[PATCH 4/6] net/txgbe: add BME reset for Amber-Lite 25G VF

[Zaiyu Wang <zaiyuwang@trustnetic.com>]

During VF reset, the PCIE BME (bus master enable) register needs to be
reconfigured to ensure proper NIC functionality.

Signed-off-by: Zaiyu Wang <zaiyuwang@trustnetic.com>
---
 drivers/net/txgbe/base/txgbe_regs.h | 2 ++
 drivers/net/txgbe/base/txgbe_vf.c   | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/net/txgbe/base/txgbe_regs.h b/drivers/net/txgbe/base/txgbe_regs.h
index cfe9b94e78..638404bdff 100644
--- a/drivers/net/txgbe/base/txgbe_regs.h
+++ b/drivers/net/txgbe/base/txgbe_regs.h
@@ -1273,6 +1273,8 @@ enum txgbe_5tuple_protocol {
 #define TXGBE_BMECTL                    0x012020
 #define TXGBE_BMEPEND                   0x000168
 
+#define TXGBE_BME_AML                   0x0004B8
+
 /* P2V Mailbox */
 #define TXGBE_MBMEM(i)           (0x005000 + 0x40 * (i)) /* 0-63 */
 #define TXGBE_MBCTL(i)           (0x000600 + 4 * (i)) /* 0-63 */
diff --git a/drivers/net/txgbe/base/txgbe_vf.c b/drivers/net/txgbe/base/txgbe_vf.c
index 5e41ba1a3e..efa32ca10a 100644
--- a/drivers/net/txgbe/base/txgbe_vf.c
+++ b/drivers/net/txgbe/base/txgbe_vf.c
@@ -133,6 +133,10 @@ s32 txgbe_reset_hw_vf(struct txgbe_hw *hw)
 		usec_delay(5);
 	}
 
+	/* amlite: bme */
+	if (hw->mac.type == txgbe_mac_aml_vf)
+		wr32(hw, TXGBE_BME_AML, 0x1);
+
 	if (!timeout)
 		return TXGBE_ERR_RESET_FAILED;
 
-- 
2.21.0.windows.1