[PATCH v5 net-next 3/6] Revert "net: ethernet: ti: am65-cpsw: Add suspend/resume support"

Roger Quadros
2022-12-06T09:45:20Z

This reverts commit fd23df72f2be317d38d9fde0a8996b8e7454fd2a.

This commit broke set channel operation. Revert this and
implement it with a different approach in a separate patch.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
drivers/net/ethernet/ti/am65-cpsw-nuss.c | 221 ++++++-----------------
1 file changed, 55 insertions(+), 166 deletions(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 04e673902d53..4836960b0dd8 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -24,7 +24,6 @@
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
-#include <linux/rtnetlink.h>
#include <linux/mfd/syscon.h>
#include <linux/sys_soc.h>
#include <linux/dma/ti-cppi5.h>
@@ -133,11 +132,6 @@
NETIF_MSG_IFUP | NETIF_MSG_PROBE | NETIF_MSG_IFDOWN | \
NETIF_MSG_RX_ERR | NETIF_MSG_TX_ERR)

-static int am65_cpsw_nuss_init_tx_chns(struct am65_cpsw_common *common);
-static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common);
-static void am65_cpsw_nuss_free_tx_chns(struct am65_cpsw_common *common);
-static void am65_cpsw_nuss_free_rx_chns(struct am65_cpsw_common *common);
-
static void am65_cpsw_port_set_sl_mac(struct am65_cpsw_port *slave,
const u8 *dev_addr)
{
@@ -379,20 +373,6 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
if (common->usage_count)
return 0;

- /* init tx/rx channels */
- ret = am65_cpsw_nuss_init_tx_chns(common);
- if (ret) {
- dev_err(common->dev, "init_tx_chns failed\n");
- return ret;
- }
-
- ret = am65_cpsw_nuss_init_rx_chns(common);
- if (ret) {
- dev_err(common->dev, "init_rx_chns failed\n");
- am65_cpsw_nuss_free_tx_chns(common);
- return ret;
- }
-
/* Control register */
writel(AM65_CPSW_CTL_P0_ENABLE | AM65_CPSW_CTL_P0_TX_CRC_REMOVE |
AM65_CPSW_CTL_VLAN_AWARE | AM65_CPSW_CTL_P0_RX_PAD,
@@ -421,7 +401,6 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
/* disable priority elevation */
writel(0, common->cpsw_base + AM65_CPSW_REG_PTYPE);

- cpsw_ale_control_set(common->ale, 0, ALE_CLEAR, 1);
cpsw_ale_start(common->ale);

/* limit to one RX flow only */
@@ -453,8 +432,7 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
GFP_KERNEL);
if (!skb) {
dev_err(common->dev, "cannot allocate skb\n");
- ret = -ENOMEM;
- goto err;
+ return -ENOMEM;
}

ret = am65_cpsw_nuss_rx_push(common, skb);
@@ -463,7 +441,7 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
"cannot submit skb to channel rx, error %d\n",
ret);
kfree_skb(skb);
- goto err;
+ return ret;
}
kmemleak_not_leak(skb);
}
@@ -472,7 +450,7 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
for (i = 0; i < common->tx_ch_num; i++) {
ret = k3_udma_glue_enable_tx_chn(common->tx_chns[i].tx_chn);
if (ret)
- goto err;
+ return ret;
napi_enable(&common->tx_chns[i].napi_tx);
}

@@ -484,12 +462,6 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)

dev_dbg(common->dev, "cpsw_nuss started\n");
return 0;
-
-err:
- am65_cpsw_nuss_free_tx_chns(common);
- am65_cpsw_nuss_free_rx_chns(common);
-
- return ret;
}

static void am65_cpsw_nuss_tx_cleanup(void *data, dma_addr_t desc_dma);
@@ -543,9 +515,6 @@ static int am65_cpsw_nuss_common_stop(struct am65_cpsw_common *common)
writel(0, common->cpsw_base + AM65_CPSW_REG_CTL);
writel(0, common->cpsw_base + AM65_CPSW_REG_STAT_PORT_EN);

