linux-kernel - Re: [PATCH v5 3/9] spi: Add a driver for the Freescale/NXP QuadSPI controller

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Date:   Fri, 16 Nov 2018 10:10:32 +0000
From:   Schrempf Frieder <frieder.schrempf@...tron.De>
To:     Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
CC:     Boris Brezillon <boris.brezillon@...tlin.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Mark Brown <broonie@...nel.org>, Han Xu <han.xu@....com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "richard@....at" <richard@....at>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        David Wolfe <david.wolfe@....com>,
        Fabio Estevam <fabio.estevam@....com>,
        Prabhakar Kushwaha <prabhakar.kushwaha@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 3/9] spi: Add a driver for the Freescale/NXP QuadSPI
 controller

On 16.11.18 10:46, Yogesh Narayan Gaur wrote:
> Hi Frieder,
> 
>> -----Original Message-----
>> From: Schrempf Frieder [mailto:frieder.schrempf@...tron.De]
>> Sent: Friday, November 16, 2018 3:12 PM
>> To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
>> Cc: Boris Brezillon <boris.brezillon@...tlin.com>; linux-mtd@...ts.infradead.org;
>> linux-spi@...r.kernel.org; Marek Vasut <marek.vasut@...il.com>; Mark
>> Brown <broonie@...nel.org>; Han Xu <han.xu@....com>;
>> dwmw2@...radead.org; computersforpeace@...il.com; richard@....at;
>> miquel.raynal@...tlin.com; David Wolfe <david.wolfe@....com>; Fabio
>> Estevam <fabio.estevam@....com>; Prabhakar Kushwaha
>> <prabhakar.kushwaha@....com>; shawnguo@...nel.org; linux-
>> kernel@...r.kernel.org
>> Subject: Re: [PATCH v5 3/9] spi: Add a driver for the Freescale/NXP QuadSPI
>> controller
>>
>> Hi Yogesh,
>>
>> On 16.11.18 06:41, Yogesh Narayan Gaur wrote:
>>> Hi Frieder,
>>>
>>>> -----Original Message-----
>>>> From: Schrempf Frieder [mailto:frieder.schrempf@...tron.De]
>>>> Sent: Thursday, November 15, 2018 7:32 PM
>>>> To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
>>>> Cc: Boris Brezillon <boris.brezillon@...tlin.com>;
>>>> linux-mtd@...ts.infradead.org; linux-spi@...r.kernel.org; Marek Vasut
>>>> <marek.vasut@...il.com>; Mark Brown <broonie@...nel.org>; Han Xu
>>>> <han.xu@....com>; dwmw2@...radead.org;
>> computersforpeace@...il.com;
>>>> richard@....at; miquel.raynal@...tlin.com; David Wolfe
>>>> <david.wolfe@....com>; Fabio Estevam <fabio.estevam@....com>;
>>>> Prabhakar Kushwaha <prabhakar.kushwaha@....com>;
>> shawnguo@...nel.org;
>>>> linux- kernel@...r.kernel.org
>>>> Subject: Re: [PATCH v5 3/9] spi: Add a driver for the Freescale/NXP
>>>> QuadSPI controller
>>>>
>>>> Hi Yogesh,
>>>>
>>>> On 15.11.18 14:12, Boris Brezillon wrote:
>>>>> On Thu, 15 Nov 2018 11:43:05 +0000
>>>>> Schrempf Frieder <frieder.schrempf@...tron.De> wrote:
>>>>>
>>>>>> On 15.11.18 07:22, Yogesh Narayan Gaur wrote:
>>>>>>> Hi Frieder,
>>>>>>>
>>>>>>> With below patch on top of your v5, Read/Write/Erase on CS1 is
>>>>>>> working
>>>> fine for me.
>>>>>>
>>>>>> Ok, are you sure, that AHB read is working too with this patch?
>>>>>> You are removing the memmap_phy offset from SFAR and the SFXXAD
>>>>>> register values.
>>>>>>
>>>>>> I can understand that selection of the CS and IP commands will work
>>>>>> like this, but I can't understand how AHB read should work without
>>>>>> the base address of the mapped memory.
>>>>>>
>>>>>> I'm afraid I still don't fully understand the background of these
>>>>>> things,
>>>>>
>>>>> Same here. Yogesh, can you give us more detail on why you decided to
>>>>> drop the memmap_phy offset?
>>>>
>>>> Your changes do not work on my setup (i.MX6UL). It looks like your
>>>> hardware is different.
>>>>
>>>> I found this patch for LS2080A: [1]. This would explain why you need
>>>> to remove the offset to make it work.
>>>>
>>>> To verify this, could you please test your setup with the current
>>>> spi-nor driver (fsl_quadspi.c). If our assumptions are right, it
>>>> should only work on CS0 and CS1 with [1] applied.
>>>>
>>>
>>> Yes, I need to remove the offset to make it work and this is required for the
>> NXP Layerscape-2.x SoCs like LS208x/Ls108x etc.
>>>
>>> I have modified the patch and have introduced entry in quirks for ls2080a. With
>> this Read/Write/Erase are working for me for both CS.
>>
>> Ok, what I was asking for is a test with the original, unmodified SPI NOR driver in
>> mtd/spi-nor/fsl-quadspi.c. We need this to confirm that the problem is really
>> what we think, or to find out if we missed something.
>>
>> Can you please do a quick test? If it confirms our assumptions, I will send a new
>> version with the quirk and hopefully we can then move on.
>>
> 
> Yes, problem exist with original un-modified upstread SPI-NOR driver also.
> Actually, internally we are maintaining driver with some local change and one of the change is related to same i.e. making having map_addr as 0 for layerscape chips.
> 
> I have tested, that by removing that CS1 access shows error.

Ok, thank you for clarifying this!

> 
> Please integrate these changes in your next version.

Ok.

Thanks,
Frieder