On Tue, Nov 26, 2019 at 5:23 PM Marek Vasut <ma...@denx.de> wrote:
>
> On 11/26/19 3:47 AM, Masahiro Yamada wrote:
> > On Thu, Nov 21, 2019 at 6:38 AM Marek Vasut wrote:
> >>
> >> Legacy kernel versions for SoCFPGA may not implement proper reset
> >> handling.
> >
> > What is "legacy kernel versions" ?
>
> Anything older than 5.x , which got proper reset handling, finally.
Really?
Could you tell the commit ID?
>
> >> Apply the same approach as SoCFPGA reset driver, check
> >> environment variable "socfpga_legacy_reset_compat", and if it is
> >> set, do not reset the IP before booting Linux. This way, even the
> >> older kernel versions can be booted by up to date U-Boot.
> >>
> >> Signed-off-by: Marek Vasut <ma...@denx.de>
> >> Cc: Masahiro Yamada <yamada.masah...@socionext.com>
> >> ---
> >> drivers/mtd/nand/raw/denali_dt.c | 12 ++++++++++++
> >> 1 file changed, 12 insertions(+)
> >>
> >> diff --git a/drivers/mtd/nand/raw/denali_dt.c
> >> b/drivers/mtd/nand/raw/denali_dt.c
> >> index 2c9e249ab6..d35f2a3543 100644
> >> --- a/drivers/mtd/nand/raw/denali_dt.c
> >> +++ b/drivers/mtd/nand/raw/denali_dt.c
> >> @@ -148,6 +148,18 @@ static int denali_dt_remove(struct udevice *dev)
> >> {
> >> struct denali_nand_info *denali = dev_get_priv(dev);
> >>
> >> +#if CONFIG_IS_ENABLED(ARCH_SOCFPGA)
> >> + /*
> >> + * Legacy kernel versions do not implement proper reset handling on
> >> + * SoCFPGA. To let those older kernel versions work, reuse the same
> >> + * approach as the SoCFPGA reset driver does -- check environment
> >> + * variable socfpga_legacy_reset_compat and avoid resetting the IP
> >> + * before booting the kernel if it is set to 1.
> >> + */
> >> + if (env_get_ulong("socfpga_legacy_reset_compat", 10, 0))
> >> + return 0;
> >> +#endif
> >> +
> >
> >
> > How about removing denali_dt_remove() entirely ?
>
> Fine by me.
>
> > Not only SOCFPGA, but also my boards are broken.
>
> How come ?
Because the Linux kernel version I am using
does not have the reset handling for the Denali driver.
>
> > I am really annoyed since the following commit:
> >
> >
> >
> >
> > commit ed784ac3822b7d7019679a41a17907296e2dadbe
> > Author: Simon Goldschmidt <simon.k.r.goldschm...@gmail.com>
> > AuthorDate: Fri Mar 1 20:12:34 2019 +0100
> > Commit: Marek Vasut <ma...@denx.de>
> > CommitDate: Wed Apr 17 22:20:16 2019 +0200
> >
> > mtd: rawnand: denali: add reset handling
> >
> > This adds reset handling to the devicetree-enabled Denali NAND driver.
> >
> > For backwards compatibility, only a warning is printed when failing to
> > get reset handles.
> >
> > Signed-off-by: Simon Goldschmidt <simon.k.r.goldschm...@gmail.com>
> >
> >
> >
> >> return reset_release_bulk(&denali->resets);
> >> }
>
> CCing Simon.
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--
Best Regards
Masahiro Yamada
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