62a6708ca4 (patch) | |
| tree | 75203cc106a2c1c340024fdb562be7c9b6d0e4e2 /include/stdio_dev.h | |
| parent | 694e9008674c2008b9ccdc25a9bb3ac078e20911 (diff) | |
| parent | efc3f9526f9cfcd8614668c03b9c66b209782c41 (diff) | |
Merge branch '2022-09-24-add-console-flush' into next
To quote the author:
On certain places it is required to flush output print buffers to ensure
that text strings were sent to console or serial devices. For example when
printing message that U-Boot is going to boot kernel or when U-Boot is
going to change baudrate of terminal device.
Some console devices, like UART, have putc/puts functions which just put
characters into HW transmit queue and do not wait until all data are
transmitted. Doing some sensitive operations (like changing baudrate or
starting kernel which resets UART HW) cause that U-Boot messages are lost.
Therefore introduce a new flush() function, implement it for all serial
devices via pending(false) callback and use this new flush() function on
sensitive places after which output device may go into reset state.
This change fixes printing of U-Boot messages:
"## Starting application at ..."
"## Switch baudrate to ..."
In addition, take a patch from Heinrich to rename some EFI test
functions in order to not conflict with this series.
Diffstat (limited to 'include/stdio_dev.h')
| -rw-r--r-- | include/stdio_dev.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/stdio_dev.h b/include/stdio_dev.h index 270fa2729fb..3105928970d 100644 --- a/include/stdio_dev.h +++ b/include/stdio_dev.h @@ -37,6 +37,13 @@ struct stdio_dev { void (*putc)(struct stdio_dev *dev, const char c); /* To put a string (accelerator) */ void (*puts)(struct stdio_dev *dev, const char *s); +#ifdef CONFIG_CONSOLE_FLUSH_SUPPORT + /* To flush output queue */ + void (*flush)(struct stdio_dev *dev); +#define STDIO_DEV_ASSIGN_FLUSH(dev, flush_func) ((dev)->flush = (flush_func)) +#else +#define STDIO_DEV_ASSIGN_FLUSH(dev, flush_func) +#endif /* INPUT functions */ |