RDMA/nes: Add additional SFP+ PHY uC status check and PHY reset

Add additional PHY uC status check in case PHY firmware is not running
properly with heartbeat.  Add a hard PHY reset if uC status is 0x0
after initial reset.

Signed-off-by: Chien Tung <chien.tin.tung@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/nes/nes_hw.c b/drivers/infiniband/hw/nes/nes_hw.c
index 3d9bbff..b59ca56 100644 (file)
--- a/drivers/infiniband/hw/nes/nes_hw.c
+++ b/drivers/infiniband/hw/nes/nes_hw.c
@@ -1356,6 +1356,8 @@ int nes_init_phy(struct nes_device *nesdev)
        }
        if ((phy_type == NES_PHY_TYPE_ARGUS) ||
            (phy_type == NES_PHY_TYPE_SFP_D)) {
+               u32 first_time = 1;
+
                /* Check firmware heartbeat */
                nes_read_10G_phy_reg(nesdev, phy_index, 0x3, 0xd7ee);
                temp_phy_data = (u16)nes_read_indexed(nesdev, NES_IDX_MAC_MDIO_CONTROL);
@@ -1363,8 +1365,13 @@ int nes_init_phy(struct nes_device *nesdev)
                nes_read_10G_phy_reg(nesdev, phy_index, 0x3, 0xd7ee);
                temp_phy_data2 = (u16)nes_read_indexed(nesdev, NES_IDX_MAC_MDIO_CONTROL);
 
-               if (temp_phy_data != temp_phy_data2)
-                       return 0;
+               if (temp_phy_data != temp_phy_data2) {
+                       nes_read_10G_phy_reg(nesdev, phy_index, 0x3, 0xd7fd);
+                       temp_phy_data = (u16)nes_read_indexed(nesdev, NES_IDX_MAC_MDIO_CONTROL);
+                       if ((temp_phy_data & 0xff) > 0x20)
+                               return 0;
+                       printk(PFX "Reinitializing PHY\n");
+               }
 
                /* no heartbeat, configure the PHY */
                nes_write_10G_phy_reg(nesdev, phy_index, 0x1, 0x0000, 0x8000);
@@ -1400,7 +1407,7 @@ int nes_init_phy(struct nes_device *nesdev)
                temp_phy_data = (u16)nes_read_indexed(nesdev, NES_IDX_MAC_MDIO_CONTROL);
                do {
                        if (counter++ > 150) {
-                               nes_debug(NES_DBG_PHY, "No PHY heartbeat\n");
+                               printk(PFX "No PHY heartbeat\n");
                                break;
                        }
                        mdelay(1);
@@ -1414,11 +1421,20 @@ int nes_init_phy(struct nes_device *nesdev)
                        nes_read_10G_phy_reg(nesdev, phy_index, 0x3, 0xd7fd);
                        temp_phy_data = (u16)nes_read_indexed(nesdev, NES_IDX_MAC_MDIO_CONTROL);
                        if (counter++ > 300) {
-                               nes_debug(NES_DBG_PHY, "PHY did not track\n");
-                               break;
+                               if (((temp_phy_data & 0xff) == 0x0) && first_time) {
+                                       first_time = 0;
+                                       counter = 0;
+                                       /* reset AMCC PHY and try again */
+                                       nes_write_10G_phy_reg(nesdev, phy_index, 0x3, 0xe854, 0x00c0);
+                                       nes_write_10G_phy_reg(nesdev, phy_index, 0x3, 0xe854, 0x0040);
+                                       continue;
+                               } else {
+                                       printk(PFX "PHY did not track\n");
+                                       break;
+                               }
                        }
                        mdelay(10);
-               } while (((temp_phy_data & 0xff) != 0x50) && ((temp_phy_data & 0xff) != 0x70));
+               } while ((temp_phy_data & 0xff) < 0x30);
 
                /* setup signal integrity */
                nes_write_10G_phy_reg(nesdev, phy_index, 0x1, 0xd003, 0x0000);