[U-Boot] [PATCH] serial: stm32: Automatically generate CR when LF is observed

[Kunhua Huang <huangkunhua@gmail.com>]

On Tue, May 12, 2015 at 05:56:36PM -0400, Tom Rini wrote:
> On Tue, May 12, 2015 at 10:35:55PM +0200, Kamil Lulko wrote:
>
> > Strange, this was already posted by Kunhua Huang - then reverted in
> > commit 698a12bef9e782dcd99c555a739c16eec8669f14. Anyway, yes this
> > carriage return should be added there. I simply forgot it since I had
> > implicit CR for each LF turned on in my terminal. Never thought this
> > would cause so much havoc for users ;)
>
> I reverted it since the author said it wasn't needed with the other
> patch they did being applied.  Daniel, can you confirm the odd behavior
> exists with top of tree? Thanks!
>
> --
> Tom

Sorry about my wrong expression.

In these two patch "[U-Boot] [PATCH v2] stm32f4: fix serial output"
and "[U-Boot] [PATCH v2] stm32f4: add serial print port"
, there are same and similar code as below.


In "[U-Boot] [PATCH v2] stm32f4: fix serial output" :

	struct stm32_serial *usart = (struct stm32_serial *)USART_BASE;
	+
	+	if (c == '\n')
	+		stm32_serial_putc('\r');
	+
	while ((readl(&usart->sr) & USART_SR_FLAG_TXE) == 0)
			;
	writel(c, &usart->dr);

In "[U-Boot] [PATCH v2] stm32f4: add serial print port" :

	-	struct stm32_serial *usart = (struct stm32_serial *)USART_BASE;
	+	struct stm32_serial *usart =
	+		(struct stm32_serial *)usart_base[USART_PORT];
	+
	+	if (c == '\n')
	+		stm32_serial_putc('\r');
	+
		while ((readl(&usart->sr) & USART_SR_FLAG_TXE) == 0)
				;
		writel(c, &usart->dr);

If these "two patch" patch at the same time, it may happened
conflict.

I have reply the mail in "[U-Boot] [U-Boot,v2] stm32f4: add serial print
port" as below,
>Sorry about the mistake of this patch.
>This patch has already include "[PATCH v2] stm32f4: fix serial output".
>If adopt this patch, patch "[PATCH v2] stm32f4: fix serial output" need
>to be discarded.

This means that "add serial print port" has already include
"stm32f4: fix serial output".
So, if patch "add serial print port", then patch "stm32f4: fix serial output"
should not be patch.

But patch these "two patch" and then revert it. It will cause the code
disappear.

Thanks to Daniel Thompson.