From: Can Guo <cang@codeaurora.org>
To: asutoshd@codeaurora.org, nguyenb@codeaurora.org,
hongwus@codeaurora.org, ziqichen@codeaurora.org,
rnayak@codeaurora.org, linux-scsi@vger.kernel.org,
kernel-team@android.com, saravanak@google.com,
salyzyn@google.com, cang@codeaurora.org
Cc: Alim Akhtar <alim.akhtar@samsung.com>,
Avri Altman <avri.altman@wdc.com>,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Tomas Winkler <tomas.winkler@intel.com>,
Bean Huo <beanhuo@micron.com>,
Stanley Chu <stanley.chu@mediatek.com>,
Bart Van Assche <bvanassche@acm.org>,
Satya Tangirala <satyat@google.com>,
linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v2 1/2] scsi: ufs: Refector ufshcd_setup_clocks() to remove skip_ref_clk
Date: Mon, 23 Nov 2020 23:28:25 -0800 [thread overview]
Message-ID: <1606202906-14485-2-git-send-email-cang@codeaurora.org> (raw)
In-Reply-To: <1606202906-14485-1-git-send-email-cang@codeaurora.org>
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.
Signed-off-by: Can Guo <cang@codeaurora.org>
---
drivers/scsi/ufs/ufshcd-pltfrm.c | 2 ++
drivers/scsi/ufs/ufshcd.c | 25 +++++--------------------
drivers/scsi/ufs/ufshcd.h | 3 +++
3 files changed, 10 insertions(+), 20 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index 3db0af6..39b1f9b 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->always_on_while_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..0802c10 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 +8002,8 @@ 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"))
+ if (ufshcd_is_link_active(hba) &&
+ clki->always_on_while_link_active)
continue;
clk_state_changed = on ^ clki->enabled;
@@ -8054,11 +8048,6 @@ 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 +8566,7 @@ 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..a06bdfb 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
+ * @always_on_while_link_active: indicate that the clk should not be disabled if
+ link is still 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 always_on_while_link_active;
bool enabled;
};
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
next parent reply other threads:[~2020-11-24 7:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1606202906-14485-1-git-send-email-cang@codeaurora.org>
2020-11-24 7:28 ` Can Guo [this message]
2020-11-24 21:09 ` [PATCH v2 1/2] scsi: ufs: Refector ufshcd_setup_clocks() to remove skip_ref_clk Bean Huo
2020-11-25 0:53 ` Can Guo
2020-11-25 2:01 ` hongwus
2020-11-25 11:54 ` Bean Huo
2020-11-25 12:28 ` Can Guo
2020-11-25 19:02 ` Bean Huo
2020-11-26 1:45 ` Can Guo
2020-11-26 0:58 ` Stanley Chu
2020-11-26 1:25 ` Can Guo
2020-11-24 7:28 ` [PATCH v2 2/2] scsi: ufs-qcom: Keep core_clk_unipro ON while link is active Can Guo
2020-11-25 2:02 ` hongwus
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