From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Wilson Date: Wed, 22 Feb 2012 16:36:32 +0000 Subject: Re: Kernel Display and Video API Consolidation mini-summit at ELC 2012 - Notes Message-Id: List-Id: References: <201201171126.42675.laurent.pinchart@ideasonboard.com> <1775349.d0yvHiVdjB@avalon> <20120217095554.GA5511@phenom.ffwll.local> <2168398.Pv8ir5xFGf@avalon> <20120222162424.GE4872@phenom.ffwll.local> In-Reply-To: <20120222162424.GE4872@phenom.ffwll.local> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Daniel Vetter , James Simmons Cc: Tomasz Stanislawski , linux-fbdev@vger.kernel.org, Sakari Ailus , Marcus Lorentzon , Pawel Osciak , Magnus Damm , dri-devel@lists.freedesktop.org, Alexander Deucher , Rob Clark , linux-media@vger.kernel.org, Marek Szyprowski On Wed, 22 Feb 2012 17:24:24 +0100, Daniel Vetter wrote: > On Wed, Feb 22, 2012 at 04:03:21PM +0000, James Simmons wrote: > > Fbcon scrolling at be painful at HD or better modes. Fbcon needs 3 > > possible accels; copyarea, imageblit, and fillrect. The first two could be > > hooked from the TTM layer. Its something I plan to experiment to see if > > its worth it. > > Let's bite into this ;-) I know that fbcon scrolling totally sucks on big > screens, but I also think it's a total waste of time to fix this. Imo > fbcon has 2 use-cases: > - display an OOSP. > - allow me to run fsck (or any other desaster-recovery stuff). 3. Show panics. Ensuring that nothing prevents the switch to fbcon and displaying the panic message is the reason why we haven't felt inclined to accelerate fbcon - it just gets messy for no real gain. For example: https://bugs.freedesktop.org/attachment.cgi?idH933 which doesn't handle flushing of pending updates via the GPU when writing with the CPU during interrupts (i.e. a panic). -Chris -- Chris Wilson, Intel Open Source Technology Centre