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lan9118: Ignore write to MAC_VLAN1 register

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On Mon, 4 Apr 2011 20:15:30 +0200, Aurelien Jarno <aurelien@aurel32.net> wrote:
> Is it really safe ignoring write to this register? If yes, it's probably
> a good idea to explain why in a comment. In any case, if supporting this
> register is easy to do, it would be the best option.

I think it is safe.  Please see an updated comment below.

And though implementing this register might be possible, I suppose it
is not worth to supporting FrameTooLong detection, for now at least.

Thank you for comments.

>8---------------------------------------------------------------------
From: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Date: Tue, 5 Apr 2011 23:12:07 +0900
Subject: [PATCH] lan9118: Ignore write to MAC_VLAN1 register

Since linux 2.6.38, smsc911x driver writes to VLAN1 registger.
Since this register only affects FrameTooLong detection, ignoring
write to this register should be safe.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Atsushi Nemoto 2011-04-05 23:34:04 +09:00 committed by Aurelien Jarno
parent eaba51c573
commit a0313c00fc
1 changed files with 6 additions and 0 deletions
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6
hw/lan9118.c
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@ -785,6 +785,12 @@ static void do_mac_write(lan9118_state *s, int reg, uint32_t val)
case MAC_FLOW:
s->mac_flow = val & 0xffff0000;
break;
case MAC_VLAN1:
/* Writing to this register changes a condition for
* FrameTooLong bit in rx_status. Since we do not set
* FrameTooLong anyway, just ignore write to this.
*/
break;
default:
hw_error("lan9118: Unimplemented MAC register write: %d = 0x%x\n",
s->mac_cmd & 0xf, val);