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Date: Wed, 25 Nov 2020 18:01:00 -0800
From: Can Guo <cang@...eaurora.org>
To: asutoshd@...eaurora.org, nguyenb@...eaurora.org,
hongwus@...eaurora.org, ziqichen@...eaurora.org,
rnayak@...eaurora.org, linux-scsi@...r.kernel.org,
kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com,
cang@...eaurora.org
Cc: Alim Akhtar <alim.akhtar@...sung.com>,
Avri Altman <avri.altman@....com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Bean Huo <beanhuo@...ron.com>,
Stanley Chu <stanley.chu@...iatek.com>,
Tomas Winkler <tomas.winkler@...el.com>,
Bart Van Assche <bvanassche@....org>,
Satya Tangirala <satyat@...gle.com>,
linux-kernel@...r.kernel.org (open list),
linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Mediatek SoC
support),
linux-mediatek@...ts.infradead.org (moderated list:ARM/Mediatek SoC
support)
Subject: [PATCH v3 1/2] scsi: ufs: Refactor ufshcd_setup_clocks() to remove skip_ref_clk
Remove the param skip_ref_clk from __ufshcd_setup_clocks(), but keep a flag
in struct ufs_clk_info to tell whether a clock can be disabled or not while
the link is active.
Reviewed-by: Hongwu Su<hongwus@...eaurora.org>
Reviewed-by: Bean Huo <beanhuo@...ron.com>
Reviewed-by: Stanley Chu <stanley.chu@...iatek.com>
Signed-off-by: Can Guo <cang@...eaurora.org>
---
drivers/scsi/ufs/ufshcd-pltfrm.c | 2 ++
drivers/scsi/ufs/ufshcd.c | 29 +++++++++--------------------
drivers/scsi/ufs/ufshcd.h | 3 +++
3 files changed, 14 insertions(+), 20 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index 3db0af6..873ef14 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -92,6 +92,8 @@ static int ufshcd_parse_clock_info(struct ufs_hba *hba)
clki->min_freq = clkfreq[i];
clki->max_freq = clkfreq[i+1];
clki->name = kstrdup(name, GFP_KERNEL);
+ if (!strcmp(name, "ref_clk"))
+ clki->keep_link_active = true;
dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz",
clki->min_freq, clki->max_freq, clki->name);
list_add_tail(&clki->list, &hba->clk_list_head);
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index a7857f6..44254c9 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -221,8 +221,6 @@ static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd);
static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag);
static void ufshcd_hba_exit(struct ufs_hba *hba);
static int ufshcd_probe_hba(struct ufs_hba *hba, bool async);
-static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
- bool skip_ref_clk);
static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on);
static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba);
static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba);
@@ -1707,11 +1705,7 @@ static void ufshcd_gate_work(struct work_struct *work)
ufshcd_disable_irq(hba);
- if (!ufshcd_is_link_active(hba))
- ufshcd_setup_clocks(hba, false);
- else
- /* If link is active, device ref_clk can't be switched off */
- __ufshcd_setup_clocks(hba, false, true);
+ ufshcd_setup_clocks(hba, false);
/*
* In case you are here to cancel this work the gating state
@@ -7990,8 +7984,7 @@ static int ufshcd_init_hba_vreg(struct ufs_hba *hba)
return 0;
}
-static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
- bool skip_ref_clk)
+static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on)
{
int ret = 0;
struct ufs_clk_info *clki;
@@ -8009,7 +8002,12 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
list_for_each_entry(clki, head, list) {
if (!IS_ERR_OR_NULL(clki->clk)) {
- if (skip_ref_clk && !strcmp(clki->name, "ref_clk"))
+ /*
+ * Don't disable clocks which are needed
+ * to keep the link active.
+ */
+ if (ufshcd_is_link_active(hba) &&
+ clki->keep_link_active)
continue;
clk_state_changed = on ^ clki->enabled;
@@ -8054,11 +8052,6 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
return ret;
}
-static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on)
-{
- return __ufshcd_setup_clocks(hba, on, false);
-}
-
static int ufshcd_init_clocks(struct ufs_hba *hba)
{
int ret = 0;
@@ -8577,11 +8570,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
*/
ufshcd_disable_irq(hba);
- if (!ufshcd_is_link_active(hba))
- ufshcd_setup_clocks(hba, false);
- else
- /* If link is active, device ref_clk can't be switched off */
- __ufshcd_setup_clocks(hba, false, true);
+ ufshcd_setup_clocks(hba, false);
if (ufshcd_is_clkgating_allowed(hba)) {
hba->clk_gating.state = CLKS_OFF;
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 66e5338..6f0f2d4 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -229,6 +229,8 @@ struct ufs_dev_cmd {
* @max_freq: maximum frequency supported by the clock
* @min_freq: min frequency that can be used for clock scaling
* @curr_freq: indicates the current frequency that it is set to
+ * @keep_link_active: indicates that the clk should not be disabled if
+ link is active
* @enabled: variable to check against multiple enable/disable
*/
struct ufs_clk_info {
@@ -238,6 +240,7 @@ struct ufs_clk_info {
u32 max_freq;
u32 min_freq;
u32 curr_freq;
+ bool keep_link_active;
bool enabled;
};
--
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