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scsi: ufs: Introduce vops for resetting device 

Some UFS memory devices needs their reset line toggled in order to get them
into a good state for initialization. Provide a new vops to allow the
platform driver to implement this operation.

Link: https://lore.kernel.org/r/20190828191756.24312-2-bjorn.andersson@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Acked-by: Avri Altman <Avri.Altman@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bjorn Andersson 2019-08-28 12:17:54 -07:00 committed by Martin K. Petersen
parent 4fb86a6bc5
commit d8d9f7931a
2 changed files with 14 additions and 0 deletions
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6
drivers/scsi/ufs/ufshcd.c
View File

@ -6234,6 +6234,9 @@ static int ufshcd_reset_and_restore(struct ufs_hba *hba)
int retries = MAX_HOST_RESET_RETRIES;
do {
/* Reset the attached device */
ufshcd_vops_device_reset(hba);
err = ufshcd_host_reset_and_restore(hba);
} while (err && --retries);
@ -8367,6 +8370,9 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
goto exit_gating;
}
/* Reset the attached device */
ufshcd_vops_device_reset(hba);
/* Host controller enable */
err = ufshcd_hba_enable(hba);
if (err) {

8
drivers/scsi/ufs/ufshcd.h
View File

@ -298,6 +298,7 @@ struct ufs_pwr_mode_info {
* @resume: called during host controller PM callback
* @dbg_register_dump: used to dump controller debug information
* @phy_initialization: used to initialize phys
* @device_reset: called to issue a reset pulse on the UFS device
*/
struct ufs_hba_variant_ops {
const char *name;
@ -326,6 +327,7 @@ struct ufs_hba_variant_ops {
int (*resume)(struct ufs_hba *, enum ufs_pm_op);
void (*dbg_register_dump)(struct ufs_hba *hba);
int (*phy_initialization)(struct ufs_hba *);
void (*device_reset)(struct ufs_hba *hba);
};
/* clock gating state */
@ -1070,6 +1072,12 @@ static inline void ufshcd_vops_dbg_register_dump(struct ufs_hba *hba)
hba->vops->dbg_register_dump(hba);
}
static inline void ufshcd_vops_device_reset(struct ufs_hba *hba)
{
if (hba->vops && hba->vops->device_reset)
hba->vops->device_reset(hba);
}
extern struct ufs_pm_lvl_states ufs_pm_lvl_states[];
/*