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[85.76.147.63]) by smtp.gmail.com with ESMTPSA id g3-20020a056512118300b005079dac9620sm1845143lfr.43.2023.10.23.14.53.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Oct 2023 14:53:30 -0700 (PDT) From: Dmitry Baryshkov To: Heikki Krogerus , Greg Kroah-Hartman , Andy Gross , Bjorn Andersson , Konrad Dybcio , Neil Armstrong Cc: Rob Herring , linux-usb@vger.kernel.org, linux-arm-msm@vger.kernel.org Subject: [PATCH 1/2] usb: typec: ucsi: fix UCSI on buggy Qualcomm devices Date: Tue, 24 Oct 2023 00:47:26 +0300 Message-ID: <20231023215327.695720-2-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231023215327.695720-1-dmitry.baryshkov@linaro.org> References: <20231023215327.695720-1-dmitry.baryshkov@linaro.org> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On sevral Qualcomm platforms (SC8180X, SM8350, SC8280XP) a call to UCSI_GET_PDOS for non-PD partners will cause a firmware crash with no easy way to recover from it. Since we have no easy way to determine whether the partner really has PD support, shortcut UCSI_GET_PDOS on such platforms. This allows us to enable UCSI support on such devices. Signed-off-by: Dmitry Baryshkov --- drivers/usb/typec/ucsi/ucsi.c | 3 +++ drivers/usb/typec/ucsi/ucsi.h | 3 +++ drivers/usb/typec/ucsi/ucsi_glink.c | 3 +++ 3 files changed, 9 insertions(+) diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c index 61b64558f96c..5392ec698959 100644 --- a/drivers/usb/typec/ucsi/ucsi.c +++ b/drivers/usb/typec/ucsi/ucsi.c @@ -578,6 +578,9 @@ static int ucsi_read_pdos(struct ucsi_connector *con, u64 command; int ret; + if (ucsi->quirks & UCSI_NO_PARTNER_PDOS) + return 0; + command = UCSI_COMMAND(UCSI_GET_PDOS) | UCSI_CONNECTOR_NUMBER(con->num); command |= UCSI_GET_PDOS_PARTNER_PDO(is_partner); command |= UCSI_GET_PDOS_PDO_OFFSET(offset); diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h index 474315a72c77..6478016d5cb8 100644 --- a/drivers/usb/typec/ucsi/ucsi.h +++ b/drivers/usb/typec/ucsi/ucsi.h @@ -317,6 +317,9 @@ struct ucsi { #define EVENT_PENDING 0 #define COMMAND_PENDING 1 #define ACK_PENDING 2 + + unsigned long quirks; +#define UCSI_NO_PARTNER_PDOS BIT(0) /* Don't read partner's PDOs */ }; #define UCSI_MAX_SVID 5 diff --git a/drivers/usb/typec/ucsi/ucsi_glink.c b/drivers/usb/typec/ucsi/ucsi_glink.c index db6e248f8208..5c159e7b2b65 100644 --- a/drivers/usb/typec/ucsi/ucsi_glink.c +++ b/drivers/usb/typec/ucsi/ucsi_glink.c @@ -327,6 +327,8 @@ static int pmic_glink_ucsi_probe(struct auxiliary_device *adev, if (ret) return ret; + ucsi->ucsi->quirks = id->driver_data; + ucsi_set_drvdata(ucsi->ucsi, ucsi); device_for_each_child_node(dev, fwnode) { @@ -379,6 +381,7 @@ static void pmic_glink_ucsi_remove(struct auxiliary_device *adev) static const struct auxiliary_device_id pmic_glink_ucsi_id_table[] = { { .name = "pmic_glink.ucsi", }, + { .name = "pmic_glink.ucsi-no-pdos", .driver_data = UCSI_NO_PARTNER_PDOS, }, {}, }; MODULE_DEVICE_TABLE(auxiliary, pmic_glink_ucsi_id_table);