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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT 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 D8AADC43381 for ; Thu, 7 Mar 2019 08:43:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 98D2220851 for ; Thu, 7 Mar 2019 08:43:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726442AbfCGInF (ORCPT ); Thu, 7 Mar 2019 03:43:05 -0500 Received: from vegas.theobroma-systems.com ([144.76.126.164]:55809 "EHLO mail.theobroma-systems.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726237AbfCGInE (ORCPT ); Thu, 7 Mar 2019 03:43:04 -0500 Received: from ip092042140082.rev.nessus.at ([92.42.140.82]:54490 helo=purcell.lan) by mail.theobroma-systems.com with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1h1obY-000810-Qy; Thu, 07 Mar 2019 09:42:16 +0100 From: Christoph Muellner To: robh+dt@kernel.org, mark.rutland@arm.com, heiko@sntech.de, shawn.lin@rock-chips.com Cc: Christoph Muellner , Philipp Tomsich , Kishon Vijay Abraham I , Douglas Anderson , Brian Norris , Klaus Goger , Enric Balletbo i Serra , Viresh Kumar , Matthias Brugger , Jeffy Chen , Randy Li , Tony Xie , Vicente Bergas , Ezequiel Garcia , Lin Huang , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org Subject: [PATCH v2 4/4] arm64: dts: rockchip: Decrease emmc-phy's drive impedance on rk3399-puma Date: Thu, 7 Mar 2019 09:41:56 +0100 Message-Id: <20190307084159.25236-4-christoph.muellner@theobroma-systems.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190307084159.25236-1-christoph.muellner@theobroma-systems.com> References: <20190307084159.25236-1-christoph.muellner@theobroma-systems.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The RK3399-Q7 (Puma) requires 33 Ohm drive strength to ensure signal integrity at HS-400 (200MHz clock, DDR signalling). A repeated EMC testing run validates that this increase does not negatively impact EMC compliance (emissions have ample distance to the regulatory limits). Signed-off-by: Christoph Muellner Signed-off-by: Philipp Tomsich Tested-by: Jakob Unterwurzacher Tested-by: Klaus Goger --- arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi index 0130b9f98c9d..4f75bb6b2f14 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi @@ -146,6 +146,7 @@ &emmc_phy { status = "okay"; + drive-impedance-ohm = <33>; }; &gmac { -- 2.11.0 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Muellner Subject: [PATCH v2 4/4] arm64: dts: rockchip: Decrease emmc-phy's drive impedance on rk3399-puma Date: Thu, 7 Mar 2019 09:41:56 +0100 Message-ID: <20190307084159.25236-4-christoph.muellner@theobroma-systems.com> References: <20190307084159.25236-1-christoph.muellner@theobroma-systems.com> Return-path: In-Reply-To: <20190307084159.25236-1-christoph.muellner@theobroma-systems.com> Sender: linux-kernel-owner@vger.kernel.org To: robh+dt@kernel.org, mark.rutland@arm.com, heiko@sntech.de, shawn.lin@rock-chips.com Cc: Christoph Muellner , Philipp Tomsich , Kishon Vijay Abraham I , Douglas Anderson , Brian Norris , Klaus Goger , Enric Balletbo i Serra , Viresh Kumar , Matthias Brugger , Jeffy Chen , Randy Li , Tony Xie , Vicente Bergas , Ezequiel Garcia , Lin Huang , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.o List-Id: devicetree@vger.kernel.org The RK3399-Q7 (Puma) requires 33 Ohm drive strength to ensure signal integrity at HS-400 (200MHz clock, DDR signalling). A repeated EMC testing run validates that this increase does not negatively impact EMC compliance (emissions have ample distance to the regulatory limits). Signed-off-by: Christoph Muellner Signed-off-by: Philipp Tomsich Tested-by: Jakob Unterwurzacher Tested-by: Klaus Goger --- arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi index 0130b9f98c9d..4f75bb6b2f14 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi @@ -146,6 +146,7 @@ &emmc_phy { status = "okay"; + drive-impedance-ohm = <33>; }; &gmac { -- 2.11.0 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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT 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 92675C43381 for ; Thu, 7 Mar 2019 08:43:28 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 5CA9F20835 for ; Thu, 7 Mar 2019 08:43:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="KZkM/qt5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5CA9F20835 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=theobroma-systems.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=y08/2QTuiW+EMJiZOWfpwetwQW/q2g2cVz+LxwcvcDI=; b=KZkM/qt5GItnV4sLxuBYq2iDUr GtrZ3CWvMUtBny7jCOZAp3/GFU6ys6Vp1yNlrzuxzXKbXnQIfn7XoyofAdDslx8N5L/kh1fp5NenX bwQp39UA27/NsVmKxmyqSefAG4ptFAHbrDtST5iwE4vVo4L6vMw+rB+/CbAuRh6SzpUvQOGWV2gbp dKwMUEAL2lKae1oJ4I91NXhbpROyNUWbUXa2tDiNxSmQJUEIC2R3Di1Za884F40BeW96mcntGWaf8 UCeq4VqH+LGrDYzDcw7oEGf97E+Pc5TtEsr+SwleUpSZA8tjuj5rnPa7YrmUV7XjUCcPkMRCOXPEL dBANa//g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1h1ocZ-0004O2-LQ; Thu, 07 Mar 2019 08:43:19 +0000 Received: from vegas.theobroma-systems.com ([144.76.126.164] helo=mail.theobroma-systems.com) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1h1ocK-0004Am-Rt; Thu, 07 Mar 2019 08:43:18 +0000 Received: from ip092042140082.rev.nessus.at ([92.42.140.82]:54490 helo=purcell.lan) by mail.theobroma-systems.com with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1h1obY-000810-Qy; Thu, 07 Mar 2019 09:42:16 +0100 From: Christoph Muellner To: robh+dt@kernel.org, mark.rutland@arm.com, heiko@sntech.de, shawn.lin@rock-chips.com Subject: [PATCH v2 4/4] arm64: dts: rockchip: Decrease emmc-phy's drive impedance on rk3399-puma Date: Thu, 7 Mar 2019 09:41:56 +0100 Message-Id: <20190307084159.25236-4-christoph.muellner@theobroma-systems.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190307084159.25236-1-christoph.muellner@theobroma-systems.com> References: <20190307084159.25236-1-christoph.muellner@theobroma-systems.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190307_004305_799267_5D0DE267 X-CRM114-Status: UNSURE ( 9.33 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Matthias Brugger , Lin Huang , Viresh Kumar , Brian Norris , Douglas Anderson , Vicente Bergas , Kishon Vijay Abraham I , linux-rockchip@lists.infradead.org, Jeffy Chen , Tony Xie , Klaus Goger , linux-arm-kernel@lists.infradead.org, Enric Balletbo i Serra , Randy Li , Philipp Tomsich , Ezequiel Garcia , linux-kernel@vger.kernel.org, Christoph Muellner MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org The RK3399-Q7 (Puma) requires 33 Ohm drive strength to ensure signal integrity at HS-400 (200MHz clock, DDR signalling). A repeated EMC testing run validates that this increase does not negatively impact EMC compliance (emissions have ample distance to the regulatory limits). Signed-off-by: Christoph Muellner Signed-off-by: Philipp Tomsich Tested-by: Jakob Unterwurzacher Tested-by: Klaus Goger --- arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi index 0130b9f98c9d..4f75bb6b2f14 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi @@ -146,6 +146,7 @@ &emmc_phy { status = "okay"; + drive-impedance-ohm = <33>; }; &gmac { -- 2.11.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel