Hi Kim,
On 2016-10-06 01:17, Kiwoong Kim wrote:
Some UFS host controller may need to require some sequences
before used clocks are turned on or off.
e.g) control internal gates in UFS host
I believe we are doing couple of other things as well other than clock
control in this patch, such as hibern8 notify, *nexus_t* notify. You
might want to separate each in different patches. Also, please find more
additional below.
Signed-off-by: Kiwoong Kim <kwmad.kim@xxxxxxxxxxx>
---
drivers/scsi/ufs/ufshcd.c | 15 +++++++++++++--
drivers/scsi/ufs/ufshcd.h | 37 +++++++++++++++++++++++++++++++++++++
2 files changed, 50 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 05c7456..82c9a40 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1474,6 +1474,7 @@ static int ufshcd_queuecommand(struct Scsi_Host
*host, struct scsi_cmnd *cmd)
/* issue command to the controller */
spin_lock_irqsave(hba->host->host_lock, flags);
+ ufshcd_vops_set_nexus_t_xfer_req(hba, tag, lrbp->cmd);
ufshcd_send_command(hba, tag);
out_unlock:
spin_unlock_irqrestore(hba->host->host_lock, flags);
@@ -1683,6 +1684,7 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba
*hba,
/* Make sure descriptors are ready before ringing the doorbell */
wmb();
spin_lock_irqsave(hba->host->host_lock, flags);
+ ufshcd_vops_set_nexus_t_xfer_req(hba, tag, lrbp->cmd);
what does "next_t_xfer_req" means? why do we need this? and do you think
it may be useful/needed for non-exynos UFS host controllers as well?
ufshcd_send_command(hba, tag);
spin_unlock_irqrestore(hba->host->host_lock, flags);
@@ -2651,6 +2653,8 @@ static int __ufshcd_uic_hibern8_enter(struct
ufs_hba *hba)
int ret;
struct uic_command uic_cmd = {0};
+ ufshcd_vops_hibern8_notify(hba, true, PRE_CHANGE);
+
uic_cmd.command = UIC_CMD_DME_HIBER_ENTER;
ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
@@ -2664,7 +2668,8 @@ static int __ufshcd_uic_hibern8_enter(struct
ufs_hba *hba)
*/
if (ufshcd_link_recovery(hba))
ret = -ENOLINK;
- }
+ } else
+ ufshcd_vops_hibern8_notify(hba, true, POST_CHANGE);
return ret;
}
@@ -2687,13 +2692,16 @@ static int ufshcd_uic_hibern8_exit(struct
ufs_hba *hba)
struct uic_command uic_cmd = {0};
int ret;
+ ufshcd_vops_hibern8_notify(hba, false, PRE_CHANGE);
+
uic_cmd.command = UIC_CMD_DME_HIBER_EXIT;
ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
if (ret) {
dev_err(hba->dev, "%s: hibern8 exit failed. ret = %d\n",
__func__, ret);
ret = ufshcd_link_recovery(hba);
- }
+ } else
+ ufshcd_vops_hibern8_notify(hba, false, POST_CHANGE);
return ret;
}
@@ -4312,6 +4320,7 @@ static int ufshcd_issue_tm_cmd(struct ufs_hba
*hba, int lun_id, int task_id,
task_req_upiup->input_param2 = cpu_to_be32(task_id);
/* send command to the controller */
+ ufshcd_vops_set_nexus_t_task_mgmt(hba, free_slot, tm_function);
Same question as "next_t_xfer_req". what does "next_t_task_mgmt" means?
why do we need this? and do you think it may be useful/needed for
non-exynos UFS host controllers as well?
__set_bit(free_slot, &hba->outstanding_tasks);
/* Make sure descriptors are ready before ringing the task doorbell
*/
@@ -5389,6 +5398,8 @@ static int __ufshcd_setup_clocks(struct ufs_hba
*hba, bool on,
if (!head || list_empty(head))
goto out;
+ ufshcd_vops_pre_setup_clocks(hba, on);
+
I don't think we need a different op for this, we can simply use the
existing op and add one more argument to it to indicate
PRE_CHANGE/POST_CHANGE. If you agree with my response to "[PATCH v2]
scsi: ufshcd: fix possible unclocked register access" patch, i can
update send out v3 of my patch and then you can rebase your patch series
on top of my patch.
list_for_each_entry(clki, head, list) {
if (!IS_ERR_OR_NULL(clki->clk)) {
if (skip_ref_clk && !strcmp(clki->name, "ref_clk"))
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 430bef1..b97f7c2 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -252,6 +252,7 @@ struct ufs_pwr_mode_info {
* @exit: called to cleanup everything done in init
* @get_ufs_hci_version: called to get UFS HCI version
* @clk_scale_notify: notifies that clks are scaled up/down
+ * @pre_setup_clocks: called before controlling used clocks
* @setup_clocks: called before touching any of the controller
registers
* @setup_regulators: called before accessing the host controller
* @hce_enable_notify: called before and after HCE enable bit is set
to allow
@@ -261,6 +262,9 @@ struct ufs_pwr_mode_info {
* @pwr_change_notify: called before and after a power mode change
* is carried out to allow vendor spesific capabilities
* to be set.
+ * @set_nexus_t_xfer_req:
+ * @set_nexus_t_task_mgmt:
+ * @hibern8_notify:
* @suspend: called during host controller PM callback
* @resume: called during host controller PM callback
* @dbg_register_dump: used to dump controller debug information
@@ -273,6 +277,7 @@ struct ufs_hba_variant_ops {
u32 (*get_ufs_hci_version)(struct ufs_hba *);
int (*clk_scale_notify)(struct ufs_hba *, bool,
enum ufs_notify_change_status);
+ int (*pre_setup_clocks)(struct ufs_hba *, bool);
int (*setup_clocks)(struct ufs_hba *, bool);
int (*setup_regulators)(struct ufs_hba *, bool);
int (*hce_enable_notify)(struct ufs_hba *,
@@ -283,6 +288,10 @@ struct ufs_hba_variant_ops {
enum ufs_notify_change_status status,
struct ufs_pa_layer_attr *,
struct ufs_pa_layer_attr *);
+ void (*set_nexus_t_xfer_req)(struct ufs_hba *,
+ int, struct scsi_cmnd *);
+ void (*set_nexus_t_task_mgmt)(struct ufs_hba *, int, u8);
+ void (*hibern8_notify)(struct ufs_hba *, u8, bool);
int (*suspend)(struct ufs_hba *, enum ufs_pm_op);
int (*resume)(struct ufs_hba *, enum ufs_pm_op);
void (*dbg_register_dump)(struct ufs_hba *hba);
@@ -755,6 +764,13 @@ static inline int
ufshcd_vops_clk_scale_notify(struct ufs_hba *hba,
return 0;
}
+static inline int ufshcd_vops_pre_setup_clocks(struct ufs_hba *hba,
bool on)
+{
+ if (hba->vops && hba->vops->pre_setup_clocks)
+ return hba->vops->pre_setup_clocks(hba, on);
+ return 0;
+}
+
static inline int ufshcd_vops_setup_clocks(struct ufs_hba *hba, bool
on)
{
if (hba->vops && hba->vops->setup_clocks)
@@ -799,6 +815,27 @@ static inline int
ufshcd_vops_pwr_change_notify(struct ufs_hba *hba,
return -ENOTSUPP;
}
+static inline void ufshcd_vops_set_nexus_t_xfer_req(struct ufs_hba
*hba,
+ int tag, struct scsi_cmnd *cmd)
+{
+ if (hba->vops && hba->vops->set_nexus_t_xfer_req)
+ return hba->vops->set_nexus_t_xfer_req(hba, tag, cmd);
+}
+
+static inline void ufshcd_vops_set_nexus_t_task_mgmt(struct ufs_hba
*hba,
+ int tag, u8 tm_function)
+{
+ if (hba->vops && hba->vops->set_nexus_t_task_mgmt)
+ return hba->vops->set_nexus_t_task_mgmt(hba, tag, tm_function);
+}
+
+static inline void ufshcd_vops_hibern8_notify(struct ufs_hba *hba,
+ u8 enter, bool notify)
+{
+ if (hba->vops && hba->vops->hibern8_notify)
+ return hba->vops->hibern8_notify(hba, enter, notify);
+}
+
static inline int ufshcd_vops_suspend(struct ufs_hba *hba, enum
ufs_pm_op op)
{
if (hba->vops && hba->vops->suspend)
--
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