linux-kernel - Re: [PATCH v3 3/7] mmc: sdhci-brcmstb: Fix SDHCI_RESET

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Message-ID: <9e15ffc5-fda9-b2c2-97f1-866c51bde113@gmail.com>
Date:   Mon, 24 Oct 2022 11:04:42 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Brian Norris <briannorris@...omium.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Shawn Lin <shawn.lin@...k-chips.com>, linux-mmc@...r.kernel.org,
        Al Cooper <alcooperx@...il.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Michal Simek <michal.simek@...inx.com>,
        linux-kernel@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-arm-msm@...r.kernel.org, Haibo Chen <haibo.chen@....com>,
        Andy Gross <agross@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Faiz Abbas <faiz_abbas@...com>,
        Jonathan Hunter <jonathanh@...dia.com>
Subject: Re: [PATCH v3 3/7] mmc: sdhci-brcmstb: Fix SDHCI_RESET_ALL for CQHCI

On 10/24/22 10:54, Brian Norris wrote:
>   [[ NOTE: this is completely untested by the author, but included solely
>      because, as noted in commit df57d73276b8 ("mmc: sdhci-pci: Fix
>      SDHCI_RESET_ALL for CQHCI for Intel GLK-based controllers"), "other
>      drivers using CQHCI might benefit from a similar change, if they
>      also have CQHCI reset by SDHCI_RESET_ALL." We've now seen the same
>      bug on at least MSM, Arasan, and Intel hardware. ]]
> 
> SDHCI_RESET_ALL resets will reset the hardware CQE state, but we aren't
> tracking that properly in software. When out of sync, we may trigger
> various timeouts.
> 
> It's not typical to perform resets while CQE is enabled, but this may
> occur in some suspend or error recovery scenarios.
> 
> Include this fix by way of the new sdhci_and_cqhci_reset() helper.
> 
> Fixes: d46ba2d17f90 ("mmc: sdhci-brcmstb: Add support for Command Queuing (CQE)")
> Signed-off-by: Brian Norris <briannorris@...omium.org>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian