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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.

Link: https://lore.kernel.org/r/1606356063-38380-2-git-send-email-cang@codeaurora.org
Reviewed-by: Hongwu Su <hongwus@codeaurora.org>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Can Guo 2020-11-25 18:01:00 -08:00 committed by Martin K. Petersen
parent 817a7c9967
commit 81309c247a
3 changed files with 14 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/scsi/ufs/ufshcd-pltfrm.c
View File

@ -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);

29
drivers/scsi/ufs/ufshcd.c
View File

@ -226,8 +226,6 @@ 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);
@ -1722,11 +1720,7 @@ 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);
/* Put the host controller in low power mode if possible */
ufshcd_hba_vreg_set_lpm(hba);
@ -8052,8 +8046,7 @@ 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;
@ -8071,7 +8064,12 @@ 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;
@ -8116,11 +8114,6 @@ out:
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;
@ -8648,11 +8641,7 @@ disable_clks:
*/
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;

3
drivers/scsi/ufs/ufshcd.h
View File

@ -234,6 +234,8 @@ 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 {
@ -243,6 +245,7 @@ struct ufs_clk_info {
u32 max_freq;
u32 min_freq;
u32 curr_freq;
bool keep_link_active;
bool enabled;
};