linux-kernel - Re: [PATCH V2] mmc: sdhci-msm: Disable CQE during SDHC reset

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Message-ID: <da449444-1878-e387-6ebf-4ddb282a9b71@intel.com>
Date:   Wed, 4 Mar 2020 14:28:42 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Veerabhadrarao Badiganti <vbadigan@...eaurora.org>,
        ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH V2] mmc: sdhci-msm: Disable CQE during SDHC reset

On 4/03/20 1:54 pm, Veerabhadrarao Badiganti wrote:
> When SDHC gets reset (E.g. in suspend path), CQE also gets reset
> and goes to disable state. But s/w state still points it as CQE
> is in enabled state. Since s/w and h/w states goes out of sync,
> it results in s/w request timeout for subsequent CQE requests.
> 
> To synchronize CQE s/w and h/w state during SDHC reset,
> explicitly disable CQE after reset.

Shouldn't you be calling cqhci_suspend() / cqhci_resume() in the suspend and
resume paths?

> 
> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
> ---
> Changes since V1:
> 	- Disable CQE only when SDHC undergoes s/w reset for all.
> ---
>  drivers/mmc/host/sdhci-msm.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 53b79ee..75929d3 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -1823,6 +1823,13 @@ static void sdhci_msm_set_regulator_caps(struct sdhci_msm_host *msm_host)
>  	pr_debug("%s: supported caps: 0x%08x\n", mmc_hostname(mmc), caps);
>  }
>  
> +static void sdhci_msm_reset(struct sdhci_host *host, u8 mask)
> +{
> +	sdhci_reset(host, mask);
> +	if ((host->mmc->caps2 & MMC_CAP2_CQE) && (mask & SDHCI_RESET_ALL))
> +		cqhci_suspend(host->mmc);
> +}
> +
>  static const struct sdhci_msm_variant_ops mci_var_ops = {
>  	.msm_readl_relaxed = sdhci_msm_mci_variant_readl_relaxed,
>  	.msm_writel_relaxed = sdhci_msm_mci_variant_writel_relaxed,
> @@ -1861,7 +1868,7 @@ static void sdhci_msm_set_regulator_caps(struct sdhci_msm_host *msm_host)
>  MODULE_DEVICE_TABLE(of, sdhci_msm_dt_match);
>  
>  static const struct sdhci_ops sdhci_msm_ops = {
> -	.reset = sdhci_reset,
> +	.reset = sdhci_msm_reset,
>  	.set_clock = sdhci_msm_set_clock,
>  	.get_min_clock = sdhci_msm_get_min_clock,
>  	.get_max_clock = sdhci_msm_get_max_clock,
>