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From:   justinpopo6@gmail.com
To:     alcooperx@gmail.com, kishon@ti.com, vkoul@kernel.org,
        f.fainelli@gmail.com, linux-kernel@vger.kernel.org,
        linux-phy@lists.infradead.org
Cc:     bcm-kernel-feedback-list@broadcom.com,
        Justin Chen <justinpopo6@gmail.com>
Subject: [PATCH 1/6] phy: usb: Improve port mode selection
Date:   Wed,  5 Oct 2022 14:30:13 -0700
Message-Id: <1665005418-15807-2-git-send-email-justinpopo6@gmail.com>
In-Reply-To: <1665005418-15807-1-git-send-email-justinpopo6@gmail.com>
References: <1665005418-15807-1-git-send-email-justinpopo6@gmail.com>
Precedence: bulk

From: Justin Chen <justinpopo6@gmail.com>

Split port modes into two different variables. Supported port modes
is what the hardware supports. While port mode is how the hardware
is currently configured and can be dynamically changed through the
sysfs. We initialize all supported port modes on init even though
the port mode may not be selected because we cannot guarantee the
downstream interface from the phy will be active or not.

This also fixes an issue where port modes selected via sysfs were
not being saved through suspend/resume.

Signed-off-by: Justin Chen <justinpopo6@gmail.com>
---
 drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c | 12 ++++++------
 drivers/phy/broadcom/phy-brcm-usb-init.c          | 10 +++++-----
 drivers/phy/broadcom/phy-brcm-usb-init.h          | 10 +++++-----
 drivers/phy/broadcom/phy-brcm-usb.c               | 14 +++++++++-----
 4 files changed, 25 insertions(+), 21 deletions(-)

diff --git a/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c b/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
index d2524b7..430a8ae 100644
--- a/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
+++ b/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
@@ -195,10 +195,10 @@ static void usb_init_common(struct brcm_usb_init_params *params)
 	if (USB_CTRL_MASK(USB_DEVICE_CTL1, PORT_MODE)) {
 		reg = brcm_usb_readl(USB_CTRL_REG(ctrl, USB_DEVICE_CTL1));
 		reg &= ~USB_CTRL_MASK(USB_DEVICE_CTL1, PORT_MODE);
-		reg |= params->mode;
+		reg |= params->port_mode;
 		brcm_usb_writel(reg, USB_CTRL_REG(ctrl, USB_DEVICE_CTL1));
 	}
-	switch (params->mode) {
+	switch (params->supported_port_modes) {
 	case USB_CTLR_MODE_HOST:
 		USB_CTRL_UNSET(ctrl, USB_PM, BDC_SOFT_RESETB);
 		break;
@@ -276,7 +276,7 @@ static void usb_init_common_7211b0(struct brcm_usb_init_params *params)
 	/* Set the PHY_MODE */
 	reg = brcm_usb_readl(usb_phy + USB_PHY_UTMI_CTL_1);
 	reg &= ~USB_PHY_UTMI_CTL_1_PHY_MODE_MASK;
-	reg |= params->mode << USB_PHY_UTMI_CTL_1_PHY_MODE_SHIFT;
+	reg |= params->supported_port_modes << USB_PHY_UTMI_CTL_1_PHY_MODE_SHIFT;
 	brcm_usb_writel(reg, usb_phy + USB_PHY_UTMI_CTL_1);
 
 	usb_init_common(params);
@@ -286,7 +286,7 @@ static void usb_init_common_7211b0(struct brcm_usb_init_params *params)
 	 * the default "Read Transaction Size" of 6 (1024 bytes).
 	 * Set it to 4 (256 bytes).
 	 */
-	if ((params->mode != USB_CTLR_MODE_HOST) && bdc_ec) {
+	if ((params->supported_port_modes != USB_CTLR_MODE_HOST) && bdc_ec) {
 		reg = brcm_usb_readl(bdc_ec + BDC_EC_AXIRDA);
 		reg &= ~BDC_EC_AXIRDA_RTS_MASK;
 		reg |= (0x4 << BDC_EC_AXIRDA_RTS_SHIFT);
@@ -385,7 +385,7 @@ static int usb_get_dual_select(struct brcm_usb_init_params *params)
 	return reg;
 }
 
