On 10/22/2015 1:44 AM, Damien Lespiau wrote:
On Thu, Oct 22, 2015 at 12:01:21AM +0530, Thulasimani, Sivakumar wrote:
On 8/25/2015 2:50 AM, Vivi, Rodrigo wrote:
On Mon, 2015-08-24 at 19:54 +0000, Zanoni, Paulo R wrote:
Em Qui, 2015-08-20 às 16:23 -0700, Rodrigo Vivi escreveu:
Let's use a native read with retry as suggested per spec to
fix Sink CRC on SKL when PSR is enabled.
With PSR enabled panel is probably taking more time to wake
and dpcd read is faling.
Does this commit actually fix any known problem with Sink CRC? Or is
it
just a try? It would be nice to have this clarified in the commit
message.
It was just a try but that made sink crc working on my SKL when PSR is
enabled. nothing much to add...
SKL has new register AUX_MUTEX which should be used when accessing dpcd
on edp. just searched the nightly code and could not find it. it might be
the reason
for random dpcd failures reported in the other thread.
We had patches for that back in December 2013 :)
The feedback from Art was:
The non-software aux users are PSR/SRD and GTC.
Better leave out the mutex for now. Hardware is going to try do the
arbitration itself. I expect you will then need to increase any software
timeout you may have.
Do you know if anything has changed since then?
Not sure, it is in the bspec sequence to use AUX hence forwarded. Art
might be the
right person to contact :). it might be due to some minor DPCD access
issues we
observed in BDW when PSR was enabled.
regards,
Sivakumar
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