linux-kernel - Re: [PATCH V4 6/7] mmc: sdhci: Set error state for mmc driver

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Date:   Tue, 8 Mar 2022 12:06:26 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>,
        asutoshd@...cinc.com, ulf.hansson@...aro.org, agross@...nel.org,
        bjorn.andersson@...aro.org, linux-mmc@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     quic_vbadigan@...cinc.com, quic_rampraka@...cinc.com,
        quic_pragalla@...cinc.com, quic_sartgarg@...cinc.com,
        quic_nitirawa@...cinc.com, quic_sayalil@...cinc.com,
        Sayali Lokhande <sayalil@...eaurora.org>,
        "Bao D . Nguyen" <nguyenb@...eaurora.org>
Subject: Re: [PATCH V4 6/7] mmc: sdhci: Set error state for mmc driver

On 2.3.2022 15.03, Shaik Sajida Bhanu wrote:
> Set error state if any errors observed in eMMC and SD card driver level.
> 
> Signed-off-by: Liangliang Lu <luliang@...eaurora.org>
> Signed-off-by: Sayali Lokhande <sayalil@...eaurora.org>
> Signed-off-by: Bao D. Nguyen <nguyenb@...eaurora.org>
> Signed-off-by: Ram Prakash Gupta <quic_rampraka@...cinc.com>
> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
> ---
>  drivers/mmc/host/sdhci.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 741fb06..4ba3797 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -224,6 +224,8 @@ void sdhci_reset(struct sdhci_host *host, u8 mask)
>  		if (timedout) {
>  			pr_err("%s: Reset 0x%x never completed.\n",
>  				mmc_hostname(host->mmc), (int)mask);
> +			if (host->mmc && !host->mmc->err_state)
> +				mmc_debugfs_err_stats_enable(host->mmc);

I really do not understand why this cannot be another err_stats entry
such as MMC_ERR_DRIVER and then as below?

			sdhci_err_stats_inc(host, DRIVER);


>  			sdhci_dumpregs(host);
>  			return;
>  		}
> @@ -1716,6 +1718,8 @@ static bool sdhci_send_command_retry(struct sdhci_host *host,
>  		if (!timeout--) {
>  			pr_err("%s: Controller never released inhibit bit(s).\n",
>  			       mmc_hostname(host->mmc));
> +			if (host->mmc && !host->mmc->err_state)
> +				mmc_debugfs_err_stats_enable(host->mmc);
>  			sdhci_dumpregs(host);
>  			cmd->error = -EIO;
>  			return false;
> @@ -1965,6 +1969,8 @@ void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
>  		if (timedout) {
>  			pr_err("%s: Internal clock never stabilised.\n",
>  			       mmc_hostname(host->mmc));
> +			if (host->mmc && !host->mmc->err_state)
> +				mmc_debugfs_err_stats_enable(host->mmc);
>  			sdhci_dumpregs(host);
>  			return;
>  		}
> @@ -1987,6 +1993,8 @@ void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
>  			if (timedout) {
>  				pr_err("%s: PLL clock never stabilised.\n",
>  				       mmc_hostname(host->mmc));
> +				if (host->mmc && !host->mmc->err_state)
> +					mmc_debugfs_err_stats_enable(host->mmc);
>  				sdhci_dumpregs(host);
>  				return;
>  			}
> @@ -3162,6 +3170,8 @@ static void sdhci_timeout_timer(struct timer_list *t)
>  		mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_REQ_TIMEOUT);
>  		pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
>  		       mmc_hostname(host->mmc));
> +		if (host->mmc && !host->mmc->err_state)
> +			mmc_debugfs_err_stats_enable(host->mmc);
>  		sdhci_dumpregs(host);
>  
>  		host->cmd->error = -ETIMEDOUT;
> @@ -3185,6 +3195,8 @@ static void sdhci_timeout_data_timer(struct timer_list *t)
>  		mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_REQ_TIMEOUT);
>  		pr_err("%s: Timeout waiting for hardware interrupt.\n",
>  		       mmc_hostname(host->mmc));
> +		if (host->mmc && !host->mmc->err_state)
> +			mmc_debugfs_err_stats_enable(host->mmc);
>  		sdhci_dumpregs(host);
>  
>  		if (host->data) {
> @@ -3236,6 +3248,8 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
>  			return;
>  		pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
>  		       mmc_hostname(host->mmc), (unsigned)intmask);
> +		if (host->mmc && !host->mmc->err_state)
> +			mmc_debugfs_err_stats_enable(host->mmc);
>  		sdhci_dumpregs(host);
>  		return;
>  	}
> @@ -3289,6 +3303,8 @@ static void sdhci_adma_show_error(struct sdhci_host *host)
>  	void *desc = host->adma_table;
>  	dma_addr_t dma = host->adma_addr;
>  
> +	if (host->mmc && !host->mmc->err_state)
> +		mmc_debugfs_err_stats_enable(host->mmc);
>  	sdhci_dumpregs(host);
>  
>  	while (true) {
> @@ -3378,6 +3394,8 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
>  
>  		pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
>  		       mmc_hostname(host->mmc), (unsigned)intmask);
> +		if (host->mmc && !host->mmc->err_state)
> +			mmc_debugfs_err_stats_enable(host->mmc);
>  		sdhci_dumpregs(host);
>  
>  		return;
> @@ -3599,6 +3617,8 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
>  	if (unexpected) {
>  		pr_err("%s: Unexpected interrupt 0x%08x.\n",
>  			   mmc_hostname(host->mmc), unexpected);
> +		if (host->mmc && !host->mmc->err_state)
> +			mmc_debugfs_err_stats_enable(host->mmc);
>  		sdhci_dumpregs(host);
>  	}
>  
> @@ -3962,6 +3982,8 @@ bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
>  		sdhci_writel(host, intmask, SDHCI_INT_STATUS);
>  		pr_err("%s: CQE: Unexpected interrupt 0x%08x.\n",
>  		       mmc_hostname(host->mmc), intmask);
> +		if (host->mmc && !host->mmc->err_state)
> +			mmc_debugfs_err_stats_enable(host->mmc);
>  		sdhci_dumpregs(host);
>  	}
>