gianfar: Revert BQL support in Gianfar

Remove BQL support from Gianfar. The original upstream
commit that added BQL to Gianfar does not revert cleanly:
"d8a0f1b gianfar: Add support for byte queue limits."

BQL has been integrated in Gianfar by the upstream comunity
with no clear reason why would it be required for this driver.
Only a few drivers have it integrated. It adds overhead to the
Tx path and potential functional issues as BQL may stop the
transmission, which could result in tx timeout.

The current BQL support in Gianfar breaks the Tx timestamping
functionality. The fix is non-trivial (adding more overhead) and
still under debate in upstream.

Signed-off-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Change-Id: I125690a91cfc1f2cc955af4aa11ed9b8c00a5f08
Reviewed-on: http://git.am.freescale.net:8181/2262
Reviewed-by: Fleming Andrew-AFLEMING <AFLEMING@freescale.com>
Tested-by: Fleming Andrew-AFLEMING <AFLEMING@freescale.com>

0 files changed, 0 insertions, 0 deletions