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Date:   Sat,  2 May 2020 13:47:50 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     kishon@...com, robh+dt@...nel.org, vkoul@...nel.org,
        devicetree@...r.kernel.org, linux-amlogic@...ts.infradead.org
Cc:     narmstrong@...libre.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, hexdump0815@...glemail.com,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH 4/6] phy: amlogic: meson8b-usb2: Don't set REG_ADP_BC_ACA_ENABLE on Meson8

Skip setting REG_ADP_BC_ACA_ENABLE on Meson8 SoCs and polling for the
REG_ADP_BC_ACA_PIN_FLOAT bit. The vendor also skips this part on Meson8
SoCs.
This fixes initialization of the host-only USB PHY on Meson8 which would
otherwise fail with "USB ID detect failed!".

Fixes: 4a3449d1a0a10c ("phy: meson8b-usb2: add support for the USB PHY on Meson8 SoCs")
Reported-by: hexdump <hexdump0815@...glemail.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 drivers/phy/amlogic/phy-meson8b-usb2.c | 48 ++++++++++++++++++++------
 1 file changed, 38 insertions(+), 10 deletions(-)

diff --git a/drivers/phy/amlogic/phy-meson8b-usb2.c b/drivers/phy/amlogic/phy-meson8b-usb2.c
index 86824cc21f11..7236b8885f07 100644
--- a/drivers/phy/amlogic/phy-meson8b-usb2.c
+++ b/drivers/phy/amlogic/phy-meson8b-usb2.c
@@ -10,6 +10,7 @@
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
 #include <linux/phy/phy.h>
@@ -105,12 +106,17 @@
 #define RESET_COMPLETE_TIME				500
 #define ACA_ENABLE_COMPLETE_TIME			50
 
+struct phy_meson8b_usb2_match_data {
+	bool			host_enable_aca;
+};
+
 struct phy_meson8b_usb2_priv {
-	struct regmap		*regmap;
-	enum usb_dr_mode	dr_mode;
-	struct clk		*clk_usb_general;
-	struct clk		*clk_usb;
-	struct reset_control	*reset;
+	struct regmap					*regmap;
+	enum usb_dr_mode				dr_mode;
+	struct clk					*clk_usb_general;
+	struct clk					*clk_usb;
+	struct reset_control				*reset;
+	const struct phy_meson8b_usb2_match_data	*match;
 };
 
 static const struct regmap_config phy_meson8b_usb2_regmap_conf = {
@@ -166,7 +172,8 @@ static int phy_meson8b_usb2_power_on(struct phy *phy)
 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_SOF_TOGGLE_OUT,
 			   REG_CTRL_SOF_TOGGLE_OUT);
 
-	if (priv->dr_mode == USB_DR_MODE_HOST) {
+	if (priv->dr_mode == USB_DR_MODE_HOST &&
+	    priv->match->host_enable_aca) {
 		regmap_update_bits(priv->regmap, REG_ADP_BC,
 				   REG_ADP_BC_ACA_ENABLE,
 				   REG_ADP_BC_ACA_ENABLE);
@@ -216,6 +223,10 @@ static int phy_meson8b_usb2_probe(struct platform_device *pdev)
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
+	priv->match = device_get_match_data(&pdev->dev);
+	if (!priv->match)
+		return -ENODEV;
+
 	priv->regmap = devm_regmap_init_mmio(&pdev->dev, base,
 					     &phy_meson8b_usb2_regmap_conf);
 	if (IS_ERR(priv->regmap))
@@ -254,11 +265,28 @@ static int phy_meson8b_usb2_probe(struct platform_device *pdev)
 	return PTR_ERR_OR_ZERO(phy_provider);
 }
 
+static const struct phy_meson8b_usb2_match_data phy_meson8_usb2_match_data = {
+	.host_enable_aca = false,
+};
+
+static const struct phy_meson8b_usb2_match_data phy_meson8b_usb2_match_data = {
+	.host_enable_aca = true,
+};
+
 static const struct of_device_id phy_meson8b_usb2_of_match[] = {
-	{ .compatible = "amlogic,meson8-usb2-phy", },
-	{ .compatible = "amlogic,meson8b-usb2-phy", },
-	{ .compatible = "amlogic,meson-gxbb-usb2-phy", },
-	{ },
+	{
+		.compatible = "amlogic,meson8-usb2-phy",
+		.data = &phy_meson8_usb2_match_data
+	},
+	{
+		.compatible = "amlogic,meson8b-usb2-phy",
+		.data = &phy_meson8b_usb2_match_data
+	},
+	{
+		.compatible = "amlogic,meson-gxbb-usb2-phy",
+		.data = &phy_meson8b_usb2_match_data
+	},
+	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, phy_meson8b_usb2_of_match);
 
-- 
2.26.2

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