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UPSTREAM: 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()".

Bug: 188004633
Change-Id: Ibee9d90b58dd3300a19f0e065cf8c52f22748c66
(cherry picked from commit 6081b12ceb)
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>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
This commit is contained in:
Stanley Chu
2020-11-12 13:45:37 +08:00
committed by Greg Kroah-Hartman
parent f72ddd6f7c
commit d711e7960c
1 changed files with 10 additions and 4 deletions
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14
drivers/scsi/ufs/ufshcd.c
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@@ -4410,8 +4410,10 @@ 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);
@@ -4437,13 +4439,17 @@ 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);