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From: Daniel Winkler <danielwinkler@google.com>
To: linux-serial@vger.kernel.org, linux-mediatek@lists.infradead.org
Cc: chromeos-bluetooth-upstreaming 
	<chromeos-bluetooth-upstreaming@chromium.org>,
	Daniel Winkler <danielwinkler@google.com>,
	Aaron Sierra <asierra@xes-inc.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jslaby@suse.com>, Lukas Wunner <lukas@wunner.de>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH] Revert "serial: 8250: Fix max baud limit in generic 8250 port"
Date: Tue, 30 Jun 2020 16:42:11 -0700
Message-ID: <20200630164204.1.I2cc415fa5793b3e55acfd521ba8f0a71e79aa5f1@changeid> (raw)

This reverts commit 0eeaf62981ecc79e8395ca8caa1570eaf3a12257.

The change regresses the QCA6174A-3 bluetooth chip, preventing
firmware from being properly loaded. We have verified that without
this patch, the chip works as intended.

Signed-off-by: Daniel Winkler <danielwinkler@google.com>
---

 drivers/tty/serial/8250/8250_port.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 1632f7d25acca..e057c65ac1580 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2618,8 +2618,6 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port,
 					     struct ktermios *termios,
 					     struct ktermios *old)
 {
-	unsigned int tolerance = port->uartclk / 100;
-
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 * Allow 1% tolerance at the upper limit so uart clks marginally
@@ -2628,7 +2626,7 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port,
 	 */
 	return uart_get_baud_rate(port, termios, old,
 				  port->uartclk / 16 / UART_DIV_MAX,
-				  (port->uartclk + tolerance) / 16);
+				  port->uartclk);
 }
 
 void
-- 
2.27.0.212.ge8ba1cc988-goog


             reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-30 23:42 Daniel Winkler [this message]
2020-07-01  4:30 ` Lukas Wunner
2020-07-01 11:39   ` Serge Semin
2020-07-01 12:46     ` Alain Michaud
2020-07-01 13:26 ` Greg Kroah-Hartman
2020-07-01 18:26   ` Daniel Winkler

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