Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752259Ab1CUNnr (ORCPT ); Mon, 21 Mar 2011 09:43:47 -0400 Received: from mail-ew0-f46.google.com ([209.85.215.46]:34376 "EHLO mail-ew0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751176Ab1CUNnp (ORCPT ); Mon, 21 Mar 2011 09:43:45 -0400 Message-ID: <4D8755AD.3060402@ru.mvista.com> Date: Mon, 21 Mar 2011 16:42:05 +0300 From: Sergei Shtylyov User-Agent: Thunderbird 2.0.0.21 (X11/20090320) MIME-Version: 1.0 To: Carl Vanderlip CC: David Brown , Daniel Walker , Bryan Huntsman , linux-fbdev@vger.kernel.org, Brian Swetland , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Colin Cross , Rebecca Schultz Zavin , Dima Zavin , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 18/20] video: msm: Prevent DMA lockups when switching bit depths References: <1300484846-26393-1-git-send-email-carlv@codeaurora.org> <1300485585-27640-1-git-send-email-carlv@codeaurora.org> In-Reply-To: <1300485585-27640-1-git-send-email-carlv@codeaurora.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1555 Lines: 45 Hello. Carl Vanderlip wrote: > 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. Maybe I'm blind again but I don't see any waiting... > 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); WBR, Sergei -- 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/