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

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Date:   Mon, 27 Mar 2023 22:21:27 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Roman Beranek <romanberanek@...oud.com>
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 09:53:11PM +0100, Roman Beranek wrote:
> 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.

Ok, as long as you confirmed it with multiple panel and multiple lanes
count, I'm ok with it :)

Maxime