scsi: ufshcd: Allow specifying an Auto-Hibernate Timer value of zero

Setting the Auto-Hibernate Timer to zero is a valid setting which indicates
the Auto-Hibernate feature being disabled. Correctly support this setting.

In addition, when the timer value is queried from sysfs, read from the host
controller's register and return that value instead of using the RAM value.

Link: https://lore.kernel.org/r/b141cfcd7998b8933635828b56fbb64f8ad4d175.1598661071.git.nguyenb@codeaurora.org
Acked-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index 02d379f..bdcd27f 100644 (file)
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -146,12 +146,19 @@ static u32 ufshcd_us_to_ahit(unsigned int timer)
 static ssize_t auto_hibern8_show(struct device *dev,
                                 struct device_attribute *attr, char *buf)
 {
+       u32 ahit;
        struct ufs_hba *hba = dev_get_drvdata(dev);
 
        if (!ufshcd_is_auto_hibern8_supported(hba))
                return -EOPNOTSUPP;
 
-       return snprintf(buf, PAGE_SIZE, "%d\n", ufshcd_ahit_to_us(hba->ahit));
+       pm_runtime_get_sync(hba->dev);
+       ufshcd_hold(hba, false);
+       ahit = ufshcd_readl(hba, REG_AUTO_HIBERNATE_IDLE_TIMER);
+       ufshcd_release(hba);
+       pm_runtime_put_sync(hba->dev);
+
+       return scnprintf(buf, PAGE_SIZE, "%d\n", ufshcd_ahit_to_us(ahit));
 }
 
 static ssize_t auto_hibern8_store(struct device *dev,

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 05716f6..ef210f8 100644 (file)
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -3980,7 +3980,7 @@ void ufshcd_auto_hibern8_enable(struct ufs_hba *hba)
 {
        unsigned long flags;
 
-       if (!ufshcd_is_auto_hibern8_supported(hba) || !hba->ahit)
+       if (!ufshcd_is_auto_hibern8_supported(hba))
                return;
 
        spin_lock_irqsave(hba->host->host_lock, flags);