linux-kernel - Re: [PATCHv4 6/6] drm/omap: add support for manually updated displays

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Message-ID: <20181117211654.GF22813@amd>
Date:   Sat, 17 Nov 2018 22:16:54 +0100
From:   Pavel Machek <pavel@....cz>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Tony Lindgren <tony@...mide.com>,
        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: [PATCHv4 6/6] drm/omap: add support for manually updated displays

On Fri 2018-11-16 00:06:45, Sebastian Reichel wrote:
> 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 trigger a display refresh
> and seems to work as expected.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>

Acked-by: Pavel Machek <pavel@....cz>

> @@ -708,6 +802,18 @@ struct drm_crtc *omap_crtc_init(struct drm_device *dev,
>  	omap_crtc->channel = channel;
>  	omap_crtc->name = channel_names[channel];
>  
> +	/* We want to refresh manually updated displays from dirty callback,

Nit: Comment style does not match coding style.

/*
 *
 
 --- a/drivers/gpu/drm/omapdrm/omap_fb.c
> +++ b/drivers/gpu/drm/omapdrm/omap_fb.c
> @@ -66,8 +66,49 @@ struct omap_framebuffer {
>  	struct mutex lock;
>  };
>  
> +/* iterate thru all the crts, returning ones that are attached to the same fb */

Start with big letter -- "Iterate"?

Thanks,
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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