scsi: ufs: Add sysfs node to dynamically control clock scaling
Provide an option to enable/disable clock scaling during runtime. Write 1/0 to "clkscale_enable" sysfs node to enable/disable clock scaling. Signed-off-by: Sahitya Tummala <stummala@codeaurora.org> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Sahitya Tummala
Martin K. Petersen
Родитель
b427411abb
Коммит
fcb0c4b08a
|
|
@ -230,6 +230,9 @@ static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba);
|
|||
static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba);
|
||||
static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba);
|
||||
static int ufshcd_host_reset_and_restore(struct ufs_hba *hba);
|
||||
static void ufshcd_resume_clkscaling(struct ufs_hba *hba);
|
||||
static void ufshcd_suspend_clkscaling(struct ufs_hba *hba);
|
||||
static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up);
|
||||
static irqreturn_t ufshcd_intr(int irq, void *__hba);
|
||||
static int ufshcd_config_pwr_mode(struct ufs_hba *hba,
|
||||
struct ufs_pa_layer_attr *desired_pwr_mode);
|
||||
|
|
@ -713,16 +716,58 @@ static bool ufshcd_is_unipro_pa_params_tuning_req(struct ufs_hba *hba)
|
|||
|
||||
static void ufshcd_suspend_clkscaling(struct ufs_hba *hba)
|
||||
{
|
||||
if (ufshcd_is_clkscaling_enabled(hba)) {
|
||||
devfreq_suspend_device(hba->devfreq);
|
||||
hba->clk_scaling.window_start_t = 0;
|
||||
}
|
||||
if (!ufshcd_is_clkscaling_supported(hba))
|
||||
return;
|
||||
|
||||
devfreq_suspend_device(hba->devfreq);
|
||||
hba->clk_scaling.window_start_t = 0;
|
||||
}
|
||||
|
||||
static void ufshcd_resume_clkscaling(struct ufs_hba *hba)
|
||||
{
|
||||
if (ufshcd_is_clkscaling_enabled(hba))
|
||||
devfreq_resume_device(hba->devfreq);
|
||||
devfreq_resume_device(hba->devfreq);
|
||||
}
|
||||
|
||||
static ssize_t ufshcd_clkscale_enable_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct ufs_hba *hba = dev_get_drvdata(dev);
|
||||
|
||||
return snprintf(buf, PAGE_SIZE, "%d\n", hba->clk_scaling.is_allowed);
|
||||
}
|
||||
|
||||
static ssize_t ufshcd_clkscale_enable_store(struct device *dev,
|
||||
struct device_attribute *attr, const char *buf, size_t count)
|
||||
{
|
||||
struct ufs_hba *hba = dev_get_drvdata(dev);
|
||||
u32 value;
|
||||
int err;
|
||||
|
||||
if (kstrtou32(buf, 0, &value))
|
||||
return -EINVAL;
|
||||
|
||||
value = !!value;
|
||||
if (value == hba->clk_scaling.is_allowed)
|
||||
goto out;
|
||||
|
||||
pm_runtime_get_sync(hba->dev);
|
||||
ufshcd_hold(hba, false);
|
||||
|
||||
if (value) {
|
||||
ufshcd_resume_clkscaling(hba);
|
||||
} else {
|
||||
ufshcd_suspend_clkscaling(hba);
|
||||
err = ufshcd_scale_clks(hba, true);
|
||||
if (err)
|
||||
dev_err(hba->dev, "%s: failed to scale clocks up %d\n",
|
||||
__func__, err);
|
||||
}
|
||||
hba->clk_scaling.is_allowed = value;
|
||||
|
||||
ufshcd_release(hba);
|
||||
pm_runtime_put_sync(hba->dev);
|
||||
out:
|
||||
return count;
|
||||
}
|
||||
|
||||
static void ufshcd_ungate_work(struct work_struct *work)
|
||||
|
|
@ -758,7 +803,8 @@ static void ufshcd_ungate_work(struct work_struct *work)
|
|||
hba->clk_gating.is_suspended = false;
|
||||
}
|
||||
unblock_reqs:
|
||||
ufshcd_resume_clkscaling(hba);
|
||||
if (hba->clk_scaling.is_allowed)
|
||||
ufshcd_resume_clkscaling(hba);
|
||||
scsi_unblock_requests(hba->host);
|
||||
}
|
||||
|
||||
|
|
@ -1046,7 +1092,7 @@ static void ufshcd_exit_clk_gating(struct ufs_hba *hba)
|
|||
/* Must be called with host lock acquired */
|
||||
static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba)
|
||||
{
|
||||
if (!ufshcd_is_clkscaling_enabled(hba))
|
||||
if (!ufshcd_is_clkscaling_supported(hba))
|
||||
return;
|
||||
|
||||
if (!hba->clk_scaling.is_busy_started) {
|
||||
|
|
@ -1059,7 +1105,7 @@ static void ufshcd_clk_scaling_update_busy(struct ufs_hba *hba)
|
|||
{
|
||||
struct ufs_clk_scaling *scaling = &hba->clk_scaling;
|
||||
|
||||
if (!ufshcd_is_clkscaling_enabled(hba))
|
||||
if (!ufshcd_is_clkscaling_supported(hba))
|
||||
return;
|
||||
|
||||
if (!hba->outstanding_reqs && scaling->is_busy_started) {
|
||||
|
|
@ -5526,12 +5572,15 @@ static int ufshcd_probe_hba(struct ufs_hba *hba)
|
|||
