linux-kernel - RE: [PATCH V1] mmc: core: Enable force hw reset

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Date:   Tue, 24 May 2022 12:02:46 +0000
From:   "Kamasali Satyanarayan (Consultant) (QUIC)" 
        <quic_kamasali@...cinc.com>
To:     'Adrian Hunter' <adrian.hunter@...el.com>,
        quic_spathi <quic_spathi@...cinc.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "riteshh@...eaurora.org" <riteshh@...eaurora.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "avri.altman@....com" <avri.altman@....com>,
        "kch@...dia.com" <kch@...dia.com>,
        "CLoehle@...erstone.com" <CLoehle@...erstone.com>,
        "swboyd@...omium.org" <swboyd@...omium.org>,
        "digetx@...il.com" <digetx@...il.com>,
        "bigeasy@...utronix.de" <bigeasy@...utronix.de>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Sarthak Garg (QUIC)" <quic_sartgarg@...cinc.com>
CC:     Shaik Sajida Bhanu <sbhanu@...eaurora.org>
Subject: RE: [PATCH V1] mmc: core: Enable force hw reset

Hi,
These patches will be further taken by Sarthak.

Thanks,
Satya

-----Original Message-----
From: Adrian Hunter <adrian.hunter@...el.com> 
Sent: Wednesday, April 27, 2022 6:04 PM
To: quic_spathi <quic_spathi@...cinc.com>; ulf.hansson@...aro.org; riteshh@...eaurora.org; asutoshd@...eaurora.org; axboe@...nel.dk; avri.altman@....com; kch@...dia.com; CLoehle@...erstone.com; swboyd@...omium.org; digetx@...il.com; bigeasy@...utronix.de; linux-mmc@...r.kernel.org; linux-kernel@...r.kernel.org
Cc: Shaik Sajida Bhanu <sbhanu@...eaurora.org>; Kamasali Satyanarayan (Consultant) (QUIC) <quic_kamasali@...cinc.com>
Subject: Re: [PATCH V1] mmc: core: Enable force hw reset

On 26/04/22 11:30, Srinivasarao Pathipati wrote:
> From: Shaik Sajida Bhanu <sbhanu@...eaurora.org>
> 
> During error recovery set need hw reset to handle ICE error where cqe 
> reset is must.

How do you get ICE errors?  Doesn't it mean either the hardware is broken or the configuration is broken?

> 
> Signed-off-by: Shaik Sajida Bhanu <sbhanu@...eaurora.org>
> Signed-off-by: kamasali <quic_kamasali@...cinc.com>
> Signed-off-by: Srinivasarao Pathipati <quic_spathi@...cinc.com>
> ---
>  drivers/mmc/core/block.c      | 8 +++++---
>  drivers/mmc/host/cqhci-core.c | 7 +++++--
>  include/linux/mmc/host.h      | 1 +
>  3 files changed, 11 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index 
> b35e7a9..f63bf33 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -1482,10 +1482,12 @@ void mmc_blk_cqe_recovery(struct mmc_queue *mq)
>  	pr_debug("%s: CQE recovery start\n", mmc_hostname(host));
>  
>  	err = mmc_cqe_recovery(host);
> -	if (err)
> +	if (err || host->need_hw_reset) {
>  		mmc_blk_reset(mq->blkdata, host, MMC_BLK_CQE_RECOVERY);
> -	else
> -		mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
> +		if (host->need_hw_reset)
> +			host->need_hw_reset = false;
> +	}
> +	mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
>  
>  	pr_debug("%s: CQE recovery done\n", mmc_hostname(host));  } diff 
> --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c 
> index b0d30c3..311b510 100644
> --- a/drivers/mmc/host/cqhci-core.c
> +++ b/drivers/mmc/host/cqhci-core.c
> @@ -812,18 +812,21 @@ static void cqhci_finish_mrq(struct mmc_host 
> *mmc, unsigned int tag)  irqreturn_t cqhci_irq(struct mmc_host *mmc, u32 intmask, int cmd_error,
>  		      int data_error)
>  {
> -	u32 status;
> +	u32 status, ice_err;
>  	unsigned long tag = 0, comp_status;
>  	struct cqhci_host *cq_host = mmc->cqe_private;
>  
>  	status = cqhci_readl(cq_host, CQHCI_IS);
>  	cqhci_writel(cq_host, status, CQHCI_IS);
> +	ice_err = status & (CQHCI_IS_GCE | CQHCI_IS_ICCE);
>  
>  	pr_debug("%s: cqhci: IRQ status: 0x%08x\n", mmc_hostname(mmc), 
> status);
>  
>  	if ((status & (CQHCI_IS_RED | CQHCI_IS_GCE | CQHCI_IS_ICCE)) ||
> -	    cmd_error || data_error)
> +	    cmd_error || data_error || ice_err){
> +		mmc->need_hw_reset = true;
>  		cqhci_error_irq(mmc, status, cmd_error, data_error);
> +	}
>  
>  	if (status & CQHCI_IS_TCC) {
>  		/* read TCN and complete the request */ diff --git 
> a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 
> c193c50..3d00bcf 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -492,6 +492,7 @@ struct mmc_host {
>  	int			cqe_qdepth;
>  	bool			cqe_enabled;
>  	bool			cqe_on;
> +	bool                    need_hw_reset;
>  
>  	/* Inline encryption support */
>  #ifdef CONFIG_MMC_CRYPTO