- am65_cpsw_nuss_free_tx_chns(common);
- am65_cpsw_nuss_free_rx_chns(common);
-
dev_dbg(common->dev, "cpsw_nuss stopped\n");
return 0;
}
@@ -586,29 +555,11 @@ static int am65_cpsw_nuss_ndo_slave_open(struct net_device *ndev)
struct am65_cpsw_common *common = am65_ndev_to_common(ndev);
struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
int ret, i;
- u32 reg;
- int tmo;

ret = pm_runtime_resume_and_get(common->dev);
if (ret < 0)
return ret;

- /* Idle MAC port */
- cpsw_sl_ctl_set(port->slave.mac_sl, CPSW_SL_CTL_CMD_IDLE);
-
- tmo = cpsw_sl_wait_for_idle(port->slave.mac_sl, 100);
- dev_info(common->dev, "down msc_sl %08x tmo %d\n",
- cpsw_sl_reg_read(port->slave.mac_sl, CPSW_SL_MACSTATUS), tmo);
-
- cpsw_sl_ctl_reset(port->slave.mac_sl);
-
- /* soft reset MAC */
- cpsw_sl_reg_write(port->slave.mac_sl, CPSW_SL_SOFT_RESET, 1);
- mdelay(1);
- reg = cpsw_sl_reg_read(port->slave.mac_sl, CPSW_SL_SOFT_RESET);
- if (reg)
- dev_info(common->dev, "mac reset not yet done\n");
-
/* Notify the stack of the actual queue counts. */
ret = netif_set_real_num_tx_queues(ndev, common->tx_ch_num);
if (ret) {
@@ -1539,9 +1490,9 @@ static void am65_cpsw_nuss_slave_disable_unused(struct am65_cpsw_port *port)
cpsw_sl_ctl_reset(port->slave.mac_sl);
}

-static void am65_cpsw_nuss_free_tx_chns(struct am65_cpsw_common *common)
+static void am65_cpsw_nuss_free_tx_chns(void *data)
{
- struct device *dev = common->dev;
+ struct am65_cpsw_common *common = data;
int i;

for (i = 0; i < common->tx_ch_num; i++) {
@@ -1553,11 +1504,7 @@ static void am65_cpsw_nuss_free_tx_chns(struct am65_cpsw_common *common)
if (!IS_ERR_OR_NULL(tx_chn->tx_chn))
k3_udma_glue_release_tx_chn(tx_chn->tx_chn);

- /* Don't clear tx_chn memory as we need to preserve
- * data between suspend/resume
- */
- if (!(tx_chn->irq < 0))
- devm_free_irq(dev, tx_chn->irq, tx_chn);
+ memset(tx_chn, 0, sizeof(*tx_chn));
}
}

@@ -1566,10 +1513,12 @@ void am65_cpsw_nuss_remove_tx_chns(struct am65_cpsw_common *common)
struct device *dev = common->dev;
int i;

+ devm_remove_action(dev, am65_cpsw_nuss_free_tx_chns, common);
+
for (i = 0; i < common->tx_ch_num; i++) {
struct am65_cpsw_tx_chn *tx_chn = &common->tx_chns[i];

- if (!(tx_chn->irq < 0))
+ if (tx_chn->irq)
devm_free_irq(dev, tx_chn->irq, tx_chn);

netif_napi_del(&tx_chn->napi_tx);
@@ -1639,7 +1588,7 @@ static int am65_cpsw_nuss_init_tx_chns(struct am65_cpsw_common *common)
}

tx_chn->irq = k3_udma_glue_tx_get_irq(tx_chn->tx_chn);
- if (tx_chn->irq < 0) {
+ if (tx_chn->irq <= 0) {
dev_err(dev, "Failed to get tx dma irq %d\n",
tx_chn->irq);
goto err;
@@ -1648,36 +1597,25 @@ static int am65_cpsw_nuss_init_tx_chns(struct am65_cpsw_common *common)
snprintf(tx_chn->tx_chn_name,
sizeof(tx_chn->tx_chn_name), "%s-tx%d",
dev_name(dev), tx_chn->id);
-
- ret = devm_request_irq(dev, tx_chn->irq,
- am65_cpsw_nuss_tx_irq,
- IRQF_TRIGGER_HIGH,
- tx_chn->tx_chn_name, tx_chn);
- if (ret) {
- dev_err(dev, "failure requesting tx%u irq %u, %d\n",
- tx_chn->id, tx_chn->irq, ret);
- tx_chn->irq = -EINVAL;
- goto err;
- }
}

