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Revert "sh_eth: Enable Rx descriptor word 0 shift for r8a7790" 

This reverts commit fd9af07c34.

The hardware manual states that the frame error and multicast bits are
copied to bits 9:0 of RD0, not bits 25:16.  I've tested that this is
true for RFS1 (CRC error), RFS3 (frame too short), RFS4 (frame too
long) and RFS8 (multicast).

Also adjust a comment to agree with this.

Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2015-03-03 00:52:39 +00:00 committed by David S. Miller
parent 6ded286555
commit 9b4a6364a6
1 changed files with 2 additions and 3 deletions
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5
drivers/net/ethernet/renesas/sh_eth.c
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@ -508,7 +508,6 @@ static struct sh_eth_cpu_data r8a779x_data = {
.tpauser = 1,
.hw_swap = 1,
.rmiimode = 1,
.shift_rd0 = 1,
};
static void sh_eth_set_rate_sh7724(struct net_device *ndev)
@ -1462,8 +1461,8 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota)
/* In case of almost all GETHER/ETHERs, the Receive Frame State
* (RFS) bits in the Receive Descriptor 0 are from bit 9 to
* bit 0. However, in case of the R8A7740, R8A779x, and
* R7S72100 the RFS bits are from bit 25 to bit 16. So, the
* bit 0. However, in case of the R8A7740 and R7S72100
* the RFS bits are from bit 25 to bit 16. So, the
* driver needs right shifting by 16.
*/
if (mdp->cd->shift_rd0)