linux-kernel - Re: [PATCH 2/6] net: can: xilinx_can: Fix flags field initialization for axi can and canps

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Date:   Wed, 9 Oct 2019 09:17:49 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Appana Durga Kedareswara Rao <appanad@...inx.com>,
        Anssi Hannula <anssi.hannula@...wise.fi>
Cc:     "wg@...ndegger.com" <wg@...ndegger.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Michal Simek <michals@...inx.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>
Subject: Re: [PATCH 2/6] net: can: xilinx_can: Fix flags field initialization
 for axi can and canps

On 10/9/19 6:01 AM, Appana Durga Kedareswara Rao wrote:
> Hi,
> 
> <Snip>
>> On 18.3.2019 13.32, Appana Durga Kedareswara rao wrote:
>>> AXI CAN IP and CANPS IP supports tx fifo empty feature, this patch
>>> updates the flags field for the same.
>>>
>>> Signed-off-by: Appana Durga Kedareswara rao
>>> <appana.durga.rao@...inx.com>
>>> ---
>>>  drivers/net/can/xilinx_can.c | 2 ++
>>>  1 file changed, 2 insertions(+)
>>>
>>> diff --git a/drivers/net/can/xilinx_can.c
>>> b/drivers/net/can/xilinx_can.c index 2de51ac..22569ef 100644
>>> --- a/drivers/net/can/xilinx_can.c
>>> +++ b/drivers/net/can/xilinx_can.c
>>> @@ -1428,6 +1428,7 @@ static const struct dev_pm_ops xcan_dev_pm_ops
>> =
>>> {  };
>>>
>>>  static const struct xcan_devtype_data xcan_zynq_data = {
>>> +	.flags = XCAN_FLAG_TXFEMP,
>>>  	.bittiming_const = &xcan_bittiming_const,
>>>  	.btr_ts2_shift = XCAN_BTR_TS2_SHIFT,
>>>  	.btr_sjw_shift = XCAN_BTR_SJW_SHIFT,
>>
>> Thanks for catching this, this line seemed to have been incorrectly removed by
>> my 9e5f1b273e ("can: xilinx_can: add support for Xilinx CAN FD core").
>>
>> But:
>>
>>> @@ -1435,6 +1436,7 @@ static const struct xcan_devtype_data
>>> xcan_zynq_data = {  };
>>>
>>>  static const struct xcan_devtype_data xcan_axi_data = {
>>> +	.flags = XCAN_FLAG_TXFEMP,
>>>  	.bittiming_const = &xcan_bittiming_const,
>>>  	.btr_ts2_shift = XCAN_BTR_TS2_SHIFT,
>>>  	.btr_sjw_shift = XCAN_BTR_SJW_SHIFT,
>>
>>
>> Are you sure this is right?
>> In the documentation [1] there does not seem to be any TXFEMP interrupt, it
>> would be interrupt bit 14 but AXI CAN 5.0 seems to only go up to 11.
>>
>> Or maybe it is undocumented or there is a newer version somewhere?
> 
> Sorry for the delay in the reply. 
> Agree TXFEMP interrupt feature is not supported by the Soft IP CAN.
> Since this patch already got applied will send a separate patch to fix this.

Please base your patch on net/master and add the appropriate fixes tag:

Fixes: 3281b380ec9f ("can: xilinx_can: Fix flags field initialization for axi can and canps")

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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