diff mbox

[3/3] scsi: ufs: Use freq table with devfreq

Message ID 20180424002016.9205-4-bjorn.andersson@linaro.org (mailing list archive)
State Changes Requested
Headers show

Commit Message

Bjorn Andersson April 24, 2018, 12:20 a.m. UTC 
devfreq requires that the client operates on actual frequencies, not
only 0 and UMAX_INT and as such UFS brok with the introduction of
f1d981eaecf8 ("PM / devfreq: Use the available min/max frequency").

This patch registers the frequencies of the first clock with devfreq and
use these to determine if we're trying to step up or down.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 drivers/scsi/ufs/ufshcd.c | 39 ++++++++++++++++++++++++++++++++-------
 1 file changed, 32 insertions(+), 7 deletions(-)

Comments

subhashj@codeaurora.org April 24, 2018, 10:08 p.m. UTC | #1 
On 2018-04-23 17:20, Bjorn Andersson wrote:
> devfreq requires that the client operates on actual frequencies, not
> only 0 and UMAX_INT and as such UFS brok with the introduction of
> f1d981eaecf8 ("PM / devfreq: Use the available min/max frequency").
> 
> This patch registers the frequencies of the first clock with devfreq 
> and
> use these to determine if we're trying to step up or down.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>  drivers/scsi/ufs/ufshcd.c | 39 ++++++++++++++++++++++++++++++++-------
>  1 file changed, 32 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 2253f24309ec..07b1f3c7bd2d 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -1168,16 +1168,13 @@ static int ufshcd_devfreq_target(struct device 
> *dev,
>  	struct ufs_hba *hba = dev_get_drvdata(dev);
>  	ktime_t start;
>  	bool scale_up, sched_clk_scaling_suspend_work = false;
> +	struct list_head *clk_list = &hba->clk_list_head;
> +	struct ufs_clk_info *clki;
>  	unsigned long irq_flags;
> 
>  	if (!ufshcd_is_clkscaling_supported(hba))
>  		return -EINVAL;
> 
> -	if ((*freq > 0) && (*freq < UINT_MAX)) {
> -		dev_err(hba->dev, "%s: invalid freq = %lu\n", __func__, *freq);
> -		return -EINVAL;
> -	}
> -
>  	spin_lock_irqsave(hba->host->host_lock, irq_flags);
>  	if (ufshcd_eh_in_progress(hba)) {
>  		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
> @@ -1187,7 +1184,13 @@ static int ufshcd_devfreq_target(struct device 
> *dev,
>  	if (!hba->clk_scaling.active_reqs)
>  		sched_clk_scaling_suspend_work = true;
> 
> -	scale_up = (*freq == UINT_MAX) ? true : false;
> +	if (list_empty(clk_list)) {
> +		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
> +		goto out;
> +	}
> +
> +	clki = list_first_entry(&hba->clk_list_head, struct ufs_clk_info, 
> list);
> +	scale_up = (*freq == clki->max_freq) ? true : false;
>  	if (!ufshcd_is_devfreq_scaling_required(hba, scale_up)) {
>  		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
>  		ret = 0;
> @@ -1257,11 +1260,33 @@ static struct devfreq_dev_profile
> ufs_devfreq_profile = {
> 
>  static int ufshcd_devfreq_init(struct ufs_hba *hba)
>  {
> +	struct devfreq_dev_profile *profile;
> +	struct list_head *clk_list = &hba->clk_list_head;
> +	struct ufs_clk_info *clki;
>  	struct devfreq *devfreq;
>  	int ret;
> 
> +	/* Skip devfreq if we don't have any clocks in the list */
> +	if (list_empty(clk_list))
> +		return 0;
> +
> +	profile = devm_kmemdup(hba->dev, &ufs_devfreq_profile,
> +			       sizeof(ufs_devfreq_profile), GFP_KERNEL);
> +	if (!profile)
> +		return -ENOMEM;
> +
> +	profile->max_state = 2;
> +	profile->freq_table = devm_kcalloc(hba->dev, profile->max_state,
> +					   sizeof(unsigned long), GFP_KERNEL);
> +	if (!profile->freq_table)
> +		return -ENOMEM;
> +
> +	clki = list_first_entry(&hba->clk_list_head, struct ufs_clk_info, 
> list);
> +	profile->freq_table[0] = clki->min_freq;
> +	profile->freq_table[1] = clki->max_freq;
> +
>  	devfreq = devm_devfreq_add_device(hba->dev,
> -			&ufs_devfreq_profile,
> +			profile,
>  			"simple_ondemand",
>  			NULL);
>  	if (IS_ERR(devfreq)) {

