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

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Message-ID: <CAFsFa87U2REBB=W6c4yy5Y3u1nmPHoKY3_vn31tkM+7PZt1Omw@mail.gmail.com>
Date:   Mon, 21 Mar 2022 14:12:10 +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, yes that works fine, thanks for checking it out

On Mon, Mar 14, 2022 at 9:54 PM Paul Cercueil <paul@...pouillou.net> wrote:
>
> Hi Christophe,
>
> Le lun., mars 7 2022 at 19:12:49 +0100, Christophe Branchereau
> <cbranchereau@...il.com> a écrit :
> > 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.
>
> It does actually work in practice; what probably fails for you is the
> regmap_set_bits(), which causes a spi-read-then-write. Since AFAIK it
> is not possible to read registers from this panel (only write), then
> this does not work.
>
> An easy fix would be to just use REGCACHE_FLAT as the cache type in the
> regmap_config. Then regmap_set_bits() can be used.
>
> Cheers,
> -Paul
>
> >
> > 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
> >>  >
> >>
> >>
>
>