serial: Call set_custom_baudrate() thrice

Call the function before tcsetattr() settings are known, then again
with settings prepared but not yet applied and finally a third time
after tcsetattr().

Darwin support needs this change; there custom_baud code must be
called to modify the settings passed to tcsetattr() and then again
after tcsetattr() returns.

The change should be non-functional on all currently supported systems;
current code calls set_custom_baudrate() before any tcsetattr()
settings are prepared, so we have three stages in total.

This change originates from discussion of the macOS patch proposed by
Denis Ahrens in https://review.coreboot.org/c/flashrom/+/67822

Change-Id: I40cc443cfb7bf6b212b31826d437b898cc13c427
Signed-off-by: Peter Stuge <peter@stuge.se>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/70569
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Thomas Heijligen <src@posteo.de>

1 files changed, 5 insertions, 1 deletions

diff --git a/custom_baud_linux.c b/custom_baud_linux.c
index 2d5f261d..761d4961 100644
--- a/custom_baud_linux.c
+++ b/custom_baud_linux.c
@@ -29,9 +29,13 @@
  * for more info.
  */
 
-int set_custom_baudrate(int fd, unsigned int baud)
+int set_custom_baudrate(int fd, unsigned int baud, const enum custom_baud_stage stage, void *tio_wanted)
 {
 	struct termios2 tio;
+
+	if (stage != BEFORE_FLAGS)
+		return 0;
+
 	if (ioctl(fd, TCGETS2, &tio)) {
 		return -1;
 	}