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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C3EFDD1680B for ; Fri, 9 Jan 2026 10:52:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=dvijv8uUpBbSdpjrMPdUmY9MqFhbG/70BQyKWf7xOy0=; b=Ausibs6iLiqPaulO9MQg8QJxYS Ku1duhSKbWQgnpdnF9OZn3i+xIhFv4k7yr2iaMUDZahetytT0+N6PTcQeg10cwbMtSdce0tl62jVy Yn+iITe+9ZfJz37ykMsDkpN+I1apJnCexCFvwHezJ/OdyDxn/YrjQsewz0gL5e8nrPihMgMnQsO4T 3ck/3AXeJi26kWGHAr6tV29itDGEcFCTDxojp7xTIXtxeaieXjKhJ2YTgE8CFFBwDEON0rDXeZr/I P9Lr9QAAX78OQuWl36Up3wAbU3zA0Wa53r0uUqi1T0QxjdNTIRGTvJYpHX5iMJTIs52weROLiBE1a ZZWFeLaA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1veA6B-00000002A9u-2GyS; Fri, 09 Jan 2026 10:52:07 +0000 Received: from gloria.sntech.de ([185.11.138.130]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1veA66-00000002A7H-2MUE; Fri, 09 Jan 2026 10:52:03 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sntech.de; s=gloria202408; h=Content-Type:Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Reply-To; bh=dvijv8uUpBbSdpjrMPdUmY9MqFhbG/70BQyKWf7xOy0=; b=F2KAnBkXKhmjoyFSFhoLcIB1UY YlCl4a0i0k1Wkn2OjubQVUv8d7+hFouwIXlum5Ezf2sRdpqCkY8IyXh0PAwQcPZ1lirsjgoijnPkg 1pnRsYycmZl6sPlJvGAOtI1QTl0QWfPUJELoUVkF8jbjK8Wep1cjWOkuH7JZMtaCOaNo6IdJTW020 vI9Ar+E61U5+tYIOtA9SmMJTfulOUDICm70jtb7QlkyM6HWXmtRrm8KoQAvx2lzFj1/5ES7gMncuS v+NyVWPBuD/5gg0Uxq4wJLYzLzWu54FHveuh1SX8T+XioojSCo6JGN0KAfVhBjDbb2CWVbEw5wbk0 kb4WV4Dw==; Received: from i53875b6d.versanet.de ([83.135.91.109] helo=diego.localnet) by gloria.sntech.de with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1veA5t-001cZG-Ra; Fri, 09 Jan 2026 11:51:50 +0100 From: Heiko =?UTF-8?B?U3TDvGJuZXI=?= To: Neil Armstrong , Jessica Zhang , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sandy Huang , Andy Yan , Vinod Koul , Kishon Vijay Abraham I , Chaoyi Chen , Chaoyi Chen Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-phy@lists.infradead.org Subject: Re: [PATCH 8/9] drm/rockchip: Drop ROCKCHIP_IOMMU depend for DRM_ROCKCHIP Date: Fri, 09 Jan 2026 11:51:49 +0100 Message-ID: <2629918.TLnPLrj5Ze@diego> In-Reply-To: <4e01f121-1912-4897-98e8-cb543a501707@rock-chips.com> References: <20251106020632.92-1-kernel@airkyi.com> <4072834.X9hSmTKtgW@phil> <4e01f121-1912-4897-98e8-cb543a501707@rock-chips.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260109_025202_652665_BB302895 X-CRM114-Status: GOOD ( 25.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, Am Freitag, 9. Januar 2026, 02:26:00 Mitteleurop=C3=A4ische Normalzeit schr= ieb Chaoyi Chen: > On 1/9/2026 3:03 AM, Heiko Stuebner wrote: > > Am Donnerstag, 6. November 2025, 03:06:31 Mitteleurop=C3=A4ische Normal= zeit schrieb Chaoyi Chen: > >> From: Chaoyi Chen > >> > >> On the RK3506 platform, there is no iommu hardware. And even on > >> platform that have iommu hardware, it should be possible to use > >> VOP without enabling iommu. In this case, a contiguous memory > >> space like CMA should be used. > >> > >> So this patch removes the dependency on ROCKCHIP_IOMMU. > >> > >> Signed-off-by: Chaoyi Chen > >> --- > >> drivers/gpu/drm/rockchip/Kconfig | 3 ++- > >> 1 file changed, 2 insertions(+), 1 deletion(-) > >> > >> diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockch= ip/Kconfig > >> index b7b025814e72..a056d419190c 100644 > >> --- a/drivers/gpu/drm/rockchip/Kconfig > >> +++ b/drivers/gpu/drm/rockchip/Kconfig > >> @@ -1,7 +1,8 @@ > >> # SPDX-License-Identifier: GPL-2.0-only > >> config DRM_ROCKCHIP > >> tristate "DRM Support for Rockchip" > >> - depends on DRM && ROCKCHIP_IOMMU > >> + depends on DRM > >> + depends on ROCKCHIP_IOMMU || !ROCKCHIP_IOMMU > >=20 > > I don't really understand this yes+no line :-) > >=20 > > Can't you just > > - drop the dependency altogether > > or > > - do a depends on ROCKCHIP_IOMMU if ARM64 > >=20 > > >=20 > This trick is called optional-dependencies [0]. In addition to the=20 > familiar depends on ROCKCHIP_IOMMU part, the newly added !ROCKCHIP_IOMMU > ensures that DRM_ROCKCHIP can still be built even when ROCKCHIP_IOMMU > is not build. >=20 > [0]: https://docs.kernel.org/kbuild/kconfig-language.html#optional-depend= encies thanks a lot for pointing me to this nifty feature :-) Heiko