From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id BC5A7266B46; Mon, 20 Jul 2026 21:42:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784583745; cv=none; b=hdeZpi1nRS7PDWJiHE5j7wy6hZNOxgrUZYsNVEYx6FN0ACvBcS2PfPTGXeo8kMuC/yScPuI4+Bst4dtod03rmJHoQ2xR8ZLUkliYn9piFjgasbTgEKM8MQNkWKl1pXSSX9p2VVe1Io7d0Ry1px0hMX2PIs4uI5Ht2efKowMb4/Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784583745; c=relaxed/simple; bh=7GPCEpWSp6hdvoiZp/dWDlRlQZkpNncKgtqSVs5WpVQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=lwD+eHg7gOM+2Hflg2n8rXRfXkDYWKSdsGAT8zq1lQ88zzQzL9f10hXg30zTWJVMotQEzYlWSSDPpRXxKZFmaTKiQ+9cv9ONjv2gbVLG/Q0KN+58jsrN1dQXUhwLTnD/Lrdo2rXF068ggICBaBVPx+aCYOoOiON8Ds9jCaGU3W0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=l8iAgLJz; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="l8iAgLJz" 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 A3366143D; Mon, 20 Jul 2026 14:42:17 -0700 (PDT) Received: from ryzen.fritz.box (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9DC563F66F; 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: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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"; }; -- 2.46.4