Received: by 2002:a05:6a10:f3d0:0:0:0:0 with SMTP id a16csp3360848pxv; Mon, 28 Jun 2021 02:55:52 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwboRONV+h7oj47kYoJA2uPt6RXGkrqtxTgI3XRdfnoRTqs08gE0JUmMqyAxLAaFE8Q6kCJ X-Received: by 2002:a17:906:1284:: with SMTP id k4mr15528406ejb.25.1624874151574; Mon, 28 Jun 2021 02:55:51 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1624874151; cv=none; d=google.com; s=arc-20160816; b=SPdy9nRBYtLRfEm/gvSYTpE7oYnkIbjOQK20vNWMj3Sj0psUNbrMS6H1o2bCOMb1aq 8EP5HCBW97lhfqCuQfJT9H3n3XPn/15iTlAQX1Dg0vLjuBl906ixH/2Q/x8EE8ky9TTA cESdmmcpYhESi8zQ/qEP3Xm7qYOdLXO6UHPfh0UI11m3t1dKDIkCBYHrxH4NiCYe1Rqo nAgBq1AF9LaogrGnz+wZVFj7RdYXPJrIfk+cKPD+GhMxzBlBmhhpUh/uTiJ5ajHlsRjz EROaBT0uDVpRyvxa27iLUTucdYYWMyhOqIiY1TAwld4vivYM4mBrvtB5mGevIn4xcR0n Nr4Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:content-language :in-reply-to:mime-version:user-agent:date:message-id:from:references :cc:to:subject; bh=ts2xwhQ0CXsrhSpIgI/m6Z9qa1YpGGit9PTrqnm+dZA=; b=i7YkCVVA0B0FtxcMXWsy0jOyQshJuG8IaFTKhltDj5IwpoTmWuA7+nlqgKYSPHS94J NjbohW50aG+Vsxx9Qfiz3uFz4qrgjGaL9VFO7lANLpIQ3bOkDbnJCnKtocCv/fQhgRfe iJql2FWUOGTXGARtu/msOC604fwIGcyBE8bg25vrBG7D4hLLQV+wMP/y9vdHFkQh1K8s G79QF81SZFcdJqDiNQq0YlN+z45PwVs45PrtiLW0xk2qS9rFfGx2+A1rsw+8/4Chjw4e DD5X8EJ5H7zuQvR4reUl2Hi3WuJ2omRWl1Cmwe3fLUmGgoJjcoNNwj8N+FOMnJD6fgpp Vvlw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=arm.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id q17si13186194edt.177.2021.06.28.02.55.29; Mon, 28 Jun 2021 02:55:51 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=arm.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232591AbhF1J4y (ORCPT + 99 others); Mon, 28 Jun 2021 05:56:54 -0400 Received: from foss.arm.com ([217.140.110.172]:55342 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232512AbhF1J4y (ORCPT ); Mon, 28 Jun 2021 05:56:54 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9AEA41FB; Mon, 28 Jun 2021 02:54:28 -0700 (PDT) Received: from [10.57.8.89] (unknown [10.57.8.89]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 862B33F694; Mon, 28 Jun 2021 02:54:27 -0700 (PDT) Subject: Re: [PATCH] drm/rockchip: Check iommu itself instead of it's parent for device_is_available To: Andy Yan , hjc@rock-chips.com, heiko@sntech.de, dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20210627084737.309163-1-andy.yan@rock-chips.com> From: Robin Murphy Message-ID: <66fb4977-4e6f-f7ed-0dac-18710ebd782a@arm.com> Date: Mon, 28 Jun 2021 10:54:21 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <20210627084737.309163-1-andy.yan@rock-chips.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021-06-27 09:47, Andy Yan wrote: > When iommu itself is disabled in dts, we should > fallback to non-iommu buffer, check iommu parent > is meanless here. > > Signed-off-by: Andy Yan > --- > > drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c > index 212bd87c0c4a..0d20c8cc1ffa 100644 > --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c > +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c > @@ -366,7 +366,7 @@ static int rockchip_drm_platform_of_probe(struct device *dev) > } > > iommu = of_parse_phandle(port->parent, "iommus", 0); > - if (!iommu || !of_device_is_available(iommu->parent)) { > + if (!iommu || !of_device_is_available(iommu)) { Just wondering, could you use device_iommu_mapped() to avoid poking at the DT at all here, or is it that you need to check remote graph endpoints whose struct device may not be ready yet? Robin. > DRM_DEV_DEBUG(dev, > "no iommu attached for %pOF, using non-iommu buffers\n", > port->parent); >