Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932893Ab1CRWAG (ORCPT ); Fri, 18 Mar 2011 18:00:06 -0400 Received: from wolverine01.qualcomm.com ([199.106.114.254]:8037 "EHLO wolverine01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932830Ab1CRV7t (ORCPT ); Fri, 18 Mar 2011 17:59:49 -0400 X-IronPort-AV: E=McAfee;i="5400,1158,6289"; a="80850569" X-IronPort-AV: E=Sophos;i="4.63,205,1299484800"; d="scan'208";a="37045069" From: Carl Vanderlip To: David Brown , Daniel Walker , Bryan Huntsman Cc: Brian Swetland , Dima Zavin , Rebecca Schultz Zavin , Colin Cross , linux-fbdev@vger.kernel.org, Carl Vanderlip , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 18/20] video: msm: Prevent DMA lockups when switching bit depths Date: Fri, 18 Mar 2011 14:59:45 -0700 Message-Id: <1300485585-27640-1-git-send-email-carlv@codeaurora.org> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1300484846-26393-1-git-send-email-carlv@codeaurora.org> References: <1300484846-26393-1-git-send-email-carlv@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1535 Lines: 41 Forces the lcdc off and waits a frame vsync period to prevent the MDP DMA engine crashing if the DMA bit depth is changed. A sleep cannot be used because lcdc_dma_start is called in irq context. Authors: Dima Zavin Rebecca Schultz Zavin Colin Cross Signed-off-by: Carl Vanderlip --- drivers/video/msm/mdp.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/video/msm/mdp.c b/drivers/video/msm/mdp.c index b3f334ad..49d956a 100644 --- a/drivers/video/msm/mdp.c +++ b/drivers/video/msm/mdp.c @@ -564,6 +564,13 @@ void mdp_hw_init(struct mdp_info *mdp) mdp_writel(mdp, 1, 0x60); mdp_writel(mdp, 1, MDP_EBI2_PORTMAP_MODE); + /* disable lcdc */ + mdp_writel(mdp, 0, MDP_LCDC_CTL); + /* enable auto clock gating for all blocks by default */ + mdp_writel(mdp, 0xffffffff, MDP_CGC_EN); + /* reset color/gamma correct parms */ + mdp_writel(mdp, 0, MDP_DMA_P_COLOR_CORRECT_CONFIG); + mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x01f8); mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x01fc); mdp_writel(mdp, 1, 0x60); -- 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/