scsi: ufshcd: Let vendor override devfreq parameters

Vendor drivers may have a need to update the polling interval and
thresholds.  Provide a vops for vendor drivers to use.

Link: https://lore.kernel.org/r/acd79e00396cff855256adad47f615ccdbde85ac.1585160616.git.asutoshd@codeaurora.org
Acked-by: Avri Altman <Avri.Altman@wdc.com>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 95e68a6..145b67f 100644 (file)
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1315,6 +1315,17 @@ static struct devfreq_dev_profile ufs_devfreq_profile = {
        .get_dev_status = ufshcd_devfreq_get_dev_status,
 };
 
+#if IS_ENABLED(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND)
+static struct devfreq_simple_ondemand_data ufs_ondemand_data = {
+       .upthreshold = 70,
+       .downdifferential = 5,
+};
+
+static void *gov_data = &ufs_ondemand_data;
+#else
+static void *gov_data; /* NULL */
+#endif
+
 static int ufshcd_devfreq_init(struct ufs_hba *hba)
 {
        struct list_head *clk_list = &hba->clk_list_head;
@@ -1330,10 +1341,12 @@ static int ufshcd_devfreq_init(struct ufs_hba *hba)
        dev_pm_opp_add(hba->dev, clki->min_freq, 0);
        dev_pm_opp_add(hba->dev, clki->max_freq, 0);
 
+       ufshcd_vops_config_scaling_param(hba, &ufs_devfreq_profile,
+                                        gov_data);
        devfreq = devfreq_add_device(hba->dev,
                        &ufs_devfreq_profile,
                        DEVFREQ_GOV_SIMPLE_ONDEMAND,
-                       NULL);
+                       gov_data);
        if (IS_ERR(devfreq)) {
                ret = PTR_ERR(devfreq);
                dev_err(hba->dev, "Unable to register with devfreq %d\n", ret);

diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 9f1576b..fce7606 100644 (file)
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -56,6 +56,7 @@
 #include <linux/completion.h>
 #include <linux/regulator/consumer.h>
 #include <linux/bitfield.h>
+#include <linux/devfreq.h>
 #include "unipro.h"
 
 #include <asm/irq.h>
@@ -327,6 +328,9 @@ struct ufs_hba_variant_ops {
        void    (*dbg_register_dump)(struct ufs_hba *hba);
        int     (*phy_initialization)(struct ufs_hba *);
        void    (*device_reset)(struct ufs_hba *hba);
+       void    (*config_scaling_param)(struct ufs_hba *hba,
+                                       struct devfreq_dev_profile *profile,
+                                       void *data);
 };
 
 /* clock gating state  */
@@ -1094,6 +1098,14 @@ static inline void ufshcd_vops_device_reset(struct ufs_hba *hba)
        }
 }
 
+static inline void ufshcd_vops_config_scaling_param(struct ufs_hba *hba,
+                                                   struct devfreq_dev_profile
+                                                   *profile, void *data)
+{
+       if (hba->vops && hba->vops->config_scaling_param)
+               hba->vops->config_scaling_param(hba, profile, data);
+}
+
 extern struct ufs_pm_lvl_states ufs_pm_lvl_states[];
 
 /*