-static void usb_set_dual_select(struct brcm_usb_init_params *params, int mode)
+static void usb_set_dual_select(struct brcm_usb_init_params *params)
 {
 	void __iomem *ctrl = params->regs[BRCM_REGS_CTRL];
 	u32 reg;
@@ -394,7 +394,7 @@ static void usb_set_dual_select(struct brcm_usb_init_params *params, int mode)
 
 	reg = brcm_usb_readl(USB_CTRL_REG(ctrl, USB_DEVICE_CTL1));
 	reg &= ~USB_CTRL_MASK(USB_DEVICE_CTL1, PORT_MODE);
-	reg |= mode;
+	reg |= params->port_mode;
 	brcm_usb_writel(reg, USB_CTRL_REG(ctrl, USB_DEVICE_CTL1));
 }
 
diff --git a/drivers/phy/broadcom/phy-brcm-usb-init.c b/drivers/phy/broadcom/phy-brcm-usb-init.c
index dddcbd3..a7f8b3d 100644
--- a/drivers/phy/broadcom/phy-brcm-usb-init.c
+++ b/drivers/phy/broadcom/phy-brcm-usb-init.c
@@ -876,11 +876,11 @@ static void usb_init_common(struct brcm_usb_init_params *params)
 		reg = brcm_usb_readl(USB_CTRL_REG(ctrl, USB_DEVICE_CTL1));
 		reg &= ~USB_CTRL_MASK_FAMILY(params, USB_DEVICE_CTL1,
 					PORT_MODE);
-		reg |= params->mode;
+		reg |= params->port_mode;
 		brcm_usb_writel(reg, USB_CTRL_REG(ctrl, USB_DEVICE_CTL1));
 	}
 	if (USB_CTRL_MASK_FAMILY(params, USB_PM, BDC_SOFT_RESETB)) {
-		switch (params->mode) {
+		switch (params->supported_port_modes) {
 		case USB_CTLR_MODE_HOST:
 			USB_CTRL_UNSET_FAMILY(params, USB_PM, BDC_SOFT_RESETB);
 			break;
@@ -891,7 +891,7 @@ static void usb_init_common(struct brcm_usb_init_params *params)
 		}
 	}
 	if (USB_CTRL_MASK_FAMILY(params, SETUP, CC_DRD_MODE_ENABLE)) {
-		if (params->mode == USB_CTLR_MODE_TYPEC_PD)
+		if (params->supported_port_modes == USB_CTLR_MODE_TYPEC_PD)
 			USB_CTRL_SET_FAMILY(params, SETUP, CC_DRD_MODE_ENABLE);
 		else
 			USB_CTRL_UNSET_FAMILY(params, SETUP,
@@ -1000,7 +1000,7 @@ static int usb_get_dual_select(struct brcm_usb_init_params *params)
 	return reg;
 }
 
-static void usb_set_dual_select(struct brcm_usb_init_params *params, int mode)
+static void usb_set_dual_select(struct brcm_usb_init_params *params)
 {
 	void __iomem *ctrl = params->regs[BRCM_REGS_CTRL];
 	u32 reg;
@@ -1011,7 +1011,7 @@ static void usb_set_dual_select(struct brcm_usb_init_params *params, int mode)
 		reg = brcm_usb_readl(USB_CTRL_REG(ctrl, USB_DEVICE_CTL1));
 		reg &= ~USB_CTRL_MASK_FAMILY(params, USB_DEVICE_CTL1,
 					PORT_MODE);
-		reg |= mode;
+		reg |= params->port_mode;
 		brcm_usb_writel(reg, USB_CTRL_REG(ctrl, USB_DEVICE_CTL1));
 	}
 }
diff --git a/drivers/phy/broadcom/phy-brcm-usb-init.h b/drivers/phy/broadcom/phy-brcm-usb-init.h
index 1ccb5dd..bedf2b8 100644
--- a/drivers/phy/broadcom/phy-brcm-usb-init.h
+++ b/drivers/phy/broadcom/phy-brcm-usb-init.h
@@ -45,14 +45,15 @@ struct brcm_usb_init_ops {
 	void (*uninit_eohci)(struct brcm_usb_init_params *params);
 	void (*uninit_xhci)(struct brcm_usb_init_params *params);
 	int  (*get_dual_select)(struct brcm_usb_init_params *params);
-	void (*set_dual_select)(struct brcm_usb_init_params *params, int mode);
+	void (*set_dual_select)(struct brcm_usb_init_params *params);
 };
 
