From ac8f1e103d203d46b7a5e12bd6dc2f5c69008f83 Mon Sep 17 00:00:00 2001
From: Ronald Cron <ronald.cron@arm.com>
Date: Thu, 2 Apr 2015 13:49:05 +0000
Subject: EmbeddedPkg/Lan9118Dxe: Fix the reset after a receiver or transmitter
 error

The Lan9118 driver did not recover after a receiver error as the error
handling code stopped the transmitter but did not restart it. Added the
restart of the transmitter.

Added also the restart of the receiver after a transmitter error and
the reactivation of the LEDs after all resets.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Reviewed-by: Olivier Martin <olivier.martin@arm.com>




git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17106 6f19259b-4bc3-4df7-8a09-765794883524
---
 EmbeddedPkg/Drivers/Lan9118Dxe/Lan9118Dxe.c | 41 ++++++++++++++++++++++-------
 1 file changed, 31 insertions(+), 10 deletions(-)

diff --git a/EmbeddedPkg/Drivers/Lan9118Dxe/Lan9118Dxe.c b/EmbeddedPkg/Drivers/Lan9118Dxe/Lan9118Dxe.c
index 0503dbc..3b7882d 100644
--- a/EmbeddedPkg/Drivers/Lan9118Dxe/Lan9118Dxe.c
+++ b/EmbeddedPkg/Drivers/Lan9118Dxe/Lan9118Dxe.c
@@ -434,6 +434,12 @@ SnpReset (
   MmioWrite32 (LAN9118_PMT_CTRL, PmConf);
   gBS->Stall (LAN9118_STALL);
 
+  // Reactivate the LEDs
+  Status = ConfigureHardware (HW_CONF_USE_LEDS, Snp);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
   // Check that a buffer size was specified in SnpInitialize
   if (gTxBuffer != 0) {
     HwConf = MmioRead32 (LAN9118_HW_CFG);        // Read the HW register
@@ -1062,19 +1068,28 @@ SnpGetStatus (
   if (Interrupts & INSTS_TXE) {
     DEBUG ((EFI_D_ERROR, "LAN9118: Transmitter error. Restarting..."));
 
-    // Initiate a software reset
+    // Software reset, the TXE interrupt is cleared by the reset.
     Status = SoftReset (0, Snp);
     if (EFI_ERROR (Status)) {
       DEBUG ((EFI_D_ERROR, "\n\tSoft Reset Failed: Hardware Error\n"));
       return EFI_DEVICE_ERROR;
     }
 
-    // Acknowledge the TXE
-    MmioWrite32 (LAN9118_INT_STS, INSTS_TXE);
-    gBS->Stall (LAN9118_STALL);
+    // Reactivate the LEDs
+    Status = ConfigureHardware (HW_CONF_USE_LEDS, Snp);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
 
-    // Restart the transmitter
+    //
+    // Restart the transmitter and if necessary the receiver.
+    // Do not ask for FIFO reset as it has already been done
+    // by SoftReset().
+    //
     StartTx (START_TX_MAC | START_TX_CFG, Snp);
+    if (Snp->Mode->ReceiveFilterSetting != 0) {
+      StartRx (0, Snp);
+    }
   }
 
   // Update the media status
@@ -1442,19 +1457,25 @@ SnpReceive (
   if (MmioRead32 (LAN9118_INT_STS) & INSTS_RXE) {
     DEBUG ((EFI_D_WARN, "Warning: Receiver Error. Restarting...\n"));
 
-    // Initiate a software reset
+    // Software reset, the RXE interrupt is cleared by the reset.
     Status = SoftReset (0, Snp);
     if (EFI_ERROR (Status)) {
       DEBUG ((EFI_D_ERROR, "Error: Soft Reset Failed: Hardware Error.\n"));
       return EFI_DEVICE_ERROR;
     }
 
-    // Acknowledge the RXE
-    MmioWrite32 (LAN9118_INT_STS, INSTS_RXE);
-    gBS->Stall (LAN9118_STALL);
+    // Reactivate the LEDs
+    Status = ConfigureHardware (HW_CONF_USE_LEDS, Snp);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
 
-    // Restart the rx (and do not clear FIFO)
+    //
+    // Restart the receiver and the transmitter without reseting the FIFOs
+    // as it has been done by SoftReset().
+    //
     StartRx (0, Snp);
+    StartTx (START_TX_MAC | START_TX_CFG, Snp);
 
     // Say that command could not be sent
     return EFI_DEVICE_ERROR;
-- 
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