[External] Re: [PATCH] mtd: spi-nor: Add support for sst26vf016b

Joseph Kust joseph.kust at rockwellcollins.com
Mon Jan 6 08:33:13 PST 2020


Tudor,

On Mon, Dec 23, 2019 at 9:34 AM <Tudor.Ambarus at microchip.com> wrote:
>
> Hi, Joseph,
>
> On 12/10/19 9:49 PM, Joseph Kust wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> >
> > Hi Tudor,
> >
> > On Tue, Dec 10, 2019 at 11:10 AM <Tudor.Ambarus at microchip.com> wrote:
> >>
> >> Hi, Brandon,
> >>
> >> On 11/17/19 11:55 PM, Brandon Maier wrote:
> >>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> >>>
> >>> From: Joseph Kust <joseph.kust at rockwellcollins.com>
> >>>
> >>> Adds support for sst26vf016b, a smaller variant of the sst26vf064b.
> >>
> >> How was this tested, what controller did you use? Did you test the quad read?
> >
> > This was tested on a sama5d3 SOC using the atmel,at91rm9200-spi
> > controller.  The quad read was not tested.
> > Kernel versions tested were branched from mainline 4.14.115 and 3.14.79
> >
>
> Thanks. The commit message should specify what modes were tested and
> on which controller.
>
> >>>
> >>> Signed-off-by: Joseph Kust <joseph.kust at rockwellcollins.com>
> >>> Signed-off-by: Brandon Maier <brandon.maier at rockwellcollins.com>
> >>> ---
> >>>  drivers/mtd/spi-nor/spi-nor.c | 1 +
> >>>  1 file changed, 1 insertion(+)
> >>>
> >>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> >>> index f4afe123e9dc..500929903f61 100644
> >>> --- a/drivers/mtd/spi-nor/spi-nor.c
> >>> +++ b/drivers/mtd/spi-nor/spi-nor.c
> >>> @@ -2538,6 +2538,7 @@ static const struct flash_info spi_nor_ids[] = {
> >>>         { "sst25wf080",  INFO(0xbf2505, 0, 64 * 1024, 16, SECT_4K | SST_WRITE) },
> >>>         { "sst26wf016b", INFO(0xbf2651, 0, 64 * 1024, 32, SECT_4K |
> >>>                               SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> >>> +       { "sst26vf016b", INFO(0xbf2641, 0, 64 * 1024, 32, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
>
> The dual and quad reads will probably not work because they require
> that the IOC bit from the Configuration Register to be set to 1,
> which is not the case: the default value at power-up is 0 and we
> don't set it to one in spi-nor either.
>
> I can drop the SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ flags and apply
> your patch without these if you want.
>
> Cheers,
> ta

Yes those flags should be dropped.  We likely copied them from the
other sst26 flags and thought they were the same.  You are welcome to
drop the flags and apply the patch.  Otherwise let us know if you'd
prefer us to re-send.
Thanks,
Joseph



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