[v3,00/13] Underrun on idle PSR workaround

Message

Hogander, Jouni April 14, 2025, 10:04 a.m. UTC

This patchset is implementing workaround for underrun on idle PSR HW
bug (Wa_16025596647).

It is adding notification mechanisms towards PSR for pipe
enable/disable, vblank enable/disable and enabling disabling
DC5/DC6. These notifications are used to apply/remove the workaround.

Current mechanism to block DC states while vblank is enabled on Panel
Replay capable system is extended to work for this new workaround as
well.

v3:
  - do not access DMC registers directly from PSR code
v2:
  - remove patch mistakenly added to the set
  - add missing patch

Jouni Högander (13):
  drm/i915/display: Add new interface for getting dc_state
  drm/i915/psr: Store enabled non-psr pipes into intel_crtc_state
  drm/i915/dmc: Add PIPEDMC_EVT_CTL register definition
  drm/i915/dmc: Add PIPEDMC_BLOCK_PKGC_SW definitions
  drm/i915/dmc: Add interface to block PKG C-state
  drm/i915/psr: Block PKG C-State when enabling PSR
  drm/i915/psr: Add mechanism to notify PSR of pipe enable/disable
  drm/i915/psr: Add mechanism to notify PSR of DC5/6 enable disable
  drm/i915/psr: Add interface to notify PSR of vblank enable/disable
  drm/i915/dmc: Add interface to control start of PKG C-state exit
  drm/i915/psr: Apply underrun on PSR idle workaround
  drm/i915/display: Rename intel_psr_needs_block_dc_vblank
  drm/i915/display: Rename vblank DC workaround functions and variables

 drivers/gpu/drm/i915/display/intel_crtc.c     |   6 +-
 drivers/gpu/drm/i915/display/intel_display.c  |   4 +
 .../gpu/drm/i915/display/intel_display_core.h |   6 +-
 .../drm/i915/display/intel_display_driver.c   |   3 +
 .../gpu/drm/i915/display/intel_display_irq.c  |  26 +-
 .../drm/i915/display/intel_display_power.c    |  29 ++
 .../drm/i915/display/intel_display_power.h    |   1 +
 .../i915/display/intel_display_power_well.c   |   4 +
 .../drm/i915/display/intel_display_types.h    |   5 +-
 drivers/gpu/drm/i915/display/intel_dmc.c      |  48 ++++
 drivers/gpu/drm/i915/display/intel_dmc.h      |   4 +
 drivers/gpu/drm/i915/display/intel_dmc_regs.h |  14 +
 drivers/gpu/drm/i915/display/intel_psr.c      | 255 +++++++++++++++++-
 drivers/gpu/drm/i915/display/intel_psr.h      |   8 +-
 14 files changed, 384 insertions(+), 29 deletions(-)