This patch provides the sysfs attribute to choose the power management
level for UFS runtime and system suspend.
Reviewed-by: Sujit Reddy Thumma <sthumma@xxxxxxxxxxxxxx>
Signed-off-by: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx>
---
drivers/scsi/ufs/ufshcd.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/scsi/ufs/ufshcd.h | 2 +
2 files changed, 124 insertions(+)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 5f26a39..470ea99 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6757,6 +6757,127 @@ int ufshcd_runtime_idle(struct ufs_hba *hba)
}
EXPORT_SYMBOL(ufshcd_runtime_idle);
+static inline ssize_t ufshcd_pm_lvl_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count,
+ bool rpm)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+ unsigned long flags, value;
+
+ if (kstrtoul(buf, 0, &value))
+ return -EINVAL;
+
+ if ((value < UFS_PM_LVL_0) || (value >= UFS_PM_LVL_MAX))
+ return -EINVAL;
+
+ spin_lock_irqsave(hba->host->host_lock, flags);
+ if (rpm)
+ hba->rpm_lvl = value;
+ else
+ hba->spm_lvl = value;
+ spin_unlock_irqrestore(hba->host->host_lock, flags);
+ return count;
+}
+
+static ssize_t ufshcd_rpm_lvl_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+ int curr_len;
+ u8 lvl;
+
+ curr_len = snprintf(buf, PAGE_SIZE,
+ "\nCurrent Runtime PM level [%d] => dev_state [%s] link_state [%s]\n",
+ hba->rpm_lvl,
+ ufschd_ufs_dev_pwr_mode_to_string(
+ ufs_pm_lvl_states[hba->rpm_lvl].dev_state),
+ ufschd_uic_link_state_to_string(
+ ufs_pm_lvl_states[hba->rpm_lvl].link_state));
+
+ curr_len += snprintf((buf + curr_len), (PAGE_SIZE - curr_len),
+ "\nAll available Runtime PM levels info:\n");
+ for (lvl = UFS_PM_LVL_0; lvl < UFS_PM_LVL_MAX; lvl++)
+ curr_len += snprintf((buf + curr_len), (PAGE_SIZE - curr_len),
+ "\tRuntime PM level [%d] => dev_state [%s] link_state [%s]\n",
+ lvl,
+ ufschd_ufs_dev_pwr_mode_to_string(
+ ufs_pm_lvl_states[lvl].dev_state),
+ ufschd_uic_link_state_to_string(
+ ufs_pm_lvl_states[lvl].link_state));
+
+ return curr_len;
+}
+
+static ssize_t ufshcd_rpm_lvl_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ return ufshcd_pm_lvl_store(dev, attr, buf, count, true);
+}
+
+static void ufshcd_add_rpm_lvl_sysfs_nodes(struct ufs_hba *hba)
+{
+ hba->rpm_lvl_attr.show = ufshcd_rpm_lvl_show;
+ hba->rpm_lvl_attr.store = ufshcd_rpm_lvl_store;
+ sysfs_attr_init(&hba->rpm_lvl_attr.attr);
+ hba->rpm_lvl_attr.attr.name = "rpm_lvl";
+ hba->rpm_lvl_attr.attr.mode = 0644;
+ if (device_create_file(hba->dev, &hba->rpm_lvl_attr))
+ dev_err(hba->dev, "Failed to create sysfs for rpm_lvl\n");
+}
+
+static ssize_t ufshcd_spm_lvl_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+ int curr_len;
+ u8 lvl;
+
+ curr_len = snprintf(buf, PAGE_SIZE,
+ "\nCurrent System PM level [%d] => dev_state [%s] link_state [%s]\n",
+ hba->spm_lvl,
+ ufschd_ufs_dev_pwr_mode_to_string(
+ ufs_pm_lvl_states[hba->spm_lvl].dev_state),
+ ufschd_uic_link_state_to_string(
+ ufs_pm_lvl_states[hba->spm_lvl].link_state));
+
+ curr_len += snprintf((buf + curr_len), (PAGE_SIZE - curr_len),
+ "\nAll available System PM levels info:\n");
+ for (lvl = UFS_PM_LVL_0; lvl < UFS_PM_LVL_MAX; lvl++)
+ curr_len += snprintf((buf + curr_len), (PAGE_SIZE - curr_len),
+ "\tSystem PM level [%d] => dev_state [%s] link_state [%s]\n",
+ lvl,
+ ufschd_ufs_dev_pwr_mode_to_string(
+ ufs_pm_lvl_states[lvl].dev_state),
+ ufschd_uic_link_state_to_string(
+ ufs_pm_lvl_states[lvl].link_state));
+
+ return curr_len;
+}
+
+static ssize_t ufshcd_spm_lvl_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ return ufshcd_pm_lvl_store(dev, attr, buf, count, false);
+}
+
+static void ufshcd_add_spm_lvl_sysfs_nodes(struct ufs_hba *hba)
+{
+ hba->spm_lvl_attr.show = ufshcd_spm_lvl_show;
+ hba->spm_lvl_attr.store = ufshcd_spm_lvl_store;
+ sysfs_attr_init(&hba->spm_lvl_attr.attr);
+ hba->spm_lvl_attr.attr.name = "spm_lvl";
+ hba->spm_lvl_attr.attr.mode = 0644;
+ if (device_create_file(hba->dev, &hba->spm_lvl_attr))
+ dev_err(hba->dev, "Failed to create sysfs for spm_lvl\n");
+}
+
+static inline void ufshcd_add_sysfs_nodes(struct ufs_hba *hba)
+{
+ ufshcd_add_rpm_lvl_sysfs_nodes(hba);
+ ufshcd_add_spm_lvl_sysfs_nodes(hba);
+}
+
/**
* ufshcd_shutdown - shutdown routine
* @hba: per adapter instance
@@ -7181,6 +7302,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
ufshcd_set_ufs_dev_active(hba);
async_schedule(ufshcd_async_scan, hba);
+ ufshcd_add_sysfs_nodes(hba);
return 0;
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index bdd2284..787323b 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -435,6 +435,8 @@ struct ufs_hba {
enum ufs_pm_level rpm_lvl;
/* Desired UFS power management level during system PM */
enum ufs_pm_level spm_lvl;
+ struct device_attribute rpm_lvl_attr;
+ struct device_attribute spm_lvl_attr;
int pm_op_in_progress;
struct ufshcd_lrb *lrb;
--
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