linux-kernel - Re: [PATCHv6 4/4] drm/omap: add support for manually updated displays

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Date:   Wed, 3 Apr 2019 17:11:09 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Pavel Machek <pavel@....cz>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        "H. Nikolaus Schaller" <hns@...delico.com>,
        dri-devel@...ts.freedesktop.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com
Subject: Re: [PATCHv6 4/4] drm/omap: add support for manually updated displays

* Sebastian Reichel <sebastian.reichel@...labora.com> [190403 20:14]:
> This adds the required infrastructure for manually updated displays,
> such as DSI command mode panels. While those panels often support
> partial updates we currently always do a full refresh.
> 
> The display will be refreshed when something calls the dirty callback,
> such as libdrm's drmModeDirtyFB(). This is currently being done at least
> by the kernel console and Xorg (with modesetting driver) in their
> default configuration. Weston does not implement this and the fbdev
> backend does not work (display will not update). Weston's DRM backend
> uses double buffering and the page flip will also trigger a display
> refresh.

I've tested this with Linux next and the latest lm3532
patches and it works fine as long as we leave out the
backlight = <&lcd_backlight> entry from dts like I
replied in the lm3532 tread. So as far as I'm concerned,
we're good to go:

Tested-by: Tony Lindgren <tony@...mide.com>