linux-kernel - Re: [PATCH V7 10/23] mmc: sdhci-uhs2: add reset function and uhs2

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Date:   Wed, 12 Apr 2023 16:10:05 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Victor Shih <victorshihgli@...il.com>, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        benchuanggli@...il.com, HL.Liu@...esyslogic.com.tw,
        Greg.tu@...esyslogic.com.tw, takahiro.akashi@...aro.org,
        dlunev@...omium.org, Victor Shih <victor.shih@...esyslogic.com.tw>,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>
Subject: Re: [PATCH V7 10/23] mmc: sdhci-uhs2: add reset function and
 uhs2_mode function

On 31/03/23 13:55, Victor Shih wrote:
> Sdhci_uhs2_reset() does a UHS-II specific reset operation.
> 
> Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
> ---
>  drivers/mmc/host/sdhci-uhs2.c | 46 +++++++++++++++++++++++++++++++++++
>  drivers/mmc/host/sdhci-uhs2.h |  2 ++
>  2 files changed, 48 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> index 524d7cb6f2fd..67621eaabafc 100644
> --- a/drivers/mmc/host/sdhci-uhs2.c
> +++ b/drivers/mmc/host/sdhci-uhs2.c
> @@ -10,7 +10,9 @@
>   *  Author: AKASHI Takahiro <takahiro.akashi@...aro.org>
>   */
>  
> +#include <linux/delay.h>
>  #include <linux/module.h>
> +#include <linux/iopoll.h>
>  
>  #include "sdhci.h"
>  #include "sdhci-uhs2.h"
> @@ -49,6 +51,50 @@ void sdhci_uhs2_dump_regs(struct sdhci_host *host)
>  }
>  EXPORT_SYMBOL_GPL(sdhci_uhs2_dump_regs);
>  
> +/*****************************************************************************\
> + *                                                                           *
> + * Low level functions                                                       *
> + *                                                                           *
> +\*****************************************************************************/
> +
> +bool sdhci_uhs2_mode(struct sdhci_host *host)
> +{
> +	return host->mmc->flags & MMC_UHS2_SUPPORT;
> +}
> +
> +/**
> + * sdhci_uhs2_reset - invoke SW reset
> + * @host: SDHCI host
> + * @mask: Control mask
> + *
> + * Invoke SW reset, depending on a bit in @mask and wait for completion.
> + */
> +void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask)
> +{
> +	unsigned long timeout;
> +	u32 val;
> +
> +	sdhci_writew(host, mask, SDHCI_UHS2_SW_RESET);
> +
> +	if (mask & SDHCI_UHS2_SW_RESET_FULL)
> +		host->clock = 0;
> +
> +	/* Wait max 100 ms */
> +	timeout = 100000;
> +
> +	/* hw clears the bit when it's done */
> +	if (read_poll_timeout_atomic(sdhci_readw, val, !(val & mask), 10,
> +				     timeout, true, host, SDHCI_UHS2_SW_RESET)) {
> +		pr_err("%s: %s: Reset 0x%x never completed.\n",
> +					       __func__, mmc_hostname(host->mmc), (int)mask);

CHECK: Alignment should match open parenthesis
#70: FILE: drivers/mmc/host/sdhci-uhs2.c:89:
+               pr_err("%s: %s: Reset 0x%x never completed.\n",
+                                              __func__, mmc_hostname(host->mmc), (int)mask);

> +		pr_err("%s: clean reset bit\n",
> +					       mmc_hostname(host->mmc));

Line wrap not needed

> +		sdhci_writeb(host, 0, SDHCI_UHS2_SW_RESET);
> +		return;
> +	}
> +}
> +EXPORT_SYMBOL_GPL(sdhci_uhs2_reset);
> +
>  /*****************************************************************************\
>   *                                                                           *
>   * Driver init/exit                                                          *
> diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
> index e948119348da..6834893eee85 100644
> --- a/drivers/mmc/host/sdhci-uhs2.h
> +++ b/drivers/mmc/host/sdhci-uhs2.h
> @@ -178,5 +178,7 @@
>  struct sdhci_host;
>  
>  void sdhci_uhs2_dump_regs(struct sdhci_host *host);
> +bool sdhci_uhs2_mode(struct sdhci_host *host);
> +void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);
>  
>  #endif /* __SDHCI_UHS2_H */