From: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
To: Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>,
Abel Vesa <abelvesa@kernel.org>, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>
Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
Kamal Wadhwa <kamal.wadhwa@oss.qualcomm.com>,
Jishnu Prakash <jishnu.prakash@oss.qualcomm.com>,
Nitin Rawat <nitin.rawat@oss.qualcomm.com>,
Rakesh Kota <rakesh.kota@oss.qualcomm.com>
Subject: [PATCH v2] arm64: dts: qcom: shikra-iqs-som: Correct PM8150 L10 voltage range
Date: Tue, 29 Sep 2026 14:05:18 +0530 [thread overview]
Message-ID: <20260929-fix_l10_max-v2-1-2fccd87115e7@oss.qualcomm.com> (raw)
On Shikra IQS, the L10 rail supplies the SD card's VMMC. Its maximum
voltage must be limited to 3.3 V because the derived VQMMC voltage on
L2 supports up to approximately 3.3 V. Allowing VMMC to reach 3.544 V
can drive VQMMC beyond its supported range, potentially causing SD
bus bit errors and resulting in the voltage negotiation failure:
l2: unsupportable voltage range: 3500000-3296000uV
Reducing L10's maximum voltage to 3.3 V keeps both rails within their
supported operating ranges.
Co-developed-by: Nitin Rawat <nitin.rawat@oss.qualcomm.com>
Signed-off-by: Nitin Rawat <nitin.rawat@oss.qualcomm.com>
Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
---
Changes in v2:
- Update the commit message.
- Link to v1: https://patch.msgid.link/20260922-fix_l10_max-v1-1-d0c99f063bf4@oss.qualcomm.com
---
arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi b/arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi
index e119ace54e58..ba8c93f01546 100644
--- a/arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi
+++ b/arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi
@@ -172,7 +172,7 @@ pm8150_l9: l9 {
pm8150_l10: l10 {
regulator-min-microvolt = <2700000>;
- regulator-max-microvolt = <3544000>;
+ regulator-max-microvolt = <3300000>;
};
pm8150_l11: l11 {
---
base-commit: 6375e61c01e93e35ee7acd336a689ac1fae4b509
change-id: 20260922-fix_l10_max-c7390de98d73
Best regards,
--
Rakesh Kota <rakesh.kota@oss.qualcomm.com>
next reply other threads:[~2026-09-29 8:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-29 8:35 Rakesh Kota [this message]
2026-09-29 13:10 ` Abel Vesa
2026-09-29 13:54 ` Konrad Dybcio
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