linux-kernel - Re: [PATCH] drm/meson: add support for 2560x1440 resolution output

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Message-ID: <CAFBinCCsTqsn06A5oVXGTW6PgmSQH0bHE+8PSftyWNRAbYUTcA@mail.gmail.com>
Date: Sun, 28 Sep 2025 23:24:01 +0200
From: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To: Christian Hewitt <christianshewitt@...il.com>
Cc: Neil Armstrong <neil.armstrong@...aro.org>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>, 
	dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Dongjin Kim <tobetter@...il.com>
Subject: Re: [PATCH] drm/meson: add support for 2560x1440 resolution output

Hi Christian,

On Sat, Sep 27, 2025 at 3:02 PM Christian Hewitt
<christianshewitt@...il.com> wrote:
[...]
> @@ -894,6 +908,10 @@ static void meson_vclk_set(struct meson_drm *priv,
>                         m = 0xf7;
>                         frac = vic_alternate_clock ? 0x8148 : 0x10000;
>                         break;
> +               case 4830000:
> +                       m = 0xc9;
> +                       frac = 0xd560;
> +                       break;
Initially I thought this was wrong because it's only added for the
G12A (which is also used on G12B and SM1) code-path, leaving out the
GX SoCs.

Was the 2560x1440 mode tested on a computer monitor or a TV?
I suspect it's the former, so I think it expected the code to take the
MESON_VCLK_TARGET_DMT path, which automatically calculates m and frac.

I'll give it a try on Friday as I do have a computer monitor with that
resolution - so any hints for testing are welcome!


Best regards,
Martin