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scsi: ufs: Add retry flow for failed HBA enabling

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

Link: https://lore.kernel.org/r/20201112054537.22494-1-stanley.chu@mediatek.com
Reviewed-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Stanley Chu 2020-11-12 13:45:37 +08:00 committed by Martin K. Petersen
parent 5443bdc4cc
commit 6081b12ceb
1 changed files with 10 additions and 4 deletions
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14
drivers/scsi/ufs/ufshcd.c
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@ -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);