- return 0;
-
err:
- am65_cpsw_nuss_free_tx_chns(common);
+ i = devm_add_action(dev, am65_cpsw_nuss_free_tx_chns, common);
+ if (i) {
+ dev_err(dev, "Failed to add free_tx_chns action %d\n", i);
+ return i;
+ }

return ret;
}

-static void am65_cpsw_nuss_free_rx_chns(struct am65_cpsw_common *common)
+static void am65_cpsw_nuss_free_rx_chns(void *data)
{
+ struct am65_cpsw_common *common = data;
struct am65_cpsw_rx_chn *rx_chn;

rx_chn = &common->rx_chns;

- if (!(rx_chn->irq < 0))
- devm_free_irq(common->dev, rx_chn->irq, common);
-
if (!IS_ERR_OR_NULL(rx_chn->desc_pool))
k3_cppi_desc_pool_destroy(rx_chn->desc_pool);

@@ -1700,7 +1638,7 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)

rx_cfg.swdata_size = AM65_CPSW_NAV_SW_DATA_SIZE;
rx_cfg.flow_id_num = AM65_CPSW_MAX_RX_FLOWS;
- rx_cfg.flow_id_base = -1;
+ rx_cfg.flow_id_base = common->rx_flow_id_base;

/* init all flows */
rx_chn->dev = dev;
@@ -1772,20 +1710,12 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
}
}

- ret = devm_request_irq(dev, rx_chn->irq,
- am65_cpsw_nuss_rx_irq,
- IRQF_TRIGGER_HIGH, dev_name(dev), common);
- if (ret) {
- dev_err(dev, "failure requesting rx irq %u, %d\n",
- rx_chn->irq, ret);
- rx_chn->irq = -EINVAL;
- goto err;
- }
-
- return 0;
-
err:
- am65_cpsw_nuss_free_rx_chns(common);
+ i = devm_add_action(dev, am65_cpsw_nuss_free_rx_chns, common);
+ if (i) {
+ dev_err(dev, "Failed to add free_rx_chns action %d\n", i);
+ return i;
+ }

return ret;
}
@@ -2051,7 +1981,6 @@ am65_cpsw_nuss_init_port_ndev(struct am65_cpsw_common *common, u32 port_idx)
port->slave.phylink_config.dev = &port->ndev->dev;
port->slave.phylink_config.type = PHYLINK_NETDEV;
port->slave.phylink_config.mac_capabilities = MAC_SYM_PAUSE | MAC_10 | MAC_100 | MAC_1000FD;
- port->slave.phylink_config.mac_managed_pm = true; /* MAC does PM */

if (phy_interface_mode_is_rgmii(port->slave.phy_if)) {
phy_interface_set_rgmii(port->slave.phylink_config.supported_interfaces);
@@ -2113,16 +2042,28 @@ static int am65_cpsw_nuss_init_ndevs(struct am65_cpsw_common *common)

static int am65_cpsw_nuss_ndev_add_tx_napi(struct am65_cpsw_common *common)
{
- int i;
+ struct device *dev = common->dev;
+ int i, ret = 0;

for (i = 0; i < common->tx_ch_num; i++) {
struct am65_cpsw_tx_chn *tx_chn = &common->tx_chns[i];

netif_napi_add_tx(common->dma_ndev, &tx_chn->napi_tx,
am65_cpsw_nuss_tx_poll);
+
+ ret = devm_request_irq(dev, tx_chn->irq,
+ am65_cpsw_nuss_tx_irq,
+ IRQF_TRIGGER_HIGH,
+ tx_chn->tx_chn_name, tx_chn);
+ if (ret) {
+ dev_err(dev, "failure requesting tx%u irq %u, %d\n",
+ tx_chn->id, tx_chn->irq, ret);
+ goto err;
+ }
}

