linux-kernel - Re: [PATCH v1 3/3] drm/panel : innolux-ej030na and abt-y030xx067a : add .enable and .disable

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Message-ID: <CAFsFa85Wb7HcxCqGCYQoSOHOTLJY9xtUHc85PoxO3XTbr=HN4g@mail.gmail.com>
Date:   Mon, 7 Mar 2022 19:12:49 +0100
From:   Christophe Branchereau <cbranchereau@...il.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v1 3/3] drm/panel : innolux-ej030na and abt-y030xx067a :
 add .enable and .disable

Hi Paul, it should in theory, but doesn't work in practice, the
display doesn't like having that bit set outside of the init sequence.

Feel free to experiment if you think you can make it work though, you
should have that panel on 1 or 2 devices I think.

KR
CB

On Wed, Mar 2, 2022 at 12:22 PM Paul Cercueil <paul@...pouillou.net> wrote:
>
> Hi Christophe,
>
> Le mar., mars 1 2022 at 16:31:22 +0100, Christophe Branchereau
> <cbranchereau@...il.com> a écrit :
> > Following the introduction of bridge_atomic_enable in the ingenic
> > drm driver, the crtc is enabled between .prepare and .enable, if
> > it exists.
> >
> > Add it so the backlight is only enabled after the crtc is, to avoid
> > graphical issues.
> >
> > Signed-off-by: Christophe Branchereau <cbranchereau@...il.com>
> > ---
> >  drivers/gpu/drm/panel/panel-abt-y030xx067a.c  | 23 ++++++++++++--
> >  drivers/gpu/drm/panel/panel-innolux-ej030na.c | 31
> > ++++++++++++++++---
> >  2 files changed, 48 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/panel/panel-abt-y030xx067a.c
> > b/drivers/gpu/drm/panel/panel-abt-y030xx067a.c
> > index f043b484055b..b5736344e3ec 100644
> > --- a/drivers/gpu/drm/panel/panel-abt-y030xx067a.c
> > +++ b/drivers/gpu/drm/panel/panel-abt-y030xx067a.c
> > @@ -183,8 +183,6 @@ static int y030xx067a_prepare(struct drm_panel
> > *panel)
> >               goto err_disable_regulator;
> >       }
> >
> > -     msleep(120);
> > -
> >       return 0;
> >
> >  err_disable_regulator:
> > @@ -202,6 +200,25 @@ static int y030xx067a_unprepare(struct drm_panel
> > *panel)
> >       return 0;
> >  }
> >
> > +static int y030xx067a_enable(struct drm_panel *panel)
> > +{
> > +     if (panel->backlight) {
> > +             /* Wait for the picture to be ready before enabling backlight */
> > +             msleep(120);
> > +     }
> > +
> > +     return 0;
> > +}
> > +
> > +static int y030xx067a_disable(struct drm_panel *panel)
> > +{
> > +     struct y030xx067a *priv = to_y030xx067a(panel);
> > +
> > +     regmap_clear_bits(priv->map, 0x06, REG06_XPSAVE);
>
> Shouldn't that be balanced by a regmap_set_bits() in the .enable()
> function?
>
> Cheers,
> -Paul
>
> > +
> > +     return 0;
> > +}
> > +
> >  static int y030xx067a_get_modes(struct drm_panel *panel,
> >                               struct drm_connector *connector)
> >  {
> > @@ -239,6 +256,8 @@ static int y030xx067a_get_modes(struct drm_panel
> > *panel,
> >  static const struct drm_panel_funcs y030xx067a_funcs = {
> >       .prepare        = y030xx067a_prepare,
> >       .unprepare      = y030xx067a_unprepare,
> > +     .enable         = y030xx067a_enable,
> > +     .disable        = y030xx067a_disable,
> >       .get_modes      = y030xx067a_get_modes,
> >  };
> >
> > diff --git a/drivers/gpu/drm/panel/panel-innolux-ej030na.c
> > b/drivers/gpu/drm/panel/panel-innolux-ej030na.c
> > index c558de3f99be..6de7370185cd 100644
> > --- a/drivers/gpu/drm/panel/panel-innolux-ej030na.c
> > +++ b/drivers/gpu/drm/panel/panel-innolux-ej030na.c
> > @@ -80,8 +80,6 @@ static const struct reg_sequence
> > ej030na_init_sequence[] = {
> >       { 0x47, 0x08 },
> >       { 0x48, 0x0f },
> >       { 0x49, 0x0f },
> > -
> > -     { 0x2b, 0x01 },
> >  };
> >
> >  static int ej030na_prepare(struct drm_panel *panel)
> > @@ -109,8 +107,6 @@ static int ej030na_prepare(struct drm_panel
> > *panel)
> >               goto err_disable_regulator;
> >       }
> >
> > -     msleep(120);
> > -
> >       return 0;
> >
> >  err_disable_regulator:
> > @@ -128,6 +124,31 @@ static int ej030na_unprepare(struct drm_panel
> > *panel)
> >       return 0;
> >  }
> >
> > +static int ej030na_enable(struct drm_panel *panel)
> > +{
> > +     struct ej030na *priv = to_ej030na(panel);
> > +
> > +     /* standby off */
> > +     regmap_write(priv->map, 0x2b, 0x01);
> > +
> > +     if (panel->backlight) {
> > +             /* Wait for the picture to be ready before enabling backlight */
> > +             msleep(120);
> > +     }
> > +
> > +     return 0;
> > +}
> > +
> > +static int ej030na_disable(struct drm_panel *panel)
> > +{
> > +     struct ej030na *priv = to_ej030na(panel);
> > +
> > +     /* standby on */
> > +     regmap_write(priv->map, 0x2b, 0x00);
> > +
> > +     return 0;
> > +}
> > +
> >  static int ej030na_get_modes(struct drm_panel *panel,
> >                            struct drm_connector *connector)
> >  {
> > @@ -165,6 +186,8 @@ static int ej030na_get_modes(struct drm_panel
> > *panel,
> >  static const struct drm_panel_funcs ej030na_funcs = {
> >       .prepare        = ej030na_prepare,
> >       .unprepare      = ej030na_unprepare,
> > +     .enable         = ej030na_enable,
> > +     .disable        = ej030na_disable,
> >       .get_modes      = ej030na_get_modes,
> >  };
> >
> > --
> > 2.34.1
> >
>
>