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>
Reviewed-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
drivers/ufs/core/ufshcd.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 6300ed6..7bc3fc4 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -22,6 +22,7 @@
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/sched/clock.h>
+#include <linux/iopoll.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_driver.h>
@@ -2322,7 +2323,11 @@ 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;
+ u32 val;
+ int ret = read_poll_timeout(ufshcd_readl, val, val & UIC_COMMAND_READY,
+ 500, UIC_CMD_TIMEOUT * 1000, false, hba,
+ REG_CONTROLLER_STATUS);
+ return ret == 0 ? true : false;
}
/**
--
2.7.4