pm_runtime_put_sync(hba->dev);
|
||||
}
|
||||
|
||||
/* Resume devfreq after UFS device is detected */
|
||||
if (ufshcd_is_clkscaling_supported(hba)) {
|
||||
ufshcd_resume_clkscaling(hba);
|
||||
hba->clk_scaling.is_allowed = true;
|
||||
}
|
||||
|
||||
if (!hba->is_init_prefetch)
|
||||
hba->is_init_prefetch = true;
|
||||
|
||||
/* Resume devfreq after UFS device is detected */
|
||||
ufshcd_resume_clkscaling(hba);
|
||||
|
||||
out:
|
||||
/*
|
||||
* If we failed to initialize the device or the device is not
|
||||
|
|
@ -6484,7 +6533,8 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
|
|||
ufshcd_urgent_bkops(hba);
|
||||
hba->clk_gating.is_suspended = false;
|
||||
|
||||
ufshcd_resume_clkscaling(hba);
|
||||
if (hba->clk_scaling.is_allowed)
|
||||
ufshcd_resume_clkscaling(hba);
|
||||
|
||||
/* Schedule clock gating in case of no access to UFS device yet */
|
||||
ufshcd_release(hba);
|
||||
|
|
@ -6702,6 +6752,8 @@ void ufshcd_remove(struct ufs_hba *hba)
|
|||
ufshcd_hba_stop(hba, true);
|
||||
|
||||
ufshcd_exit_clk_gating(hba);
|
||||
if (ufshcd_is_clkscaling_supported(hba))
|
||||
device_remove_file(hba->dev, &hba->clk_scaling.enable_attr);
|
||||
ufshcd_hba_exit(hba);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ufshcd_remove);
|
||||
|
|
@ -6835,7 +6887,7 @@ static int ufshcd_devfreq_target(struct device *dev,
|
|||
bool release_clk_hold = false;
|
||||
unsigned long irq_flags;
|
||||
|
||||
if (!ufshcd_is_clkscaling_enabled(hba))
|
||||
if (!ufshcd_is_clkscaling_supported(hba))
|
||||
return -EINVAL;
|
||||
|
||||
spin_lock_irqsave(hba->host->host_lock, irq_flags);
|
||||
|
|
@ -6883,7 +6935,7 @@ static int ufshcd_devfreq_get_dev_status(struct device *dev,
|
|||
struct ufs_clk_scaling *scaling = &hba->clk_scaling;
|
||||
unsigned long flags;
|
||||
|
||||
if (!ufshcd_is_clkscaling_enabled(hba))
|
||||
if (!ufshcd_is_clkscaling_supported(hba))
|
||||
return -EINVAL;
|
||||
|
||||
memset(stat, 0, sizeof(*stat));
|
||||
|
|
@ -6919,6 +6971,16 @@ static struct devfreq_dev_profile ufs_devfreq_profile = {
|
|||
.target = ufshcd_devfreq_target,
|
||||
.get_dev_status = ufshcd_devfreq_get_dev_status,
|
||||
};
|
||||
static void ufshcd_clkscaling_init_sysfs(struct ufs_hba *hba)
|
||||
{
|
||||
hba->clk_scaling.enable_attr.show = ufshcd_clkscale_enable_show;
|
||||
hba->clk_scaling.enable_attr.store = ufshcd_clkscale_enable_store;
|
||||
sysfs_attr_init(&hba->clk_scaling.enable_attr.attr);
|
||||
hba->clk_scaling.enable_attr.attr.name = "clkscale_enable";
|
||||
hba->clk_scaling.enable_attr.attr.mode = 0644;
|
||||
if (device_create_file(hba->dev, &hba->clk_scaling.enable_attr))
|
||||
dev_err(hba->dev, "Failed to create sysfs for clkscale_enable\n");
|
||||
}
|
||||
|
||||
/**
|
||||
* ufshcd_init - Driver initialization routine
|
||||
|
|
@ -7045,7 +7107,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
|
|||
goto out_remove_scsi_host;
|
||||
}
|
||||
|
||||
if (ufshcd_is_clkscaling_enabled(hba)) {
|
||||
if (ufshcd_is_clkscaling_supported(hba)) {
|
||||
hba->devfreq = devm_devfreq_add_device(dev, &ufs_devfreq_profile,
|
||||
"simple_ondemand", NULL);
|
||||
if (IS_ERR(hba->devfreq)) {
|
||||
|
|
@ -7056,6 +7118,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
|
|||
}
|
||||
/* Suspend devfreq until the UFS device is detected */
|
||||
ufshcd_suspend_clkscaling(hba);
|
||||
ufshcd_clkscaling_init_sysfs(hba);
|
||||
}
|
||||
|
||||
/* Hold auto suspend until async scan completes */
|
||||
|
|
|
|||
|
|
@ -342,6 +342,8 @@ struct ufs_clk_scaling {
|
|||
bool is_busy_started;
|
||||
unsigned long tot_busy_t;
|
||||
unsigned long window_start_t;
|
||||
struct device_attribute enable_attr;
|
||||
bool is_allowed;
|
||||
};
|
||||
|
||||
/**
|
||||
|
|
@ -580,7 +582,7 @@ static inline bool ufshcd_can_hibern8_during_gating(struct ufs_hba *hba)
|
|||
{
|
||||
return hba->caps & UFSHCD_CAP_HIBERN8_WITH_CLK_GATING;
|
||||
}
|
||||
static inline int ufshcd_is_clkscaling_enabled(struct ufs_hba *hba)
|
||||
static inline int ufshcd_is_clkscaling_supported(struct ufs_hba *hba)
|
||||
{
|
||||
return hba->caps & UFSHCD_CAP_CLK_SCALING;
|
||||
}
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче