On Sunday 11 July 2021 15:02:41 gregkh@linuxfoundation.org wrote:

The patch below does not apply to the 4.19-stable tree.

Hello Greg!

I have tested this it and it applies cleanly. I have just called following commands on top of linux-4.19.y branch without any manual backporting and there were no issues.

git cherry-pick 0e4cf69ede87 git cherry-pick 9078204ca5c3

Could you look at it, why it is failing for you?

If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 9078204ca5c33ba20443a8623a41a68a9995a70d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= pali@kernel.org Date: Fri, 25 Jun 2021 00:49:00 +0200 Subject: [PATCH] serial: mvebu-uart: fix calculation of clock divisor MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

The clock divisor should be rounded to the closest value.

Signed-off-by: Pali Rohár pali@kernel.org Fixes: 68a0db1d7da2 ("serial: mvebu-uart: add function to change baudrate") Cc: stable@vger.kernel.org # 0e4cf69ede87 ("serial: mvebu-uart: clarify the baud rate derivation") Link: https://lore.kernel.org/r/20210624224909.6350-2-pali@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c index 04c41689d81c..f3ecbcf495ee 100644 --- a/drivers/tty/serial/mvebu-uart.c +++ b/drivers/tty/serial/mvebu-uart.c @@ -463,7 +463,7 @@ static int mvebu_uart_baud_rate_set(struct uart_port *port, unsigned int baud) * makes use of D to configure the desired baudrate. */ m_divisor = OSAMP_DEFAULT_DIVISOR;

• d_divisor = DIV_ROUND_UP(port->uartclk, baud * m_divisor);

• d_divisor = DIV_ROUND_CLOSEST(port->uartclk, baud * m_divisor);

brdv = readl(port->membase + UART_BRDV); brdv &= ~BRDV_BAUD_MASK;