[PATCH v3 net-next 6/6] net: ethernet: ti: am65-cpsw: Fix hardware switch mode on suspend/resume

Roger Quadros
2022-11-23T13:05:33Z

On low power during system suspend the ALE table context is lost.
Save the ALE context before suspend and restore it after resume.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ethernet/ti/am65-cpsw-nuss.c | 7 +++++++
drivers/net/ethernet/ti/am65-cpsw-nuss.h | 2 ++
2 files changed, 9 insertions(+)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index f5357afde527..72e4ee71f106 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -2712,6 +2712,7 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)
struct clk *clk;
u64 id_temp;
int ret, i;
+ int ale_entries;

common = devm_kzalloc(dev, sizeof(struct am65_cpsw_common), GFP_KERNEL);
if (!common)
@@ -2807,6 +2808,10 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)
goto err_of_clear;
}

+ ale_entries = common->ale->params.ale_entries;
+ common->ale_context = devm_kzalloc(dev,
+ ale_entries * ALE_ENTRY_WORDS * sizeof(u32),
+ GFP_KERNEL);
ret = am65_cpsw_init_cpts(common);
if (ret)
goto err_of_clear;
@@ -2877,6 +2882,7 @@ static int am65_cpsw_nuss_suspend(struct device *dev)
int i, ret;
struct am65_cpsw_host *host_p = am65_common_get_host(common);

+ cpsw_ale_dump(common->ale, common->ale_context);
host_p->vid_context = readl(host_p->port_base + AM65_CPSW_PORT_VLAN_REG_OFFSET);
for (i = 0; i < common->port_num; i++) {
port = &common->ports[i];
@@ -2949,6 +2955,7 @@ static int am65_cpsw_nuss_resume(struct device *dev)
}

writel(host_p->vid_context, host_p->port_base + AM65_CPSW_PORT_VLAN_REG_OFFSET);
+ cpsw_ale_restore(common->ale, common->ale_context);

return 0;
}
diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.h b/drivers/net/ethernet/ti/am65-cpsw-nuss.h
index e95cc37a7286..4b75620f8d28 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.h
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.h
@@ -149,6 +149,8 @@ struct am65_cpsw_common {
struct net_device *hw_bridge_dev;
struct notifier_block am65_cpsw_netdevice_nb;
unsigned char switch_id[MAX_PHYS_ITEM_ID_LEN];
+ /* only for suspend/resume context restore */
+ u32 *ale_context;
};

struct am65_cpsw_ndev_stats {
--
2.17.1