usb: dwc3: pci: add quirk for Baytrails

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@linux.intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index b773fb53d6a7cd09be0daee5f119279ada098e78..27e4fc896e9d93572c44acef20e25c6cea3a7d10 100644 (file)
--- 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);
+                       usleep_range(10000, 11000);
+               }
+       }
+
        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));
 }