drm/i915/xe3lpd: Use DMC wakelock by default

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Although Bspec doesn't explicitly mentions that, as of Xe3_LPD, using
DMC wakelock is the officially recommended way of accessing registers
that would be off during DC5/DC6 and the legacy method (where the DMC
intercepts MMIO to wake up the hardware) is to be avoided.

As such, update the driver to use the DMC wakelock by default starting
with Xe3_LPD. Since the feature is somewhat new to the driver, also
allow disabling it via a module parameter for debugging purposes.

For that, make the existing parameter allow values -1 (per-chip
default), 0 (disabled) and 1 (enabled), similarly to what is done for
other parameters.

v2:
  - Describe -1 in the same area where 0 and 1 are described. (Luca)

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241108130218.24125-16-gustavo.sousa@intel.com

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This commit is contained in:

Gustavo Sousa 2024-11-08 09:57:20 -03:00 • committed by Matt Roper

parent c01e78a96e

commit 34796ce4b2

3 changed files with 9 additions and 5 deletions

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6

drivers/gpu/drm/i915/display/intel_display_params.c

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2

drivers/gpu/drm/i915/display/intel_display_params.h

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6

drivers/gpu/drm/i915/display/intel_dmc_wl.c

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