[PATCH v6 0/2] phy: omap-usb2-phy: Errata and coding style fix

[PATCH v6 0/2] phy: omap-usb2-phy: Errata and coding style fix

[Roger Quadros]

Hi,

This series addresses silicon errata
i2075 - "USB2PHY: USB2PHY Charger Detect is Enabled by Default
Without VBUS Presence"

It also fixes coding style issues.

cheers,
-roger

Changelog:

v6
- move coding style fixes to separate patch

v5
- don't use dt property to enable workaround.
  Use soc_device_match() instead.

v4
- fix example to fix dt_binding_check warnings
- '#phy-cells' -> "#phy-cells"
- Add 'oneOf' to compatible logic to allow just "ti,omap-usb2" as valid

v3
- Removed quotes from compatibles
- changed property to "ti,disable-charger-det"

v2
- Address Rob's comments on YAML schema.

Roger Quadros (2):
  phy: omap-usb2-phy: disable PHY charger detect
  phy: omap-usb2-phy: fix coding style issues

 drivers/phy/ti/phy-omap-usb2.c | 83 +++++++++++++++++++++++-----------
 1 file changed, 57 insertions(+), 26 deletions(-)

-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

[PATCH v6 1/2] phy: omap-usb2-phy: disable PHY charger detect

[Roger Quadros]

AM654x PG1.0 has a silicon bug that D+ is pulled high after POR, which
could cause enumeration failure with some USB hubs.  Disabling the
USB2_PHY Charger Detect function will put D+ into the normal state.

This addresses Silicon Errata:
i2075 - "USB2PHY: USB2PHY Charger Detect is Enabled by Default Without VBUS
Presence"

Signed-off-by: Roger Quadros <rogerq@ti.com>
Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 drivers/phy/ti/phy-omap-usb2.c | 47 +++++++++++++++++++++++++++++-----
 1 file changed, 40 insertions(+), 7 deletions(-)

diff --git a/drivers/phy/ti/phy-omap-usb2.c b/drivers/phy/ti/phy-omap-usb2.c
index cb2dd3230fa7..507f79d14adb 100644
--- a/drivers/phy/ti/phy-omap-usb2.c
+++ b/drivers/phy/ti/phy-omap-usb2.c
@@ -22,10 +22,15 @@
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
 #include <linux/of_platform.h>
+#include <linux/sys_soc.h>
 
 #define USB2PHY_ANA_CONFIG1		0x4c
 #define USB2PHY_DISCON_BYP_LATCH	BIT(31)
 
+#define USB2PHY_CHRG_DET			0x14
+#define USB2PHY_CHRG_DET_USE_CHG_DET_REG	BIT(29)
+#define USB2PHY_CHRG_DET_DIS_CHG_DET		BIT(28)
+
 /* SoC Specific USB2_OTG register definitions */
 #define AM654_USB2_OTG_PD		BIT(8)
 #define AM654_USB2_VBUS_DET_EN		BIT(5)
@@ -43,6 +48,7 @@
 #define OMAP_USB2_HAS_START_SRP			BIT(0)
 #define OMAP_USB2_HAS_SET_VBUS			BIT(1)
 #define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT	BIT(2)
+#define OMAP_USB2_DISABLE_CHRG_DET		BIT(3)
 
 struct omap_usb {
 	struct usb_phy		phy;
@@ -236,6 +242,13 @@ static int omap_usb_init(struct phy *x)
 		omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
 	}
 
+	if (phy->flags & OMAP_USB2_DISABLE_CHRG_DET) {
+		val = omap_usb_readl(phy->phy_base, USB2PHY_CHRG_DET);
+		val |= USB2PHY_CHRG_DET_USE_CHG_DET_REG |
+		       USB2PHY_CHRG_DET_DIS_CHG_DET;
+		omap_usb_writel(phy->phy_base, USB2PHY_CHRG_DET, val);
+	}
+
 	return 0;
 }
 
@@ -329,6 +342,26 @@ static const struct of_device_id omap_usb2_id_table[] = {
 };
 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
 
+static void omap_usb2_init_errata(struct omap_usb *phy)
+{
+	static const struct soc_device_attribute am65x_sr10_soc_devices[] = {
+		{ .family = "AM65X", .revision = "SR1.0" },
+		{ /* sentinel */ }
+	};
+
+	/*
+	 * Errata i2075: USB2PHY: USB2PHY Charger Detect is Enabled by
+	 * Default Without VBUS Presence.
+	 *
+	 * AM654x SR1.0 has a silicon bug due to which D+ is pulled high after
+	 * POR, which could cause enumeration failure with some USB hubs.
+	 * Disabling the USB2_PHY Charger Detect function will put D+
+	 * into the normal state.
+	 */
+	if (soc_device_match(am65x_sr10_soc_devices))
+		phy->flags |= OMAP_USB2_DISABLE_CHRG_DET;
+}
+
 static int omap_usb2_probe(struct platform_device *pdev)
 {
 	struct omap_usb	*phy;
@@ -366,14 +399,14 @@ static int omap_usb2_probe(struct platform_device *pdev)
 	phy->mask		= phy_data->mask;
 	phy->power_on		= phy_data->power_on;
 	phy->power_off		= phy_data->power_off;
+	phy->flags		= phy_data->flags;
 
