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

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Date:   Mon, 20 Nov 2023 10:05:44 -0800
From:   Doug Anderson <dianders@...gle.com>
To:     Cong Yang <yangcong5@...qin.corp-partner.google.com>
Cc:     sam@...nborg.org, neil.armstrong@...aro.org, daniel@...ll.ch,
        hsinyi@...gle.com, zhouruihai@...qin.com, airlied@...il.com,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] drm/panel: boe-tv101wum-nl6: Fine tune Himax83102-j02
 panel HFP and HBP

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.

-Doug