net: stmmac: Enable EEE HW LPI timer with auto SW/HW switching

This patch enables the HW LPI Timer which controls the automatic entry
and exit of the LPI state.
The EEE LPI timer value is configured through ethtool. The driver will
auto select the LPI HW timer if the value in the HW timer supported range.
Else, the driver will fallback to SW timer.

Signed-off-by: Vineetha G. Jaya Kumaran <vineetha.g.jaya.kumaran@intel.com>
Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>
Link: https://lore.kernel.org/r/20201027160051.22898-1-weifeng.voon@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index df7de50..6f271c4 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -402,6 +402,7 @@ struct dma_features {
 /* Default LPI timers */
 #define STMMAC_DEFAULT_LIT_LS  0x3E8
 #define STMMAC_DEFAULT_TWT_LS  0x1E
+#define STMMAC_ET_MAX          0xFFFFF
 
 #define STMMAC_CHAIN_MODE      0x1
 #define STMMAC_RING_MODE       0x2

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
index 592b043..82df91c 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
@@ -176,9 +176,11 @@ enum power_event {
  */
 #define GMAC4_LPI_CTRL_STATUS  0xd0
 #define GMAC4_LPI_TIMER_CTRL   0xd4
+#define GMAC4_LPI_ENTRY_TIMER  0xd8
 
 /* LPI control and status defines */
 #define GMAC4_LPI_CTRL_STATUS_LPITCSE  BIT(21) /* LPI Tx Clock Stop Enable */
+#define GMAC4_LPI_CTRL_STATUS_LPIATE   BIT(20) /* LPI Timer Enable */
 #define GMAC4_LPI_CTRL_STATUS_LPITXA   BIT(19) /* Enable LPI TX Automate */
 #define GMAC4_LPI_CTRL_STATUS_PLS      BIT(17) /* PHY Link Status */
 #define GMAC4_LPI_CTRL_STATUS_LPIEN    BIT(16) /* LPI Enable */

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index 002791b..3ed4f4c 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -379,6 +379,27 @@ static void dwmac4_set_eee_pls(struct mac_device_info *hw, int link)
        writel(value, ioaddr + GMAC4_LPI_CTRL_STATUS);
 }
 
+static void dwmac4_set_eee_lpi_entry_timer(struct mac_device_info *hw, int et)
+{
+       void __iomem *ioaddr = hw->pcsr;
+       int value = et & STMMAC_ET_MAX;
+       int regval;
+
+       /* Program LPI entry timer value into register */
+       writel(value, ioaddr + GMAC4_LPI_ENTRY_TIMER);
+
+       /* Enable/disable LPI entry timer */
+       regval = readl(ioaddr + GMAC4_LPI_CTRL_STATUS);
+       regval |= GMAC4_LPI_CTRL_STATUS_LPIEN | GMAC4_LPI_CTRL_STATUS_LPITXA;
+
+       if (et)
+               regval |= GMAC4_LPI_CTRL_STATUS_LPIATE;
+       else
+               regval &= ~GMAC4_LPI_CTRL_STATUS_LPIATE;
+
+       writel(regval, ioaddr + GMAC4_LPI_CTRL_STATUS);
+}
+
 static void dwmac4_set_eee_timer(struct mac_device_info *hw, int ls, int tw)
 {
        void __iomem *ioaddr = hw->pcsr;
@@ -1164,6 +1185,7 @@ const struct stmmac_ops dwmac4_ops = {
        .get_umac_addr = dwmac4_get_umac_addr,
        .set_eee_mode = dwmac4_set_eee_mode,
        .reset_eee_mode = dwmac4_reset_eee_mode,
+       .set_eee_lpi_entry_timer = dwmac4_set_eee_lpi_entry_timer,
        .set_eee_timer = dwmac4_set_eee_timer,
        .set_eee_pls = dwmac4_set_eee_pls,
        .pcs_ctrl_ane = dwmac4_ctrl_ane,
@@ -1206,6 +1228,7 @@ const struct stmmac_ops dwmac410_ops = {
        .get_umac_addr = dwmac4_get_umac_addr,
        .set_eee_mode = dwmac4_set_eee_mode,
        .reset_eee_mode = dwmac4_reset_eee_mode,
+       .set_eee_lpi_entry_timer = dwmac4_set_eee_lpi_entry_timer,
        .set_eee_timer = dwmac4_set_eee_timer,
        .set_eee_pls = dwmac4_set_eee_pls,
        .pcs_ctrl_ane = dwmac4_ctrl_ane,
@@ -1249,6 +1272,7 @@ const struct stmmac_ops dwmac510_ops = {
        .get_umac_addr = dwmac4_get_umac_addr,
        .set_eee_mode = dwmac4_set_eee_mode,
        .reset_eee_mode = dwmac4_reset_eee_mode,
+       .set_eee_lpi_entry_timer = dwmac4_set_eee_lpi_entry_timer,
        .set_eee_timer = dwmac4_set_eee_timer,
        .set_eee_pls = dwmac4_set_eee_pls,
        .pcs_ctrl_ane = dwmac4_ctrl_ane,

diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index e2dca9b..b40b2e0 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -337,6 +337,7 @@ struct stmmac_ops {
        void (*set_eee_mode)(struct mac_device_info *hw,
                             bool en_tx_lpi_clockgating);
        void (*reset_eee_mode)(struct mac_device_info *hw);
+       void (*set_eee_lpi_entry_timer)(struct mac_device_info *hw, int et);
        void (*set_eee_timer)(struct mac_device_info *hw, int ls, int tw);
        void (*set_eee_pls)(struct mac_device_info *hw, int link);
        void (*debug)(void __iomem *ioaddr, struct stmmac_extra_stats *x,
@@ -439,6 +440,8 @@ struct stmmac_ops {
        stmmac_do_void_callback(__priv, mac, set_eee_mode, __args)
 #define stmmac_reset_eee_mode(__priv, __args...) \
        stmmac_do_void_callback(__priv, mac, reset_eee_mode, __args)
+#define stmmac_set_eee_lpi_timer(__priv, __args...) \
+       stmmac_do_void_callback(__priv, mac, set_eee_lpi_entry_timer, __args)
 #define stmmac_set_eee_timer(__priv, __args...) \
        stmmac_do_void_callback(__priv, mac, set_eee_timer, __args)
 #define stmmac_set_eee_pls(__priv, __args...) \

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 727e68d..c88ee8e 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -207,6 +207,7 @@ struct stmmac_priv {
        int tx_lpi_timer;
        int tx_lpi_enabled;
        int eee_tw_timer;
+       bool eee_sw_timer_en;
        unsigned int mode;
        unsigned int chain_mode;
        int extend_desc;

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 220626a..f2e3204 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -294,6 +294,16 @@ static inline u32 stmmac_rx_dirty(struct stmmac_priv *priv, u32 queue)
        return dirty;
 }
 
+static void stmmac_lpi_entry_timer_config(struct stmmac_priv *priv, bool en)
+{
+       int tx_lpi_timer;
+
+       /* Clear/set the SW EEE timer flag based on LPI ET enablement */
+       priv->eee_sw_timer_en = en ? 0 : 1;
+       tx_lpi_timer  = en ? priv->tx_lpi_timer : 0;
+       stmmac_set_eee_lpi_timer(priv, priv->hw, tx_lpi_timer);
+}
+
 /**
  * stmmac_enable_eee_mode - check and enter in LPI mode
  * @priv: driver private structure
@@ -327,6 +337,11 @@ static void stmmac_enable_eee_mode(struct stmmac_priv *priv)
  */
 void stmmac_disable_eee_mode(struct stmmac_priv *priv)
 {
+       if (!priv->eee_sw_timer_en) {
+               stmmac_lpi_entry_timer_config(priv, 0);
+               return;
+       }
+
        stmmac_reset_eee_mode(priv, priv->hw);
        del_timer_sync(&priv->eee_ctrl_timer);
        priv->tx_path_in_lpi_mode = false;
@@ -376,6 +391,7 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
        if (!priv->eee_active) {
                if (priv->eee_enabled) {
                        netdev_dbg(priv->dev, "disable EEE\n");
+                       stmmac_lpi_entry_timer_config(priv, 0);
                        del_timer_sync(&priv->eee_ctrl_timer);
                        stmmac_set_eee_timer(priv, priv->hw, 0, eee_tw_timer);
                }
@@ -389,7 +405,15 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
                                     eee_tw_timer);
        }
 
-       mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(priv->tx_lpi_timer));
+       if (priv->plat->has_gmac4 && priv->tx_lpi_timer <= STMMAC_ET_MAX) {
+               del_timer_sync(&priv->eee_ctrl_timer);
+               priv->tx_path_in_lpi_mode = false;
+               stmmac_lpi_entry_timer_config(priv, 1);
+       } else {
+               stmmac_lpi_entry_timer_config(priv, 0);
+               mod_timer(&priv->eee_ctrl_timer,
+                         STMMAC_LPI_T(priv->tx_lpi_timer));
+       }
 
        mutex_unlock(&priv->lock);
        netdev_dbg(priv->dev, "Energy-Efficient Ethernet initialized\n");
@@ -2044,7 +2068,8 @@ static int stmmac_tx_clean(struct stmmac_priv *priv, int budget, u32 queue)
                netif_tx_wake_queue(netdev_get_tx_queue(priv->dev, queue));
        }
 
-       if ((priv->eee_enabled) && (!priv->tx_path_in_lpi_mode)) {
+       if (priv->eee_enabled && !priv->tx_path_in_lpi_mode &&
+           priv->eee_sw_timer_en) {
                stmmac_enable_eee_mode(priv);
                mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(priv->tx_lpi_timer));
        }
@@ -3306,7 +3331,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
        tx_q = &priv->tx_queue[queue];
        first_tx = tx_q->cur_tx;
 
-       if (priv->tx_path_in_lpi_mode)
+       if (priv->tx_path_in_lpi_mode && priv->eee_sw_timer_en)
                stmmac_disable_eee_mode(priv);
 
        /* Manage oversized TCP frames for GMAC4 device */