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scsi: ufs: add quirk to enable host controller without hce

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Some host controllers don't support host controller enable via HCE.

Signed-off-by: Seungwon Jeon <essuuj@gmail.com>
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Alim Akhtar 2018-05-06 15:44:17 +05:30 committed by Martin K. Petersen
parent 5ac6abc941
commit 4404c5de77
2 changed files with 78 additions and 2 deletions
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75
drivers/scsi/ufs/ufshcd.c
View File

@ -3364,6 +3364,52 @@ static int ufshcd_dme_link_startup(struct ufs_hba *hba)
"dme-link-startup: error code %d\n", ret);
return ret;
}
/**
* ufshcd_dme_reset - UIC command for DME_RESET
* @hba: per adapter instance
*
* DME_RESET command is issued in order to reset UniPro stack.
* This function now deal with cold reset.
*
* Returns 0 on success, non-zero value on failure
*/
static int ufshcd_dme_reset(struct ufs_hba *hba)
{
struct uic_command uic_cmd = {0};
int ret;
uic_cmd.command = UIC_CMD_DME_RESET;
ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
if (ret)
dev_err(hba->dev,
"dme-reset: error code %d\n", ret);
return ret;
}
/**
* ufshcd_dme_enable - UIC command for DME_ENABLE
* @hba: per adapter instance
*
* DME_ENABLE command is issued in order to enable UniPro stack.
*
* Returns 0 on success, non-zero value on failure
*/
static int ufshcd_dme_enable(struct ufs_hba *hba)
{
struct uic_command uic_cmd = {0};
int ret;
uic_cmd.command = UIC_CMD_DME_ENABLE;
ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
if (ret)
dev_err(hba->dev,
"dme-reset: error code %d\n", ret);
return ret;
}
static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba)
{
@ -4022,7 +4068,7 @@ static inline void ufshcd_hba_stop(struct ufs_hba *hba, bool can_sleep)
}
/**
* ufshcd_hba_enable - initialize the controller
* ufshcd_hba_execute_hce - initialize the controller
* @hba: per adapter instance
*
* The controller resets itself and controller firmware initialization
@ -4031,7 +4077,7 @@ static inline void ufshcd_hba_stop(struct ufs_hba *hba, bool can_sleep)
*
* Returns 0 on success, non-zero value on failure
*/
static int ufshcd_hba_enable(struct ufs_hba *hba)
static int ufshcd_hba_execute_hce(struct ufs_hba *hba)
{
int retry;
@ -4086,6 +4132,31 @@ static int ufshcd_hba_enable(struct ufs_hba *hba)
return 0;
}
static int ufshcd_hba_enable(struct ufs_hba *hba)
{
int ret;
if (hba->quirks & UFSHCI_QUIRK_BROKEN_HCE) {
ufshcd_set_link_off(hba);
ufshcd_vops_hce_enable_notify(hba, PRE_CHANGE);
/* enable UIC related interrupts */
ufshcd_enable_intr(hba, UFSHCD_UIC_MASK);
ret = ufshcd_dme_reset(hba);
if (!ret) {
ret = ufshcd_dme_enable(hba);
if (!ret)
ufshcd_vops_hce_enable_notify(hba, POST_CHANGE);
if (ret)
dev_err(hba->dev,
"Host controller enable failed with non-hce\n");
}
} else {
ret = ufshcd_hba_execute_hce(hba);
}
return ret;
}
static int ufshcd_disable_tx_lcc(struct ufs_hba *hba, bool peer)
{
int tx_lanes, i, err = 0;

5
drivers/scsi/ufs/ufshcd.h
View File

@ -606,6 +606,11 @@ struct ufs_hba {
*/
#define UFSHCI_QUIRK_SKIP_RESET_INTR_AGGR 0x200
/*
* This quirks needs to be enabled if host controller cannot be
* enabled via HCE register.
*/
#define UFSHCI_QUIRK_BROKEN_HCE 0x400
unsigned int quirks; /* Deviations from standard UFSHCI spec. */
/* Device deviations from standard UFS device spec. */