linux-kernel - Re: [PATCH v5 1/5] mmc: core: Extend mmc_of

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Message-ID: <9bc2454f-0b42-e256-7927-2564b56f369f@codeaurora.org>
Date:   Wed, 6 May 2020 18:30:04 +0530
From:   Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
To:     Chun-Hung Wu <chun-hung.wu@...iatek.com>, mirq-linux@...e.qmqm.pl,
        Jonathan Hunter <jonathanh@...dia.com>,
        Al Cooper <alcooperx@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michal Simek <michal.simek@...inx.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Pavel Machek <pavel@....cz>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Pan Bian <bianpan2016@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        Mathieu Malaterre <malat@...ian.org>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Kuohong Wang <kuohong.wang@...iatek.com>,
        Yong Mao <yong.mao@...iatek.com>
Cc:     kernel-team@...roid.com, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        devicetree@...r.kernel.org, wsd_upstream@...iatek.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH v5 1/5] mmc: core: Extend mmc_of_parse() to parse CQE
 bindings


On 4/28/2020 5:26 AM, Chun-Hung Wu wrote:
> Parse CQE bindings "supports-cqe" and "disable-cqe-dcmd"
> in mmc_of_parse().
>
> Signed-off-by: Chun-Hung Wu <chun-hung.wu@...iatek.com>
> ---
>   drivers/mmc/core/host.c | 5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
> index c876872..47521c6 100644
> --- a/drivers/mmc/core/host.c
> +++ b/drivers/mmc/core/host.c
> @@ -302,6 +302,11 @@ int mmc_of_parse(struct mmc_host *host)
>   		host->caps2 |= MMC_CAP2_NO_SD;
>   	if (device_property_read_bool(dev, "no-mmc"))
>   		host->caps2 |= MMC_CAP2_NO_MMC;
> +	if (device_property_read_bool(dev, "supports-cqe"))
> +		host->caps2 |= MMC_CAP2_CQE;

This change is breaking emmc driver on qcom platforms where this dt 
property is defined.

[    1.543453]  cqhci_deactivate+0xc/0x38
[    1.545627]  sdhci_msm_reset+0x40/0x58
[    1.549447]  sdhci_do_reset+0x48/0x7c
[    1.553180]  __sdhci_read_caps+0x7c/0x214
[    1.556913]  sdhci_setup_host+0x58/0xce8
[    1.560905]  sdhci_msm_probe+0x588/0x8a4
[    1.564900]  platform_drv_probe+0x4c/0xb0

So, we cant have this flag defined before sdhci_setup_host().

I will have to clear this cap and re-enable it in our initialization.

> +	if (!device_property_read_bool(dev, "disable-cqe-dcmd")) {
> +		host->caps2 |= MMC_CAP2_CQE_DCMD;
> +	}
>   
>   	/* Must be after "non-removable" check */
>   	if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {