linux-kernel - Re: [PATCH v4 3/4] drm/panel: atna33xc20: Take advantage of wait_hpd_asserted() in struct drm_dp

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Date:   Wed, 15 Jun 2022 14:10:22 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     dri-devel@...ts.freedesktop.org,
        Stephen Boyd <swboyd@...omium.org>,
        Robert Foss <robert.foss@...aro.org>,
        Philip Chen <philipchen@...omium.org>,
        Sankeerth Billakanti <quic_sbillaka@...cinc.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Sam Ravnborg <sam@...nborg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/4] drm/panel: atna33xc20: Take advantage of
 wait_hpd_asserted() in struct drm_dp_aux

On Wed, 15 Jun 2022 at 00:54, Douglas Anderson <dianders@...omium.org> wrote:
>
> Let's add support for being able to read the HPD pin even if it's
> hooked directly to the controller. This will let us take away the
> waiting in the AUX transfer functions of the eDP controller drivers.
>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>
> Changes in v4:
> - Reorganized logic as per Dmitry's suggestion.
>
> Changes in v3:
> - Don't check "hpd_asserted" boolean when unset.
> - Handle errors from gpiod_get_value_cansleep() properly.
>
> Changes in v2:
> - Change is_hpd_asserted() to wait_hpd_asserted()
>
>  .../gpu/drm/panel/panel-samsung-atna33xc20.c  | 51 ++++++++++++++-----
>  1 file changed, 38 insertions(+), 13 deletions(-)
>

-- 
With best wishes
Dmitry