r8152: combine PHY reset with set_speed

PHY reset is necessary after some hw settings. However, it would
cause the linking down, and so does the set_speed function. Combine
the PHY reset with set_speed function. That could reduce the frequency
of linking down and accessing the PHY register.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Preetham Chandru R <pchandru@nvidia.com>
(cherry picked from commit aa66a5f1af163b6c90fca5a06c7fdab121b70cd2)
Change-Id: I51c55d1baa42df4a4474053291884813fae213c7
Reviewed-on: http://git-master/r/370020
Tested-by: Aly Hirani <ahirani@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Venkat Moganty <vmoganty@nvidia.com>

1 files changed, 45 insertions, 12 deletions

diff --git a/drivers/net/usb/r8152_shield.c b/drivers/net/usb/r8152_shield.c
index 4c5c81ea3..a22171f4f 100644
--- a/drivers/net/usb/r8152_shield.c
+++ b/drivers/net/usb/r8152_shield.c
@@ -437,6 +437,7 @@ enum rtl8152_flags {
         RTL8152_SET_RX_MODE,
         WORK_ENABLE,
         RTL8152_LINK_CHG,
+        PHY_RESET,
 };
 
 /* Define these values to match your device */
@@ -1794,6 +1795,29 @@ static void r8152_power_cut_en(struct r8152 *tp, bool enable)
 
 }
 
+static void rtl_phy_reset(struct r8152 *tp)
+{
+        u16 data;
+        int i;
+
+        clear_bit(PHY_RESET, &tp->flags);
+
+        data = r8152_mdio_read(tp, MII_BMCR);
+
+        /* don't reset again before the previous one complete */
+        if (data & BMCR_RESET)
+                return;
+
+        data |= BMCR_RESET;
+        r8152_mdio_write(tp, MII_BMCR, data);
+
+        for (i = 0; i < 50; i++) {
+                msleep(20);
+                if ((r8152_mdio_read(tp, MII_BMCR) & BMCR_RESET) == 0)
+                        break;
+        }
+}
+
 static void rtl_clear_bp(struct r8152 *tp)
 {
         ocp_write_dword(tp, MCU_TYPE_PLA, PLA_BP_0, 0);
@@ -1852,6 +1876,7 @@ static void r8152b_hw_phy_cfg(struct r8152 *tp)
         }
 
         r8152b_disable_aldps(tp);
+        set_bit(PHY_RESET, &tp->flags);
 }
 
 static void r8152b_exit_oob(struct r8152 *tp)
@@ -2040,6 +2065,8 @@ static void r8153_hw_phy_cfg(struct r8152 *tp)
         data = sram_read(tp, SRAM_10M_AMP2);
         data |= AMP_DN;
         sram_write(tp, SRAM_10M_AMP2, data);
+
+        set_bit(PHY_RESET, &tp->flags);
 }
 
 static void r8153_u1u2en(struct r8152 *tp, bool enable)
@@ -2293,12 +2320,26 @@ static int rtl8152_set_speed(struct r8152 *tp, u8 autoneg, u16 speed, u8 duplex)
                 bmcr = BMCR_ANENABLE | BMCR_ANRESTART;
         }
 
+        if (test_bit(PHY_RESET, &tp->flags))
+                bmcr |= BMCR_RESET;
+
         if (tp->mii.supports_gmii)
                 r8152_mdio_write(tp, MII_CTRL1000, gbcr);
 
         r8152_mdio_write(tp, MII_ADVERTISE, anar);
         r8152_mdio_write(tp, MII_BMCR, bmcr);
 
+        if (test_bit(PHY_RESET, &tp->flags)) {
+                int i;
+
+                clear_bit(PHY_RESET, &tp->flags);
+                for (i = 0; i < 50; i++) {
+                        msleep(20);
+                        if ((r8152_mdio_read(tp, MII_BMCR) & BMCR_RESET) == 0)
+                                break;
+                }
+        }
+
 out:
 
         return ret;
@@ -2362,6 +2403,10 @@ static void rtl_work_func_t(struct work_struct *work)
         if (test_bit(RTL8152_SET_RX_MODE, &tp->flags))
                 _rtl8152_set_rx_mode(tp->netdev);
 
+
+        if (test_bit(PHY_RESET, &tp->flags))
+                rtl_phy_reset(tp);
+
 out1:
         return;
 }
@@ -2457,7 +2502,6 @@ static void r8152b_enable_fc(struct r8152 *tp)
 static void r8152b_init(struct r8152 *tp)
 {
         u32 ocp_data;
-        int i;
 
         rtl_clear_bp(tp);
 
@@ -2489,14 +2533,6 @@ static void r8152b_init(struct r8152 *tp)
         r8152b_enable_aldps(tp);
         r8152b_enable_fc(tp);
 
-        r8152_mdio_write(tp, MII_BMCR, BMCR_RESET | BMCR_ANENABLE |
-                                       BMCR_ANRESTART);
-        for (i = 0; i < 100; i++) {
-                udelay(100);
-                if (!(r8152_mdio_read(tp, MII_BMCR) & BMCR_RESET))
-                        break;
-        }
-
         /* enable rx aggregation */
         ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_USB_CTRL);
         ocp_data &= ~RX_AGG_DISABLE;
@@ -2567,9 +2603,6 @@ static void r8153_init(struct r8152 *tp)
         r8153_enable_eee(tp);
         r8153_enable_aldps(tp);
         r8152b_enable_fc(tp);
-
-        r8152_mdio_write(tp, MII_BMCR, BMCR_RESET | BMCR_ANENABLE |
-                                       BMCR_ANRESTART);
 }
 
 static int rtl8152_suspend(struct usb_interface *intf, pm_message_t message)