linux-kernel - Re: [PATCH] drm/tidss: Soft Reset DISPC on startup

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Date:   Tue, 12 Apr 2022 16:20:49 -0500
From:   Nishanth Menon <nm@...com>
To:     Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        <tony@...mide.com>
CC:     Devarsh Thakkar <devarsht@...com>, <linux-kernel@...r.kernel.org>,
        <jyri.sarha@....fi>, <tomba@...nel.org>, <airlied@...ux.ie>,
        <daniel@...ll.ch>, <dri-devel@...ts.freedesktop.org>,
        <a-bhatia1@...com>, <r-ravikumar@...com>, <nikhil.nd@...com>,
        <linux-arm-kernel@...ts.infradead.org>, <vigneshr@...com>,
        <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH] drm/tidss: Soft Reset DISPC on startup

On 17:24-20220412, Tomi Valkeinen wrote:
> Hi,
> 
> On 14/03/2022 13:37, Devarsh Thakkar wrote:
> > Soft reset the display subsystem controller on startup and wait for
> > the reset to complete. This helps the scenario where display was
> > already in use by some other core before the linux was booted.
> 
> The reason the omapdrm doesn't do a reset is that the PM features on some of
> the DSS registers were set and controlled outside dss driver, so the dss
> driver could not do a reset just like that. That design was carried to the
> tidss driver, although I'm not sure if the reason is valid on AM6 and J7
> platforms.
> 
> If that reasoning is not valid, this patch is ok and:
> 
> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> 

Tony - sysc control for older omap devices still control this directly?

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D