Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Philippe Schenker <dev@pschenker.ch>
To:     marcel.ziswiler@toradex.com, max.krummenacher@toradex.com,
        stefan@agner.ch, devicetree@vger.kernel.org,
        Rob Herring <robh+dt@kernel.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>
Cc:     Stefan Agner <stefan.agner@toradex.com>,
        Philippe Schenker <philippe.schenker@toradex.com>,
        Fabio Estevam <festevam@gmail.com>,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        NXP Linux Team <linux-imx@nxp.com>,
        Sascha Hauer <s.hauer@pengutronix.de>
Subject: [PATCH 02/22] ARM: dts: imx7-colibri: disable HS400
Date:   Tue, 30 Jul 2019 16:46:29 +0200
Message-Id: <20190730144649.19022-3-dev@pschenker.ch>
In-Reply-To: <20190730144649.19022-1-dev@pschenker.ch>
References: <20190730144649.19022-1-dev@pschenker.ch>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Stefan Agner <stefan.agner@toradex.com>

Force HS200 by masking bit 63 of the SDHCI capability register.
The i.MX ESDHC driver uses SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400. With
that the stack checks bit 63 to descide whether HS400 is available.
Using sdhci-caps-mask allows to mask bit 63. The stack then selects
HS200 as operating mode.

This prevents rare communication errors with minimal effect on
performance:
	sdhci-esdhc-imx 30b60000.usdhc: warning! HS400 strobe DLL
		status REF not lock!

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
---

 arch/arm/boot/dts/imx7-colibri.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/imx7-colibri.dtsi b/arch/arm/boot/dts/imx7-colibri.dtsi
index f1c1971f2160..f7c9ce5bed47 100644
--- a/arch/arm/boot/dts/imx7-colibri.dtsi
+++ b/arch/arm/boot/dts/imx7-colibri.dtsi
@@ -325,6 +325,7 @@
 	vmmc-supply = <&reg_module_3v3>;
 	vqmmc-supply = <&reg_DCDC3>;
 	non-removable;
+	sdhci-caps-mask = <0x80000000 0x0>;
 };
 
 &iomuxc {
-- 
2.22.0