Re: [RFC PATCH v1] ufs: poll HCS.UCRDY before issuing a UIC command
From: Bao D. Nguyen
Date: Wed May 10 2023 - 17:25:19 EST
On 5/9/2023 1:24 AM, Kiwoong Kim wrote:
With auto hibern8 enabled, UIC could be working
for a while to process a hibern8 operation and HCI
reports UIC not ready for a short term through HCS.UCRDY.
And UFS driver can't recognize the operation.
UFSHCI spec specifies UCRDY like this:
whether the host controller is ready to process UIC COMMAND
The 'ready' could be seen as many different meanings. If the meaning
includes not processing any request from HCI, processing a hibern8
operation can be 'not ready'. In this situation, the driver needs to
wait until the operations is completed.
Signed-off-by: Kiwoong Kim <kwmad.kim@xxxxxxxxxxx>
---
drivers/ufs/core/ufshcd.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 96ce6af..fc79539 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -2368,7 +2368,18 @@ static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
*/
static inline bool ufshcd_ready_for_uic_cmd(struct ufs_hba *hba)
{
- return ufshcd_readl(hba, REG_CONTROLLER_STATUS) & UIC_COMMAND_READY;
+ ktime_t timeout = ktime_add_ms(ktime_get(), UIC_CMD_TIMEOUT);
+ u32 val = 0;
+
+ do {
+ val = ufshcd_readl(hba, REG_CONTROLLER_STATUS) &
+ UIC_COMMAND_READY;
+ if (val)
+ break;
+ usleep_range(500, 1000);
Hi Kiwoong,
It looks like you are sleeping while holding the
spin_lock_irqsave(hba->host->host_lock, flags)
in ufshcd_send_uic_cmd()?
+ } while (ktime_before(ktime_get(), timeout));
+
+ return val ? true : false;
}
/**