[PATCH] scsi: ufs: Add retry flow for failed hba enabling

Stanley Chu
2020-11-12T05:45:58Z

Once hba enabling is failed, add retry mechanism and in the
meanwhile allow vendors to apply specific handlings before
the next retry. For example, vendors can do vendor-specific
host reset flow in variant function "ufshcd_vops_hce_enable_notify()".

Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
---
drivers/scsi/ufs/ufshcd.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 8001bbfec5c0..9186ee01379a 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4328,8 +4328,10 @@ static inline void ufshcd_hba_stop(struct ufs_hba *hba)
*/
static int ufshcd_hba_execute_hce(struct ufs_hba *hba)
{
- int retry;
+ int retry_outer = 3;
+ int retry_inner;

+start:
if (!ufshcd_is_hba_active(hba))
/* change controller state to "reset state" */
ufshcd_hba_stop(hba);
@@ -4355,13 +4357,17 @@ static int ufshcd_hba_execute_hce(struct ufs_hba *hba)
ufshcd_delay_us(hba->vps->hba_enable_delay_us, 100);

/* wait for the host controller to complete initialization */
- retry = 50;
+ retry_inner = 50;
while (ufshcd_is_hba_active(hba)) {
- if (retry) {
- retry--;
+ if (retry_inner) {
+ retry_inner--;
} else {
dev_err(hba->dev,
"Controller enable failed\n");
+ if (retry_outer) {
+ retry_outer--;
+ goto start;
+ }
return -EIO;
}
usleep_range(1000, 1100);
--
2.18.0