Re: [PATCH v2 00/10] i2c: xiic: Add features, bug fixes.

From: Marek Vasut <marex@denx.de>
To: Raviteja Narayanam <rna@xilinx.com>,
	Michal Simek <michals@xilinx.com>,
	"linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>
Cc: "linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	git <git@xilinx.com>, "joe@perches.com" <joe@perches.com>
Subject: Re: [PATCH v2 00/10] i2c: xiic: Add features, bug fixes.
Date: Wed, 28 Jul 2021 20:47:26 +0200	[thread overview]
Message-ID: <d70b569d-a0e3-81b0-a553-ed88423924f7@denx.de> (raw)
In-Reply-To: <SN6PR02MB4093ACD6E6A349BA9740ABB9CAEA9@SN6PR02MB4093.namprd02.prod.outlook.com>

On 7/28/21 12:11 PM, Raviteja Narayanam wrote:
[...]

>>>>>>> I have tested this again on our boards with eeprom and other
>>>>>>> sensors, this
>>>>>> is working fine for us.
>>>>>>
>>>>>> Can you share details of how those tests were performed ?
>>>>>
>>>>> Stress test - 1:
>>>>> Heavy ethernet traffic running in the background.
>>>>> I2c commands script (like below) running. We can see visible stutter
>>>>> in the
>>>> output as expected, but nothing failed.
>>>>>
>>>>> i=0
>>>>> while [ 1 ]
>>>>> do
>>>>> 		i2ctransfer -y -f 2 w1@0X54 0X00 r31@0X54
>>>>> 		i2ctransfer -y -f 2 w1@0X54 0X00 r32@0X54
>>>>> 		i2ctransfer -y -f 2 w1@0X54 0X00 r255@0X54
>>>>> 		i2ctransfer -y -f 2 w1@0X54 0X00 r273@0X54
>>>>>                                 i2ctransfer -y -f 2 w1@0X54 0X00
>>>>> r1@0X54
>>>>
>>>> Could it be that you never see the problem because you always talk to
>>>> one single device ?
>>>
>>> There are transfers to other devices as well.
>>
>> The above test only accesses device at address 0x54, right ?
> 
> Above code is just one part.
> We are doing read/writes to all devices present on this board https://www.xilinx.com/support/documentation/boards_and_kits/zcu102/ug1182-zcu102-eval-bd.pdf

Can you share details of how those tests were performed ?

>>> Our board has multiple power monitors, eeprom and other misc devices
>>> that are accessed through the same driver and are working fine.
>>
>> That does not seem to be what the test above does .
>>
>>>> Do you also test writes which are not 1 byte long ?
>>>>
>>>
>>> Yes, like for eeprom 1 page (16 bytes)  is written.
>>
>> I suspect the atmel mxt does much longer writes, try 255 bytes or so.
> 
> Ok, I will do longer writes (in the range of 255) on supported slave devices.

Thank you