linux-kernel - RE: [PATCH 03/11] spi: Add a driver for the Freescale/NXP QuadSPI controller

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Date:   Fri, 15 Jun 2018 13:42:12 +0000
From:   Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
CC:     "richard@....at" <richard@....at>,
        Prabhakar Kushwaha <prabhakar.kushwaha@....com>,
        Han Xu <han.xu@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        Frieder Schrempf <frieder.schrempf@...eet.de>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        Fabio Estevam <fabio.estevam@....com>,
        David Wolfe <david.wolfe@....com>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>
Subject: RE: [PATCH 03/11] spi: Add a driver for the Freescale/NXP QuadSPI
 controller

Hi Boris,

I am still debugging the issue.
With some analysis, able to check that proper values are not being written for QUADSPI_SFA2AD/ QUADSPI_SFB1AD/ QUADSPI_SFB2AD register.

In current code, value of map_addr are being assigned to these register.
             map_addr = q->memmap_phy +
                        2 * q->devtype_data->ahb_buf_size;

     qspi_writel(q, map_addr, q->iobase + QUADSPI_SFA1AD + (i * 4));

But instead of "q->devtype_data->ahb_buf_size" it should be flash size. 
For my case flash size is 0x4000000 and with this hard coded value I am able to perform Write and Erase operation.
One more change, I have to do is adding the flash_size when writing the base_address in SFAR register for case when "mem->spi->chip_select == 1"
	qspi_writel(q, q->memmap_phy + 0x4000000, base + QUADSPI_SFAR);

Thus, there should be mechanism or the entry in structure where we can have the information of the size of the connected slave device.

With both of above hardcoded changes, I am able to perform Write and Erase operation on my second flash device but still facing issue in Read operation, debugging in progress for that.

--
Regards
Yogesh Gaur


-----Original Message-----
From: Boris Brezillon [mailto:boris.brezillon@...tlin.com] 
Sent: Friday, June 15, 2018 6:20 PM
To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
Cc: richard@....at; Prabhakar Kushwaha <prabhakar.kushwaha@....com>; Han Xu <han.xu@....com>; linux-kernel@...r.kernel.org; linux-spi@...r.kernel.org; marek.vasut@...il.com; Frieder Schrempf <frieder.schrempf@...eet.de>; broonie@...nel.org; linux-mtd@...ts.infradead.org; miquel.raynal@...tlin.com; Fabio Estevam <fabio.estevam@....com>; David Wolfe <david.wolfe@....com>; computersforpeace@...il.com; dwmw2@...radead.org
Subject: Re: [PATCH 03/11] spi: Add a driver for the Freescale/NXP QuadSPI controller

On Tue, 12 Jun 2018 08:51:25 +0000
Yogesh Narayan Gaur <yogeshnarayan.gaur@....com> wrote:

> 
> I am working on lsxxx platform. With further debugging, I found that my erase operation for second flash device is not working properly.
> Need to have debugging for this in Frieder Patch.

Did you find the problem? Could it be a wrong "reg = <>" definition in your DT (Frieder changed the CS numbering scheme in the new driver)?