linux-kernel - Re: [PATCH v1 1/2] drm/panel: jd9365da: Move the sending location of the 11/29 command

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Message-ID: <CA+6=WdQ6q=Zmji8KxCPYK17pFY4UAUBOykd5Tx4N_RZ1MfgOdg@mail.gmail.com>
Date: Mon, 5 Aug 2024 10:38:36 +0800
From: zhaoxiong lv <lvzhaoxiong@...qin.corp-partner.google.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: neil.armstrong@...aro.org, quic_jesszhan@...cinc.com, 
	maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de, 
	dianders@...omium.org, hsinyi@...gle.com, airlied@...il.com, daniel@...ll.ch, 
	jagan@...eble.ai, dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] drm/panel: jd9365da: Move the sending location of
 the 11/29 command

Hi all

Do you have any other suggestions for this patch?
Looking forward to your reply, thank you

BR

On Tue, Jul 30, 2024 at 4:09 AM Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> wrote:
>
> On Mon, 29 Jul 2024 at 06:10, zhaoxiong lv
> <lvzhaoxiong@...qin.corp-partner.google.com> wrote:
> >
> > On Sun, Jul 28, 2024 at 12:59 AM Dmitry Baryshkov
> > <dmitry.baryshkov@...aro.org> wrote:
> > >
> > > On Thu, Jul 25, 2024 at 04:32:44PM GMT, Zhaoxiong Lv wrote:
> > > > Move the 11/29 command from enable() to init() function
> > > >
> > > > As mentioned in the patch:
> > > > https://lore.kernel.org/all/20240624141926.5250-2-lvzhaoxiong@huaqin.corp-partner.google.com/
> > > >
> > > > Our DSI host has different modes in prepare() and enable()
> > > > functions. prepare() is in LP mode and enable() is in HS mode.
> > > > Since the 11/29 command must also be sent in LP mode,
> > > > so we also move 11/29 command to the init() function.
> > > >
> > > > After moving the 11/29 command to the init() function,
> > > > we no longer need additional delay judgment, so we delete
> > > > variables "exit_sleep_to_display_on_delay_ms" and
> > > > "display_on_delay_ms".
> > >
> > > Won't this result in a garbage being displayed on the panel during
> > > startup?
> >
> > Hi Dmitry
> >
> > We just moved "Exit sleep mode" and "set display on" from the enable()
> > function to the init() function and did not make any other changes.
> > It seems that many drivers also put the "init code" and "Exit sleep
> > mode" in one function.
>
> You have moved the functions that actually enable the display out. And
> by the definition it's expected that there is no video stream during
> pre_enable(), it gets turned on afterwards. That's why I asked if
> there is any kind of garbage or not.
>
> > In addition, we briefly tested the kingdisplay_kd101ne3 panel and
> > melfas_lmfbx101117480 panel, and it seems that there is no garbage on
> > the panel.
>
> Ack.
>
> >
> > BR
> > >
> > > >
> > > > Signed-off-by: Zhaoxiong Lv <lvzhaoxiong@...qin.corp-partner.google.com>
> > > > ---
> > > >  .../gpu/drm/panel/panel-jadard-jd9365da-h3.c  | 59 ++++++++++---------
> > > >  1 file changed, 32 insertions(+), 27 deletions(-)
> > >
>
>
>
> --
> With best wishes
> Dmitry