linux-kernel - Re: Aw: Re: [PATCH] soc: mediatek: mmsys: fix HDMI output on mt7623/bananapi-r2

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Message-ID: <dbe23d2a-cd29-0782-1b7d-bcb5c6683607@collabora.com>
Date:   Mon, 12 Jul 2021 19:32:36 +0200
From:   Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
To:     Frank Wunderlich <frank-w@...lic-files.de>
Cc:     David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        Frank Wunderlich <linux@...web.de>,
        linux-arm-kernel@...ts.infradead.org,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Collabora Kernel ML <kernel@...labora.com>
Subject: Re: Aw: Re: [PATCH] soc: mediatek: mmsys: fix HDMI output on
 mt7623/bananapi-r2

Hi,

On 12.07.21 19:16, Frank Wunderlich wrote:
> Hi,
> 
> it turns out that problem is the read+or of the new value
> 
> i reverted my patch and changed
> 
> reg = readl_relaxed(mmsys->regs + routes[i].addr) | routes[i].val;
> writel_relaxed(reg, mmsys->regs + routes[i].addr);
> 
> to
> 
> writel_relaxed(routes[i].val, mmsys->regs + routes[i].addr);
> 
> and it works too, but maybe it breaks other platforms

Interesting, I can test if it fix that similar bug on mt8173 when resume from suspend.

Thanks,
Dafna

> 
> regards Frank
>