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BACKPORT: scsi: ufs: allow custom delay prior to host enabling

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Currently a 1 ms delay is applied before polling CONTROLLER_ENABLE
bit. This delay may not be required or can be changed in different
controllers. Make the delay as a changeable value in struct ufs_hba to
allow it customized by vendors.

Bug: 151050916
Change-Id: I7b7551669bd63c38874c3e6f229dcf61a6b91695
(cherry picked from commit b9dc8aca2899fb494d66b6c5f50c25563d1636a7)
[ Resolved minor conflict in drivers/scsi/ufs/ufshcd.h ]
Link: https://lore.kernel.org/r/20200318104016.28049-6-stanley.chu@mediatek.com
Reviewed-by: Avri Altman <avri.altman@wdc.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: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Stanley Chu 2020-03-18 18:40:14 +08:00 • committed by Greg Kroah-Hartman
commit bc215bc7f4
2 changed files with 3 additions and 1 deletions
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3
drivers/scsi/ufs/ufshcd.c
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@ -4487,7 +4487,7 @@ static int ufshcd_hba_execute_hce(struct ufs_hba *hba)
* instruction might be read back.
* This delay can be changed based on the controller.
*/
usleep_range(1000, 1100);
ufshcd_delay_us(hba->hba_enable_delay_us, 100);
/* wait for the host controller to complete initialization */
retry = 10;
@ -8866,6 +8866,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
hba->mmio_base = mmio_base;
hba->irq = irq;
hba->hba_enable_delay_us = 1000;
err = ufshcd_hba_init(hba);
if (err)

1
drivers/scsi/ufs/ufshcd.h
View file

@ -732,6 +732,7 @@ struct ufs_hba {
u32 eh_flags;
u32 intr_mask;
u16 ee_ctrl_mask;
u16 hba_enable_delay_us;
bool is_powered;
/* Work Queues */