2f3b87124b
It was enabling and checking PSR interruptions in every transcoder
while it should keep the interruptions on the non-used transcoders
masked.
While doing this it gives us trouble on Tiger Lake if we are
reading/writing to registers of disabled transcoders since from gen12
onwards the registers are relative to the transcoder. Instead of forcing
them ON to access those registers, just avoid the accesses as they are
not needed.
v2 (Lucas):
- Explain why we can't keep accessing all transcoders
- Remove TODO about extending the irq handling to multiple instances:
when/if implementing multiple instances it's pretty clear by the
singleton psr that it needs to be extended
- Fix intel_psr_debug_set() calling psr_irq_control() with
psr.transcoder not set yet (from Imre). Now we only set the debug
register right away if psr is already enabled. Otherwise we just
record the value to be set when enabling the source.
- Do not depend on the value of TRANSCODER_A. Just be relative to it
(from Imre)
- handle psr error last so we don't schedule the work before handling
the other flags
v3:
- Adding a warning about setting reserverd bits on EDP_PSR_IMR
Cc: Imre Deak <imre.deak@intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190904213419.27547-2-jose.souza@intel.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.