From: Geert Uytterhoeven Date: Mon, 1 Apr 2019 11:25:10 +0000 (+0200) Subject: serial: sh-sci: Fix HSCIF RX sampling point calculation X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ace965696da2611af759f0284e26342b7b6cec89;p=openwrt%2Fstaging%2Fblogic.git serial: sh-sci: Fix HSCIF RX sampling point calculation There are several issues with the formula used for calculating the deviation from the intended rate: 1. While min_err and last_stop are signed, srr and baud are unsigned. Hence the signed values are promoted to unsigned, which will lead to a bogus value of deviation if min_err is negative, 2. Srr is the register field value, which is one less than the actual sampling rate factor, 3. The divisions do not use rounding. Fix this by casting unsigned variables to int, adding one to srr, and using a single DIV_ROUND_CLOSEST(). Fixes: 63ba1e00f178a448 ("serial: sh-sci: Support for HSCIF RX sampling point adjustment") Signed-off-by: Geert Uytterhoeven Reviewed-by: Mukesh Ojha Cc: stable Reviewed-by: Ulrich Hecht Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 2d1c626312cd..55ef6e577f46 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -2512,7 +2512,9 @@ done: * center of the last stop bit in sampling clocks. */ int last_stop = bits * 2 - 1; - int deviation = min_err * srr * last_stop / 2 / baud; + int deviation = DIV_ROUND_CLOSEST(min_err * last_stop * + (int)(srr + 1), + 2 * (int)baud); if (abs(deviation) >= 2) { /* At least two sampling clocks off at the