ssb: how did we get special reject bit for SSB rev 2.3?

[Rafał Miłecki]

I've just received 14e4:4312 card which is G-PHY BCM4311.

I've checked for SSB rev in MMIO dump:
read32 0xfaafcff8 -> 0x100422c5

0x100422c5 & (SSB_IDLOW_SSBREV == 0xF0000000) = 0x10000000
So this is SSB rev 2.3:
#define  SSB_IDLOW_SSBREV_23	0x10000000 /* 2.3 */

Currently we are using different REJECT bit for SSB rev 2.3:
#define  SSB_TMSLOW_REJECT	0x00000002 /* Reject (Standard Backplane) */
#define  SSB_TMSLOW_REJECT_23	0x00000004 /* Reject (Backplane rev 2.3) */

Does anyone know where did we get this from?

wl does never use this bit:

$ grep "ssb_write32(0xf98)" wl.4312.txt | sort | uniq
ssb_write32(0xf98) <- 0x00000003
ssb_write32(0xf98) <- 0x00010000
ssb_write32(0xf98) <- 0x00010002
ssb_write32(0xf98) <- 0x00030003
ssb_write32(0xf98) <- 0x00040003
ssb_write32(0xf98) <- 0x00070000
ssb_write32(0xf98) <- 0x00070001
ssb_write32(0xf98) <- 0x00070003
ssb_write32(0xf98) <- 0x20010000
ssb_write32(0xf98) <- 0x20010002
ssb_write32(0xf98) <- 0x20040003
ssb_write32(0xf98) <- 0x20070000
ssb_write32(0xf98) <- 0x20070001
ssb_write32(0xf98) <- 0x20070003

-- 
Rafał