linux.git/drivers/gpu/drm/amd/display/dmub/src, branch v5.7

drm/amd/display: Allocate scratch space for DMUB CW7

2020-03-19T04:03:04+00:00

[Why]
The scratch space can be used to pass data between x86 and DMCUB.  DMCUB
will manage the actually mapping of CW7 internally, driver does not
program the window.

[How]
Allocate extra space within the DMUB service's framebuffer for this
scratch space and expose them from the service for use in DC.

Signed-off-by: Wyatt Wood 
Reviewed-by: Nicholas Kazlauskas 
Acked-by: Rodrigo Siqueira 
Signed-off-by: Alex Deucher

drm/amd/display: Wait for DMCUB to finish loading before executing commands

2020-02-25T16:03:15+00:00

[Why]
When we execute the first command for ASIC_INIT for command table
offloading we can hit a timing scenario such that the interrupts
for the inbox wptr haven't been enabled yet and the first command
is ignored until the second command is sent.

[How]
This happens when either the SCRATCH0 is already the correct status
code or autoload check is unsupported.

Clear SCRATCH0 during reset.

Also ensure that we don't accidentally reset the ASIC again in case
of a hang by clearing GPINT while we're at it.

Signed-off-by: Nicholas Kazlauskas 
Reviewed-by: Chris Park 
Acked-by: Rodrigo Siqueira 
Acked-by: Harry Wentland 
Signed-off-by: Alex Deucher

drm/amd/display: Use fb_base/fb_offset if available for translation

2020-02-11T16:51:01+00:00

[Why]
In the case where we do have these passed in then we should be using
these instead of the registers - those are only programmed when booting
the adapter as primary.

[How]
Check if fb_base/fb_offset are non-zero. The value of 0 is invalid
for fb_base but is valid for fb_offset on dGPU.

Signed-off-by: Nicholas Kazlauskas 
Reviewed-by: Aric Cyr 
Reviewed-by: Yongqiang Sun 
Acked-by: Rodrigo Siqueira 
Signed-off-by: Alex Deucher

drm/amd/display: Wait for clean shutdown in DMCUB reset

2020-02-06T20:04:37+00:00

[Why]
The DMCUB may be currently executing commands when the reset is
triggered.

Before issuing a reset we should first wait for the DMCUB to finish
its work.

[How]
Send the GPINT command for halting the firmware before reset.

Get the ack for the command then wait for the scratch register to
become the correct value.

We want this to take under ~40us or so at most before we force reset
to cover PHY delay sequence max time.

Each register read will be at least ~1-3us so don't bother using udelay.

Signed-off-by: Nicholas Kazlauskas 
Reviewed-by: Tony Cheng 
Acked-by: Bhawanpreet Lakha 
Signed-off-by: Alex Deucher

drm/amd/display: Add GPINT handler interface

2020-02-06T20:04:37+00:00

[Why]
The General Purpose Interrupt is used on the DMCUB to pass lightweight
commands via a register to the DMCUB.

This is limited to 32-bit command and 32-bit response.

This will be used for shutting down the firmware in a clean manner.

[How]
Add the command IDs and the data register to correctly format
the commands.

Add the interface functions to dmub_srv for sending and receiving the
commands.

Signed-off-by: Nicholas Kazlauskas 
Reviewed-by: Tony Cheng 
Acked-by: Bhawanpreet Lakha 
Signed-off-by: Alex Deucher

drm/amd/display: Check hw_init state when determining if DMCUB is initialized

2020-01-22T21:55:28+00:00

[Why]
CW2 may already be programmed when coming back from S4. In this case
we want to unconditionally replace whatever DMCUB version is currently
enabled with the latest.

[How]
Check the hw_init flag to know whether or not we've previously executed
the initliazed routine.

Signed-off-by: Nicholas Kazlauskas 
Reviewed-by: Tony Cheng 
Acked-by: Bhawanpreet Lakha 
Signed-off-by: Alex Deucher

drm/amd/display: Reset inbox rptr/wptr when resetting DMCUB

2020-01-22T21:55:28+00:00

[Why]
These logically make sense more to be set after the DMCUB has been
reset rather than when we setup the inbox.

[How]
Move them into the reset callback.

Signed-off-by: Nicholas Kazlauskas 
Reviewed-by: Tony Cheng 
Acked-by: Bhawanpreet Lakha 
Signed-off-by: Alex Deucher

drm/amd/display: Add hardware reset interface for DMUB service

2020-01-22T21:55:28+00:00

[Why]
We'll need this to perform a clean shutdown before unloading the driver.

[How]
It will call reset internally and set hw_init to false. It won't do
anything if the hardware isn't initialized.

Signed-off-by: Nicholas Kazlauskas 
Reviewed-by: Tony Cheng 
Acked-by: Bhawanpreet Lakha 
Signed-off-by: Alex Deucher

drm/amd/display: Get fb base and fb offset for DMUB from registers

2020-01-22T21:55:27+00:00

[Why]
Under some hardware initialization sequences the fb base/fb offset
provided can be zero or hardwareinit can happen too late.

We want to ensure that we always have the correct fb_base/fb_offset
when performing DMCUB hardware initialization so we can do DMCUB
command table offloading during first dc hardware init.

[How]
Read from the DCN registers. VBIOS already filled these in for us.

Signed-off-by: Nicholas Kazlauskas 
Reviewed-by: Wesley Chalmers 
Acked-by: Bhawanpreet Lakha 
Signed-off-by: Alex Deucher

drm/amd/display: Soft reset DMUIF during DMUB reset

2020-01-16T18:51:24+00:00

[Why]
We need to ensure that the DMUIF in MMHUBBUB is also in reset so we
aren't generating requests while the DMCUB is in reset.

[How]
Set DMUIF_SOFT_RESET=1 on reset and DMUIF_SOFT_RESET=0 on reset
release.

Signed-off-by: Nicholas Kazlauskas 
Reviewed-by: Tony Cheng 
Acked-by: Harry Wentland 
Acked-by: Rodrigo Siqueira 
Signed-off-by: Alex Deucher