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ravb: remove undocumented endianness selection

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This patch removes the use of the undocumented BOC bit of the CCC register.

Current documentation for EtherAVB (ravb) describes the offset of what the
driver uses as the BOC bit as reserved and that only a value of 0 should be
written. After some internal investigation with Renesas it remains unclear
why this driver accesses these fields but regardless of what the historical
reasons are the current code is considered incorrect.

Based on work by Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Simon Horman 2019-09-05 17:10:58 +02:00 • committed by David S. Miller
parent 009a470365
commit 2d957a7e2a
2 changed files with 0 additions and 7 deletions
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1
drivers/net/ethernet/renesas/ravb.h
View file

@ -216,7 +216,6 @@ enum CCC_BIT {
CCC_CSEL_HPB = 0x00010000,
CCC_CSEL_ETH_TX = 0x00020000,
CCC_CSEL_GMII_REF = 0x00030000,
CCC_BOC = 0x00100000, /* Undocumented? */
CCC_LBME = 0x01000000,
};

6
drivers/net/ethernet/renesas/ravb_main.c
View file

@ -447,12 +447,6 @@ static int ravb_dmac_init(struct net_device *ndev)
ravb_ring_format(ndev, RAVB_BE);
ravb_ring_format(ndev, RAVB_NC);
#if defined(__LITTLE_ENDIAN)
ravb_modify(ndev, CCC, CCC_BOC, 0);
#else
ravb_modify(ndev, CCC, CCC_BOC, CCC_BOC);
#endif
/* Set AVB RX */
ravb_write(ndev,
RCR_EFFS | RCR_ENCF | RCR_ETS0 | RCR_ESF | 0x18000000, RCR);