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usb: dwc3: pci: add quirk for Baytrails

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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>
This commit is contained in:
Heikki Krogerus 2015-05-13 15:26:50 +03:00 committed by Felipe Balbi
parent 3e10a2ce98
commit a89d977cc0
1 changed files with 36 additions and 0 deletions
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36
drivers/usb/dwc3/dwc3-pci.c
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@ -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));
}