[RFC,00/11] Underrun on idle PSR workaround

Message

Hogander, Jouni March 7, 2025, 10:52 a.m. UTC

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

It is adding notification mechanisms toward 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.

Jouni Högander (11):
  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/psr: Write PIPEDMC_BLOCK_PKGC_SW 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/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  |  27 +-
 .../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_regs.h |  14 +
 drivers/gpu/drm/i915/display/intel_psr.c      | 271 +++++++++++++++++-
 drivers/gpu/drm/i915/display/intel_psr.h      |   8 +-
 12 files changed, 348 insertions(+), 30 deletions(-)