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drivers: udc_dwc2: Change hibernation exit on bus reset

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Adhere to programming guide steps on Hibernation Exit on Host Initiated
Reset.

Signed-off-by: Tomasz Moń <tomasz.mon@nordicsemi.no>
This commit is contained in:
Tomasz Moń 2024-09-30 08:54:11 +02:00 committed by Fabio Baltieri
parent f57e78de2a
commit 508bd3edef
1 changed files with 13 additions and 6 deletions
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19
drivers/usb/udc/udc_dwc2.c
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@ -904,7 +904,7 @@ static void dwc2_backup_registers(const struct device *dev)
}
static void dwc2_restore_essential_registers(const struct device *dev,
bool rwup)
bool rwup, bool bus_reset)
{
const struct udc_dwc2_config *const config = dev->config;
struct usb_dwc2_reg *const base = config->base;
@ -925,6 +925,10 @@ static void dwc2_restore_essential_registers(const struct device *dev,
sys_write32(backup->gusbcfg, (mem_addr_t)&base->gusbcfg);
sys_write32(backup->dcfg, (mem_addr_t)&base->dcfg);
if (bus_reset) {
sys_write32(backup->dcfg, (mem_addr_t)&base->dcfg);
}
if (!rwup) {
pcgcctl |= USB_DWC2_PCGCCTL_RESTOREMODE | USB_DWC2_PCGCCTL_RSTPDWNMODULE;
}
@ -1026,7 +1030,8 @@ static void dwc2_enter_hibernation(const struct device *dev)
LOG_DBG("Hibernated");
}
static void dwc2_exit_hibernation(const struct device *dev, bool rwup)
static void dwc2_exit_hibernation(const struct device *dev,
bool rwup, bool bus_reset)
{
const struct udc_dwc2_config *const config = dev->config;
struct usb_dwc2_reg *const base = config->base;
@ -1066,13 +1071,15 @@ static void dwc2_exit_hibernation(const struct device *dev, bool rwup)
/* Disable PMU interrupt */
sys_clear_bits(gpwrdn_reg, USB_DWC2_GPWRDN_PMUINTSEL);
dwc2_restore_essential_registers(dev, rwup);
dwc2_restore_essential_registers(dev, rwup, bus_reset);
/* Note: in Remote Wakeup case 15 ms max signaling time starts now */
/* Wait for Restore Done Interrupt */
dwc2_wait_for_bit(dev, (mem_addr_t)&base->gintsts, USB_DWC2_GINTSTS_RSTRDONEINT);
sys_write32(0xFFFFFFFFUL, (mem_addr_t)&base->gintsts);
if (!bus_reset) {
sys_write32(0xFFFFFFFFUL, (mem_addr_t)&base->gintsts);
}
/* Disable restore from PMU */
sys_clear_bits(gpwrdn_reg, USB_DWC2_GPWRDN_RESTORE);
@ -2027,7 +2034,7 @@ static int udc_dwc2_disable(const struct device *dev)
config->irq_disable_func(dev);
if (priv->hibernated) {
dwc2_exit_hibernation(dev, false);
dwc2_exit_hibernation(dev, false, true);
priv->hibernated = 0;
}
@ -2744,7 +2751,7 @@ static void dwc2_handle_hibernation_exit(const struct device *dev,
struct usb_dwc2_reg *const base = dwc2_get_base(dev);
struct udc_dwc2_data *const priv = udc_get_private(dev);
dwc2_exit_hibernation(dev, rwup);
dwc2_exit_hibernation(dev, rwup, bus_reset);
dwc2_restore_device_registers(dev, rwup);
priv->hibernated = 0;