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From: Johan Hovold <johan+linaro@kernel.org>
To: Bjorn Andersson <andersson@kernel.org>
Cc: Konrad Dybcio <konrad.dybcio@linaro.org>,
	Heikki Krogerus <heikki.krogerus@linux.intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	regressions@lists.linux.dev,
	linux-arm-msm@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Johan Hovold <johan+linaro@kernel.org>,
	Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Subject: [PATCH] soc: qcom: pmic_glink: disable UCSI on sc8280xp
Date: Sat,  8 Jun 2024 13:45:29 +0200
Message-ID: <20240608114529.23060-1-johan+linaro@kernel.org>
Precedence: bulk
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Disconnecting an external display triggers a hypervisor reset on the
Lenovo ThinkPad X13s since 6.10-rc1 which enabled UCSI. Disable it again
until the regression has been fixed properly.

Fixes: 3f91a0bf4a0b ("soc: qcom: pmic_glink: reenable UCSI on sc8280xp")
Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
 drivers/soc/qcom/pmic_glink.c | 4 ++++
 1 file changed, 4 insertions(+)


Dmitry reported off-list that his X13s was crashing when he disconnected
an external display and I tracked it down to the enablement of UCSI in
6.10-rc1.

I have not had time to debug this further, but I'm flagging this as a
regression and sending an effective so that we have a fall back in case
this is not fixed in timely manner.

Note that this likely affects other Qualcomm SoCs as well.

Johan


#regzbot introduced: 3f91a0bf4a0b


diff --git a/drivers/soc/qcom/pmic_glink.c b/drivers/soc/qcom/pmic_glink.c
index 40fb09d69014..65279243072c 100644
--- a/drivers/soc/qcom/pmic_glink.c
+++ b/drivers/soc/qcom/pmic_glink.c
@@ -348,11 +348,15 @@ static void pmic_glink_remove(struct platform_device *pdev)
 	mutex_unlock(&__pmic_glink_lock);
 }
 
+static const unsigned long pmic_glink_sc8280xp_client_mask = BIT(PMIC_GLINK_CLIENT_BATT) |
+							     BIT(PMIC_GLINK_CLIENT_ALTMODE);
+
 static const unsigned long pmic_glink_sm8450_client_mask = BIT(PMIC_GLINK_CLIENT_BATT) |
 							   BIT(PMIC_GLINK_CLIENT_ALTMODE) |
 							   BIT(PMIC_GLINK_CLIENT_UCSI);
 
 static const struct of_device_id pmic_glink_of_match[] = {
+	{ .compatible = "qcom,sc8280xp-pmic-glink", .data = &pmic_glink_sc8280xp_client_mask },
 	{ .compatible = "qcom,pmic-glink", .data = &pmic_glink_sm8450_client_mask },
 	{}
 };
-- 
2.44.1