linux-kernel - [PATCH V2 2/3] scsi: ufs: add a vops to configure VCC voltage level

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Date:   Mon, 22 Mar 2021 03:27:36 +0530
From:   Nitin Rawat <nitirawa@...eaurora.org>
To:     asutoshd@...eaurora.org, cang@...eaurora.org,
        stummala@...eaurora.org, vbadigan@...eaurora.org,
        alim.akhtar@...sung.com, avri.altman@....com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, bjorn.andersson@...aro.org,
        adrian.hunter@...el.com, bvanassche@....org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nitin Rawat <nitirawa@...eaurora.org>
Subject: [PATCH V2 2/3] scsi: ufs: add a vops to configure VCC voltage level

Add a vops to configure VCC voltage VCC voltage level
for platform supporting both ufs2.x and ufs 3.x devices.

Suggested-by: Stanley Chu <stanley.chu@...iatek.com>
Suggested-by: Asutosh Das <asutoshd@...eaurora.org>
Suggested-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Nitin Rawat <nitirawa@...eaurora.org>
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
---
 drivers/scsi/ufs/ufshcd.c |  4 ++++
 drivers/scsi/ufs/ufshcd.h | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 633ca8e..5bfe987 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7763,6 +7763,10 @@ static int ufshcd_add_lus(struct ufs_hba *hba)
 		goto out;

 	ufshcd_clear_ua_wluns(hba);
+	if (ufshcd_vops_setup_vcc_regulators(hba))
+		dev_err(hba->dev,
+			"%s: Failed to set the VCC regulator values, continue with 2.7v\n",
+			__func__);

 	/* Initialize devfreq after UFS device is detected */
 	if (ufshcd_is_clkscaling_supported(hba)) {
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 0db796a..8f0945d 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -324,6 +324,7 @@ struct ufs_pwr_mode_info {
  * @device_reset: called to issue a reset pulse on the UFS device
  * @program_key: program or evict an inline encryption key
  * @event_notify: called to notify important events
+ * @setup_vcc_regulators : update vcc regulator level
  */
 struct ufs_hba_variant_ops {
 	const char *name;
@@ -360,6 +361,7 @@ struct ufs_hba_variant_ops {
 			       const union ufs_crypto_cfg_entry *cfg, int slot);
 	void	(*event_notify)(struct ufs_hba *hba,
 				enum ufs_event_type evt, void *data);
+	int    (*setup_vcc_regulators)(struct ufs_hba *hba);
 };

 /* clock gating state  */
@@ -1269,6 +1271,14 @@ static inline void ufshcd_vops_config_scaling_param(struct ufs_hba *hba,
 		hba->vops->config_scaling_param(hba, profile, data);
 }

+static inline int ufshcd_vops_setup_vcc_regulators(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->setup_vcc_regulators)
+		return hba->vops->setup_vcc_regulators(hba);
+
+	return 0;
+}
+
 extern struct ufs_pm_lvl_states ufs_pm_lvl_states[];

 /*
--
2.7.4