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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-315f53a65adsm154949a91.11.2025.06.24.15.55.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Jun 2025 15:55:38 -0700 (PDT) From: Anjelique Melendez To: andersson@kernel.org, konradybcio@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: dmitry.baryshkov@oss.qualcomm.com, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] soc: qcom: pmic_glink: Add support for subsystem restart (SSR) Date: Tue, 24 Jun 2025 15:55:35 -0700 Message-Id: <20250624225535.2013141-3-anjelique.melendez@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250624225535.2013141-1-anjelique.melendez@oss.qualcomm.com> References: <20250624225535.2013141-1-anjelique.melendez@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-GUID: ZIBns124ob8buzvoP0t9CojxzAqDVJwT X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjI0MDE4MiBTYWx0ZWRfXz0DrK8NFZU1B UQ9N9AS3KHZ4CL9+6l8TXaw0g55pU+9jdRVylG19n+ODwJyxyq7SGzWINLn2Xs5uNqaOyhGLvmV PPwtg75WY+DI0+SznxrTSLudHYy8oPVksE8aoFRTHrv36fLR+ssDyqoye7ltXoiuSZefLUsp4O6 tgkPM/YxSqUr6KWzreJOy/aAd80LMJYSJDxe7F+DeEMPfuCzkA7BrtJBUkVyqvSP8zaqOmpwzXb 28BQn+meM0qGO1R0PLrj1HvJgHhY78e0GhxwJqFMwNh/38T1ZUixPvE1k7ZRExHvwQTWaOWotDJ rXsU0bQQ996kWfpwxu1TklAda3EpHIENRUBoxioMyWM+2wlmSQOe07h/DUCUSqQ7TswHpH8HyQ2 xAzgtp/JkoM0TLj3NKPhW0s1eLIJYtBV+V26k21I43t6yS5Nx16HIKbZqAJPpsGnATloKw6G X-Authority-Analysis: v=2.4 cv=caHSrmDM c=1 sm=1 tr=0 ts=685b2ced cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=6IFa9wvqVegA:10 a=EUspDBNiAAAA:8 a=tIxvoA3mxl7b6XSbyz0A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=3WC7DwWrALyhR5TkjVHa:22 X-Proofpoint-ORIG-GUID: ZIBns124ob8buzvoP0t9CojxzAqDVJwT X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-06-24_06,2025-06-23_07,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 mlxlogscore=999 suspectscore=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 adultscore=0 mlxscore=0 spamscore=0 malwarescore=0 phishscore=0 clxscore=1015 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2506240182 Add support for PMIC Glink clients to receive notificiation when the subsystem goes down and comes up again. Signed-off-by: Anjelique Melendez --- drivers/soc/qcom/pmic_glink.c | 43 +++++++++++++++++++++++++++++++++-- 1 file changed, 41 insertions(+), 2 deletions(-) diff --git a/drivers/soc/qcom/pmic_glink.c b/drivers/soc/qcom/pmic_glink.c index 0a6d325b195c..5121f19d63e5 100644 --- a/drivers/soc/qcom/pmic_glink.c +++ b/drivers/soc/qcom/pmic_glink.c @@ -2,6 +2,7 @@ /* * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved. * Copyright (c) 2022, Linaro Ltd + * ​​​​Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. */ #include #include @@ -9,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -39,10 +41,14 @@ struct pmic_glink { struct mutex state_lock; unsigned int client_state; unsigned int pdr_state; + unsigned int ssr_state; /* serializing clients list updates */ spinlock_t client_lock; struct list_head clients; + + struct notifier_block ssr_nb; + void *ssr_handle; }; static struct pmic_glink *__pmic_glink; @@ -205,10 +211,12 @@ static void pmic_glink_state_notify_clients(struct pmic_glink *pg) unsigned long flags; if (pg->client_state != SERVREG_SERVICE_STATE_UP) { - if (pg->pdr_state == SERVREG_SERVICE_STATE_UP && pg->ept) + if ((pg->pdr_state == SERVREG_SERVICE_STATE_UP || + pg->ssr_state == QCOM_SSR_AFTER_POWERUP) && pg->ept) new_state = SERVREG_SERVICE_STATE_UP; } else { - if (pg->pdr_state == SERVREG_SERVICE_STATE_DOWN || !pg->ept) + if (pg->pdr_state == SERVREG_SERVICE_STATE_DOWN || + pg->ssr_state == QCOM_SSR_BEFORE_SHUTDOWN || !pg->ept) new_state = SERVREG_SERVICE_STATE_DOWN; } @@ -231,6 +239,18 @@ static void pmic_glink_pdr_callback(int state, char *svc_path, void *priv) pmic_glink_state_notify_clients(pg); } +static int pmic_glink_ssr_callback(struct notifier_block *nb, unsigned long code, void *data) +{ + struct pmic_glink *pg = container_of(nb, struct pmic_glink, ssr_nb); + + mutex_lock(&pg->state_lock); + pg->ssr_state = code; + + pmic_glink_state_notify_clients(pg); + mutex_unlock(&pg->state_lock); + return 0; +} + static int pmic_glink_rpmsg_probe(struct rpmsg_device *rpdev) { struct pmic_glink *pg; @@ -281,6 +301,7 @@ static struct rpmsg_driver pmic_glink_rpmsg_driver = { static int pmic_glink_probe(struct platform_device *pdev) { const unsigned long *match_data; + const char *subsys_name = NULL; struct pdr_service *service; struct pmic_glink *pg; int ret; @@ -333,6 +354,22 @@ static int pmic_glink_probe(struct platform_device *pdev) goto out_release_aux_devices; } + if (device_property_present(&pdev->dev, "qcom,subsys-name")) { + device_property_read_string(&pdev->dev, "qcom,subsys-name", &subsys_name); + if (!subsys_name) { + ret = dev_err_probe(&pdev->dev, PTR_ERR(pg->ssr_handle), + "failed to read subsys_name string from dt\n"); + goto out_release_aux_devices; + } + pg->ssr_nb.notifier_call = pmic_glink_ssr_callback; + pg->ssr_handle = qcom_register_ssr_notifier(subsys_name, &pg->ssr_nb); + if (IS_ERR(pg->ssr_handle)) { + ret = dev_err_probe(&pdev->dev, PTR_ERR(pg->ssr_handle), + "failed adding ssr notifier\n"); + goto out_release_aux_devices; + } + } + mutex_lock(&__pmic_glink_lock); __pmic_glink = pg; mutex_unlock(&__pmic_glink_lock); @@ -360,6 +397,8 @@ static void pmic_glink_remove(struct platform_device *pdev) pdr_handle_release(pg->pdr); + if (pg->ssr_handle) + qcom_unregister_ssr_notifier(pg->ssr_handle, &pg->ssr_nb); if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_BATT)) pmic_glink_del_aux_device(pg, &pg->ps_aux); if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_ALTMODE))