On 2018-05-04 15:44, 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 as opp levels and use these to determine if we're trying to step up or down. Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> --- Chances since v1: - Register min_freq and max_freq as opp levels. - Unregister opp levels on removal, to make e.g. probe defer working drivers/scsi/ufs/ufshcd.c | 47 +++++++++++++++++++++++++++++++++------ 1 file changed, 40 insertions(+), 7 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 2253f24309ec..257614b889bd 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(clk_list, 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; @@ -1257,16 +1260,29 @@ static struct devfreq_dev_profile ufs_devfreq_profile = { static int ufshcd_devfreq_init(struct ufs_hba *hba) { + struct list_head *clk_list = &hba->clk_list_head; + struct ufs_clk_info *clki; struct devfreq *devfreq; int ret; - devfreq = devm_devfreq_add_device(hba->dev, + /* Skip devfreq if we don't have any clocks in the list */ + if (list_empty(clk_list)) + return 0; + + clki = list_first_entry(clk_list, struct ufs_clk_info, list); + dev_pm_opp_add(hba->dev, clki->min_freq, 0); + dev_pm_opp_add(hba->dev, clki->max_freq, 0); + + devfreq = devfreq_add_device(hba->dev, &ufs_devfreq_profile, "simple_ondemand", NULL); if (IS_ERR(devfreq)) { ret = PTR_ERR(devfreq); dev_err(hba->dev, "Unable to register with devfreq %d\n", ret); + + dev_pm_opp_remove(hba->dev, clki->min_freq); + dev_pm_opp_remove(hba->dev, clki->max_freq); return ret; }@@ -1275,6 +1291,22 @@ static int ufshcd_devfreq_init(struct ufs_hba *hba)return 0; } +static void ufshcd_devfreq_remove(struct ufs_hba *hba) +{ + struct list_head *clk_list = &hba->clk_list_head; + struct ufs_clk_info *clki; + + if (!hba->devfreq) + return; + + devfreq_remove_device(hba->devfreq); + hba->devfreq = NULL; + + clki = list_first_entry(clk_list, struct ufs_clk_info, list); + dev_pm_opp_remove(hba->dev, clki->min_freq); + dev_pm_opp_remove(hba->dev, clki->max_freq); +} + static void __ufshcd_suspend_clkscaling(struct ufs_hba *hba) { unsigned long flags; @@ -6966,6 +6998,7 @@ static void ufshcd_hba_exit(struct ufs_hba *hba) if (hba->devfreq) ufshcd_suspend_clkscaling(hba); destroy_workqueue(hba->clk_scaling.workq); + ufshcd_devfreq_remove(hba); } ufshcd_setup_clocks(hba, false); ufshcd_setup_hba_vreg(hba, false);
Looks good to me. Reviewed-by: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx> -- The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
