linux-kernel - Re: [PATCH] Revert "arm64: dma: Drop cache invalidation from arch_dma_prep

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Message-ID: <868rjijxsr.fsf@lausen.nl>
Date:   Thu, 08 Dec 2022 04:59:16 +0000
From:   Leonard Lausen <leonard@...sen.nl>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        catalin.marinas@....com, will@...nel.org
Cc:     robin.murphy@....com, amit.pundir@...aro.org, andersson@...nel.org,
        quic_sibis@...cinc.com, sumit.semwal@...aro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: Re: [PATCH] Revert "arm64: dma: Drop cache invalidation from
 arch_dma_prep_coherent()"

Manivannan Sadhasivam <manivannan.sadhasivam@...aro.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