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dm: serial: Reset the watchdog while waiting in getc()

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We have moved the busy-wait loop out of drivers and into the uclass. This
means that we must reset the watchdog when busy-waiting.

Note: some drivers may still have a busy-wait even with driver model, as
a transition mechanism. Driver model will tolerate this, and is can be
cleaned up when all users of the driver use driver model. An example is
ns16550.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@ti.com>
This commit is contained in:
Simon Glass 2014-10-22 21:37:02 -06:00
parent fe1ef50338
commit c487fd476c
1 changed files with 5 additions and 0 deletions
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5
drivers/serial/serial-uclass.c
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@ -11,9 +11,12 @@
#include <os.h>
#include <serial.h>
#include <stdio_dev.h>
#include <watchdog.h>
#include <dm/lists.h>
#include <dm/device-internal.h>
#include <ns16550.h>
DECLARE_GLOBAL_DATA_PTR;
/* The currently-selected console serial device */
@ -119,6 +122,8 @@ static int serial_getc_dev(struct udevice *dev)
do {
err = ops->getc(dev);
if (err == -EAGAIN)
WATCHDOG_RESET();
} while (err == -EAGAIN);
return err >= 0 ? err : 0;