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: <CAMuHMdWOMpZo0fVASyDV+XTLmh-o0ozqfF4Za_sPiydsh6LOfw@mail.gmail.com>
Date: Fri, 29 Aug 2025 11:51:53 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Biju <biju.das.au@...il.com>
Cc: Wolfram Sang <wsa+renesas@...g-engineering.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 Biju,

On Wed, 30 Jul 2025 at 18:46, Biju <biju.das.au@...il.com> wrote:
> From: Biju Das <biju.das.jz@...renesas.com>
>
> As per the RZ/{G2L,G3E} HW manual SD_BUF0 can be accessed by 16/32/64
> bits. Most of the data transfer in SD/SDIO/eMMC mode is more than 8 bytes.
> During testing it is found that, if the DMA buffer is not aligned to 128
> bit it fallback to PIO mode. In such cases, 64-bit access is much more
> efficient than the current 16-bit.

Thanks for your series!

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?

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