linux-kernel - Re: [PATCH 05/11] media: renesas: fdp1: remove R-Car H3 ES1.* handling

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Date:   Mon, 24 Apr 2023 19:37:53 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     linux-renesas-soc@...r.kernel.org,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Subject: Re: [PATCH 05/11] media: renesas: fdp1: remove R-Car H3 ES1.* handling

Hi Wolfram,

On Tue, Mar 7, 2023 at 5:31 PM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
> R-Car H3 ES1.* was only available to an internal development group and
> needed a lot of quirks and workarounds. These become a maintenance
> burden now, so our development group decided to remove upstream support
> and disable booting for this SoC. Public users only have ES2 onwards.
>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Thanks for your patch, which is now commit af4273b43f2bd9ee ("media:
renesas: fdp1: remove R-Car H3 ES1.* handling") in media/master
(next-20230417 and later).

> --- a/drivers/media/platform/renesas/rcar_fdp1.c
> +++ b/drivers/media/platform/renesas/rcar_fdp1.c
> @@ -254,7 +254,6 @@ MODULE_PARM_DESC(debug, "activate debug info");
>
>  /* Internal Data (HW Version) */
>  #define FD1_IP_INTDATA                 0x0800
> -#define FD1_IP_H3_ES1                  0x02010101
>  #define FD1_IP_M3W                     0x02010202
>  #define FD1_IP_H3                      0x02010203
>  #define FD1_IP_M3N                     0x02010204
> @@ -2359,9 +2358,6 @@ static int fdp1_probe(struct platform_device *pdev)
>
>         hw_version = fdp1_read(fdp1, FD1_IP_INTDATA);
>         switch (hw_version) {
> -       case FD1_IP_H3_ES1:
> -               dprintk(fdp1, "FDP1 Version R-Car H3 ES1\n");
> -               break;
>         case FD1_IP_M3W:
>                 dprintk(fdp1, "FDP1 Version R-Car M3-W\n");
>                 break;

Apparently 0x02010101 is also used on (at least) R-Car M2-W ES1.0,
causing the following annoying (but further harmless?) messages
during boot:

    rcar_fdp1 fe940000.fdp1: FDP1 Unidentifiable (0x02010101)
    rcar_fdp1 fe944000.fdp1: FDP1 Unidentifiable (0x02010101)

Note that the R-Car Gen2 documentation states the register's contents
are all zeroes.  But that value would trigger the error message, too.

Sorry for not noticing before. Apparently I never booted a kernel
with this patch on koelsch...

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