Re: VIA EPIA problem

[H.Rosmanith]

> On Wed, 2002-10-30 at 22:13, H.Rosmanith (Kernel Mailing List) wrote:
> > please see my posts to lkml some months (2, 3?) ago. there's a problem
> > which stops the via-rhine. a small two-line patch will solve the problem.
> > search in the archives for "via" and "path", because I made a typo
> > and wrote "path" instead of "patch".
> 
> Can you forward another copy to the list if you have it handy ?

okay. please note it's a workaround. but it worked at least for
my board (and I have a via epia itx 500Mhz). this board seems to
be the only one which had the problems with the vt6103 onboard
ethernet-chip.

--- via-rhine.c.p9-debug      Thu Aug 29 07:14:12 2002
+++ via-rhine.c       Thu Aug 29 07:12:43 2002
@@ -100,6 +100,15 @@
      - allow selecting backoff algorithm (module parameter)
      - cosmetic cleanups, remove 3 unused members of struct netdev_private

+     preliminary: (Herbert Rosmanith):
+     - for some yet unknown reason (which seems to be collision-related),
+      TX DMA is off in via_rhine_interrupt in the ChipCmd register. this
+      leads to an entry in the ringbuffer which is never processed and
+      therefore blocks the ringbuffer. the hack provided sets the TxRingPtr
+      in the chip to the entry blocking the ringbuffer, marking it for
+      being processed again. this error seems to happen only with the VT6103.> +
 */

 #define DRV_NAME     "via-rhine"
@@ -474,6 +483,8 @@

 #define MAX_MII_CNT  4
 struct netdev_private {
+     // XXX hack hack hack
+     int intr_cmd;
      /* Descriptor rings */
      /* Descriptor rings */
      struct rx_desc *rx_ring;
      struct tx_desc *tx_ring;
@@ -1294,11 +1305,13 @@
 static void via_rhine_interrupt(int irq, void *dev_instance, struct pt_regs *rgs)
 {
      struct net_device *dev = dev_instance;
+     struct netdev_private *np=dev->priv;
      long ioaddr;
      u32 intr_status;
      int boguscnt = max_interrupt_work;

      ioaddr = dev->base_addr;
+     np->intr_cmd=readw(ioaddr+ChipCmd); // needed later in via_rhine_tx

      while ((intr_status = readw(ioaddr + IntrStatus))) {
              /* Acknowledge all of the current interrupt sources ASAP. */
@@ -1350,8 +1363,12 @@
              if (debug > 6)
                      printk(KERN_DEBUG " Tx scavenge %d status %8.8x.\n",
                                 entry, txstatus);
-             if (txstatus & DescOwn)
+             if (txstatus & DescOwn) {
+                     if ((np->intr_cmd&0x0010)==0) // Gack! DMA is off
+                             writel(np->tx_ring_dma + entry * sizeof(struct tx_desc),
+                                     dev->base_addr+TxRingPtr);
                      break;
+             }
              if (txstatus & 0x8000) {
                      if (debug > 1)
                              printk(KERN_DEBUG "%s: Transmit error, Tx status %8.8x.\n",