Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757838Ab1CBVQv (ORCPT ); Wed, 2 Mar 2011 16:16:51 -0500 Received: from wolverine01.qualcomm.com ([199.106.114.254]:63913 "EHLO wolverine01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757818Ab1CBVQs (ORCPT ); Wed, 2 Mar 2011 16:16:48 -0500 X-IronPort-AV: E=McAfee;i="5400,1158,6273"; a="77638259" X-IronPort-AV: E=Sophos;i="4.62,253,1297065600"; d="scan'208";a="56219172" From: Carl Vanderlip To: David Brown , Daniel Walker , Bryan Huntsman Cc: Dima Zavin , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Carl Vanderlip , linux-fbdev@vger.kernel.org (open list:FRAMEBUFFER LAYER) Subject: [PATCH 1/4] video: msmfb: Put the partial update magic value into the fix_screen struct. Date: Wed, 2 Mar 2011 13:16:36 -0800 Message-Id: <1299100596-11157-1-git-send-email-carlv@codeaurora.org> X-Mailer: git-send-email 1.7.3.3 In-Reply-To: <1299100542-11120-1-git-send-email-carlv@codeaurora.org> References: <1299100542-11120-1-git-send-email-carlv@codeaurora.org> To: David Brown , Daniel Walker , Bryan Huntsman Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1589 Lines: 44 From: Dima Zavin This can then be tested by userspace to see if the capability is supported. Userspace cannot rely on that value being left in var_screen, since userspace itself can change it. Signed-off-by: Dima Zavin Signed-off-by: Carl Vanderlip --- drivers/video/msm/msm_fb.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/drivers/video/msm/msm_fb.c b/drivers/video/msm/msm_fb.c index 5436aeb..fe5efe5 100644 --- a/drivers/video/msm/msm_fb.c +++ b/drivers/video/msm/msm_fb.c @@ -469,6 +469,18 @@ static void setup_fb_info(struct msmfb_info *msmfb) fb_info->var.yoffset = 0; if (msmfb->panel->caps & MSMFB_CAP_PARTIAL_UPDATES) { + /* + * Set the param in the fixed screen, so userspace can't + * change it. This will be used to check for the + * capability. + */ + fb_info->fix.reserved[0] = 0x5444; + fb_info->fix.reserved[1] = 0x5055; + + /* + * This preloads the value so that if userspace doesn't + * change it, it will be a full update + */ fb_info->var.reserved[0] = 0x54445055; fb_info->var.reserved[1] = 0; fb_info->var.reserved[2] = (uint16_t)msmfb->xres | -- Sent by an employee of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/