1. 06 Apr, 2023 39 commits
  2. 03 Apr, 2023 1 commit
    • Konrad Dybcio's avatar
      drm/msm/adreno: adreno_gpu: Use suspend() instead of idle() on load error · 3eeca5e5
      Konrad Dybcio authored
      The adreno_load_gpu() path is guarded by an error check on
      adreno_load_fw(). This function is responsible for loading
      Qualcomm-only-signed binaries (e.g. SQE and GMU FW for A6XX), but it
      does not take the vendor-signed ZAP blob into account.
      
      By embedding the SQE (and GMU, if necessary) firmware into the
      initrd/kernel, we can trigger and unfortunate path that would not bail
      out early and proceed with gpu->hw_init(). That will fail, as the ZAP
      loader path will not find the firmware and return back to
      adreno_load_gpu().
      
      This error path involves pm_runtime_put_sync() which then calls idle()
      instead of suspend(). This is suboptimal, as it means that we're not
      going through the clean shutdown sequence. With at least A619_holi, this
      makes the GPU not wake up until it goes through at least one more
      start-fail-stop cycle. The pm_runtime_put_sync that appears in the error
      path actually does not guarantee that because of the earlier enabling of
      runtime autosuspend.
      
      Fix that by using pm_runtime_put_sync_suspend to force a clean shutdown.
      
      Test cases:
      1. All firmware baked into kernel
      2. error loading ZAP fw in initrd -> load from rootfs at DE start
      
      Both succeed on A619_holi (SM6375) and A630 (SDM845).
      
      Fixes: 0d997f95 ("drm/msm/adreno: fix runtime PM imbalance at gpu load")
      Signed-off-by: default avatarKonrad Dybcio <konrad.dybcio@linaro.org>
      Reviewed-by: default avatarJohan Hovold <johan+linaro@kernel.org>
      Patchwork: https://patchwork.freedesktop.org/patch/530001/
      Link: https://lore.kernel.org/r/20230330231517.2747024-1-konrad.dybcio@linaro.orgSigned-off-by: default avatarRob Clark <robdclark@chromium.org>
      3eeca5e5