linux-kernel - Re: [PATCH] drm/sun4i: uncouple DSI dotclock divider from TCON0_DCLK

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Date:   Tue, 21 Mar 2023 21:53:11 +0100
From:   "Roman Beranek" <romanberanek@...oud.com>
To:     "Maxime Ripard" <maxime@...no.tech>
Cc:     "Chen-Yu Tsai" <wens@...e.org>, "David Airlie" <airlied@...il.com>,
        "Daniel Vetter" <daniel@...ll.ch>,
        "Jernej Skrabec" <jernej.skrabec@...il.com>,
        "Samuel Holland" <samuel@...lland.org>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-sunxi@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/sun4i: uncouple DSI dotclock divider from
 TCON0_DCLK_REG

On Tue Mar 21, 2023 at 5:50 PM CET, Roman Beranek wrote:

> > Also, how was it tested/confirmed?
>
> By counting Vblank interrupts (GIC 118).

Sorry, that was perhaps too abbreviated. To test this change, I set up
an A64 board running kmscube on DSI-1 and verified that the rate of
Vblank IRQs tracked with a video mode set on DSI-1, once with a 2-lane
panel and once with a 4-lane panel.

Roman