linux-kernel - Re: [RFC PATCH] memory: renesas-rpc-if: Correct QSPI data transfer in Manual mode

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Date:   Tue, 8 Mar 2022 10:01:36 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        "Lad, Prabhakar" <prabhakar.mahadev-lad.rj@...renesas.com>,
        Andrew Gabbasov <andrew_gabbasov@...tor.com>
Subject: Re: [RFC PATCH] memory: renesas-rpc-if: Correct QSPI data transfer in
 Manual mode

Hi Wolfram,

On Tue, Mar 8, 2022 at 9:46 AM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
> > This is not QSPI, but HF.
>
> Ah, okay.
>
> > Building a new firmware for R-Car H3 ES1.0 with HF unlocked will be
> > complicated, as it is not supported by upstream TF-A.
>
> You mean QSPI here?

No, HF. Salvator-X(S) boots from HF.

> > Note that HF also fails to probe on R-Car M3-W and M3-N ES1.0.
>
> Do you have this patch form Andrew in your tree:
>
> [PATCH] memory: renesas-rpc-if: Avoid unaligned bus access for HyperFlash

Sure I have it. It's in v5.16 ;-)

> Even if so, I don't think that reverting patches is the solution. As you

Sure, a plain revert is definitely not the right solution.

> could see from Andrew's patch, HyperFlash was also broken before and it
> just may need more fixes for Gen3 perhaps? IIRC my patches didn't break
> Andrew's tests but maybe we should ask him again. Maybe Andrew has also
> some more ideas, I only did QSPI.

My understanding from reading the threads is that Andrew's patch and
yours arrived in parallel, and are believed to fix two different and
non-intersecting things (QSPI vs. HF).  I also found no explicit mention
that Andrew tried your patch.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds