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Merge branch 'pci/controller/aspm'

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- Add a dwc .host_post_init() callback for configuration after downstream
  devices are scanned (Manivannan Sadhasivam)

- Enable ASPM for devices below qcom 1.9.0 host controllers (Manivannan
  Sadhasivam)

* pci/controller/aspm:
  PCI: qcom: Enable ASPM for platforms supporting 1.9.0 ops
  PCI: dwc: Add host_post_init() callback
This commit is contained in:
Bjorn Helgaas 2023-10-28 13:31:00 -05:00
commit 86b812dc49
3 changed files with 32 additions and 0 deletions
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3
drivers/pci/controller/dwc/pcie-designware-host.c
View file

@ -502,6 +502,9 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
if (ret)
goto err_stop_link;
if (pp->ops->host_post_init)
pp->ops->host_post_init(pp);
return 0;
err_stop_link:

1
drivers/pci/controller/dwc/pcie-designware.h
View file

@ -301,6 +301,7 @@ enum dw_pcie_ltssm {
struct dw_pcie_host_ops {
int (*host_init)(struct dw_pcie_rp *pp);
void (*host_deinit)(struct dw_pcie_rp *pp);
void (*host_post_init)(struct dw_pcie_rp *pp);
int (*msi_host_init)(struct dw_pcie_rp *pp);
void (*pme_turn_off)(struct dw_pcie_rp *pp);
};

28
drivers/pci/controller/dwc/pcie-qcom.c
View file

@ -219,6 +219,7 @@ struct qcom_pcie_ops {
int (*get_resources)(struct qcom_pcie *pcie);
int (*init)(struct qcom_pcie *pcie);
int (*post_init)(struct qcom_pcie *pcie);
void (*host_post_init)(struct qcom_pcie *pcie);
void (*deinit)(struct qcom_pcie *pcie);
void (*ltssm_enable)(struct qcom_pcie *pcie);
int (*config_sid)(struct qcom_pcie *pcie);
@ -964,6 +965,22 @@ static int qcom_pcie_post_init_2_7_0(struct qcom_pcie *pcie)
return 0;
}
static int qcom_pcie_enable_aspm(struct pci_dev *pdev, void *userdata)
{
/* Downstream devices need to be in D0 state before enabling PCI PM substates */
pci_set_power_state(pdev, PCI_D0);
pci_enable_link_state(pdev, PCIE_LINK_STATE_ALL);
return 0;
}
static void qcom_pcie_host_post_init_2_7_0(struct qcom_pcie *pcie)
{
struct dw_pcie_rp *pp = &pcie->pci->pp;
pci_walk_bus(pp->bridge->bus, qcom_pcie_enable_aspm, NULL);
}
static void qcom_pcie_deinit_2_7_0(struct qcom_pcie *pcie)
{
struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
@ -1216,9 +1233,19 @@ static void qcom_pcie_host_deinit(struct dw_pcie_rp *pp)
pcie->cfg->ops->deinit(pcie);
}
static void qcom_pcie_host_post_init(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct qcom_pcie *pcie = to_qcom_pcie(pci);
if (pcie->cfg->ops->host_post_init)
pcie->cfg->ops->host_post_init(pcie);
}
static const struct dw_pcie_host_ops qcom_pcie_dw_ops = {
.host_init = qcom_pcie_host_init,
.host_deinit = qcom_pcie_host_deinit,
.host_post_init = qcom_pcie_host_post_init,
};
/* Qcom IP rev.: 2.1.0 Synopsys IP rev.: 4.01a */
@ -1280,6 +1307,7 @@ static const struct qcom_pcie_ops ops_1_9_0 = {
.get_resources = qcom_pcie_get_resources_2_7_0,
.init = qcom_pcie_init_2_7_0,
.post_init = qcom_pcie_post_init_2_7_0,
.host_post_init = qcom_pcie_host_post_init_2_7_0,
.deinit = qcom_pcie_deinit_2_7_0,
.ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
.config_sid = qcom_pcie_config_sid_1_9_0,