linux-kernel - [PATCH] arm64: dts: qcom: kitakami: Temporarily disable SDHCI1

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Date:   Fri, 14 Aug 2020 17:47:49 +0200
From:   Konrad Dybcio <konradybcio@...il.com>
To:     ~postmarketos/upstreaming@...ts.sr.ht
Cc:     Konrad Dybcio <konradybcio@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: qcom: kitakami: Temporarily disable SDHCI1

There is an issue with Kitakami eMMCs dying when a quirk
isn't addressed. Until that happens, disable it.

Signed-off-by: Konrad Dybcio <konradybcio@...il.com>
---
This supersides my previous "mmc: host: msm: Add optional full power cycle property."
series in which I incorrectly addressed the issue NOT solving the cause.

 arch/arm64/boot/dts/qcom/msm8994-sony-xperia-kitakami.dtsi | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/msm8994-sony-xperia-kitakami.dtsi b/arch/arm64/boot/dts/qcom/msm8994-sony-xperia-kitakami.dtsi
index 30cb3aa7d734..5496590dee33 100644
--- a/arch/arm64/boot/dts/qcom/msm8994-sony-xperia-kitakami.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8994-sony-xperia-kitakami.dtsi
@@ -428,7 +428,12 @@ pmi8994_bby: boost-bypass {
 };
 
 &sdhc1 {
-	status = "okay";
+	/* There is an issue with the eMMC causing permanent
+	 * damage to the card if a quirk isn't addressed.
+	 * Until it's fixed, disable the MMC so as not to brick
+	 * devices.
+	 */
+	status = "disabled";
 
 	/* Downstream pushes 2.95V to the sdhci device,
 	 * but upstream driver REALLY wants to make vmmc 1.8v
-- 
2.28.0