Merge remote-tracking branch 'ufs/tracking-qcomlt-ufs' into integration-linux-qcomlt

7 files changed, 60 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
index a74720486ee2..d78ef63935f9 100644
--- a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
+++ b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
@@ -54,6 +54,8 @@ Optional properties:
 			  PHY reset from the UFS controller.
 - resets            : reset node register
 - reset-names       : describe reset node register, the "rst" corresponds to reset the whole UFS IP.
+- reset-gpios       : A phandle and gpio specifier denoting the GPIO connected
+		      to the RESET pin of the UFS memory device.
 
 Note: If above properties are not defined it can be assumed that the supply
 regulators or clocks are always on.
diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
index 71bd717a4251..f5a85caff1a3 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
@@ -497,6 +497,8 @@
 &ufs_mem_hc {
 	status = "okay";
 
+	reset-gpios = <&tlmm 150 GPIO_ACTIVE_LOW>;
+
 	vcc-supply = <&vreg_l20a_2p95>;
 	vcc-max-microamp = <800000>;
 };
diff --git a/arch/arm64/boot/dts/qcom/sdm845-mtp.dts b/arch/arm64/boot/dts/qcom/sdm845-mtp.dts
index 2e78638eb73b..c57548b7b250 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-mtp.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-mtp.dts
@@ -388,6 +388,8 @@
 &ufs_mem_hc {
 	status = "okay";
 
+	reset-gpios = <&tlmm 150 GPIO_ACTIVE_LOW>;
+
 	vcc-supply = <&vreg_l20a_2p95>;
 	vcc-max-microamp = <600000>;
 };
diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index ee4b1da1e223..5ee25434aaae 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -8,6 +8,7 @@
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/phy/phy.h>
+#include <linux/gpio/consumer.h>
 #include <linux/reset-controller.h>
 
 #include "ufshcd.h"
@@ -1140,6 +1141,15 @@ static int ufs_qcom_init(struct ufs_hba *hba)
 		}
 	}
 
+	host->device_reset = devm_gpiod_get_optional(dev, "reset",
+						     GPIOD_OUT_HIGH);
+	if (IS_ERR(host->device_reset)) {
+		err = PTR_ERR(host->device_reset);
+		if (err != -EPROBE_DEFER)
+			dev_err(dev, "failed to acquire reset gpio: %d\n", err);
+		goto out_variant_clear;
+	}
+
 	err = ufs_qcom_bus_register(host);
 	if (err)
 		goto out_variant_clear;
@@ -1546,6 +1556,31 @@ static void ufs_qcom_dump_dbg_regs(struct ufs_hba *hba)
 }
 
 /**
+ * ufs_qcom_device_reset() - toggle the (optional) device reset line
+ * @hba: per-adapter instance
+ *
+ * Toggles the (optional) reset line to reset the attached device.
+ */
+static void ufs_qcom_device_reset(struct ufs_hba *hba)
+{
+	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+
+	/* reset gpio is optional */
+	if (!host->device_reset)
+		return;
+
+	/*
+	 * The UFS device shall detect reset pulses of 1us, sleep for 10us to
+	 * be on the safe side.
+	 */
+	gpiod_set_value_cansleep(host->device_reset, 1);
+	usleep_range(10, 15);
+
+	gpiod_set_value_cansleep(host->device_reset, 0);
+	usleep_range(10, 15);
+}
+
+/**
  * struct ufs_hba_qcom_vops - UFS QCOM specific variant operations
  *
  * The variant operations configure the necessary controller and PHY
@@ -1565,6 +1600,7 @@ static struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
 	.suspend		= ufs_qcom_suspend,
 	.resume			= ufs_qcom_resume,
 	.dbg_register_dump	= ufs_qcom_dump_dbg_regs,
+	.device_reset		= ufs_qcom_device_reset,
 };
 
 /**
diff --git a/drivers/scsi/ufs/ufs-qcom.h b/drivers/scsi/ufs/ufs-qcom.h
index 001915d1e0e4..d401f174bb70 100644
--- a/drivers/scsi/ufs/ufs-qcom.h
+++ b/drivers/scsi/ufs/ufs-qcom.h
@@ -195,6 +195,8 @@ struct ufs_qcom_testbus {
 	u8 select_minor;
 };
 
+struct gpio_desc;
+
 struct ufs_qcom_host {
 	/*
 	 * Set this capability if host controller supports the QUniPro mode
@@ -232,6 +234,8 @@ struct ufs_qcom_host {
 	struct ufs_qcom_testbus testbus;
 
 	struct reset_controller_dev rcdev;
+
+	struct gpio_desc *device_reset;
 };
 
 static inline u32
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 029da74bb2f5..f900564174db 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6189,6 +6189,9 @@ static int ufshcd_reset_and_restore(struct ufs_hba *hba)
 	int retries = MAX_HOST_RESET_RETRIES;
 
 	do {
+		/* Reset the attached device */
+		ufshcd_vops_device_reset(hba);
+
 		err = ufshcd_host_reset_and_restore(hba);
 	} while (err && --retries);
 
@@ -8324,6 +8327,9 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 		goto exit_gating;
 	}
 
+	/* Reset the attached device */
+	ufshcd_vops_device_reset(hba);
+
 	/* Host controller enable */
 	err = ufshcd_hba_enable(hba);
 	if (err) {
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 994d73d03207..d29b9632d6ee 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -298,6 +298,7 @@ struct ufs_pwr_mode_info {
  * @resume: called during host controller PM callback
  * @dbg_register_dump: used to dump controller debug information
  * @phy_initialization: used to initialize phys
+ * @device_reset: called to issue a reset pulse on the UFS device
  */
 struct ufs_hba_variant_ops {
 	const char *name;
@@ -326,6 +327,7 @@ struct ufs_hba_variant_ops {
 	int     (*resume)(struct ufs_hba *, enum ufs_pm_op);
 	void	(*dbg_register_dump)(struct ufs_hba *hba);
 	int	(*phy_initialization)(struct ufs_hba *);
+	void	(*device_reset)(struct ufs_hba *hba);
 };
 
 /* clock gating state  */
@@ -1045,6 +1047,12 @@ static inline void ufshcd_vops_dbg_register_dump(struct ufs_hba *hba)
 		hba->vops->dbg_register_dump(hba);
 }
 
+static inline void ufshcd_vops_device_reset(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->device_reset)
+		hba->vops->device_reset(hba);
+}
+
 extern struct ufs_pm_lvl_states ufs_pm_lvl_states[];
 
 /*