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Message-Id: <20250912-pci-pwrctrl-perst-v3-2-3c0ac62b032c@oss.qualcomm.com>
Date: Fri, 12 Sep 2025 14:05:02 +0530
From: Manivannan Sadhasivam via B4 Relay <devnull+manivannan.sadhasivam.oss.qualcomm.com@...nel.org>
To: Manivannan Sadhasivam <mani@...nel.org>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Krzysztof Wilczyński <kwilczynski@...nel.org>,
Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
Bartosz Golaszewski <brgl@...ev.pl>, Saravana Kannan <saravanak@...gle.com>
Cc: linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
Brian Norris <briannorris@...omium.org>,
Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>,
Bjorn Helgaas <helgaas@...nel.org>
Subject: [PATCH v3 2/4] PCI: qcom: Move host bridge 'phy' and 'reset'
pointers to struct qcom_pcie_port
From: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
DT binding allows specifying 'phy' and 'reset' properties in both host
bridge and Root Port nodes, though specifying in the host bridge node is
marked as deprecated. Still, the pcie-qcom driver should support both
combinations for maintaining the DT backwards compatibility. For this
purpose, the driver is holding the relevant pointers of these properties in
two structs: struct qcom_pcie_port and struct qcom_pcie.
However, this causes confusion and increases the driver complexity. Hence,
move the pointers from struct qcom_pcie to struct qcom_pcie_port. As a
result, even if these properties are specified in the host bridge node,
the pointers will be stored in struct qcom_pcie_port as if the properties
are specified in a single Root Port node. This logic simplifies the driver
a lot.
Suggested-by: Bjorn Helgaas <helgaas@...nel.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
---
drivers/pci/controller/dwc/pcie-qcom.c | 87 ++++++++++++++--------------------
1 file changed, 36 insertions(+), 51 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 294babe1816e4d0c2b2343fe22d89af72afcd6cd..6170c86f465f43f980f5b2f88bd8799c3c152e68 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -279,8 +279,6 @@ struct qcom_pcie {
void __iomem *elbi; /* DT elbi */
void __iomem *mhi;
union qcom_pcie_resources res;
- struct phy *phy;
- struct gpio_desc *reset;
struct icc_path *icc_mem;
struct icc_path *icc_cpu;
const struct qcom_pcie_cfg *cfg;
@@ -297,11 +295,8 @@ static void qcom_perst_assert(struct qcom_pcie *pcie, bool assert)
struct qcom_pcie_port *port;
int val = assert ? 1 : 0;
- if (list_empty(&pcie->ports))
- gpiod_set_value_cansleep(pcie->reset, val);
- else
- list_for_each_entry(port, &pcie->ports, list)
- gpiod_set_value_cansleep(port->reset, val);
+ list_for_each_entry(port, &pcie->ports, list)
+ gpiod_set_value_cansleep(port->reset, val);
usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
}
@@ -1253,57 +1248,32 @@ static bool qcom_pcie_link_up(struct dw_pcie *pci)
return val & PCI_EXP_LNKSTA_DLLLA;
}
-static void qcom_pcie_phy_exit(struct qcom_pcie *pcie)
-{
- struct qcom_pcie_port *port;
-
- if (list_empty(&pcie->ports))
- phy_exit(pcie->phy);
- else
- list_for_each_entry(port, &pcie->ports, list)
- phy_exit(port->phy);
-}
-
static void qcom_pcie_phy_power_off(struct qcom_pcie *pcie)
{
struct qcom_pcie_port *port;
- if (list_empty(&pcie->ports)) {
- phy_power_off(pcie->phy);
- } else {
- list_for_each_entry(port, &pcie->ports, list)
- phy_power_off(port->phy);
- }
+ list_for_each_entry(port, &pcie->ports, list)
+ phy_power_off(port->phy);
}
static int qcom_pcie_phy_power_on(struct qcom_pcie *pcie)
{
struct qcom_pcie_port *port;
- int ret = 0;
+ int ret;
- if (list_empty(&pcie->ports)) {
- ret = phy_set_mode_ext(pcie->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_RC);
+ list_for_each_entry(port, &pcie->ports, list) {
+ ret = phy_set_mode_ext(port->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_RC);
if (ret)
return ret;
- ret = phy_power_on(pcie->phy);
- if (ret)
+ ret = phy_power_on(port->phy);
+ if (ret) {
+ qcom_pcie_phy_power_off(pcie);
return ret;
- } else {
- list_for_each_entry(port, &pcie->ports, list) {
- ret = phy_set_mode_ext(port->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_RC);
- if (ret)
- return ret;
-
- ret = phy_power_on(port->phy);
- if (ret) {
- qcom_pcie_phy_power_off(pcie);
- return ret;
- }
}
}
- return ret;
+ return 0;
}
static int qcom_pcie_host_init(struct dw_pcie_rp *pp)
@@ -1748,8 +1718,10 @@ static int qcom_pcie_parse_ports(struct qcom_pcie *pcie)
return ret;
err_port_del:
- list_for_each_entry_safe(port, tmp, &pcie->ports, list)
+ list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+ phy_exit(port->phy);
list_del(&port->list);
+ }
return ret;
}
@@ -1757,20 +1729,32 @@ static int qcom_pcie_parse_ports(struct qcom_pcie *pcie)
static int qcom_pcie_parse_legacy_binding(struct qcom_pcie *pcie)
{
struct device *dev = pcie->pci->dev;
+ struct qcom_pcie_port *port;
+ struct gpio_desc *reset;
+ struct phy *phy;
int ret;
- pcie->phy = devm_phy_optional_get(dev, "pciephy");
- if (IS_ERR(pcie->phy))
- return PTR_ERR(pcie->phy);
+ phy = devm_phy_optional_get(dev, "pciephy");
+ if (IS_ERR(phy))
+ return PTR_ERR(phy);
- pcie->reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_HIGH);
- if (IS_ERR(pcie->reset))
- return PTR_ERR(pcie->reset);
+ reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_HIGH);
+ if (IS_ERR(reset))
+ return PTR_ERR(reset);
- ret = phy_init(pcie->phy);
+ ret = phy_init(phy);
if (ret)
return ret;
+ port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
+ if (!port)
+ return -ENOMEM;
+
+ port->reset = reset;
+ port->phy = phy;
+ INIT_LIST_HEAD(&port->list);
+ list_add_tail(&port->list, &pcie->ports);
+
return 0;
}
@@ -1984,9 +1968,10 @@ static int qcom_pcie_probe(struct platform_device *pdev)
err_host_deinit:
dw_pcie_host_deinit(pp);
err_phy_exit:
- qcom_pcie_phy_exit(pcie);
- list_for_each_entry_safe(port, tmp, &pcie->ports, list)
+ list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+ phy_exit(port->phy);
list_del(&port->list);
+ }
err_pm_runtime_put:
pm_runtime_put(dev);
pm_runtime_disable(dev);
--
2.45.2
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