From mboxrd@z Thu Jan 1 00:00:00 1970 From: Manish RATHI Subject: query (critical problem) Date: Thu, 15 Jul 2004 17:40:14 +0530 Sender: linux-fbdev-devel-admin@lists.sourceforge.net Message-ID: <004a01c46a64$af896ef0$7c04b40a@dlh.st.com> Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: 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 1Bl54L-0008SX-45 for linux-fbdev-devel@lists.sourceforge.net; Thu, 15 Jul 2004 05:10:33 -0700 Received: from beta.dmz-eu.st.com ([164.129.1.35]) by sc8-sf-mx1.sourceforge.net with esmtp (TLSv1:AES256-SHA:256) (Exim 4.34) id 1Bl54J-0003ww-H8 for linux-fbdev-devel@lists.sourceforge.net; Thu, 15 Jul 2004 05:10:31 -0700 Received: from zeta.dmz-eu.st.com (ns2.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 29981DC43 for ; Thu, 15 Jul 2004 12:10:20 +0000 (GMT) Received: from zeta.dmz-eu.st.com (localhost [127.0.0.1]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id C074512301 for ; Thu, 15 Jul 2004 12:10:19 +0000 (UTC) Received: from mail2.dlh.st.com (mail2.dlh.st.com [138.198.194.103]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 5679EF446 for ; Thu, 15 Jul 2004 12:10:17 +0000 (GMT) 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 Hi, I've ported linux on our chip using linux kernel 2.4.20. On chip we = have a display interface on which epson panel is attached. We've written = a display driver using framebuffer driver as a upper layer. Problem with this driver is that due to framebuffer concept we don't = know when data is updated in framebuffer as this is done by application. So we don't know when to transfer data from framebuffer to panel memory. = how a driver can know this trigger. B'coz of this we have only one option left that is always transfer data=20 to dif panel from fraembuffer irrespective of any trigger. This will create power problem. As i understand microwindows/qt or any graphics package call open, mmap = from framebuffer. Whenever it draw a line it doesn't call any driver = interface. Is there any solution? Is there any standard interface of application with driver which tell=20 that data is to be updated from frmebuffer to panel memory? Thanks Regards Manish ------------------------------------------------------- This SF.Net email is sponsored by BEA Weblogic Workshop FREE Java Enterprise J2EE developer tools! Get your free copy of BEA WebLogic Workshop 8.1 today. http://ads.osdn.com/?ad_id=4721&alloc_id=10040&op=click