tree 38db7d1d3ac6e44b52f2f27d1c28d892e2e2a868
parent c0877829ada0406233aee5bd54f6813db79d5f1f
author Douglas Anderson <dianders@chromium.org> 1686928479 -0700
committer Bjorn Andersson <andersson@kernel.org> 1687461612 -0700

arm64: dts: qcom: sc7180: Mark SCM as dma-coherent for IDP

sc7180-idp is, for most intents and purposes, a trogdor device.
Specifically, sc7180-idp is designed to run the same style of firmware
as trogdor devices. This can be seen from the fact that IDP has the
same "Reserved memory changes" in its device tree that trogdor has.

Recently it was realized that we need to mark SCM as dma-coherent to
match what trogdor's style of firmware (based on TF-A) does [1]. That
means we need this dma-coherent tag on IDP as well.

Without this, on newer versions of Linux, specifically those with
commit 7bd6680b47fa ("Revert "Revert "arm64: dma: Drop cache
invalidation from arch_dma_prep_coherent()"""), WiFi will fail to
work. At bootup you'll see:

  qcom_scm firmware:scm: Assign memory protection call failed -22
  qcom_rmtfs_mem 94600000.memory: assign memory failed
  qcom_rmtfs_mem: probe of 94600000.memory failed with error -22

[1] https://lore.kernel.org/r/20230615145253.1.Ic62daa649b47b656b313551d646c4de9a7da4bd4@changeid

Fixes: 7bd6680b47fa ("Revert "Revert "arm64: dma: Drop cache invalidation from arch_dma_prep_coherent()""")
Fixes: f5ab220d162c ("arm64: dts: qcom: sc7180: Add remoteproc enablers")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20230616081440.v2.2.I3c17d546d553378aa8a0c68c3fe04bccea7cba17@changeid
Signed-off-by: Bjorn Andersson <andersson@kernel.org>