linux-kernel - Re: [PATCH v3 4/4] can: flexcan: add vf610 support for FlexCAN

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Date:	Wed, 16 Jul 2014 08:43:22 +0200
From:	Stefan Agner <stefan@...er.ch>
To:	Marc Kleine-Budde <mkl@...gutronix.de>
Cc:	shawn.guo@...escale.com, kernel@...gutronix.de,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/4] can: flexcan: add vf610 support for FlexCAN

Am 2014-07-15 16:24, schrieb Marc Kleine-Budde:
<snip>
>> @@ -150,18 +171,20 @@
>>   * FLEXCAN hardware feature flags
>>   *
>>   * Below is some version info we got:
>> - *    SOC   Version   IP-Version  Glitch-  [TR]WRN_INT
>> - *                                Filter?   connected?
>> - *   MX25  FlexCAN2  03.00.00.00     no         no
>> - *   MX28  FlexCAN2  03.00.04.00    yes        yes
>> - *   MX35  FlexCAN2  03.00.00.00     no         no
>> - *   MX53  FlexCAN2  03.00.00.00    yes         no
>> - *   MX6s  FlexCAN3  10.00.12.00    yes        yes
>> + *    SOC   Version   IP-Version  Glitch-  [TR]WRN_INT  Memory err
>> + *                                Filter?   connected?  detection
>> + *   MX25  FlexCAN2  03.00.00.00     no         no         no
>> + *   MX28  FlexCAN2  03.00.04.00    yes        yes         no
>> + *   MX35  FlexCAN2  03.00.00.00     no         no         no
>> + *   MX53  FlexCAN2  03.00.00.00    yes         no         no
>> + *   MX6s  FlexCAN3  10.00.12.00    yes        yes         no
>> + *   VF610 FlexCAN3  ?               no         no        yes
>                                         ^^         ^^
> 
> Can you check the datasheet if the flexcan core has a "Glitch Filter
> Width Register (FLEXCANx_GFWR)"


There is no such register called GFWR/Glitch Filter or similar.

> Can you check if the core generates a warning interrupt with the current
> setup, if you don't switch on bus error reporting? This means internally
> the [TR]WRN_INT is connected and works as specified.

Ok, so I disabled TWRNMSK (Bit 11) in the control register and printed
out the error and status register (ESR1), this is what I get:
[  191.285295] flexcan_irq, esr=00040080
[  191.288996] flexcan_irq, ctrl=17092051

Bit 17 (TWRNINT) is not set while TWRNMSK is disabled. Hence [TR]WRN_INT
is not connected?


--
Stefan
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