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authorYang Li <leoli@freescale.com>2010-11-25 18:29:58 -0500
committerDavid S. Miller <davem@davemloft.net>2010-11-28 21:36:57 -0500
commitd830418e4085d65b3f8bad3216a37bc986ecd17d (patch)
treeddb6dd429e12651e1416f477ca10d7d8dc0c77fc /drivers/pci/slot.c
parentb4ff3c90e6066bacc8a92111752fe9e4f4c45cca (diff)
ucc_geth: fix ucc halt problem in half duplex mode
In commit 58933c64(ucc_geth: Fix the wrong the Rx/Tx FIFO size), the UCC_GETH_UTFTT_INIT is set to 512 based on the recommendation of the QE Reference Manual. But that will sometimes cause tx halt while working in half duplex mode. According to errata draft QE_GENERAL-A003(High Tx Virtual FIFO threshold size can cause UCC to halt), setting UTFTT less than [(UTFS x (M - 8)/M) - 128] will prevent this from happening (M is the minimum buffer size). The patch changes UTFTT back to 256. Signed-off-by: Li Yang <leoli@freescale.com> Cc: Jean-Denis Boyer <jdboyer@media5corp.com> Cc: Andreas Schmitz <Andreas.Schmitz@riedel.net> Cc: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/pci/slot.c')
0 files changed, 0 insertions, 0 deletions