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Commit 75b675a3 authored by Yan He's avatar Yan He
Browse files

msm: ep_pcie: allow wake assertion during D3hot 



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: default avatarYan He <yanhe@codeaurora.org>
parent 2635da9f

drivers/platform/msm/ep_pcie/ep_pcie_com.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

drivers/platform/msm/ep_pcie/ep_pcie_core.c

+10 −4
Original line number Diff line number Diff line
@@ -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,