linux-kernel - RE: [PATCH v8 3/3] mmc: sdhci-tegra: Issue CMD and DAT resets together

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Message-ID: <MW2PR12MB2412E92633E4A6B670DFC93EB7249@MW2PR12MB2412.namprd12.prod.outlook.com>
Date:   Fri, 14 Oct 2022 07:28:58 +0000
From:   Prathamesh Shete <pshete@...dia.com>
To:     "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Aniruddha Tvs Rao <anrao@...dia.com>,
        Suresh Mangipudi <smangipudi@...dia.com>,
        Krishna Yarlagadda <kyarlagadda@...dia.com>
Subject: RE: [PATCH v8 3/3] mmc: sdhci-tegra: Issue CMD and DAT resets
 together

Dropping 4th(following) patch in this series from previous versions as that fix is applied.
[PATCH v7 4/4] mmc: sdhci-tegra: Use actual clock rate for SW tuning correction

> -----Original Message-----
> From: Prathamesh Shete <pshete@...dia.com>
> Sent: Friday, October 14, 2022 12:55 PM
> To: adrian.hunter@...el.com; ulf.hansson@...aro.org;
> thierry.reding@...il.com; Jonathan Hunter <jonathanh@...dia.com>;
> p.zabel@...gutronix.de; linux-mmc@...r.kernel.org; linux-
> tegra@...r.kernel.org; linux-kernel@...r.kernel.org
> Cc: Aniruddha Tvs Rao <anrao@...dia.com>; Suresh Mangipudi
> <smangipudi@...dia.com>; Prathamesh Shete <pshete@...dia.com>;
> Krishna Yarlagadda <kyarlagadda@...dia.com>
> Subject: [PATCH v8 3/3] mmc: sdhci-tegra: Issue CMD and DAT resets
> together
> 
> In case of error condition to avoid system crash Tegra SDMMC controller
> requires CMD and DAT resets issued together. SDHCI controller FSM goes
> into bad state due to rapid SD card hot-plug event.
> Issuing reset on the CMD FSM before DATA FSM results in kernel panic,
> hence add support to issue CMD and DAT resets together.
> This is applicable to Tegra186 and later chips.
> 
> Signed-off-by: Aniruddha TVS Rao <anrao@...dia.com>
> Signed-off-by: Prathamesh Shete <pshete@...dia.com>
> Acked-by: Adrian Hunter <adrian.hunter@...el.com>
> Acked-by: Thierry Reding <treding@...dia.com>
> ---
>  drivers/mmc/host/sdhci-tegra.c | 3 ++-
>  drivers/mmc/host/sdhci.c       | 5 +++++
>  drivers/mmc/host/sdhci.h       | 2 ++
>  3 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index 0cd7c3f7e6f4..9fbea5bbfa4a 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -1535,7 +1535,8 @@ static const struct sdhci_pltfm_data
> sdhci_tegra186_pdata = {
>  		  SDHCI_QUIRK_NO_HISPD_BIT |
>  		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
>  		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> -	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
> +	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
> +		   SDHCI_QUIRK2_ISSUE_CMD_DAT_RESET_TOGETHER,
>  	.ops  = &tegra186_sdhci_ops,
>  };
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index
> 2b5dda521b0e..8512a69f1aae 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -270,6 +270,11 @@ enum sdhci_reset_reason {
> 
>  static void sdhci_reset_for_reason(struct sdhci_host *host, enum
> sdhci_reset_reason reason)  {
> +	if (host->quirks2 &
> +		SDHCI_QUIRK2_ISSUE_CMD_DAT_RESET_TOGETHER) {
> +		sdhci_do_reset(host, SDHCI_RESET_CMD |
> SDHCI_RESET_DATA);
> +		return;
> +	}
>  	switch (reason) {
>  	case SDHCI_RESET_FOR_INIT:
>  		sdhci_do_reset(host, SDHCI_RESET_CMD |
> SDHCI_RESET_DATA); diff --git a/drivers/mmc/host/sdhci.h
> b/drivers/mmc/host/sdhci.h index d750c464bd1e..6a5766774b05 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -478,6 +478,8 @@ struct sdhci_host {
>   * block count.
>   */
>  #define SDHCI_QUIRK2_USE_32BIT_BLK_CNT			(1<<18)
> +/* Issue CMD and DATA reset together */
> +#define SDHCI_QUIRK2_ISSUE_CMD_DAT_RESET_TOGETHER	(1<<19)
> 
>  	int irq;		/* Device IRQ */
>  	void __iomem *ioaddr;	/* Mapped address */
> --
> 2.17.1