Re: [PATCH v2 2/3] driver core: fw_devlink: Improve detection of overlapping cycles

[Saravana Kannan]

On Mon, Feb 19, 2024 at 2:59 AM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
>
> Hi Saravana,
>
> On Fri, Feb 2, 2024 at 10:57 AM Saravana Kannan <saravanak@googlecom> wrote:
> > fw_devlink can detect most overlapping/intersecting cycles. However it was
> > missing a few corner cases because of an incorrect optimization logic that
> > tries to avoid repeating cycle detection for devices that are already
> > marked as part of a cycle.
>
> Nice (I assume it's due to this patch ;-), with v6.8-rc5 I see much fewer
> dependency cycle messages.

Thanks!

It's not due to this patch. It's due to this other series:
https://lore.kernel.org/lkml/20240207011803.2637531-1-saravanak@xxxxxxxxxx/

I forget why the cycle warning doesn't show up between fea80000.csi2
and video@e6ef7000, but I had the same improvement on my test device
and there was a valid reason why it doesn't show up. So, an
unintentional, but non-buggy benefit of that series.

-Saravana

>
> E.g. on Salvator-XS:
>
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@e6ef7000/ports/port@1/endpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@e6ef6000/ports/port@1/endpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@e6ef5000/ports/port@1/endpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@e6ef4000/ports/port@1/endpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@e6ef3000/ports/port@1/endpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@e6ef2000/ports/port@1/endpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@e6ef1000/ports/port@1/endpoint@0
> -platform fea80000.csi2: Fixed dependency cycle(s) with
> /soc/video@e6ef0000/ports/port@1/endpoint@0
> -platform feaa0000.csi2: Fixed dependency cycle(s) with
> /soc/video@e6ef3000/ports/port@1/endpoint@2
> -platform feaa0000.csi2: Fixed dependency cycle(s) with
> /soc/video@e6ef2000/ports/port@1/endpoint@2
> -platform feaa0000.csi2: Fixed dependency cycle(s) with
> /soc/video@e6ef1000/ports/port@1/endpoint@2
> -platform feaa0000.csi2: Fixed dependency cycle(s) with
> /soc/video@e6ef0000/ports/port@1/endpoint@2
> -platform fead0000.hdmi: Fixed dependency cycle(s) with
> /soc/sound@ec500000/ports/port@1/endpoint
> -platform feae0000.hdmi: Fixed dependency cycle(s) with
> /soc/sound@ec500000/ports/port@2/endpoint
> -platform feb00000.display: Fixed dependency cycle(s) with
> /soc/hdmi@feae0000/ports/port@0/endpoint
> -platform feb00000.display: Fixed dependency cycle(s) with
> /soc/hdmi@fead0000/ports/port@0/endpoint
> -platform hdmi0-out: Fixed dependency cycle(s) with
> /soc/hdmi@fead0000/ports/port@1/endpoint
> -platform hdmi1-out: Fixed dependency cycle(s) with
> /soc/hdmi@feae0000/ports/port@1/endpoint
> -platform vga-encoder: Fixed dependency cycle(s) with /vga/port/endpoint
> -platform vga-encoder: Fixed dependency cycle(s) with
> /soc/display@feb00000/ports/port@0/endpoint
>
> -i2c 2-0010: Fixed dependency cycle(s) with
> /soc/sound@ec500000/ports/port@0/endpoint
> -i2c 2-0010: Fixed dependency cycle(s) with /soc/sound@ec500000
>
> -i2c 4-0070: Fixed dependency cycle(s) with
> /soc/csi2@fea80000/ports/port@0/endpoint
> -i2c 4-0070: Fixed dependency cycle(s) with
> /soc/csi2@feaa0000/ports/port@0/endpoint
> -i2c 4-0070: Fixed dependency cycle(s) with /hdmi-in/port/endpoint
> -i2c 4-0070: Fixed dependency cycle(s) with /cvbs-in/port/endpoint
>
> FTR, the only remaining ones (on Salvator-XS) are:
>
>     platform soc: Fixed dependency cycle(s) with
> /soc/interrupt-controller@f1010000
>     platform e6060000.pinctrl: Fixed dependency cycle(s) with
> /soc/pinctrl@e6060000/scif_clk
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
>
> 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