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 10:43:00 +0000
From:   Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
To:     Schrempf Frieder <frieder.schrempf@...tron.De>,
        "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 Frieder,

[..]
> >
> > Ok, I will have a look at what could make the chip selection fail in
> > case of AHB read.
> 
> Could you try with this change applied:
> 
> @@ -503,7 +503,7 @@ static void fsl_qspi_select_mem(struct fsl_qspi *q, struct
> spi_device *spi)
>                          map_addr = q->memmap_phy;
>                  else
>                          map_addr = q->memmap_phy +
> -                                  2 * q->devtype_data->ahb_buf_size;
> +                                  q->devtype_data->ahb_buf_size;
> 
>                  qspi_writel(q, map_addr, q->iobase + QUADSPI_SFA1AD +
> (i * 4));
>          }
> 

I have tried above change and also have done few more changes but still AHB read for CS1 is falling.

I guess we need to implement dynamic memory mapping [1] for AHB Read as was being done in previous driver implementation.
Would try this and update you.

[1] https://patchwork.ozlabs.org/patch/503655/

--
Regards
Yogesh Gaur
[..]