 struct  brcm_usb_init_params {
 	void __iomem *regs[BRCM_REGS_MAX];
 	int ioc;
 	int ipp;
-	int mode;
+	int supported_port_modes;
+	int port_mode;
 	u32 family_id;
 	u32 product_id;
 	int selected_family;
@@ -153,11 +154,10 @@ static inline int brcm_usb_get_dual_select(struct brcm_usb_init_params *ini)
 	return 0;
 }
 
-static inline void brcm_usb_set_dual_select(struct brcm_usb_init_params *ini,
-	int mode)
+static inline void brcm_usb_set_dual_select(struct brcm_usb_init_params *ini)
 {
 	if (ini->ops->set_dual_select)
-		ini->ops->set_dual_select(ini, mode);
+		ini->ops->set_dual_select(ini);
 }
 
 #endif /* _USB_BRCM_COMMON_INIT_H */
diff --git a/drivers/phy/broadcom/phy-brcm-usb.c b/drivers/phy/broadcom/phy-brcm-usb.c
index 2cb3779..99d4dea 100644
--- a/drivers/phy/broadcom/phy-brcm-usb.c
+++ b/drivers/phy/broadcom/phy-brcm-usb.c
@@ -233,7 +233,7 @@ static ssize_t dr_mode_show(struct device *dev,
 	return sprintf(buf, "%s\n",
 		value_to_name(&brcm_dr_mode_to_name[0],
 			      ARRAY_SIZE(brcm_dr_mode_to_name),
-			      priv->ini.mode));
+			      priv->ini.supported_port_modes));
 }
 static DEVICE_ATTR_RO(dr_mode);
 
@@ -249,7 +249,8 @@ static ssize_t dual_select_store(struct device *dev,
 	res = name_to_value(&brcm_dual_mode_to_name[0],
 			    ARRAY_SIZE(brcm_dual_mode_to_name), buf, &value);
 	if (!res) {
-		brcm_usb_set_dual_select(&priv->ini, value);
+		priv->ini.port_mode = value;
+		brcm_usb_set_dual_select(&priv->ini);
 		res = len;
 	}
 	mutex_unlock(&sysfs_lock);
@@ -495,13 +496,16 @@ static int brcm_usb_phy_probe(struct platform_device *pdev)
 	of_property_read_u32(dn, "brcm,ipp", &priv->ini.ipp);
 	of_property_read_u32(dn, "brcm,ioc", &priv->ini.ioc);
 
-	priv->ini.mode = USB_CTLR_MODE_HOST;
+	priv->ini.supported_port_modes = USB_CTLR_MODE_HOST;
 	err = of_property_read_string(dn, "dr_mode", &mode);
 	if (err == 0) {
 		name_to_value(&brcm_dr_mode_to_name[0],
 			      ARRAY_SIZE(brcm_dr_mode_to_name),
-			mode, &priv->ini.mode);
+			mode, &priv->ini.supported_port_modes);
 	}
+	/* Default port_mode to supported port_modes */
+	priv->ini.port_mode = priv->ini.supported_port_modes;
+
 	if (of_property_read_bool(dn, "brcm,has-xhci"))
 		priv->has_xhci = true;
 	if (of_property_read_bool(dn, "brcm,has-eohci"))
@@ -539,7 +543,7 @@ static int brcm_usb_phy_probe(struct platform_device *pdev)
 	 * Create sysfs entries for mode.
 	 * Remove "dual_select" attribute if not in dual mode
 	 */
-	if (priv->ini.mode != USB_CTLR_MODE_DRD)
+	if (priv->ini.supported_port_modes != USB_CTLR_MODE_DRD)
 		brcm_usb_phy_attrs[1] = NULL;
 	err = sysfs_create_group(&dev->kobj, &brcm_usb_phy_group);
 	if (err)
-- 
2.7.4