linux-kernel - Re: [PATCH v5 13/17] drm/panel: khadas-ts050: update timings to achieve 60Hz refresh rate

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Date:   Wed, 31 May 2023 11:23:17 +0200
From:   Nicolas Belin <nbelin@...libre.com>
To:     Neil Armstrong <neil.armstrong@...aro.org>
Cc:     Jerome Brunet <jbrunet@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        "Lukas F. Hartmann" <lukas@...re.com>,
        linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-phy@...ts.infradead.org
Subject: Re: [PATCH v5 13/17] drm/panel: khadas-ts050: update timings to
 achieve 60Hz refresh rate

Le mar. 30 mai 2023 à 09:38, Neil Armstrong
<neil.armstrong@...aro.org> a écrit :
>
> This updates the panel timings to achieve a clean 60Hz refresh rate.
>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  drivers/gpu/drm/panel/panel-khadas-ts050.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-khadas-ts050.c b/drivers/gpu/drm/panel/panel-khadas-ts050.c
> index 1ab1ebe30882..b942a0162274 100644
> --- a/drivers/gpu/drm/panel/panel-khadas-ts050.c
> +++ b/drivers/gpu/drm/panel/panel-khadas-ts050.c
> @@ -568,7 +568,7 @@ static const struct khadas_ts050_panel_cmd init_code[] = {
>         {0xfb, 0x01},
>         /* Select CMD1 */
>         {0xff, 0x00},
> -       {0xd3, 0x05}, /* RGBMIPICTRL: VSYNC back porch = 5 */
> +       {0xd3, 0x22}, /* RGBMIPICTRL: VSYNC back porch = 34 */
>         {0xd4, 0x04}, /* RGBMIPICTRL: VSYNC front porch = 4 */
>  };
>
> @@ -717,15 +717,15 @@ static int khadas_ts050_panel_disable(struct drm_panel *panel)
>  }
>
>  static const struct drm_display_mode default_mode = {
> -       .clock = 120000,
> -       .hdisplay = 1088,
> -       .hsync_start = 1088 + 104,
> -       .hsync_end = 1088 + 104 + 4,
> -       .htotal = 1088 + 104 + 4 + 127,
> +       .clock = 160000,
> +       .hdisplay = 1080,
> +       .hsync_start = 1080 + 117,
> +       .hsync_end = 1080 + 117 + 5,
> +       .htotal = 1080 + 117 + 5 + 160,
>         .vdisplay = 1920,
>         .vsync_start = 1920 + 4,
> -       .vsync_end = 1920 + 4 + 2,
> -       .vtotal = 1920 + 4 + 2 + 3,
> +       .vsync_end = 1920 + 4 + 3,
> +       .vtotal = 1920 + 4 + 3 + 31,
>         .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
>  };
>
>
> --
> 2.34.1
>
Reviewed-by: Nicolas Belin <nbelin@...libre.com>
Tested-by: Nicolas Belin <nbelin@...libre.com> # on Khadas VIM3 + TS050 Panel

Thanks,
Nicolas