From patchwork Mon Jul 20 21:38:32 2026 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andre Przywara X-Patchwork-Id: 2698 Return-Path: X-Original-To: noreply@patchwork.local Delivered-To: noreply@patchwork.local Received: from sea.lore.kernel.org (sea.lore.kernel.org [172.234.253.10]) by mxe881.netcup.net (Postfix) with ESMTPS id 9D4141C2B79 for ; Mon, 20 Jul 2026 23:43:00 +0200 (CEST) Authentication-Results: mxe881; dkim=pass header.d=arm.com; spf=pass (sender IP is 172.234.253.10) smtp.mailfrom=linux-sunxi+bounces-24552-noreply=patchwork.local@lists.linux.dev smtp.helo=sea.lore.kernel.org Received-SPF: pass (mxe881: domain of lists.linux.dev designates 172.234.253.10 as permitted sender) client-ip=172.234.253.10; envelope-from=linux-sunxi+bounces-24552-noreply=patchwork.local@lists.linux.dev; helo=sea.lore.kernel.org; Received: from smtp.subspace.kernel.org (conduit.subspace.kernel.org [100.90.174.1]) by sea.lore.kernel.org (Postfix) with ESMTP id DA609304569F for ; 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Mon, 20 Jul 2026 14:42:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1784583741; bh=7GPCEpWSp6hdvoiZp/dWDlRlQZkpNncKgtqSVs5WpVQ=; h=From:To:Cc:Subject:Date:From; b=l8iAgLJzV7Gh3mwE/JMxyp/TMqv1GUgNiObXadU2jzw1/5vwKGwxnPdQewXZ9dYDu WjFH5fDtXjJQN8vlY6tcX3U9ypgFZk1wmHI8SjrQSnCnB7AGmkgjh6OmhIOtWeLD24 /eUxAXDjbLj0L+RW23StDNOoNAUYlriflwcAUjpE= From: Andre Przywara To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH] arm64: dts: allwinner: a523: x96qpro+: overvolting eMMC Date: Mon, 20 Jul 2026 23:38:32 +0200 Message-ID: <20260720213832.3763-1-andre.przywara@arm.com> X-Mailer: git-send-email 2.46.4 Precedence: bulk X-Mailing-List: linux-sunxi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Rspamd-Server: rspamd-worker-8404 X-Spamd-Result: default: False [-0.66 / 15.00]; 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ARC_ALLOW(0.00)[subspace.kernel.org:s=arc-20240116:i=1]; RCVD_TLS_LAST(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[] X-Rspamd-Queue-Id: 9D4141C2B79 X-MORS-Enabled: yes X-MORS-DOMAIN: patchwork.local X-MORS-HOSTING: hosting172546 X-MORS-USER: hosting172546 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= On the X96QPro+ TV box, the eMMC wasn't working properly: the chip would be detected, but most requests failed, leaving it unusable. Some "solutions" were circulating downstream, one "popular" one is severely limiting the clock frequency, with a drastic performance impact. Instead slightly bumping the I/O voltage on PortC from the canonical 1.8V to 1.9V seemed to do the trick: the eMMC now works and reaches the expected 120MB/s performance. Adjust the respective regulator voltage in the .dts to enable eMMC operation on that device. Signed-off-by: Andre Przywara --- Hi, I am not super happy with this patch, but it seems to be a pragmatic and the least hacky solution I have seen. Cheers, Andre arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts b/arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts index a96927fbdadd5..5636e95312218 100644 --- a/arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts +++ b/arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts @@ -194,8 +194,8 @@ reg_bldo4: bldo4 { reg_cldo1: cldo1 { regulator-always-on; - regulator-min-microvolt = <1800000>; - regulator-max-microvolt = <1800000>; + regulator-min-microvolt = <1900000>; + regulator-max-microvolt = <1900000>; regulator-name = "vcc-codec-sd"; };