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

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Date:   Wed, 14 Nov 2018 08:50:38 +0000
From:   Schrempf Frieder <frieder.schrempf@...tron.De>
To:     Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "boris.brezillon@...tlin.com" <boris.brezillon@...tlin.com>,
        "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>
CC:     "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

Hi Yogesh,

On 14.11.18 09:39, Yogesh Narayan Gaur wrote:
> Hi Frieder,
> 
> I have tried v5 version of the patch and have observed that Read is failing for CS1.

Thanks a lot for doing the test. I really appreciate it.

> In my target 2 flash devices are connected on same bus i.e. A1 -> CS0 and A2 -> CS1.
> 
> On initial debugging, I figured that Read is failing for the AHB mode i.e. if I attempt to read data size less than rxfifo read is working fine without any issue.
> 
> For data size more than rxfifo Read out data is content of same requested address of CS0.
> 	mtd_debug read /dev/mtd1 0xf00000 0x70 read --> Data is correct
> 	mtd_debug read /dev/mtd1 0xf00000 0x100 read --> Data is in-correct and data content are of the address 0xf00000 of CS0 connected flash device.

Ok, I will have a look at what could make the chip selection fail in 
case of AHB read.

> On the setup where you have done testing, did AHB mode read is being verified for CS1?

No, I currently have only hardware with CS0 connected. So I didn't test 
with CS1.

> 
> I am doing further debugging of this issue.

Thanks,
Frieder