linux-kernel - Re: [PATCH] drm/panel: jdi-fhd-r63452: move DCS off commands to disable

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Date: Fri, 10 May 2024 09:10:34 +0200
From: Barnabás Czémán <trabarni@...il.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Neil Armstrong <neil.armstrong@...aro.org>, Jessica Zhang <quic_jesszhan@...cinc.com>, 
	Sam Ravnborg <sam@...nborg.org>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/panel: jdi-fhd-r63452: move DCS off commands to disable

On Fri, May 10, 2024 at 8:46 AM Barnabás Czémán <trabarni@...il.com> wrote:
>
> On Fri, May 10, 2024 at 2:56 AM Dmitry Baryshkov
> <dmitry.baryshkov@...aro.org> wrote:
> >
> > On Thu, May 09, 2024 at 08:14:07PM +0200, Barnabás Czémán wrote:
> > > Move DCS off commands from .unprepare to .disable so that they
> > > actually reach the DSI host.
> > >
> > > Signed-off-by: Barnabás Czémán <trabarni@...il.com>
> > > ---
> > >  drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c | 12 ++++++++++--
> > >  1 file changed, 10 insertions(+), 2 deletions(-)
> >
> > I don't think this is correct. If the driver sends enable commands in
> > prepare, it should be able to send commands during unprepare too.
> >
> It cannot send commands in unprepare, there are multiple panel drivers
> what do the same.
> Every panel drivers which have DCS commands to be sent in unprepare
> has similar error messages with mdp5/dpu.
>
> [   92.322564] panel-td4320-boeplus c994000.dsi.0: sending command
> 0x28 failed: -22
> [   92.322635] panel-td4320-boeplus c994000.dsi.0: Failed to
> un-initialize panel: -22
>
>
Here is the error messages, these are comes from unprepare by every panel off:
[  121.295290] panel-jdi-fhd-r63452 994000.dsi.0: transmit data failed: -22
[  121.295368] panel-jdi-fhd-r63452 994000.dsi.0: Failed to
un-initialize panel: -22
[  184.783019] panel-jdi-fhd-r63452 994000.dsi.0: transmit data failed: -22
[  184.783066] panel-jdi-fhd-r63452 994000.dsi.0: Failed to
un-initialize panel: -22
with this patch these errors no more.
prepare works because of this flag ctx->panel.prepare_prev_first = true;
> > >
> > > diff --git a/drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c b/drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c
> > > index 483dc88d16d8..f7222974d6ed 100644
> > > --- a/drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c
> > > +++ b/drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c
> > > @@ -169,6 +169,15 @@ static int jdi_fhd_r63452_prepare(struct drm_panel *panel)
> > >  }
> > >
> > >  static int jdi_fhd_r63452_unprepare(struct drm_panel *panel)
> > > +{
> > > +     struct jdi_fhd_r63452 *ctx = to_jdi_fhd_r63452(panel);
> > > +
> > > +     gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +static int jdi_fhd_r63452_disable(struct drm_panel *panel)
> > >  {
> > >       struct jdi_fhd_r63452 *ctx = to_jdi_fhd_r63452(panel);
> > >       struct device *dev = &ctx->dsi->dev;
> > > @@ -178,8 +187,6 @@ static int jdi_fhd_r63452_unprepare(struct drm_panel *panel)
> > >       if (ret < 0)
> > >               dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
> > >
> > > -     gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> > > -
> > >       return 0;
> > >  }
> > >
> > > @@ -219,6 +226,7 @@ static int jdi_fhd_r63452_get_modes(struct drm_panel *panel,
> > >  static const struct drm_panel_funcs jdi_fhd_r63452_panel_funcs = {
> > >       .prepare = jdi_fhd_r63452_prepare,
> > >       .unprepare = jdi_fhd_r63452_unprepare,
> > > +     .disable = jdi_fhd_r63452_disable,
> > >       .get_modes = jdi_fhd_r63452_get_modes,
> > >  };
> > >
> > >
> > > ---
> > > base-commit: 704ba27ac55579704ba1289392448b0c66b56258
> > > change-id: 20240509-jdi-use-disable-ee29098d9c81
> > >
> > > Best regards,
> > > --
> > > Barnabás Czémán <trabarni@...il.com>
> > >
> >
> > --
> > With best wishes
> > Dmitry