Looks good to me.
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Bjorn Andersson April 24, 2018, 10:14 p.m. UTC | #2 
On Tue 24 Apr 15:08 PDT 2018, Subhash Jadavani wrote:

> On 2018-04-23 17:20, Bjorn Andersson wrote:
> > devfreq requires that the client operates on actual frequencies, not
> > only 0 and UMAX_INT and as such UFS brok with the introduction of
> > f1d981eaecf8 ("PM / devfreq: Use the available min/max frequency").
> > 
> > This patch registers the frequencies of the first clock with devfreq and
> > use these to determine if we're trying to step up or down.
> > 
[..]
> 
> Looks good to me.
> Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
> 

Thanks Subhash. Unfortunately I need to respin this to register the opp
table based on our freq table, so there will be a v2 of this soon.

Regards,
Bjorn
diff mbox

Patch

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 2253f24309ec..07b1f3c7bd2d 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1168,16 +1168,13 @@  static int ufshcd_devfreq_target(struct device *dev,
 	struct ufs_hba *hba = dev_get_drvdata(dev);
 	ktime_t start;
 	bool scale_up, sched_clk_scaling_suspend_work = false;
+	struct list_head *clk_list = &hba->clk_list_head;
+	struct ufs_clk_info *clki;
 	unsigned long irq_flags;
 
 	if (!ufshcd_is_clkscaling_supported(hba))
 		return -EINVAL;
 
-	if ((*freq > 0) && (*freq < UINT_MAX)) {
-		dev_err(hba->dev, "%s: invalid freq = %lu\n", __func__, *freq);
-		return -EINVAL;
-	}
-
 	spin_lock_irqsave(hba->host->host_lock, irq_flags);
 	if (ufshcd_eh_in_progress(hba)) {
 		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
@@ -1187,7 +1184,13 @@  static int ufshcd_devfreq_target(struct device *dev,
 	if (!hba->clk_scaling.active_reqs)
 		sched_clk_scaling_suspend_work = true;
 
-	scale_up = (*freq == UINT_MAX) ? true : false;
+	if (list_empty(clk_list)) {
+		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
+		goto out;
+	}
+
+	clki = list_first_entry(&hba->clk_list_head, struct ufs_clk_info, list);
+	scale_up = (*freq == clki->max_freq) ? true : false;
 	if (!ufshcd_is_devfreq_scaling_required(hba, scale_up)) {
 		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
 		ret = 0;
@@ -1257,11 +1260,33 @@  static struct devfreq_dev_profile ufs_devfreq_profile = {
 
 static int ufshcd_devfreq_init(struct ufs_hba *hba)
 {
+	struct devfreq_dev_profile *profile;
+	struct list_head *clk_list = &hba->clk_list_head;
+	struct ufs_clk_info *clki;
 	struct devfreq *devfreq;
 	int ret;
 
+	/* Skip devfreq if we don't have any clocks in the list */
+	if (list_empty(clk_list))
+		return 0;
+
+	profile = devm_kmemdup(hba->dev, &ufs_devfreq_profile,
+			       sizeof(ufs_devfreq_profile), GFP_KERNEL);
+	if (!profile)
+		return -ENOMEM;
+
+	profile->max_state = 2;
+	profile->freq_table = devm_kcalloc(hba->dev, profile->max_state,
+					   sizeof(unsigned long), GFP_KERNEL);
+	if (!profile->freq_table)
+		return -ENOMEM;
+
+	clki = list_first_entry(&hba->clk_list_head, struct ufs_clk_info, list);
+	profile->freq_table[0] = clki->min_freq;
+	profile->freq_table[1] = clki->max_freq;
+
 	devfreq = devm_devfreq_add_device(hba->dev,
-			&ufs_devfreq_profile,
+			profile,
 			"simple_ondemand",
 			NULL);
 	if (IS_ERR(devfreq)) {