ad9361: Enable single shot Rx Quad Cal

Patch provides an alternative resolution to issue #807

"B210: severe distortion on In-phase data for some gain settings"

Rx quadrature tracking, an active input-sensitive loop, causes problems
on a handful of receive signals. Problematic signals include pulsed GMSK
and near-DC tones among others.

As an alternative, improve operation when active tracking is disabled.
Run single shot quadrature calibration at the following events to provide
calibrated image suppression. The corrections without active tracking are
not input dependent.

Rx quadrature single shot calibration points:

    1. AD9361 initialization
    2. Clock rate change
    3. Tuning differences greater then 100 MHz when tracking is disabled

Note that if tracking is enabled (default case), this patch has no effect
during streaming. Only the non-default (user set) case is affected.

Signed-off-by: Tom Tsou <tom.tsou@ettus.com>

0 files changed, 0 insertions, 0 deletions