[Why]
The new aux implementation was not up to spec. This caused us to fail DP
compliance as well as introduced serious delays during system resume.
[How]
Make dce_aux_transfer_raw return the operation result
Make dce_aux_transfer_with_retries delay with udelay instead
of msleep, and only on invalid reply. Also fail on the second
invalid reply, third timeout, or first of any other error
Convert return values to drm error codes in amdgpu_dm
As the two aux transfer functions are now noticeably
different, change the names to better reflect their
functionality and document.
There was one last call to dc_link_aux_transfer that
should have retries, fix that
Signed-off-by: David Francis <David.Francis@amd.com>
Signed-off-by: Thomas Lim <Thomas.Lim@amd.com>
Reviewed-by: David Francis <David.Francis@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Acked-by: Eric Yang <eric.yang2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[Why]
It is huge, unmaintainable, needlessly layered, and obsolete
[How]
Remove it. All of it. Also remove the i2caux struct in
dc_context and the code that created and destructed it
Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[Why]
The aux_engine struct is needlessly complex and
is defined multiple times. It contains function pointers
that each have only one version and are called only from
inside dce_aux.
[How]
Replace aux_engine with a new struct called dce_aux.
Remove all function pointers and call functions directly.
Remove unused functions
Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[Why]
The old aux interface goes through i2caux and the aux_engine
and engine function pointers. The multiple layers of indirection
make it hard to tell waht is happening. The aux algorithm
does not need to be this complicated: attempt to submit the
request. If you get an ack (reply = 0), stop. Otherwise,
retry, up to 7 times.
[How]
Add a new helper function in dce_aux that performs aux retries
Move the plumbing of the aux calling code into dce_aux
Add functions in ddc that redirect directly to dce_aux
Make all aux calls use these functions
Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[Why]
engine and aux_engine are unnecessary layers we want to remove this
layer.
[How]
flatten engine and aux engine structs into one struct called
aux_engine and remove all references to the engine struct.
Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[Why]
Aux engine is created from i2caux layer. We want to remove this layer
and use the engine directly.
[How]
Decouple aux engine from i2caux. Move aux engine related code to dce folder and use
dc resource pool to manage the engine. And use the engine functions directly
Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
