Commit 728e74a4 authored Jun 12, 2018 by Uwe Kleine-König Committed by Greg Kroah-Hartman Jun 28, 2018

serial: imx: fix comment about UCR2_SRST and its handling for shadowing



Initially when register shadowing was introduced (commit 3a0ab62f
("serial: imx: implement shadow registers for UCRx and UFCR")) the logic
to handle UCR2_SRST was wrong but documented consistently. Later the
handling was fixed, but the comment was not. This change makes up leeway
for the latter.

Fixes: 0aa821d8 ("serial: imx: fix cached UCR2 read on software reset")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 7daf201d

drivers/tty/serial/imx.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -314,7 +314,8 @@ static u32 imx_uart_readl(struct imx_port *sport, u32 offset)
		/*
		* UCR2_SRST is the only bit in the cached registers that might
		* differ from the value that was last written. As it only
		* clears after being set, reread conditionally.
		* automatically becomes one after being cleared, reread
		* conditionally.
		*/
		if (!(sport->ucr2 & UCR2_SRST))
		sport->ucr2 = readl(sport->port.membase + offset);