From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomi Valkeinen Subject: Re: DSS2: Simultaneous DSI and DPI panels Date: Fri, 13 May 2011 14:18:53 +0300 Message-ID: <1305285533.2268.41.camel@deskari> References: <4DCD0BA4.2050904@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from na3sys009aog108.obsmtp.com ([74.125.149.199]:46277 "EHLO na3sys009aog108.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932213Ab1EMLS5 (ORCPT ); Fri, 13 May 2011 07:18:57 -0400 Received: by mail-ew0-f42.google.com with SMTP id 2so902480ewy.15 for ; Fri, 13 May 2011 04:18:56 -0700 (PDT) In-Reply-To: <4DCD0BA4.2050904@ti.com> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Archit Taneja Cc: Juha Kuikka , "linux-omap@vger.kernel.org Mailing List" On Fri, 2011-05-13 at 16:14 +0530, Archit Taneja wrote: > Hi, > > On Friday 13 May 2011 12:46 AM, Juha Kuikka wrote: > > Hello, > > > > I was wondering if it would be possible to run DPI and DSI interfaces > > simultaneously with OMAP3 (DM3730). > > > > Limitations: > > - DSI would have to be in video mode (data to DSI phy through video > > port with H/VSYNC signaling, OMAP_DSS_PARALLELMODE_BYPASS) > > - DSI PLL would need to be used for clock source > > - Both the DPI and DSI panels would have to accept identical clocking > > (PCLK, blanking intervals etc). > > - Data lane # must match. > > - And of course same data would go to both > > > > I realize the current SW does not support this, but I'm more wondering > > if it is possible from the HW point of view because it seems to me > > that data out from DISPC is pretty much identical in both cases. > > I don't think this is possible on OMAP3, there is one LCD manager in > OMAP3 which can either feed pixels to DPI or DSI. > > The only way you could run 2 panels is by routing LCD manager's content > to DPI, and use DSI's capability to do a system DMA directly and send > the data to the panel(bypassing DISPC), I don't think the system DMA > method will work with a video mode panel, only command mode panels will > do here. Yes, that is correct. DPI + DSI command mode would work, although in that case the DSI panel would be driven by CPU or sDMA, both of which are not very good at the job. Tomi