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From: Archit Taneja <archit@ti.com>
To: "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>
Subject: Synchronization between a crtc mode_set and page_flip?
Date: Wed, 2 Apr 2014 15:22:47 +0530	[thread overview]
Message-ID: <533BDDEF.1050900@ti.com> (raw)

Hi,

I was trying to figure out how we are supposed to manage synchronization 
between a mode_set and a page_flip called on a crtc.

Say, if a mode_set is immediately followed by a page_flip. The driver 
can't process the page_flip straight away since the hardware is still 
completing the mode_set.

What is the driver supposed to do? Should it return -EBUSY? Or should it 
somehow queue the page_flip task internally?

A lot of libdrm applications seem to call mode_set, and call a page_flip 
soon after it. They tend to bail out if page_flip returns an error, they 
don't try to do another page_flip if it fails the first time. Is this 
okay behaviour?

Thanks,
Archit

             reply	other threads:[~2014-04-02  9:53 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-02  9:52 Archit Taneja [this message]
2014-04-02 13:11 ` Synchronization between a crtc mode_set and page_flip? Rob Clark
2014-04-03  8:58   ` Archit Taneja
2014-04-03 21:24     ` Daniel Vetter
2014-04-04  7:21       ` Archit Taneja
2014-04-04 11:54         ` Rob Clark

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