From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 88BEFC433FF for ; Fri, 9 Aug 2019 08:32:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 665792166E for ; Fri, 9 Aug 2019 08:32:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405826AbfHIIcz (ORCPT ); Fri, 9 Aug 2019 04:32:55 -0400 Received: from lb2-smtp-cloud8.xs4all.net ([194.109.24.25]:55857 "EHLO lb2-smtp-cloud8.xs4all.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726059AbfHIIcy (ORCPT ); Fri, 9 Aug 2019 04:32:54 -0400 Received: from [IPv6:2001:983:e9a7:1:a042:9da:6cf5:9cb5] ([IPv6:2001:983:e9a7:1:a042:9da:6cf5:9cb5]) by smtp-cloud8.xs4all.net with ESMTPA id w0KGhZ768qTdhw0KHhUIPC; Fri, 09 Aug 2019 10:32:52 +0200 To: Linux Media Mailing List , dmaengine@vger.kernel.org Cc: Vinod Koul , Peter Ujfalusi , Laurent Pinchart , Mauro Carvalho Chehab From: Hans Verkuil Subject: [PATCHv2] omap-dma/omap_vout_vrfb: fix off-by-one fi value Message-ID: <952e7f51-f208-9333-6f58-b7ed20d2ea0b@xs4all.nl> Date: Fri, 9 Aug 2019 10:32:40 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-CMAE-Envelope: MS4wfGBHksXKv+i7JHE9cu112c8cGY7ctVJUw0pW0Bt3iAVUUkdCDjMSRv3o+ys1hJAB9v2cbfIWCaU3yBEIRuQ5AqQbu3lHdi4PCQplnlLwdL4++vFJOu8n UDlH1nHvh8em4OIHRDM927TN7mcd0KiMS2RGDCgcfsID62xn9OBqlD849zSgelMMl+1Xz5eKSVbPrj572sLvxyqiMWtbBCzYqI9Mp4WzHHr2j2jNeiUAPmXL Xx6Fvh3rzFfQw15XEzNddY8MZcYXGF2pj2BU8iyB/psd/r2QoeSgjG6P/mC9NwjSYS5KV0f3qwkrbhhzC1Gt+kyrqTFQqLa+bMk8ld5sSvi00Lfodm5CiBEK hgjJzwJguYcNF48Sy8hErtLqRsrhQbbC2RK3tcMoD8c3dNO6fUUnCQ6+FHfiXrAk8x9+aJF3qvuAzd3/0p1+EkyrDMLgoA== Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org The OMAP 4 TRM specifies that when using double-index addressing the address increases by the ES plus the EI value minus 1 within a frame. When a full frame is transferred, the address increases by the ES plus the frame index (FI) value minus 1. The omap-dma code didn't account for the 'minus 1' in the FI register. To get correct addressing, add 1 to the src_icg value. This was found when testing a hacked version of the media m2m-deinterlace.c driver on a Pandaboard. The only other source that uses this feature is omap_vout_vrfb.c, and that adds a + 1 when setting the dst_icg. This is a workaround for the broken omap-dma.c behavior. So remove the workaround at the same time that we fix omap-dma.c. I tested the omap_vout driver with a Beagle XM board to check that the '+ 1' in omap_vout_vrfb.c was indeed a workaround for the omap-dma bug. Signed-off-by: Hans Verkuil Reviewed-by: Laurent Pinchart Acked-by: Peter Ujfalusi --- Changes since v1: removed unnecessary parenthesis in omap_vout_vrfb.c as suggested by Laurent. It makes sense that this patch goes in through the dmaengine subsystem (Mauro, can you Ack this patch?), but if preferred it can also go in through the media subsystem if we get an Ack from Vinod. --- drivers/dma/ti/omap-dma.c | 4 ++-- drivers/media/platform/omap/omap_vout_vrfb.c | 3 +-- 2 files changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/dma/ti/omap-dma.c b/drivers/dma/ti/omap-dma.c index ba2489d4ea24..ba27802efcd0 100644 --- a/drivers/dma/ti/omap-dma.c +++ b/drivers/dma/ti/omap-dma.c @@ -1234,7 +1234,7 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_interleaved( if (src_icg) { d->ccr |= CCR_SRC_AMODE_DBLIDX; d->ei = 1; - d->fi = src_icg; + d->fi = src_icg + 1; } else if (xt->src_inc) { d->ccr |= CCR_SRC_AMODE_POSTINC; d->fi = 0; @@ -1249,7 +1249,7 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_interleaved( if (dst_icg) { d->ccr |= CCR_DST_AMODE_DBLIDX; sg->ei = 1; - sg->fi = dst_icg; + sg->fi = dst_icg + 1; } else if (xt->dst_inc) { d->ccr |= CCR_DST_AMODE_POSTINC; sg->fi = 0; diff --git a/drivers/media/platform/omap/omap_vout_vrfb.c b/drivers/media/platform/omap/omap_vout_vrfb.c index 29e3f5da59c1..11ec048929e8 100644 --- a/drivers/media/platform/omap/omap_vout_vrfb.c +++ b/drivers/media/platform/omap/omap_vout_vrfb.c @@ -253,8 +253,7 @@ int omap_vout_prepare_vrfb(struct omap_vout_device *vout, */ pixsize = vout->bpp * vout->vrfb_bpp; - dst_icg = ((MAX_PIXELS_PER_LINE * pixsize) - - (vout->pix.width * vout->bpp)) + 1; + dst_icg = MAX_PIXELS_PER_LINE * pixsize - vout->pix.width * vout->bpp; xt->src_start = vout->buf_phy_addr[vb->i]; xt->dst_start = vout->vrfb_context[vb->i].paddr[0]; -- 2.20.1