[ts-7000] Re: Inverted polarity RTS/DTR on TS7260 kernel 2.6

["ToddV" <>]

Hi Roberto -

> For other questions, now I need to upgrade kernel to 2.6 and I got this 
> unaspected problem:
> - on /dev/ttyAM0 closed RTS and DTR are at logic level 1 (active)
> - on /dev/ttyAM0 open RTS and DTR are at logic level 0 (not active)
> 
> It seems works in inverted mode. Calling fopen() they go down and calling 
> fclose() they works!!!


Yes, the polarity of the RTS/CTS lines are incorrect as implemented in the 
kernel code for the ep93xx. These are set in the ep93xx_uart_set_mctrl() 
function in arch/arm/mach-ep93xx/core.c

Here is the patch that I apply when building my kernels:

diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index ffdf87b..5718cca 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -251,9 +251,9 @@ static void ep93xx_uart_set_mctrl(struct amba_device *dev,
        unsigned int mcr;
 
        mcr = 0;
-       if (!(mctrl & TIOCM_RTS))
+       if (mctrl & TIOCM_RTS)
                mcr |= 2;
-       if (!(mctrl & TIOCM_DTR))
+       if (mctrl & TIOCM_DTR)
                mcr |= 1;
 
        __raw_writel(mcr, base + EP93XX_UART_MCR_OFFSET);
-- 


Todd



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