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usb: dwc3-am62: add workaround for Errata i2409

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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

Signed-off-by: Roger Quadros <rogerq@kernel.org>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20240227-for-v6-9-am62-usb-errata-3-0-v4-4-0ada8ddb0767@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Roger Quadros
2024-02-27 11:23:51 +02:00
committed by Greg Kroah-Hartman
parent d78ff37567
commit f0b9c57840
1 changed files with 18 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/usb/dwc3/dwc3-am62.c
+18 -1
View File
@@ -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);
@@ -227,6 +233,17 @@ static int dwc3_ti_probe(struct platform_device *pdev)
if (ret)
return ret;
/* Workaround Errata i2409 */
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;
} else {
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);