linux-kernel - [PATCH v4 1/1] scsi: ufs: Add hibernation callbacks

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Date:   Thu, 2 Feb 2023 21:16:14 +0530
From:   Anjana Hari <quic_ahari@...cinc.com>
To:     <agross@...nel.org>, <andersson@...nel.org>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>
CC:     <alim.akhtar@...sung.com>, <avri.altman@....com>,
        <bvanassche@....org>, <konrad.dybcio@...aro.org>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_narepall@...cinc.com>, <quic_nitirawa@...cinc.com>,
        <quic_rampraka@...cinc.com>, Anjana Hari <quic_ahari@...cinc.com>
Subject: [PATCH v4 1/1] scsi: ufs: Add hibernation callbacks

Adds freeze, thaw and restore callbacks for hibernate and restore
functionality.

Signed-off-by: Anjana Hari <quic_ahari@...cinc.com>
---
 drivers/ufs/core/ufshcd.c   | 51 +++++++++++++++++++++++++++++++++++++
 drivers/ufs/host/ufs-qcom.c |  8 +++++-
 include/ufs/ufshcd.h        |  7 +++++
 3 files changed, 65 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index ec732e4bbbf4..cabe0b4c0138 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -9825,6 +9825,7 @@ static int ufshcd_resume(struct ufs_hba *hba)
 
 	/* enable the host irq as host controller would be active soon */
 	ufshcd_enable_irq(hba);
+
 	goto out;
 
 disable_vreg:
@@ -9988,6 +9989,56 @@ void ufshcd_remove(struct ufs_hba *hba)
 }
 EXPORT_SYMBOL_GPL(ufshcd_remove);
 
+#ifdef CONFIG_PM_SLEEP
+int ufshcd_system_freeze(struct device *dev)
+{
+
+	return ufshcd_system_suspend(dev);
+
+}
+EXPORT_SYMBOL_GPL(ufshcd_system_freeze);
+
+int ufshcd_system_restore(struct device *dev)
+{
+
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	int ret;
+
+	ret = ufshcd_system_resume(dev);
+	if (ret)
+		return ret;
+
+	/* Configure UTRL and UTMRL base address registers */
+	ufshcd_writel(hba, lower_32_bits(hba->utrdl_dma_addr),
+			REG_UTP_TRANSFER_REQ_LIST_BASE_L);
+	ufshcd_writel(hba, upper_32_bits(hba->utrdl_dma_addr),
+			REG_UTP_TRANSFER_REQ_LIST_BASE_H);
+	ufshcd_writel(hba, lower_32_bits(hba->utmrdl_dma_addr),
+			REG_UTP_TASK_REQ_LIST_BASE_L);
+	ufshcd_writel(hba, upper_32_bits(hba->utmrdl_dma_addr),
+			REG_UTP_TASK_REQ_LIST_BASE_H);
+	/*
+	 * Make sure that UTRL and UTMRL base address registers
+	 * are updated with the latest queue addresses. Only after
+	 * updating these addresses, we can queue the new commands.
+	 */
+	mb();
+
+	/* Resuming from hibernate, assume that link was OFF */
+	ufshcd_set_link_off(hba);
+
+	return 0;
+
+}
+EXPORT_SYMBOL_GPL(ufshcd_system_restore);
+
+int ufshcd_system_thaw(struct device *dev)
+{
+	return ufshcd_system_resume(dev);
+}
+EXPORT_SYMBOL_GPL(ufshcd_system_thaw);
+#endif /* CONFIG_PM_SLEEP  */
+
 /**
  * ufshcd_dealloc_host - deallocate Host Bus Adapter (HBA)
  * @hba: pointer to Host Bus Adapter (HBA)
diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 681da3ea7154..057753ed2915 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1714,10 +1714,16 @@ MODULE_DEVICE_TABLE(acpi, ufs_qcom_acpi_match);
 #endif
 
 static const struct dev_pm_ops ufs_qcom_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(ufshcd_system_suspend, ufshcd_system_resume)
 	SET_RUNTIME_PM_OPS(ufshcd_runtime_suspend, ufshcd_runtime_resume, NULL)
 	.prepare	 = ufshcd_suspend_prepare,
+#ifdef CONFIG_PM_SLEEP
 	.complete	 = ufshcd_resume_complete,
+	.suspend         = ufshcd_system_suspend,
+	.resume          = ufshcd_system_resume,
+	.freeze          = ufshcd_system_freeze,
+	.restore         = ufshcd_system_restore,
+	.thaw            = ufshcd_system_thaw,
+#endif
 };
 
 static struct platform_driver ufs_qcom_pltform = {
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 6d26ff0cc07e..aff5fe64631c 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -1073,6 +1073,9 @@ struct ufs_hba {
 	struct ufs_hw_queue *uhq;
 	struct ufs_hw_queue *dev_cmd_queue;
 	struct ufshcd_mcq_opr_info_t mcq_opr[OPR_MAX];
+
+	/* Distinguish between resume and restore */
+	bool restore;
 };
 
 /**
@@ -1278,8 +1281,12 @@ extern int ufshcd_runtime_resume(struct device *dev);
 #ifdef CONFIG_PM_SLEEP
 extern int ufshcd_system_suspend(struct device *dev);
 extern int ufshcd_system_resume(struct device *dev);
+extern int ufshcd_system_freeze(struct device *dev);
+extern int ufshcd_system_thaw(struct device *dev);
+extern int ufshcd_system_restore(struct device *dev);
 #endif
 extern int ufshcd_shutdown(struct ufs_hba *hba);
+
 extern int ufshcd_dme_configure_adapt(struct ufs_hba *hba,
 				      int agreed_gear,
 				      int adapt_val);
-- 
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