[RFC v2 PATCH 09/10] net: ti: prueth: Adds power management support for PRU-ICSS
From: Basharath Hussain Khaja <hidden>
Date: 2025-01-24 14:47:08
Also in:
linux-arm-kernel, linux-devicetree, linux-omap, lkml
Subsystem:
networking drivers, the rest, ti icssm ethernet driver (icssm) · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, MD Danish Anwar, Parvathi Pudi
From: Roger Quadros <redacted> Changes for supporting the sleep/resume feature for PRU-ICSS. PRU-ICSS will be kept in IDLE mode for optimal power consumption by Linux power management subsystem and will be resumed when it is required. Signed-off-by: Roger Quadros <redacted> Signed-off-by: Andrew F. Davis <redacted> Signed-off-by: Parvathi Pudi <parvathi@couthit.com> Signed-off-by: Basharath Hussain Khaja <redacted> --- drivers/net/ethernet/ti/icssm/icssm_prueth.c | 62 ++++++++++++++++++++ 1 file changed, 62 insertions(+)
diff --git a/drivers/net/ethernet/ti/icssm/icssm_prueth.c b/drivers/net/ethernet/ti/icssm/icssm_prueth.c
index fdc97ed9c1fb..a3c8c746ebf8 100644
--- a/drivers/net/ethernet/ti/icssm/icssm_prueth.c
+++ b/drivers/net/ethernet/ti/icssm/icssm_prueth.c@@ -2300,6 +2300,67 @@ static void icssm_prueth_remove(struct platform_device *pdev) pru_rproc_put(prueth->pru0); } +#ifdef CONFIG_PM_SLEEP +static int icssm_prueth_suspend(struct device *dev) +{ + struct prueth *prueth = dev_get_drvdata(dev); + struct net_device *ndev; + int i, ret; + + for (i = 0; i < PRUETH_NUM_MACS; i++) { + ndev = prueth->registered_netdevs[i]; + + if (!ndev) + continue; + + if (netif_running(ndev)) { + netif_device_detach(ndev); + ret = icssm_emac_ndo_stop(ndev); + if (ret < 0) { + netdev_err(ndev, "failed to stop: %d", ret); + return ret; + } + } + } + + pruss_cfg_ocp_master_ports(prueth->pruss, 0); + + return 0; +} + +static int icssm_prueth_resume(struct device *dev) +{ + struct prueth *prueth = dev_get_drvdata(dev); + struct net_device *ndev; + int i, ret; + + pruss_cfg_ocp_master_ports(prueth->pruss, 1); + + for (i = 0; i < PRUETH_NUM_MACS; i++) { + ndev = prueth->registered_netdevs[i]; + + if (!ndev) + continue; + + if (netif_running(ndev)) { + ret = icssm_emac_ndo_open(ndev); + 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 prueth_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(icssm_prueth_suspend, icssm_prueth_resume) +}; + /* AM57xx SoC-specific firmware data */ static struct prueth_private_data am57xx_prueth_pdata = { .fw_pru[PRUSS_PRU0] = {
@@ -2324,6 +2385,7 @@ static struct platform_driver prueth_driver = { .driver = { .name = "prueth", .of_match_table = prueth_dt_match, + .pm = &prueth_dev_pm_ops, }, }; module_platform_driver(prueth_driver);
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2.34.1