-	if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
-		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-		phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
-		if (IS_ERR(phy->phy_base))
-			return PTR_ERR(phy->phy_base);
-		phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
-	}
+	omap_usb2_init_errata(phy);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(phy->phy_base))
+		return PTR_ERR(phy->phy_base);
 
 	phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
 							"syscon-phy-power");
-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

[PATCH v6 2/2] phy: omap-usb2-phy: fix coding style issues

[Roger Quadros]

Fix checkpatch warnings and sort the include files alphabetically.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 drivers/phy/ti/phy-omap-usb2.c | 36 ++++++++++++++++------------------
 1 file changed, 17 insertions(+), 19 deletions(-)

diff --git a/drivers/phy/ti/phy-omap-usb2.c b/drivers/phy/ti/phy-omap-usb2.c
index 507f79d14adb..4fec90d2624f 100644
--- a/drivers/phy/ti/phy-omap-usb2.c
+++ b/drivers/phy/ti/phy-omap-usb2.c
@@ -6,23 +6,23 @@
  * Author: Kishon Vijay Abraham I <kishon@ti.com>
  */
 
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/of.h>
-#include <linux/io.h>
-#include <linux/phy/omap_usb.h>
-#include <linux/usb/phy_companion.h>
 #include <linux/clk.h>
-#include <linux/err.h>
-#include <linux/pm_runtime.h>
 #include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
 #include <linux/phy/omap_control_phy.h>
+#include <linux/phy/omap_usb.h>
 #include <linux/phy/phy.h>
-#include <linux/mfd/syscon.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
-#include <linux/of_platform.h>
+#include <linux/slab.h>
 #include <linux/sys_soc.h>
+#include <linux/usb/phy_companion.h>
 
 #define USB2PHY_ANA_CONFIG1		0x4c
 #define USB2PHY_DISCON_BYP_LATCH	BIT(31)
@@ -89,7 +89,7 @@ static inline void omap_usb_writel(void __iomem *addr, unsigned int offset,
 }
 
 /**
- * omap_usb2_set_comparator - links the comparator present in the sytem with
+ * omap_usb2_set_comparator - links the comparator present in the system with
  *	this phy
  * @comparator - the companion phy(comparator) for this phy
  *
@@ -142,7 +142,7 @@ static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
 }
 
 static int omap_usb_set_peripheral(struct usb_otg *otg,
-		struct usb_gadget *gadget)
+				   struct usb_gadget *gadget)
 {
 	otg->gadget = gadget;
 	if (!gadget)
@@ -409,7 +409,7 @@ static int omap_usb2_probe(struct platform_device *pdev)
 		return PTR_ERR(phy->phy_base);
 
 	phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
-							"syscon-phy-power");
+								"syscon-phy-power");
 	if (IS_ERR(phy->syscon_phy_power)) {
 		dev_dbg(&pdev->dev,
 			"can't get syscon-phy-power, using control device\n");
@@ -438,7 +438,6 @@ static int omap_usb2_probe(struct platform_device *pdev)
 		}
 	}
 
-
 	phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
 	if (IS_ERR(phy->wkupclk)) {
 		if (PTR_ERR(phy->wkupclk) == -EPROBE_DEFER)
@@ -452,10 +451,10 @@ static int omap_usb2_probe(struct platform_device *pdev)
 			if (PTR_ERR(phy->wkupclk) != -EPROBE_DEFER)
 				dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
 			return PTR_ERR(phy->wkupclk);
-		} else {
-			dev_warn(&pdev->dev,
-				 "found usb_phy_cm_clk32k, please fix DTS\n");
 		}
+
+		dev_warn(&pdev->dev,
+			 "found usb_phy_cm_clk32k, please fix DTS\n");
 	}
 
 	phy->optclk = devm_clk_get(phy->dev, "refclk");
@@ -504,7 +503,6 @@ static int omap_usb2_probe(struct platform_device *pdev)
 		return PTR_ERR(phy_provider);
 	}
 
-
 	usb_add_phy_dev(&phy->phy);
 
 	return 0;
-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

Re: [PATCH v6 0/2] phy: omap-usb2-phy: Errata and coding style fix

[Vinod Koul]

On 24-08-20, 10:51, Roger Quadros wrote:
> Hi,
> 
> This series addresses silicon errata
> i2075 - "USB2PHY: USB2PHY Charger Detect is Enabled by Default
> Without VBUS Presence"
> 
> It also fixes coding style issues.

Applied, thanks

-- 
~Vinod