linux-kernel - Re: [PATCH v4 2/2] drm/bridge: parade-ps8640: Populate devices on aux-bus

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Message-ID: <CAD=FV=XLVf1yA_o+7wSmsybivBmcYDk96kTCOnVSx9myw4i_kQ@mail.gmail.com>
Date:   Wed, 27 Oct 2021 15:12:53 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Philip Chen <philipchen@...omium.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v4 2/2] drm/bridge: parade-ps8640: Populate devices on aux-bus

Hi,

On Tue, Oct 26, 2021 at 2:56 PM Philip Chen <philipchen@...omium.org> wrote:
>
> Conventionally, panel is listed under the root of the device tree.
> When userland asks for display mode, ps8640 bridge is responsible
> for returning EDID when ps8640_bridge_get_edid() is called.
>
> Now enable a new option of listing panel under "aux-bus" of ps8640
> bridge node in the device tree. In this case, panel driver can retrieve
> EDID by triggering AUX transactions, without ps8640_bridge_get_edid()
> calls at all.
>
> To prevent the "old" and "new" options from interfering with each
> other's logic flow, disable DRM_BRIDGE_OP_EDID when the new option
> is taken.
>
> Signed-off-by: Philip Chen <philipchen@...omium.org>
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> ---
>
> (no changes since v3)
>
> Changes in v3:
> - Fix when to call of_node_put() in ps8640_of_panel_on_aux_bus()
>
> Changes in v2:
> - Add of_node_put() calls in ps8640_of_panel_on_aux_bus()
> - Select DRM_DP_AUX_BUS for PS8640 driver in Kconfig
> - Replace _put_sync() with _put_sync_suspend() in ps8640_post_disable()

Not that it terribly matters, but I don't think the "put_sync" vs.
"put_sync_suspend" was in patch #2/2. It was in #1/2.


>  drivers/gpu/drm/bridge/Kconfig         |  1 +
>  drivers/gpu/drm/bridge/parade-ps8640.c | 51 ++++++++++++++++++++------
>  2 files changed, 40 insertions(+), 12 deletions(-)

Reviewed-by: Douglas Anderson <dianders@...omium.org>