[PATCH v4 13/18] PCI: dwc: Add start_link/stop_link inliners

Serge Semin
2022-06-10T08:30:03Z

There are several places in the generic DW PCIe code where the
platform-specific PCIe link start/stop methods are called after making
sure the ops handler and the callbacks are specified. Instead of repeating
the same pattern over and over let's define the static-inline methods in
the DW PCIe header file and use them in the relevant parts of the driver.

Note returning a negative error from the EP link start procedure if the
start_link pointer isn't specified doesn't really make much sense since it
perfectly normal to have such platform. Moreover even pci_epc_start()
doesn't fail if no epc->ops->start callback is spotted. As a side-effect
of this modification we can set the generic DW PCIe and Layerscape EP
platform drivers free from the empty start_link callbacks and as such
entirely dummy dw_pcie_ops instances.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>

---

Changelog v4:
- This is a new patch created on the v4 lap of the series.
---
drivers/pci/controller/dwc/pci-layerscape-ep.c | 12 ------------
drivers/pci/controller/dwc/pcie-designware-ep.c | 8 ++------
drivers/pci/controller/dwc/pcie-designware-host.c | 10 ++++------
drivers/pci/controller/dwc/pcie-designware-plat.c | 10 ----------
drivers/pci/controller/dwc/pcie-designware.h | 14 ++++++++++++++
5 files changed, 20 insertions(+), 34 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c b/drivers/pci/controller/dwc/pci-layerscape-ep.c
index 39f4664bd84c..ad99707b3b99 100644
--- a/drivers/pci/controller/dwc/pci-layerscape-ep.c
+++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
@@ -32,15 +32,6 @@ struct ls_pcie_ep {
const struct ls_pcie_ep_drvdata *drvdata;
};

-static int ls_pcie_establish_link(struct dw_pcie *pci)
-{
- return 0;
-}
-
-static const struct dw_pcie_ops dw_ls_pcie_ep_ops = {
- .start_link = ls_pcie_establish_link,
-};
-
static const struct pci_epc_features*
ls_pcie_ep_get_features(struct dw_pcie_ep *ep)
{
@@ -106,19 +97,16 @@ static const struct dw_pcie_ep_ops ls_pcie_ep_ops = {

static const struct ls_pcie_ep_drvdata ls1_ep_drvdata = {
.ops = &ls_pcie_ep_ops,
- .dw_pcie_ops = &dw_ls_pcie_ep_ops,
};

static const struct ls_pcie_ep_drvdata ls2_ep_drvdata = {
.func_offset = 0x20000,
.ops = &ls_pcie_ep_ops,
- .dw_pcie_ops = &dw_ls_pcie_ep_ops,
};

static const struct ls_pcie_ep_drvdata lx2_ep_drvdata = {
.func_offset = 0x8000,
.ops = &ls_pcie_ep_ops,
- .dw_pcie_ops = &dw_ls_pcie_ep_ops,
};

static const struct of_device_id ls_pcie_ep_of_match[] = {
diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 7ad349c32082..15b8059544e3 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -435,8 +435,7 @@ static void dw_pcie_ep_stop(struct pci_epc *epc)
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

- if (pci->ops && pci->ops->stop_link)
- pci->ops->stop_link(pci);
+ dw_pcie_stop_link(pci);
}

static int dw_pcie_ep_start(struct pci_epc *epc)
@@ -444,10 +443,7 @@ static int dw_pcie_ep_start(struct pci_epc *epc)
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

- if (!pci->ops || !pci->ops->start_link)
- return -EINVAL;
-
- return pci->ops->start_link(pci);
+ return dw_pcie_start_link(pci);
}

static const struct pci_epc_features*
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index fa107e8dd2ab..f57f456aa543 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -408,8 +408,8 @@ int dw_pcie_host_init(struct pcie_port *pp)

dw_pcie_setup_rc(pp);

- if (!dw_pcie_link_up(pci) && pci->ops && pci->ops->start_link) {
- ret = pci->ops->start_link(pci);
+ if (!dw_pcie_link_up(pci)) {
+ ret = dw_pcie_start_link(pci);
if (ret)
goto err_free_msi;
}
@@ -426,8 +426,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
return 0;

err_stop_link:
- if (pci->ops && pci->ops->stop_link)
- pci->ops->stop_link(pci);
+ dw_pcie_stop_link(pci);

err_free_msi:
if (pp->has_msi_ctrl)
@@ -443,8 +442,7 @@ void dw_pcie_host_deinit(struct pcie_port *pp)
pci_stop_root_bus(pp->bridge->bus);
pci_remove_root_bus(pp->bridge->bus);

- if (pci->ops && pci->ops->stop_link)
- pci->ops->stop_link(pci);
+ dw_pcie_stop_link(pci);

if (pp->has_msi_ctrl)
dw_pcie_free_msi(pp);
diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index 0c5de87d3cc6..abf1afac6064 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -36,15 +36,6 @@ static const struct of_device_id dw_plat_pcie_of_match[];
static const struct dw_pcie_host_ops dw_plat_pcie_host_ops = {
};

-static int dw_plat_pcie_establish_link(struct dw_pcie *pci)
-{
- return 0;
-}
-
-static const struct dw_pcie_ops dw_pcie_ops = {
- .start_link = dw_plat_pcie_establish_link,
-};
-
static void dw_plat_pcie_ep_init(struct dw_pcie_ep *ep)
{
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
@@ -140,7 +131,6 @@ static int dw_plat_pcie_probe(struct platform_device *pdev)
return -ENOMEM;

pci->dev = dev;
- pci->ops = &dw_pcie_ops;

dw_plat_pcie->pci = pci;
dw_plat_pcie->mode = mode;
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 7d6e9b7576be..8ba239292634 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -365,6 +365,20 @@ static inline void dw_pcie_dbi_ro_wr_dis(struct dw_pcie *pci)
dw_pcie_writel_dbi(pci, reg, val);
}

+static inline int dw_pcie_start_link(struct dw_pcie *pci)
+{
+ if (pci->ops && pci->ops->start_link)
+ return pci->ops->start_link(pci);
+
+ return 0;
+}
+
+static inline void dw_pcie_stop_link(struct dw_pcie *pci)
+{
+ if (pci->ops && pci->ops->stop_link)
+ pci->ops->stop_link(pci);
+}
+
#ifdef CONFIG_PCIE_DW_HOST
irqreturn_t dw_handle_msi_irq(struct pcie_port *pp);
void dw_pcie_setup_rc(struct pcie_port *pp);
--
2.35.1