linux-kernel - Re: [PATCH 1/1] drm/panel: st7703: Fix vertical refresh rate of XBD599

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Message-ID: <CA+pv=HPY1HCDJ=sHeg_S7ZusS1RqiYvGOUf2bPVZK7Rq_EfHUg@mail.gmail.com>
Date:   Sun, 26 Feb 2023 11:54:57 -0500
From:   Slade Watkins <srw@...dewatkins.net>
To:     frank@...manns.dev
Cc:     Guido Günther <agx@...xcpu.org>,
        Purism Kernel Team <kernel@...i.sm>,
        Ondrej Jirman <megous@...ous.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] drm/panel: st7703: Fix vertical refresh rate of XBD599

On Sun, Feb 19, 2023 at 6:46 AM Frank Oltmanns <frank@...manns.dev> wrote:
>
> Fix the XBD599 panel's slight visual stutter by correcting the pixel
> clock speed so that the panel's 60Hz vertical refresh rate is met.
>
> Set the clock speed using the underlying formula instead of a magic
> number. To have a consistent procedure for both panels, set the JH057N
> panel's clock also as a formula.
> ---

Hi Frank,
Just wanted to let you know that this appears to be missing your Signed-off-by:.

Thanks,
-- Slade

>  drivers/gpu/drm/panel/panel-sitronix-st7703.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> index 6747ca237ced..cd7d631f7573 100644
> --- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> +++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> @@ -139,7 +139,7 @@ static const struct drm_display_mode jh057n00900_mode = {
>         .vsync_start = 1440 + 20,
>         .vsync_end   = 1440 + 20 + 4,
>         .vtotal      = 1440 + 20 + 4 + 12,
> -       .clock       = 75276,
> +       .clock       = (720 + 90 + 20 + 20) * (1440 + 20 + 4 + 12) * 60 / 1000,
>         .flags       = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
>         .width_mm    = 65,
>         .height_mm   = 130,
> @@ -324,7 +324,7 @@ static const struct drm_display_mode xbd599_mode = {
>         .vsync_start = 1440 + 18,
>         .vsync_end   = 1440 + 18 + 10,
>         .vtotal      = 1440 + 18 + 10 + 17,
> -       .clock       = 69000,
> +       .clock       = (720 + 40 + 40 + 40) * (1440 + 18 + 10 + 17) * 60 / 1000,
>         .flags       = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
>         .width_mm    = 68,
>         .height_mm   = 136,
> --
> 2.39.1
>