linux-kernel - [PATCH 00/17] drm/msm: Support for Inter Frame Power Collapse (IFPC) feature

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Message-Id: <20250720-ifpc-support-v1-0-9347aa5bcbd6@oss.qualcomm.com>
Date: Sun, 20 Jul 2025 17:46:01 +0530
From: Akhil P Oommen <akhilpo@....qualcomm.com>
To: Rob Clark <robin.clark@....qualcomm.com>, Sean Paul <sean@...rly.run>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Akhil P Oommen <akhilpo@....qualcomm.com>
Subject: [PATCH 00/17] drm/msm: Support for Inter Frame Power Collapse
 (IFPC) feature

This patch series introduces the IFPC feature to the DRM-MSM driver for
Adreno GPUs. IFPC enables GMU to quickly transition GPU into a low power
state when idle and quickly resume gpu to active state upon workload
submission, hence the name 'Inter Frame Power Collapse'. Since the KMD is
unaware of these transitions, it must perform a handshake with the
hardware (eg: fenced_write, OOB signaling etc) before accessing registers
in the GX power domain.

Initial patches address a few existing issues that were not exposed in the
absence of IFPC. With IFPC, msm_devfreq_idle becomes redundant and
therefore it is disabled for GPUs that support this feature. Additionally,
the DCVS tunings have been relaxed for GPUs with IFPC support to further
improve power savings.

This series also adds the necessary restore register list for X1-85 GPU
and enables IFPC support for it.

To: Rob Clark <robin.clark@....qualcomm.com>
To: Sean Paul <sean@...rly.run>
To: Konrad Dybcio <konradybcio@...nel.org>
To: Dmitry Baryshkov <lumag@...nel.org>
To: Abhinav Kumar <abhinav.kumar@...ux.dev>
To: Jessica Zhang <jessica.zhang@....qualcomm.com>
To: Marijn Suijten <marijn.suijten@...ainline.org>
To: David Airlie <airlied@...il.com>
To: Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Cc: freedreno@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org

Signed-off-by: Akhil P Oommen <akhilpo@....qualcomm.com>
---
Akhil P Oommen (17):
      drm/msm: Update GMU register xml
      drm/msm: a6xx: Refactor a6xx_sptprac_enable()
      drm/msm: a6xx: Fix gx_is_on check for a7x family
      drm/msm/a6xx: Poll additional DRV status
      drm/msm/a6xx: Fix PDC sleep sequence
      drm/msm: Add an ftrace for gpu register access
      drm/msm/adreno: Add fenced regwrite support
      drm/msm/a6xx: Set Keep-alive votes to block IFPC
      drm/msm/a6xx: Switch to GMU AO counter
      drm/msm/a6xx: Poll AHB fence status in GPU IRQ handler
      drm/msm: Add support for IFPC
      drm/msm: Skip devfreq IDLE when possible
      drm/msm/a6xx: Fix hangcheck for IFPC
      drm/msm/adreno: Disable IFPC when sysprof is active
      drm/msm/a6xx: Make crashstate capture IFPC safe
      drm/msm/a6xx: Enable IFPC on Adreno X1-85
      drm/msm/adreno: Relax devfreq tunings

 drivers/gpu/drm/msm/adreno/a6xx_catalog.c         |  67 ++++++-
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c             | 107 ++++++++++--
 drivers/gpu/drm/msm/adreno/a6xx_gmu.h             |  11 ++
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c             | 203 ++++++++++++++++++----
 drivers/gpu/drm/msm/adreno/a6xx_gpu.h             |   3 +
 drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c       |  10 +-
 drivers/gpu/drm/msm/adreno/a6xx_hfi.c             |  33 +++-
 drivers/gpu/drm/msm/adreno/a6xx_preempt.c         |  40 +++--
 drivers/gpu/drm/msm/adreno/adreno_gpu.h           |   1 +
 drivers/gpu/drm/msm/msm_gpu.h                     |   9 +
 drivers/gpu/drm/msm/msm_gpu_devfreq.c             |  13 ++
 drivers/gpu/drm/msm/msm_gpu_trace.h               |  12 ++
 drivers/gpu/drm/msm/msm_submitqueue.c             |   4 +
 drivers/gpu/drm/msm/registers/adreno/a6xx_gmu.xml |  11 ++
 14 files changed, 449 insertions(+), 75 deletions(-)
---
base-commit: 88bf743cabe5793d24f831ef8240a0bf90e5fd44
change-id: 20241216-ifpc-support-3b80167b3532

Best regards,
-- 
Akhil P Oommen <akhilpo@....qualcomm.com>