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Subject[PATCH net-next 2/2] net: stmmac: Add callbacks for DWC xpcs Energy Efficient Ethernet
Date
Link xpcs callback functions for MAC to configure the xpcs EEE feature.

The clk_eee frequency is used to calculate the MULT_FACT_100NS. This is
to adjust the clock tic closer to 100ns.

Signed-off-by: Michael Sit Wei Hong <michael.wei.hong.sit@intel.com>
---
drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c | 11 +++++++++++
drivers/net/ethernet/stmicro/stmmac/hwif.h | 2 ++
drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c | 6 ++++++
include/linux/stmmac.h | 1 +
4 files changed, 20 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
index 80728a4c0e3f..e36a8cc59ad0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
@@ -429,6 +429,17 @@ static int intel_mgbe_common_data(struct pci_dev *pdev,
plat->force_sf_dma_mode = 0;
plat->tso_en = 1;

+ /* Multiplying factor to the clk_eee_i clock time
+ * period to make it closer to 100 ns. This value
+ * should be programmed such that the clk_eee_time_period *
+ * (MULT_FACT_100NS + 1) should be within 80 ns to 120 ns
+ * clk_eee frequency is 19.2Mhz
+ * clk_eee_time_period is 52ns
+ * 52ns * (1 + 1) = 104ns
+ * MULT_FACT_100NS = 1
+ */
+ plat->mult_fact_100ns = 1;
+
plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP;

for (i = 0; i < plat->rx_queues_to_use; i++) {
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index 2cc91759b91f..c678d7b826a3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -624,6 +624,8 @@ struct stmmac_mmc_ops {
stmmac_do_callback(__priv, xpcs, link_up, __args)
#define stmmac_xpcs_probe(__priv, __args...) \
stmmac_do_callback(__priv, xpcs, probe, __args)
+#define stmmac_xpcs_config_eee(__priv, __args...) \
+ stmmac_do_callback(__priv, xpcs, config_eee, __args)

struct stmmac_regs_off {
u32 ptp_off;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index 61b11639ee0c..1f6d749fd9a3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -720,6 +720,12 @@ static int stmmac_ethtool_op_set_eee(struct net_device *dev,
netdev_warn(priv->dev,
"Setting EEE tx-lpi is not supported\n");

+ ret = stmmac_xpcs_config_eee(priv, &priv->hw->xpcs_args,
+ priv->plat->mult_fact_100ns,
+ edata->eee_enabled);
+ if (ret)
+ return ret;
+
if (!edata->eee_enabled)
stmmac_disable_eee_mode(priv);

diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 0db36360ef21..e14a12df381b 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -223,6 +223,7 @@ struct plat_stmmacenet_data {
struct clk *clk_ptp_ref;
unsigned int clk_ptp_rate;
unsigned int clk_ref_rate;
+ unsigned int mult_fact_100ns;
s32 ptp_max_adj;
struct reset_control *stmmac_rst;
struct stmmac_axi *axi;
--
2.17.1
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