- return 0;
+err:
+ return ret;
}

static void am65_cpsw_nuss_cleanup_ndev(struct am65_cpsw_common *common)
@@ -2591,6 +2532,15 @@ static int am65_cpsw_nuss_register_ndevs(struct am65_cpsw_common *common)
if (ret)
return ret;

+ ret = devm_request_irq(dev, common->rx_chns.irq,
+ am65_cpsw_nuss_rx_irq,
+ IRQF_TRIGGER_HIGH, dev_name(dev), common);
+ if (ret) {
+ dev_err(dev, "failure requesting rx irq %u, %d\n",
+ common->rx_chns.irq, ret);
+ return ret;
+ }
+
ret = am65_cpsw_nuss_register_devlink(common);
if (ret)
return ret;
@@ -2744,6 +2694,7 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)
if (common->port_num < 1 || common->port_num > AM65_CPSW_MAX_PORTS)
return -ENOENT;

+ common->rx_flow_id_base = -1;
init_completion(&common->tdown_complete);
common->tx_ch_num = 1;
common->pf_p0_rx_ptype_rrobin = false;
@@ -2785,6 +2736,14 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)

am65_cpsw_nuss_get_ver(common);

+ /* init tx channels */
+ ret = am65_cpsw_nuss_init_tx_chns(common);
+ if (ret)
+ goto err_of_clear;
+ ret = am65_cpsw_nuss_init_rx_chns(common);
+ if (ret)
+ goto err_of_clear;
+
ret = am65_cpsw_nuss_init_host_p(common);
if (ret)
goto err_of_clear;
@@ -2869,80 +2828,10 @@ static int am65_cpsw_nuss_remove(struct platform_device *pdev)
return 0;
}

-#ifdef CONFIG_PM_SLEEP
-static int am65_cpsw_nuss_suspend(struct device *dev)
-{
- struct am65_cpsw_common *common = dev_get_drvdata(dev);
- struct am65_cpsw_port *port;
- struct net_device *ndev;
- int i, ret;
-
- for (i = 0; i < common->port_num; i++) {
- port = &common->ports[i];
- ndev = port->ndev;
-
- if (!ndev)
- continue;
-
- netif_device_detach(ndev);
- if (netif_running(ndev)) {
- rtnl_lock();
- ret = am65_cpsw_nuss_ndo_slave_stop(ndev);
- rtnl_unlock();
- if (ret < 0) {
- netdev_err(ndev, "failed to stop: %d", ret);
- return ret;
- }
- }
- }
-
- am65_cpts_suspend(common->cpts);
-
- return 0;
-}
-
-static int am65_cpsw_nuss_resume(struct device *dev)
-{
- struct am65_cpsw_common *common = dev_get_drvdata(dev);
- struct am65_cpsw_port *port;
- struct net_device *ndev;
- int i, ret;
-
- am65_cpts_resume(common->cpts);
-
- for (i = 0; i < common->port_num; i++) {
- port = &common->ports[i];
- ndev = port->ndev;
-
- if (!ndev)
- continue;
-
- if (netif_running(ndev)) {
- rtnl_lock();
- ret = am65_cpsw_nuss_ndo_slave_open(ndev);
- rtnl_unlock();
- if (ret < 0) {
- netdev_err(ndev, "failed to start: %d", ret);
- return ret;
- }
- }
-
- netif_device_attach(ndev);
- }
-
- return 0;
-}
-#endif /* CONFIG_PM_SLEEP */
-
-static const struct dev_pm_ops am65_cpsw_nuss_dev_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(am65_cpsw_nuss_suspend, am65_cpsw_nuss_resume)
-};
-
static struct platform_driver am65_cpsw_nuss_driver = {
.driver = {
.name = AM65_CPSW_DRV_NAME,
.of_match_table = am65_cpsw_nuss_of_mtable,
- .pm = &am65_cpsw_nuss_dev_pm_ops,
},
.probe = am65_cpsw_nuss_probe,
.remove = am65_cpsw_nuss_remove,
--
2.17.1