[v3,00/10] PSR DSB support

Message

Jouni Högander Jan. 9, 2025, 7:31 a.m. UTC

This patch set is doing necessary modifications to support PSR update
using DSB on LunarLake onwards

It is not necessary to wait for PSR1 to idle or PSR2 to exit DEEP
sleep at the begin of commit This is left out from DSB commit. There
might be room for optimization for non-DSB as well because such wait
is not supposed to be necessary at the begin of update.

PSR mutex is not locked when performing DSB commit. It is not
necessary as we are currently using DSB only when sending updates
towards panel. I.e. not using it when changing PSR mode. Also
necessary changes are made to use PSR2_MAN_TRK_CTL only in
DSB. Frontbuffer updates and legacy cursor updates are using SFF_CTL
register to perform full frame updates.

DSB_SKIP_WAITS_EN is kept set as otherwise DSB wait for scanline hangs
if it's entered when PSR2_STATUS[PSR2 State] == DEEP_SLEEP or
SRD_STATUS[SRD State] == SRDENT.

v3:
  - do not use DSB when PSR mode is changing
v2:
  - use _MMIO_TRANS instead of _MMIO_TRANS2
  - drop evasion from intel_psr_configure_full_frame_update

Jouni Högander (10):
  drm/i915/psr: Use PSR2_MAN_TRK_CTL CFF bit only to send full update
  drm/i915/psr: Rename psr_force_hw_tracking_exit as
    intel_psr_force_update
  drm/i915/psr: Split setting sff and cff bits away from
    intel_psr_force_update
  drm/i915/psr: Add register definitions for SFF_CTL and CFF_CTL
    registers
  drm/i915/psr: Use SFF_CTL on invalidate/flush for LunarLake onwards
  drm/i915/psr: Allow writing PSR2_MAN_TRK_CTL using DSB
  drm/i915/psr: Changes for PSR2_MAN_TRK_CTL handling when DSB is in use
  drm/i915/psr: Add intel_psr_is_psr_mode_changing
  drm/i915/display: Don't use DSB if psr mode changing
  drm/i915/psr: Allow DSB usage when PSR is enabled

 drivers/gpu/drm/i915/display/intel_display.c  |  11 +-
 drivers/gpu/drm/i915/display/intel_psr.c      | 139 +++++++++---------
 drivers/gpu/drm/i915/display/intel_psr.h      |   6 +-
 drivers/gpu/drm/i915/display/intel_psr_regs.h |  10 ++
 4 files changed, 95 insertions(+), 71 deletions(-)