On Tue, 29 Sep 2020 at 01:41, Naresh Kamboju naresh.kamboju@linaro.org wrote:

On Fri, 18 Sep 2020 at 07:55, Sasha Levin sashal@kernel.org wrote:

...

From: Raviteja Narayanam raviteja.narayanam@xilinx.com

[ Upstream commit 42e11948ddf68b9f799cad8c0ddeab0a39da33e8 ]

On some platforms, the log is corrupted while console is being registered. It is observed that when set_termios is called, there are still some bytes in the FIFO to be transmitted.

So, wait for tx_empty inside cdns_uart_console_setup before calling set_termios.

Signed-off-by: Raviteja Narayanam raviteja.narayanam@xilinx.com Reviewed-by: Shubhrajyoti Datta shubhrajyoti.datta@xilinx.com Link: https://lore.kernel.org/r/1586413563-29125-2-git-send-email-raviteja.narayan... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org

stable rc 4.9 arm64 build broken.

and stable rc 4.9 arm build broken.

drivers/tty/serial/xilinx_uartps.c: In function 'cdns_uart_console_setup': drivers/tty/serial/xilinx_uartps.c:1286:40: error: 'TX_TIMEOUT' undeclared (first use in this function); did you mean 'ETIMEDOUT'? time_out = jiffies + usecs_to_jiffies(TX_TIMEOUT); ^~~~~~~~~~ ETIMEDOUT drivers/tty/serial/xilinx_uartps.c:1286:40: note: each undeclared identifier is reported only once for each function it appears in CC drivers/usb/core/port.o scripts/Makefile.build:304: recipe for target 'drivers/tty/serial/xilinx_uartps.o' failed make[5]: *** [drivers/tty/serial/xilinx_uartps.o] Error 1

Reported-by: Naresh Kamboju naresh.kamboju@linaro.org

full test log link, https://ci.linaro.org/view/lkft/job/openembedded-lkft-linux-stable-rc-4.9/DI...

...

---

drivers/tty/serial/xilinx_uartps.c | 8 ++++++++ 1 file changed, 8 insertions(+)

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index eb61a07fcbbc3..07ea71a611678 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -1268,6 +1268,7 @@ static int cdns_uart_console_setup(struct console *co, char *options) int bits = 8; int parity = 'n'; int flow = 'n';

•   unsigned long time_out;
  
    if (co->index < 0 || co->index >= CDNS_UART_NR_PORTS)
            return -EINVAL;
  

@@ -1281,6 +1282,13 @@ static int cdns_uart_console_setup(struct console *co, char *options) if (options) uart_parse_options(options, &baud, &parity, &bits, &flow);

•   /* Wait for tx_empty before setting up the console */
  

•   time_out = jiffies + usecs_to_jiffies(TX_TIMEOUT);
  

•   while (time_before(jiffies, time_out) &&
  

•          cdns_uart_tx_empty(port) != TIOCSER_TEMT)
  

•           cpu_relax();
  

•   return uart_set_options(port, co, baud, parity, bits, flow);
  

}

-- 2.25.1

-- Linaro LKFT https://lkft.linaro.org