[PATCH 2/3] drm/i915/dp: read Aux RD interval after reading the FFE preset

[Murthy, Arun R]

> On Thu, 12 Sep 2024, Arun R Murthy <arun.r.murthy at intel.com> wrote:
> > DP Source should be reading AUX_RD interval after we get adjusted
> > TX_FFE_PRESET_VALUE from the DP Sink. (before actually adjusting in DP
> > Source)
> 
> Please explain why.
 As per the DP 2.1 spec section 3.5.2.16.1
"The transmitter shall finish reading
from DPCD 00202h through 00207h, DPCD 0200Ch through 0200Fh, and DPCD 02216h, and
writing to DPCD 00103h through 00106h (listed as "AUX TX response" in Figure 3-51) within
2.5 ms or less, such that the total duration for AUX TX responses with a 20-loop count does not
exceed 50 ms. "

Thanks and Regards,
Arun R Murthy
--------------------