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Message-ID: <20240901183221.240361-3-linux.amoon@gmail.com>
Date: Mon, 2 Sep 2024 00:02:09 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Shawn Lin <shawn.lin@...k-chips.com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
Rob Herring <robh@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Heiko Stuebner <heiko@...ech.de>,
Philipp Zabel <p.zabel@...gutronix.de>
Cc: Anand Moon <linux.amoon@...il.com>,
linux-pci@...r.kernel.org,
linux-rockchip@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v5 2/6] PCI: rockchip: Simplify reset control handling by using reset_control_bulk*() function
Refactor the reset control handling in the Rockchip PCIe driver,
introducing a more robust and efficient method for assert and
deassert reset controller using reset_control_bulk*() API. Using the
reset_control_bulk APIs, the reset handling for the core clocks reset
unit becomes much simpler.
Signed-off-by: Anand Moon <linux.amoon@...il.com>
---
v5: Fix the De-assert reset core as per the TRM
De-assert the PIPE_RESET_N/MGMT_STICKY_RESET_N/MGMT_RESET_N/RESET_N
simultaneously.
v4: use dev_err_probe in error path.
v3: Fix typo in commit message, dropped reported by.
v2: Fix compilation error reported by Intel test robot
fixed checkpatch warning
---
---
drivers/pci/controller/pcie-rockchip.c | 151 +++++--------------------
drivers/pci/controller/pcie-rockchip.h | 26 +++--
2 files changed, 49 insertions(+), 128 deletions(-)
diff --git a/drivers/pci/controller/pcie-rockchip.c b/drivers/pci/controller/pcie-rockchip.c
index 2777ef0cb599..87daa3288a01 100644
--- a/drivers/pci/controller/pcie-rockchip.c
+++ b/drivers/pci/controller/pcie-rockchip.c
@@ -30,7 +30,7 @@ int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
struct platform_device *pdev = to_platform_device(dev);
struct device_node *node = dev->of_node;
struct resource *regs;
- int err;
+ int err, i;
if (rockchip->is_rc) {
regs = platform_get_resource_byname(pdev,
@@ -69,55 +69,23 @@ int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
if (rockchip->link_gen < 0 || rockchip->link_gen > 2)
rockchip->link_gen = 2;
- rockchip->core_rst = devm_reset_control_get_exclusive(dev, "core");
- if (IS_ERR(rockchip->core_rst)) {
- if (PTR_ERR(rockchip->core_rst) != -EPROBE_DEFER)
- dev_err(dev, "missing core reset property in node\n");
- return PTR_ERR(rockchip->core_rst);
- }
-
- rockchip->mgmt_rst = devm_reset_control_get_exclusive(dev, "mgmt");
- if (IS_ERR(rockchip->mgmt_rst)) {
- if (PTR_ERR(rockchip->mgmt_rst) != -EPROBE_DEFER)
- dev_err(dev, "missing mgmt reset property in node\n");
- return PTR_ERR(rockchip->mgmt_rst);
- }
-
- rockchip->mgmt_sticky_rst = devm_reset_control_get_exclusive(dev,
- "mgmt-sticky");
- if (IS_ERR(rockchip->mgmt_sticky_rst)) {
- if (PTR_ERR(rockchip->mgmt_sticky_rst) != -EPROBE_DEFER)
- dev_err(dev, "missing mgmt-sticky reset property in node\n");
- return PTR_ERR(rockchip->mgmt_sticky_rst);
- }
-
- rockchip->pipe_rst = devm_reset_control_get_exclusive(dev, "pipe");
- if (IS_ERR(rockchip->pipe_rst)) {
- if (PTR_ERR(rockchip->pipe_rst) != -EPROBE_DEFER)
- dev_err(dev, "missing pipe reset property in node\n");
- return PTR_ERR(rockchip->pipe_rst);
- }
+ for (i = 0; i < ROCKCHIP_NUM_PM_RSTS; i++)
+ rockchip->pm_rsts[i].id = rockchip_pci_pm_rsts[i];
- rockchip->pm_rst = devm_reset_control_get_exclusive(dev, "pm");
- if (IS_ERR(rockchip->pm_rst)) {
- if (PTR_ERR(rockchip->pm_rst) != -EPROBE_DEFER)
- dev_err(dev, "missing pm reset property in node\n");
- return PTR_ERR(rockchip->pm_rst);
- }
+ err = devm_reset_control_bulk_get_optional_exclusive(dev,
+ ROCKCHIP_NUM_PM_RSTS,
+ rockchip->pm_rsts);
+ if (err)
+ return dev_err_probe(dev, err, "cannot get the reset control\n");
- rockchip->pclk_rst = devm_reset_control_get_exclusive(dev, "pclk");
- if (IS_ERR(rockchip->pclk_rst)) {
- if (PTR_ERR(rockchip->pclk_rst) != -EPROBE_DEFER)
- dev_err(dev, "missing pclk reset property in node\n");
- return PTR_ERR(rockchip->pclk_rst);
- }
+ for (i = 0; i < ROCKCHIP_NUM_CORE_RSTS; i++)
+ rockchip->core_rsts[i].id = rockchip_pci_core_rsts[i];
- rockchip->aclk_rst = devm_reset_control_get_exclusive(dev, "aclk");
- if (IS_ERR(rockchip->aclk_rst)) {
- if (PTR_ERR(rockchip->aclk_rst) != -EPROBE_DEFER)
- dev_err(dev, "missing aclk reset property in node\n");
- return PTR_ERR(rockchip->aclk_rst);
- }
+ err = devm_reset_control_bulk_get_optional_exclusive(dev,
+ ROCKCHIP_NUM_CORE_RSTS,
+ rockchip->core_rsts);
+ if (err)
+ return dev_err_probe(dev, err, "cannot get the reset control\n");
if (rockchip->is_rc) {
rockchip->ep_gpio = devm_gpiod_get_optional(dev, "ep",
@@ -147,23 +115,10 @@ int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
int err, i;
u32 regs;
- err = reset_control_assert(rockchip->aclk_rst);
- if (err) {
- dev_err(dev, "assert aclk_rst err %d\n", err);
- return err;
- }
-
- err = reset_control_assert(rockchip->pclk_rst);
- if (err) {
- dev_err(dev, "assert pclk_rst err %d\n", err);
- return err;
- }
-
- err = reset_control_assert(rockchip->pm_rst);
- if (err) {
- dev_err(dev, "assert pm_rst err %d\n", err);
- return err;
- }
+ err = reset_control_bulk_assert(ROCKCHIP_NUM_PM_RSTS,
+ rockchip->pm_rsts);
+ if (err)
+ return dev_err_probe(dev, err, "reset bulk assert pm reset\n");
for (i = 0; i < MAX_LANE_NUM; i++) {
err = phy_init(rockchip->phys[i]);
@@ -173,47 +128,17 @@ int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
}
}
- err = reset_control_assert(rockchip->core_rst);
- if (err) {
- dev_err(dev, "assert core_rst err %d\n", err);
- goto err_exit_phy;
- }
-
- err = reset_control_assert(rockchip->mgmt_rst);
- if (err) {
- dev_err(dev, "assert mgmt_rst err %d\n", err);
- goto err_exit_phy;
- }
-
- err = reset_control_assert(rockchip->mgmt_sticky_rst);
- if (err) {
- dev_err(dev, "assert mgmt_sticky_rst err %d\n", err);
- goto err_exit_phy;
- }
-
- err = reset_control_assert(rockchip->pipe_rst);
- if (err) {
- dev_err(dev, "assert pipe_rst err %d\n", err);
- goto err_exit_phy;
- }
+ err = reset_control_bulk_assert(ROCKCHIP_NUM_CORE_RSTS,
+ rockchip->core_rsts);
+ if (err)
+ return dev_err_probe(dev, err, "reset bulk assert core reset\n");
udelay(10);
- err = reset_control_deassert(rockchip->pm_rst);
- if (err) {
- dev_err(dev, "deassert pm_rst err %d\n", err);
- goto err_exit_phy;
- }
-
- err = reset_control_deassert(rockchip->aclk_rst);
+ err = reset_control_bulk_deassert(ROCKCHIP_NUM_PM_RSTS,
+ rockchip->pm_rsts);
if (err) {
- dev_err(dev, "deassert aclk_rst err %d\n", err);
- goto err_exit_phy;
- }
-
- err = reset_control_deassert(rockchip->pclk_rst);
- if (err) {
- dev_err(dev, "deassert pclk_rst err %d\n", err);
+ dev_err(dev, "reset bulk deassert pm err %d\n", err);
goto err_exit_phy;
}
@@ -256,31 +181,15 @@ int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
* Please don't reorder the deassert sequence of the following
* four reset pins.
