From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Antonino A. Daplas" Subject: Re: Re: [PATCH][RFC] Add support for Epson S1D13806 FB Date: Mon, 14 Mar 2005 23:18:25 +0800 Message-ID: <200503142318.25740.adaplas@hotpop.com> References: <20050314130014.55A073658E8@mail.esiee.fr> <200503142207.57074.adaplas@hotpop.com> <20050314143509.GD2695@linux-sh.org> Reply-To: linux-fbdev-devel@lists.sourceforge.net Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.11] helo=sc8-sf-mx1.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1DArL2-0006SJ-NP for linux-fbdev-devel@lists.sourceforge.net; Mon, 14 Mar 2005 07:18:36 -0800 Received: from smtp-out.hotpop.com ([38.113.3.71]) by sc8-sf-mx1.sourceforge.net with esmtp (Exim 4.41) id 1DArL2-0002tF-8I for linux-fbdev-devel@lists.sourceforge.net; Mon, 14 Mar 2005 07:18:36 -0800 Received: from hotpop.com (kubrick.hotpop.com [38.113.3.103]) by smtp-out.hotpop.com (Postfix) with SMTP id 3B29F14B45C5 for ; Mon, 14 Mar 2005 15:18:27 +0000 (UTC) In-Reply-To: <20050314143509.GD2695@linux-sh.org> Content-Disposition: inline Sender: linux-fbdev-devel-admin@lists.sourceforge.net Errors-To: linux-fbdev-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: List-Post: List-Help: List-Subscribe: , List-Archive: Content-Type: text/plain; charset="us-ascii" To: linux-fbdev-devel@lists.sourceforge.net, Paul Mundt Cc: adaplas@pol.net On Monday 14 March 2005 22:35, Paul Mundt wrote: > On Mon, Mar 14, 2005 at 10:10:35PM +0800, Antonino A. Daplas wrote: > > BTW, I would guess that scrolling is slow in this driver. Since this > > driver can do pan_display, If this: > > > > info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN; > > > > is added somewhere before register_framebuffer(), and var->xres_virtual > > > var->xres, you might get a several-fold increase in scrolling speed > > (since scrolling mode will be SCROLL_PAN_REDRAW instead of > > SCROLL_REDRAW). > > This is interesting. When FBINFO_HWACCEL_YPAN was added to hitfb, it slowed > down scrolling by several orders of magnitude. Perhaps it was something > relating to how the pan_display was implemented, but it's definitely not > a general win for everyone.. Some hardware waits for vblank/vsync before updating the start address, and in the case of fbcon, that will be for each row of text. So yes, in this case, ypan is not a win. Tony ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click