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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21880C4332F for ; Wed, 9 Mar 2022 16:26:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235534AbiCIQ1f (ORCPT ); Wed, 9 Mar 2022 11:27:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42370 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235821AbiCIQ0F (ORCPT ); Wed, 9 Mar 2022 11:26:05 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C333F154D34; Wed, 9 Mar 2022 08:22:15 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 453CD6194A; Wed, 9 Mar 2022 16:22:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 016E0C340EC; Wed, 9 Mar 2022 16:22:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1646842934; bh=IO6UVDaLq4MGTBRCBzhs46Izu0yxbl4fllpUsoEd0ho=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=psoA3LJagQJz1qu+p72nsOd2vS9Ep+20VrLmF/9gQqrU9CgM0gaQugDQVAZHx12jN xQFDPUNjdRmXbjsiLdMv7AHk75ypBTIy75aORlIGKG2WVF5sVdYTZLo4n7l75KVZCk HOwItaNa8oGfpHFnQGWEzJybkyMNCLtqw33AZ1bIWruQqs0cG4hgFBSOjXHQuMoFm0 hs3jTQwACMyAwHn5m9qgga89kqMxWBoXZ5jeepQmd9ncKc5UK4uTSauWZ16FZwKq1Q mEHDnIouoNPQ67m5zFnWXlZ9UaAxzePcHRHgdEnpaq3xARlxnZWMFOCM6ddNEQWujP 1Z0wHmRPHoqWA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jakob Unterwurzacher , Quentin Schulz , Quentin Schulz , Heiko Stuebner , Sasha Levin , robh+dt@kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org Subject: [PATCH AUTOSEL 5.10 03/20] arm64: dts: rockchip: fix rk3399-puma eMMC HS400 signal integrity Date: Wed, 9 Mar 2022 11:21:41 -0500 Message-Id: <20220309162158.136467-3-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220309162158.136467-1-sashal@kernel.org> References: <20220309162158.136467-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Jakob Unterwurzacher [ Upstream commit 62966cbdda8a92f82d966a45aa671e788b2006f7 ] There are signal integrity issues running the eMMC at 200MHz on Puma RK3399-Q7. Similar to the work-around found for RK3399 Gru boards, lowering the frequency to 100MHz made the eMMC much more stable, so let's lower the frequency to 100MHz. It might be possible to run at 150MHz as on RK3399 Gru boards but only 100MHz was extensively tested. Cc: Quentin Schulz Signed-off-by: Jakob Unterwurzacher Signed-off-by: Quentin Schulz Link: https://lore.kernel.org/r/20220119134948.1444965-1-quentin.schulz@theobroma-systems.com Signed-off-by: Heiko Stuebner Signed-off-by: Sasha Levin --- arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi index 4660416c8f38..544110aaffc5 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi @@ -472,6 +472,12 @@ vcc5v0_host_en: vcc5v0-host-en { }; &sdhci { + /* + * Signal integrity isn't great at 200MHz but 100MHz has proven stable + * enough. + */ + max-frequency = <100000000>; + bus-width = <8>; mmc-hs400-1_8v; mmc-hs400-enhanced-strobe; -- 2.34.1