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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>
This commit is contained in:
Bao D. Nguyen 2020-08-28 18:05:13 -07:00 committed by Martin K. Petersen
parent 8c65723566
commit 499f7a9660
2 changed files with 9 additions and 2 deletions
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9
drivers/scsi/ufs/ufs-sysfs.c
View File

@ -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,

2
drivers/scsi/ufs/ufshcd.c
View File

@ -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);