On 2020-08-28 20:13, Bart Van Assche wrote:
On 2020-08-28 18:05, Bao D. Nguyen wrote:
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);
Although not strictly required for SCSI code, how about following the
"reverse
christmas tree" convention and adding "u32 ahit" below the "hba"
declaration?
Thanks for your comment. I will change it.
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));
}
Why the pm_runtime_get_sync()/pm_runtime_put_sync() and
ufshcd_hold()/ufshcd_release() calls? I don't think these are necessary
here.
We may try to access the hardware register during runtime suspend or UFS
clock is gated.
UFS clock gating can happen even during runtime resume. Here we are
trying to prevent NoC error
due to unclocked access.
Thanks,
Bart.
