[PATCH] Revert "arm64: dma: Drop cache invalidation from arch_dma_prep_coherent()"

[Leonard Lausen]

Manivannan Sadhasivam <manivannan.sadhasivam at linaro.org> writes:
> This reverts commit c44094eee32f32f175aadc0efcac449d99b1bbf7.
>
> As reported by Amit [1], dropping cache invalidation from
> arch_dma_prep_coherent() triggers a crash on the Qualcomm SM8250 platform
> (most probably on other Qcom platforms too).

On sc7180 with c44094ee applied, it does not trigger crash but makes
Wifi dysfunctional by preventing initialization of ath10k_snoc.

qcom-q6v5-mss 4080000.remoteproc: PBL returned unexpected status -284098560

With the revert of c44094ee, wifi works fine again.

Thank you
Leonard