Re: [PATCH v3 10/10] arm64: dts: renesas: gray-hawk-single: Add DisplayPort support

Geert Uytterhoeven
2024-12-16T13:33:35Z

Hi Tomi,

On Fri, Dec 6, 2024 at 10:33 AM Tomi Valkeinen
<tomi.valkeinen@ideasonboard.com> wrote:
> From: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
>
> Add support for the mini DP output on the Gray Hawk board.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>

Thanks for your patch, which is now commit b1000645dc29701f
("arm64: dts: renesas: gray-hawk-single: Add DisplayPort support")
in renesas-devel/renesas-dts-for-v6.14.

Apparently this patch breaks s2idle on Gray Hawk Single when "[PATCH
v3 06/10] drm/rcar-du: dsi: Add r8a779h0 support" is not present, or
when CONFIG_DRM_RCAR_USE_MIPI_DSI is not enabled. If the DSI driver
is not available, the ti_sn65dsi86.bridge part fails to probe with
-EPROBE_DEFER and "failed to attach dsi host". Still, the sn65dsi86
driver must do something critical, as resuming from s2idle now hangs.
I haven't identified yet where exactly it hangs.

As a result, s2idle is broken in current renesas-devel, which only
has the DTS changes. Perhaps I should drop the DTS until the issue
is resolved?

However, I suspect White Hawk has the same issue (if
CONFIG_DRM_RCAR_USE_MIPI_DSI=n), but I cannot verify as my local White
Hawk is currently not available for kernel testing.

Do you have a clue?
Thanks!

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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