[PATCH v2 5/5] usb: dwc3-am62: add workaround for Errata i2409

Roger Quadros
2024-02-05T14:12:43Z

All AM62 devices have Errata i2409 [1] due to which
USB2 PHY may lock up due to short suspend.

Workaround involves setting bit 5 and 4 PLL_REG12
in PHY2 register space after USB controller is brought
out of LPSC reset but before controller initialization.

Handle this workaround.

[1] - https://www.ti.com/lit/er/sprz487d/sprz487d.pdf

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
Cc: Conor Dooley <conor+dt@kernel.org>
Signed-off-by: Roger Quadros <rogerq@kernel.org>
---

Notes:
Changelog:

v2:
- don't add phy read/write helpers or add phy to private data

v1: https://lore.kernel.org/all/20240201121220.5523-5-rogerq@kernel.org/

drivers/usb/dwc3/dwc3-am62.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/dwc3-am62.c b/drivers/usb/dwc3/dwc3-am62.c
index af1ce934e7fb..5ae5c3087b0f 100644
--- a/drivers/usb/dwc3/dwc3-am62.c
+++ b/drivers/usb/dwc3/dwc3-am62.c
@@ -101,6 +101,11 @@
#define PHY_CORE_VOLTAGE_MASK BIT(31)
#define PHY_PLL_REFCLK_MASK GENMASK(3, 0)

+/* USB PHY2 register offsets */
+#define USB_PHY_PLL_REG12 0x130
+#define USB_PHY_PLL_LDO_REF_EN BIT(5)
+#define USB_PHY_PLL_LDO_REF_EN_EN BIT(4)
+
#define DWC3_AM62_AUTOSUSPEND_DELAY 100

struct dwc3_am62 {
@@ -184,8 +189,9 @@ static int dwc3_ti_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct device_node *node = pdev->dev.of_node;
struct dwc3_am62 *am62;
- int i, ret;
unsigned long rate;
+ void __iomem *phy;
+ int i, ret;
u32 reg;

am62 = devm_kzalloc(dev, sizeof(*am62), GFP_KERNEL);
@@ -201,6 +207,12 @@ static int dwc3_ti_probe(struct platform_device *pdev)
return PTR_ERR(am62->usbss);
}

+ phy = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(phy)) {
+ dev_err(dev, "can't map PHY IOMEM resource. Won't apply i2409 fix.\n");
+ phy = NULL;
+ }
+
am62->usb2_refclk = devm_clk_get(dev, "ref");
if (IS_ERR(am62->usb2_refclk)) {
dev_err(dev, "can't get usb2_refclk\n");
@@ -227,6 +239,13 @@ static int dwc3_ti_probe(struct platform_device *pdev)
if (ret)
return ret;

+ /* Workaround Errata i2409 */
+ if (phy) {
+ reg = readl(phy + USB_PHY_PLL_REG12);
+ reg |= USB_PHY_PLL_LDO_REF_EN | USB_PHY_PLL_LDO_REF_EN_EN;
+ writel(reg, phy + USB_PHY_PLL_REG12);
+ }
+
/* VBUS divider select */
am62->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider");
reg = dwc3_ti_readl(am62, USBSS_PHY_CONFIG);
--
2.34.1