linux-kernel - Re: [PATCH v2] mmc: sdhci: fix wakeup configuration

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Message-ID: <573EF90B.7000109@intel.com>
Date:	Fri, 20 May 2016 14:46:19 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Ludovic Desroches <ludovic.desroches@...el.com>,
	ulf.hansson@...aro.org
Cc:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	nicolas.ferre@...el.com, kliu5@...vell.com, jlfu@...vell.com,
	jszhang@...vell.com
Subject: Re: [PATCH v2] mmc: sdhci: fix wakeup configuration

On 13/05/16 16:16, Ludovic Desroches wrote:
> Activating wakeup event is not enough to get a wakeup signal. The
> corresponding events have to be enabled in the Interrupt Status Enable
> Register too. It follows the specification and is needed at least by
> sdhci-of-at91.
> 
> Signed-off-by: Ludovic Desroches <ludovic.desroches@...el.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>


> ---
>  drivers/mmc/host/sdhci.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> Changes:
> - v2:
>   - update commit message and comments
>   - do not rename val and mask variables
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index e010ea4..e351859 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2605,18 +2605,31 @@ static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
>  \*****************************************************************************/
>  
>  #ifdef CONFIG_PM
> +/*
> + * To enable wakeup events, the corresponding events have to be enabled in
> + * the Interrupt Status Enable register too. See 'Table 1-6: Wakeup Signal
> + * Table' in the SD Host Controller Standard Specification.
> + * It is useless to restore SDHCI_INT_ENABLE state in
> + * sdhci_disable_irq_wakeups() since it will be set by
> + * sdhci_enable_card_detection() or sdhci_init().
> + */
>  void sdhci_enable_irq_wakeups(struct sdhci_host *host)
>  {
>  	u8 val;
>  	u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
>  			| SDHCI_WAKE_ON_INT;
> +	u32 irq_val = SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
> +		      SDHCI_INT_CARD_INT;
>  
>  	val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
>  	val |= mask ;
>  	/* Avoid fake wake up */
> -	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
> +	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) {
>  		val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
> +		irq_val &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
> +	}
>  	sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
> +	sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
>  }
>  EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
>  
>