linux-kernel - Re: [PATCH V3] drm/panel: boe-tv101wum-nl6: Fine tune Himax83102-j02 panel HFP and HBP

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Message-ID: <CAD=FV=UxN9vgWM9e1n_1pqcOJqzhhVtE7H2h+XMf0o_Mo7Jz5g@mail.gmail.com>
Date:   Tue, 21 Nov 2023 10:14:43 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Cong Yang <yangcong5@...qin.corp-partner.google.com>
Cc:     Sam Ravnborg <sam@...nborg.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Hsin-Yi Wang <hsinyi@...gle.com>, zhouruihai@...qin.com,
        David Airlie <airlied@...il.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3] drm/panel: boe-tv101wum-nl6: Fine tune Himax83102-j02
 panel HFP and HBP

Hi,

On Mon, Nov 20, 2023 at 10:05 AM Doug Anderson <dianders@...gle.com> wrote:
>
> Hi,
>
> On Sun, Nov 19, 2023 at 6:01 PM Cong Yang
> <yangcong5@...qin.corp-partner.google.com> wrote:
> >
> > The refresh reported by modetest is 60.46Hz, and the actual measurement
> > is 60.01Hz, which is outside the expected tolerance. Adjust hporch and
> > pixel clock to fix it. After repair, modetest and actual measurement were
> > all 60.01Hz.
> >
> > Modetest refresh = Pixel CLK/ htotal* vtotal, but measurement frame rate
> > is HS->LP cycle time(Vblanking). Measured frame rate is not only affecte
> > by Htotal/Vtotal/pixel clock, also affected by Lane-num/PixelBit/LineTime
> > /DSI CLK. Assume that the DSI controller could not make the mode that we
> > requested(presumably it's PLL couldn't generate the exact pixel clock?).
> > If you use a different DSI controller, you may need to readjust these
> > parameters. Now this panel looks like it's only used by me on the MTK
> > platform, so let's change this set of parameters.
> >
> > Fixes: 1bc2ef065f13 ("drm/panel: Support for Starry-himax83102-j02 TDDI MIPI-DSI panel")
> > Signed-off-by: Cong Yang <yangcong5@...qin.corp-partner.google.com>
> > Reviewed-by: Douglas Anderson <dianders@...omium.org>
> > ---
> > Chage since V2:
> >
> > - Update commit message.
> >
> > V2: https://lore.kernel.org/all/20231117032500.2923624-1-yangcong5@huaqin.corp-partner.google.com
> >
> > Chage since V1:
> >
> > - Update commit message.
> >
> > V1: https://lore.kernel.org/all/20231110094553.2361842-1-yangcong5@huaqin.corp-partner.google.com
> > ---
> >  drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
>
> As per previous discussions, this seems OK to me. I'll give it one
> more day for anyone to speak up and then plan to land it.

Pushed to drm-misc-fixes:

cea7008190ad drm/panel: boe-tv101wum-nl6: Fine tune Himax83102-j02
panel HFP and HBP