From: Bjorn Andersson <bjorn.andersson@linaro.org>
Date: Wed, 28 Aug 2019 12:17:54 -0700
Subject: [PATCH] scsi: ufs: Introduce vops for resetting device
Git-commit: d8d9f7931ac2698fc2b37d2db748c47122ee2a6f
Patch-mainline: v5.4-rc1
References: bsc#1156419,jsc#SLE-8281
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>
Acked-by: Hannes Reinecke <hare@suse.com>
---
drivers/scsi/ufs/ufshcd.c | 6 ++++++
drivers/scsi/ufs/ufshcd.h | 8 ++++++++
2 files changed, 14 insertions(+)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index ff6a440dc1c2..5c2eb4866044 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -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) {
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 9f61550abc7f..c94cfda52829 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -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[];
/*
--
2.16.4