On some BYT platforms the USB2 PHY needs to be put into
operational mode by the controller driver with GPIOs
controlling the PHYs reset and cs signals.
Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/dwc3-pci.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index b773fb5..0235f46 100644
--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -21,6 +21,8 @@
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/acpi.h>
#include "platform_data.h"
@@ -31,6 +33,15 @@
#define PCI_DEVICE_ID_INTEL_SPTLP 0x9d30
#define PCI_DEVICE_ID_INTEL_SPTH 0xa130
+static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
+static const struct acpi_gpio_params cs_gpios = { 1, 0, false };
+
+static const struct acpi_gpio_mapping acpi_dwc3_byt_gpios[] = {
+ { "reset-gpios", &reset_gpios, 1 },
+ { "cs-gpios", &cs_gpios, 1 },
+ { },
+};
+
static int dwc3_pci_quirks(struct pci_dev *pdev)
{
if (pdev->vendor == PCI_VENDOR_ID_AMD &&
@@ -65,6 +76,30 @@ static int dwc3_pci_quirks(struct pci_dev *pdev)
sizeof(pdata));
}
+ if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
+ pdev->device == PCI_DEVICE_ID_INTEL_BYT) {
+ struct gpio_desc *gpio;
+
+ acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
+ acpi_dwc3_byt_gpios);
+
+ /* These GPIOs will turn on the USB2 PHY */
+ gpio = gpiod_get(&pdev->dev, "cs");
+ if (!IS_ERR(gpio)) {
+ gpiod_direction_output(gpio, 0);
+ gpiod_set_value_cansleep(gpio, 1);
+ gpiod_put(gpio);
+ }
+
+ gpio = gpiod_get(&pdev->dev, "reset");
+ if (!IS_ERR(gpio)) {
+ gpiod_direction_output(gpio, 0);
+ gpiod_set_value_cansleep(gpio, 1);
+ gpiod_put(gpio);
+ msleep(10);
+ }
+ }
+
return 0;
}
@@ -128,6 +163,7 @@ err:
static void dwc3_pci_remove(struct pci_dev *pci)
{
+ acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pci->dev));
platform_device_unregister(pci_get_drvdata(pci));
}
--
2.1.4
--
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