From patchwork Fri Jun 19 14:30:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 223937 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 ACF4CC433E0 for ; Fri, 19 Jun 2020 15:56:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 89F2220809 for ; Fri, 19 Jun 2020 15:56:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592582212; bh=FmZBpMkmKEa+BWw2RykpSg1I5MeKBmsg8bPHuXEZEK8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=iUEcXpPgCxqRUrNBC3l1Jx5lkZtMDHvhnvobdYDfNTmjCo8nJY9aWHCk3BE+GpJjs +/8IvoJmiYrUm2rE0KoeL2MC94yA+tpf7fOcSWBiATdfUSxmDZFlLXGEQLBH3GqV1O 0t6l485yT+uor1JsE+beKGWSDLJPYxFSwZO3+PlU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392759AbgFSPUw (ORCPT ); Fri, 19 Jun 2020 11:20:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:52162 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392754AbgFSPUv (ORCPT ); Fri, 19 Jun 2020 11:20:51 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1B75120706; Fri, 19 Jun 2020 15:20:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592580050; bh=FmZBpMkmKEa+BWw2RykpSg1I5MeKBmsg8bPHuXEZEK8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EQg8oztfttqT6KFLEYPg5syx0nsNs1KNVpXktD6tYVvsCDR7EkWZxPMbJQzV5S2nB 910FXI57qKt9mf0D0fVezUKfDBMk40G3RDa+WN6bvAJJQ5K9FncrMnQCV/eL09pQL6 mQbWaedEdxnNTq6DkUCFPUjmts8Xi8rwkOR0sjlE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Geert Uytterhoeven , Kieran Bingham , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 5.7 103/376] media: platform: fcp: Set appropriate DMA parameters Date: Fri, 19 Jun 2020 16:30:21 +0200 Message-Id: <20200619141715.222785776@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200619141710.350494719@linuxfoundation.org> References: <20200619141710.350494719@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Kieran Bingham [ Upstream commit dd844fb8e50b12e65bbdc5746c9876c6735500df ] Enabling CONFIG_DMA_API_DEBUG=y and CONFIG_DMA_API_DEBUG_SG=y will enable extra validation on DMA operations ensuring that the size restraints are met. When using the FCP in conjunction with the VSP1/DU, and display frames, the size of the DMA operations is larger than the default maximum segment size reported by the DMA core (64K). With the DMA debug enabled, this produces a warning such as the following: "DMA-API: rcar-fcp fea27000.fcp: mapping sg segment longer than device claims to support [len=3145728] [max=65536]" We have no specific limitation on the segment size which isn't already handled by the VSP1/DU which actually handles the DMA allcoations and buffer management, so define a maximum segment size of up to 4GB (a 32 bit mask). Reported-by: Geert Uytterhoeven Fixes: 7b49235e83b2 ("[media] v4l: Add Renesas R-Car FCP driver") Signed-off-by: Kieran Bingham Reviewed-by: Geert Uytterhoeven Tested-by: Geert Uytterhoeven Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/platform/rcar-fcp.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/media/platform/rcar-fcp.c b/drivers/media/platform/rcar-fcp.c index 43c78620c9d8..5c6b00737fe7 100644 --- a/drivers/media/platform/rcar-fcp.c +++ b/drivers/media/platform/rcar-fcp.c @@ -8,6 +8,7 @@ */ #include +#include #include #include #include @@ -21,6 +22,7 @@ struct rcar_fcp_device { struct list_head list; struct device *dev; + struct device_dma_parameters dma_parms; }; static LIST_HEAD(fcp_devices); @@ -136,6 +138,9 @@ static int rcar_fcp_probe(struct platform_device *pdev) fcp->dev = &pdev->dev; + fcp->dev->dma_parms = &fcp->dma_parms; + dma_set_max_seg_size(fcp->dev, DMA_BIT_MASK(32)); + pm_runtime_enable(&pdev->dev); mutex_lock(&fcp_lock);