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net: smc91x: isolate u16 writes alignment workaround

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Writes to u16 has a special handling on 3 PXA platforms, where the
hardware wiring forces these writes to be u32 aligned.

This patch isolates this handling for PXA platforms as before, but
enables this "workaround" to be set up dynamically, which will be the
case in device-tree build types.

This patch was tested on 2 PXA platforms : mainstone, which relies on
the workaround, and lubbock, which doesn't.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Robert Jarzmik
2016-10-17 21:45:30 +02:00
committed by David S. Miller
parent 9a97434215
commit d09d747ae4
3 changed files with 47 additions and 40 deletions
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3
drivers/net/ethernet/smsc/smc91x.c
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@@ -602,7 +602,8 @@ static void smc_hardware_send_pkt(unsigned long data)
SMC_PUSH_DATA(lp, buf, len & ~1);
/* Send final ctl word with the last byte if there is one */
SMC_outw(((len & 1) ? (0x2000 | buf[len-1]) : 0), ioaddr, DATA_REG(lp));
SMC_outw(lp, ((len & 1) ? (0x2000 | buf[len - 1]) : 0), ioaddr,
DATA_REG(lp));
/*
* If THROTTLE_TX_PKTS is set, we stop the queue here. This will