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Merge "pci: msm: Add support to handle ep driver requested link down"

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This commit is contained in:
qctecmdr 2020-08-19 15:08:37 -07:00 • committed by Gerrit - the friendly Code Review server
commit 5e72daf3f2
2 changed files with 45 additions and 28 deletions
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72
drivers/pci/controller/pci-msm.c
View file

@ -4584,10 +4584,41 @@ static irqreturn_t handle_wake_irq(int irq, void *data)
return IRQ_HANDLED;
}
static void msm_pcie_handle_linkdown(struct msm_pcie_dev_t *dev)
{
int i;
if (dev->link_status == MSM_PCIE_LINK_DOWN)
return;
dev->link_status = MSM_PCIE_LINK_DOWN;
dev->shadow_en = false;
/* assert PERST */
if (!(msm_pcie_keep_resources_on & BIT(dev->rc_idx)))
gpio_set_value(dev->gpio[MSM_PCIE_GPIO_PERST].num,
dev->gpio[MSM_PCIE_GPIO_PERST].on);
PCIE_ERR(dev, "PCIe link is down for RC%d\n", dev->rc_idx);
if (dev->linkdown_panic)
panic("User has chosen to panic on linkdown\n");
if (dev->num_ep > 1) {
for (i = 0; i < MAX_DEVICE_NUM; i++) {
dev->event_reg =
dev->pcidev_table[i].event_reg;
msm_pcie_notify_client(dev,
MSM_PCIE_EVENT_LINKDOWN);
}
} else {
msm_pcie_notify_client(dev, MSM_PCIE_EVENT_LINKDOWN);
}
}
static irqreturn_t handle_linkdown_irq(int irq, void *data)
{
struct msm_pcie_dev_t *dev = data;
int i;
dev->linkdown_counter++;
@ -4595,39 +4626,16 @@ static irqreturn_t handle_linkdown_irq(int irq, void *data)
"PCIe: No. %ld linkdown IRQ for RC%d.\n",
dev->linkdown_counter, dev->rc_idx);
if (!dev->enumerated || dev->link_status != MSM_PCIE_LINK_ENABLED) {
if (!dev->enumerated || dev->link_status != MSM_PCIE_LINK_ENABLED)
PCIE_DBG(dev,
"PCIe:Linkdown IRQ for RC%d when the link is not enabled\n",
dev->rc_idx);
} else if (dev->suspending) {
else if (dev->suspending)
PCIE_DBG(dev,
"PCIe:the link of RC%d is suspending.\n",
dev->rc_idx);
} else {
dev->link_status = MSM_PCIE_LINK_DOWN;
dev->shadow_en = false;
if (dev->linkdown_panic)
panic("User has chosen to panic on linkdown\n");
/* assert PERST */
if (!(msm_pcie_keep_resources_on & BIT(dev->rc_idx)))
gpio_set_value(dev->gpio[MSM_PCIE_GPIO_PERST].num,
dev->gpio[MSM_PCIE_GPIO_PERST].on);
PCIE_ERR(dev, "PCIe link is down for RC%d\n", dev->rc_idx);
if (dev->num_ep > 1) {
for (i = 0; i < MAX_DEVICE_NUM; i++) {
dev->event_reg =
dev->pcidev_table[i].event_reg;
msm_pcie_notify_client(dev,
MSM_PCIE_EVENT_LINKDOWN);
}
} else {
msm_pcie_notify_client(dev, MSM_PCIE_EVENT_LINKDOWN);
}
}
else
msm_pcie_handle_linkdown(dev);
return IRQ_HANDLED;
}
@ -6827,6 +6835,7 @@ int msm_pcie_pm_control(enum msm_pcie_pm_opt pm_opt, u32 busnr, void *user,
int ret = 0;
struct pci_dev *dev;
u32 rc_idx = 0;
unsigned long flags;
struct msm_pcie_dev_t *pcie_dev;
if (!user) {
@ -6972,6 +6981,13 @@ int msm_pcie_pm_control(enum msm_pcie_pm_opt pm_opt, u32 busnr, void *user,
spin_unlock_irqrestore(&msm_pcie_dev[rc_idx].cfg_lock,
msm_pcie_dev[rc_idx].irqsave_flags);
break;
case MSM_PCIE_HANDLE_LINKDOWN:
PCIE_DBG(&msm_pcie_dev[rc_idx],
"User of RC%d requests handling link down.\n", rc_idx);
spin_lock_irqsave(&msm_pcie_dev[rc_idx].irq_lock, flags);
msm_pcie_handle_linkdown(pcie_dev);
spin_unlock_irqrestore(&msm_pcie_dev[rc_idx].irq_lock, flags);
break;
default:
PCIE_ERR(&msm_pcie_dev[rc_idx],
"PCIe: RC%d: unsupported pm operation:%d.\n",

1
include/linux/msm_pcie.h
View file

@ -21,6 +21,7 @@ enum msm_pcie_pm_opt {
MSM_PCIE_RESUME,
MSM_PCIE_DISABLE_PC,
MSM_PCIE_ENABLE_PC,
MSM_PCIE_HANDLE_LINKDOWN,
};
enum msm_pcie_event {