lkml.org 
[lkml]   [2019]   [May]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: [EXT] Re: [PATCH 3/4] mtd: spinand: Enabled support to detect parameter page
Date
Hi Miquel,

> > >
> > > > Some of the SPI NAND devices has parameter page which is similar to
> ONFI
> > > > table.
> > > >
> > > > But, it may not be self sufficient to propagate all the required
> > > > parameters. Fixup function has been added in struct manufacturer to
> > > > accommodate this.
> > > >
> > > > Signed-off-by: Shivamurthy Shastri <sshivamurthy@micron.com>
> > > > ---
> > > > drivers/mtd/nand/spi/core.c | 113
> > > +++++++++++++++++++++++++++++++++++-
> > > > include/linux/mtd/spinand.h | 5 ++
> > > > 2 files changed, 117 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
> > > > index 985ad52cdaa7..40882a1d2bc1 100644
> > > > --- a/drivers/mtd/nand/spi/core.c
> > > > +++ b/drivers/mtd/nand/spi/core.c
> > > > @@ -574,6 +574,108 @@ static int spinand_lock_block(struct
> > > spinand_device *spinand, u8 lock)
> > > > return spinand_write_reg_op(spinand, REG_BLOCK_LOCK, lock);
> > > > }
> > > >
> > > > +/**
> > > > + * spinand_read_param_page_op - Read parameter page operation
> > > > + * @spinand: the spinand device
> > > > + * @page: page number where parameter page tables can be found
> > > > + * @parameters: buffer used to store the parameter page
> > >
> > > Does not match the prototype
> >
> > I will fix this in next version.
> >
> > >
> > > > + * @len: length of the buffer
> > > > + *
> > > > + * Read parameter page
> > > > + *
> > > > + * Returns 0 on success, a negative error code otherwise.
> > > > + */
> > > > +static int spinand_parameter_page_read(struct nand_device *base,
> > >
> > > Please use a spinand structure as parameter, you don't need a
> > > nand_device here (same for other spinand functions).
> >
> > This function is helper function for generic ONFI layer.
> > From generic ONFI layer, I can get only nand_device.
>
> How do you handle if the SPI NAND core is not compiled-in?
>

Both raw NAND and SPI NAND define parameter_page_read function,
which will be called in nand_onfi_detect.

Rightly you pointed, I will add the following lines in nand_onfi_detect
to tackle if those functions are not compiled-in.

/* return 0, if ONFI helper functions are not defined */
if (!base->helper.parameter_page_read &&
!base->helper.check_revision &&
!base->helper.init_intf_data)
return 0;

I hope this answers your point.

Thanks,
Shiva
\
 
 \ /
  Last update: 2019-05-28 17:47    [W:0.282 / U:0.920 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site