linux-kernel - Re: [PATCH v3 0/2] Enable 64-bit polling mode for R-Car Gen3 and RZ/G2+ family

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Message-ID: <CAMuHMdX9HjP09R2p-PS4KgHKB6UcAQB+zKqN6QYwsboxtJCkPg@mail.gmail.com>
Date: Fri, 29 Aug 2025 13:04:25 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc: Biju <biju.das.au@...il.com>, Ulf Hansson <ulf.hansson@...aro.org>, 
	Biju Das <biju.das.jz@...renesas.com>, linux-mmc@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Geert Uytterhoeven <geert+renesas@...der.be>, 
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v3 0/2] Enable 64-bit polling mode for R-Car Gen3 and
 RZ/G2+ family

Hi Wolfram,

On Fri, 29 Aug 2025 at 12:26, Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
> > I believe some of the SoCs that do not support 64-bit accesses, do
> > support 32-bit accesses. Do you think it would be worthwhile adding
> > support for that, too?
>
> We have that already? Check the context after the chunk added to
> tmio_mmc_core.c:
>
>         if (host->pdata->flags & TMIO_MMC_32BIT_DATA_PORT) {
>                 u32 data = 0;
>                 u32 *buf32 = (u32 *)buf;
>         ...

OK, thanks, then I misremembered what exactly is supported and what
is not...
But this is set only on RZ/A1, so my question should be: are there
any other SoCs where TMIO_MMC_32BIT_DATA_PORT should be set?

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