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msm: ep_pcie: allow wake assertion during D3hot

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PCIe client may need to wake up the host when PCIe link is still
on. Add the support to assert wake to host side when PCIe is in
D3hot.

Change-Id: I15ffd5f03183054c7ef5d143757b923f32de0adc
Signed-off-by: Yan He <yanhe@codeaurora.org>
This commit is contained in:
Yan He 2015-03-25 23:04:16 -07:00 • committed by David Keitel
parent 5dbc08812b
commit 4b39cc2da0
2 changed files with 11 additions and 4 deletions
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1
drivers/platform/msm/ep_pcie/ep_pcie_com.h
View file

@ -283,6 +283,7 @@ struct ep_pcie_dev_t {
bool perst_deast;
bool power_on;
bool suspending;
bool l23_ready;
bool l1ss_enabled;
struct ep_pcie_msi_config msi_cfg;

14
drivers/platform/msm/ep_pcie/ep_pcie_core.c
View file

@ -1075,6 +1075,7 @@ int ep_pcie_core_enable_endpoint(enum ep_pcie_options opt)
goto link_fail;
} else {
dev->link_status = EP_PCIE_LINK_UP;
dev->l23_ready = false;
EP_PCIE_DBG(dev,
"PCIe V%d: link is up after %d checkings (%d ms)\n",
dev->rev, retries,
@ -1250,6 +1251,7 @@ static irqreturn_t ep_pcie_handle_dstate_change_irq(int irq, void *data)
ep_pcie_reg_dump(dev, BIT(EP_PCIE_RES_DM_CORE), false);
if (dstate == 3) {
dev->l23_ready = true;
dev->d3_counter++;
EP_PCIE_DBG(dev,
"PCIe V%d: No. %ld change to D3 state.\n",
@ -1257,6 +1259,7 @@ static irqreturn_t ep_pcie_handle_dstate_change_irq(int irq, void *data)
ep_pcie_write_mask(dev->parf + PCIE20_PARF_PM_CTRL, 0, BIT(1));
ep_pcie_notify_event(dev, EP_PCIE_EVENT_PM_D3_HOT);
} else if (dstate == 0) {
dev->l23_ready = false;
dev->d0_counter++;
EP_PCIE_DBG(dev,
"PCIe V%d: No. %ld change to D0 state.\n",
@ -1647,14 +1650,17 @@ int ep_pcie_core_wakeup_host(void)
{
struct ep_pcie_dev_t *dev = &ep_pcie_dev;
if (dev->perst_deast) {
if (dev->perst_deast && !dev->l23_ready) {
EP_PCIE_ERR(dev,
"PCIe V%d: request to assert WAKE# when PERST is de-asserted.\n",
"PCIe V%d: request to assert WAKE# when PERST is de-asserted and D3hot is not received.\n",
dev->rev);
return EP_PCIE_ERROR;
} else {
EP_PCIE_DBG(dev, "PCIe V%d: No. %ld to assert PCIe WAKE#.\n",
dev->rev, ++dev->wake_counter);
EP_PCIE_DBG(dev,
"PCIe V%d: No. %ld to assert PCIe WAKE#; perst is %s de-asserted; D3hot is %s received.\n",
dev->rev, ++dev->wake_counter,
dev->perst_deast ? "" : "not",
dev->l23_ready ? "" : "not");
gpio_set_value(dev->gpio[EP_PCIE_GPIO_WAKE].num,
1 - dev->gpio[EP_PCIE_GPIO_WAKE].on);
gpio_set_value(dev->gpio[EP_PCIE_GPIO_WAKE].num,