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From:   Doug Anderson <dianders@chromium.org>
Date:   Thu, 28 Oct 2021 12:41:21 -0700
Message-ID: <CAD=FV=VdybQftD90sZK36nFevkK2Et70KhTT96swi9WY0S-CEw@mail.gmail.com>
Subject: Re: [PATCH v5 2/2] drm/bridge: parade-ps8640: Populate devices on aux-bus
To:     Philip Chen <philipchen@chromium.org>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Stephen Boyd <swboyd@chromium.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        David Airlie <airlied@linux.ie>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
        Jonas Karlman <jonas@kwiboo.se>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Robert Foss <robert.foss@linaro.org>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        Andrzej Hajda <andrzej.hajda@intel.com>,
        Sam Ravnborg <sam@ravnborg.org>
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Hi,

On Thu, Oct 28, 2021 at 10:58 AM Philip Chen <philipchen@chromium.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@chromium.org>
> Reviewed-by: Stephen Boyd <swboyd@chromium.org>
> ---
> In v4, I factored out the "ps8640_ensure_hpd" change and added it to patch 1/2
> in this patch series. But I forgot to mention it in v4 change log. Edit v4
> change log retroactively.
>
> In v3, I factored out the "put_sync_suspend" change and added it to patch 1/2
> in this patch series. But I forgot to mention it in v3 change log. Edit v3
> change log retroactively.
>
> (no changes since v4)
>
> Changes in v4:
> - Move the change of "ps8640_ensure_hpd" to patch 1/2 in this patch series.
>
> Changes in v3:
> - Fix when to call of_node_put() in ps8640_of_panel_on_aux_bus()
> - Move the change of "put_sync_suspend" to patch 1/2 in this patch series.
>
> 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
>
>  drivers/gpu/drm/bridge/Kconfig         |  1 +
>  drivers/gpu/drm/bridge/parade-ps8640.c | 51 ++++++++++++++++++++------
>  2 files changed, 40 insertions(+), 12 deletions(-)

Should have carried my tag from v4, but here it is again:

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