*/
- err = reset_control_deassert(rockchip->mgmt_sticky_rst);
- if (err) {
- dev_err(dev, "deassert mgmt_sticky_rst err %d\n", err);
- goto err_power_off_phy;
- }
-
- err = reset_control_deassert(rockchip->core_rst);
+ err = reset_control_bulk_deassert(ROCKCHIP_NUM_CORE_RSTS,
+ rockchip->core_rsts);
if (err) {
- dev_err(dev, "deassert core_rst err %d\n", err);
- goto err_power_off_phy;
- }
-
- err = reset_control_deassert(rockchip->mgmt_rst);
- if (err) {
- dev_err(dev, "deassert mgmt_rst err %d\n", err);
- goto err_power_off_phy;
- }
-
- err = reset_control_deassert(rockchip->pipe_rst);
- if (err) {
- dev_err(dev, "deassert pipe_rst err %d\n", err);
+ dev_err(dev, "reset bulk deassert core err %d\n", err);
goto err_power_off_phy;
}
return 0;
+
err_power_off_phy:
while (i--)
phy_power_off(rockchip->phys[i]);
diff --git a/drivers/pci/controller/pcie-rockchip.h b/drivers/pci/controller/pcie-rockchip.h
index bebab80c9553..2761699f670b 100644
--- a/drivers/pci/controller/pcie-rockchip.h
+++ b/drivers/pci/controller/pcie-rockchip.h
@@ -15,6 +15,7 @@
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/pci-ecam.h>
+#include <linux/reset.h>
/*
* The upper 16 bits of PCIE_CLIENT_CONFIG are a write mask for the lower 16
@@ -288,18 +289,29 @@
(((c) << ((b) * 8 + 5)) & \
ROCKCHIP_PCIE_CORE_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b))
+#define ROCKCHIP_NUM_PM_RSTS ARRAY_SIZE(rockchip_pci_pm_rsts)
+#define ROCKCHIP_NUM_CORE_RSTS ARRAY_SIZE(rockchip_pci_core_rsts)
+
+static const char * const rockchip_pci_pm_rsts[] = {
+ "pm",
+ "pclk",
+ "aclk",
+};
+
+static const char * const rockchip_pci_core_rsts[] = {
+ "mgmt-sticky",
+ "mgmt",
+ "core",
+ "pipe",
+};
+
struct rockchip_pcie {
void __iomem *reg_base; /* DT axi-base */
void __iomem *apb_base; /* DT apb-base */
bool legacy_phy;
struct phy *phys[MAX_LANE_NUM];
- struct reset_control *core_rst;
- struct reset_control *mgmt_rst;
- struct reset_control *mgmt_sticky_rst;
- struct reset_control *pipe_rst;
- struct reset_control *pm_rst;
- struct reset_control *aclk_rst;
- struct reset_control *pclk_rst;
+ struct reset_control_bulk_data pm_rsts[ROCKCHIP_NUM_PM_RSTS];
+ struct reset_control_bulk_data core_rsts[ROCKCHIP_NUM_CORE_RSTS];
struct clk_bulk_data *clks;
int num_clks;
struct regulator *vpcie12v; /* 12V power supply */
--
2.44.0
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