[PATCH dwc-next 1/3] PCI: dwc: Don't assume the ops in dw_pcie always exists

From: Jisheng Zhang
Date: Mon Oct 05 2020 - 05:16:34 EST


Some designware based device driver especially host only driver may
work well with the default read_dbi/write_dbi/link_up implementation
in pcie-designware.c, thus remove the assumption to simplify those
drivers.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@xxxxxxxxxxxxx>
---
drivers/pci/controller/dwc/pcie-designware-ep.c | 8 +++-----
drivers/pci/controller/dwc/pcie-designware.c | 14 +++++++-------
2 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index ad7da4ea43a5..411b7624331d 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -432,10 +432,8 @@ 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->stop_link)
- return;
-
- pci->ops->stop_link(pci);
+ if (pci->ops && pci->ops->stop_link)
+ pci->ops->stop_link(pci);
}

static int dw_pcie_ep_start(struct pci_epc *epc)
@@ -443,7 +441,7 @@ 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->start_link)
+ if (!pci->ops || !pci->ops->start_link)
return -EINVAL;

return pci->ops->start_link(pci);
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 3c1f17c78241..2a6109109029 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -140,7 +140,7 @@ u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size)
int ret;
u32 val;

- if (pci->ops->read_dbi)
+ if (pci->ops && pci->ops->read_dbi)
return pci->ops->read_dbi(pci, pci->dbi_base, reg, size);

ret = dw_pcie_read(pci->dbi_base + reg, size, &val);
@@ -155,7 +155,7 @@ void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
{
int ret;

- if (pci->ops->write_dbi) {
+ if (pci->ops && pci->ops->write_dbi) {
pci->ops->write_dbi(pci, pci->dbi_base, reg, size, val);
return;
}
@@ -170,7 +170,7 @@ void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
{
int ret;

- if (pci->ops->write_dbi2) {
+ if (pci->ops && pci->ops->write_dbi2) {
pci->ops->write_dbi2(pci, pci->dbi_base2, reg, size, val);
return;
}
@@ -185,7 +185,7 @@ static u32 dw_pcie_readl_atu(struct dw_pcie *pci, u32 reg)
int ret;
u32 val;

- if (pci->ops->read_dbi)
+ if (pci->ops && pci->ops->read_dbi)
return pci->ops->read_dbi(pci, pci->atu_base, reg, 4);

ret = dw_pcie_read(pci->atu_base + reg, 4, &val);
@@ -199,7 +199,7 @@ static void dw_pcie_writel_atu(struct dw_pcie *pci, u32 reg, u32 val)
{
int ret;

- if (pci->ops->write_dbi) {
+ if (pci->ops && pci->ops->write_dbi) {
pci->ops->write_dbi(pci, pci->atu_base, reg, 4, val);
return;
}
@@ -270,7 +270,7 @@ static void __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
{
u32 retries, val;

- if (pci->ops->cpu_addr_fixup)
+ if (pci->ops && pci->ops->cpu_addr_fixup)
cpu_addr = pci->ops->cpu_addr_fixup(pci, cpu_addr);

if (pci->iatu_unroll_enabled) {
@@ -478,7 +478,7 @@ int dw_pcie_link_up(struct dw_pcie *pci)
{
u32 val;

- if (pci->ops->link_up)
+ if (pci->ops && pci->ops->link_up)
return pci->ops->link_up(pci);

val = readl(pci->dbi_base + PCIE_PORT_DEBUG1);
--
2.28.0