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[RESEND PATCH] mmc: sdhci: fix wakeup configuration

Started byLudovic Desroches <ludovic.desroches@atmel.com>
First post2016-05-13 11:30 +0200
Last post2016-05-13 15:00 +0200
Articles 4 — 2 participants

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  [RESEND PATCH] mmc: sdhci: fix wakeup configuration Ludovic Desroches <ludovic.desroches@atmel.com> - 2016-05-13 11:30 +0200
    Re: [RESEND PATCH] mmc: sdhci: fix wakeup configuration Adrian Hunter <adrian.hunter@intel.com> - 2016-05-13 13:50 +0200
      Re: [RESEND PATCH] mmc: sdhci: fix wakeup configuration Ludovic Desroches <ludovic.desroches@atmel.com> - 2016-05-13 14:20 +0200
        Re: [RESEND PATCH] mmc: sdhci: fix wakeup configuration Adrian Hunter <adrian.hunter@intel.com> - 2016-05-13 15:00 +0200

#1400639 — [RESEND PATCH] mmc: sdhci: fix wakeup configuration

FromLudovic Desroches <ludovic.desroches@atmel.com>
Date2016-05-13 11:30 +0200
Subject[RESEND PATCH] mmc: sdhci: fix wakeup configuration
Message-ID<ryhzY-Bj-21@gated-at.bofh.it>
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.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
---
Hi,

I just updated sdhci_enable_irq_wakeups() not sdhci_disable_irq_wakeups()
because I don't think it is necessary to configure SDHCI_INT_ENABLE at this
step, it will be done with sdhci_init() or sdhci_enable_card_detection().

While I was writing this patch, several questions came to my mind:
- Is the naming correct? wakeup signal is not an irq. 'enable_irq_wakeups' can
  be a bit confusing.
- If we want to wakeup from irq, we may have to set SDHCI_INT_ENABLE and
  SDHCI_SIGNAL_ENABLE and not rely on a previous configuration, isn't it?

Regards

Ludovic

 drivers/mmc/host/sdhci.c | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index b284924..6fc69ed 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2638,18 +2638,28 @@ 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.
+ */
 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;
+	u8 wakeup_val;
+	u8 wakeup_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 ;
+	wakeup_val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
+	wakeup_val |= wakeup_mask;
 	/* Avoid fake wake up */
-	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
-		val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
-	sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
+	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) {
+		wakeup_val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
+		irq_val &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
+	}
+	sdhci_writeb(host, wakeup_val, SDHCI_WAKE_UP_CONTROL);
+	sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
 }
 EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
 
-- 
2.5.0

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#1400719

FromAdrian Hunter <adrian.hunter@intel.com>
Date2016-05-13 13:50 +0200
Message-ID<ryjLs-2sD-19@gated-at.bofh.it>
In reply to#1400639
+ cc some Marvell people because they added this code

On 13/05/16 12:27, 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.

That seems to follow the specification.  Did you find that you actually
needed this change to get it to work?

> 
> Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
> ---
> Hi,
> 
> I just updated sdhci_enable_irq_wakeups() not sdhci_disable_irq_wakeups()
> because I don't think it is necessary to configure SDHCI_INT_ENABLE at this
> step, it will be done with sdhci_init() or sdhci_enable_card_detection().

OK, but that should be in the commit message and commented in the code too.

> 
> While I was writing this patch, several questions came to my mind:
> - Is the naming correct? wakeup signal is not an irq. 'enable_irq_wakeups' can
>   be a bit confusing.

I don't support renaming things unless the names are really really bad.
These names are OK.

> - If we want to wakeup from irq, we may have to set SDHCI_INT_ENABLE and
>   SDHCI_SIGNAL_ENABLE and not rely on a previous configuration, isn't it?

I imagine the card interrupt will occur when it is enabled.  I don't know
about card insert / remove.

What works for you?

> 
> Regards
> 
> Ludovic
> 
>  drivers/mmc/host/sdhci.c | 26 ++++++++++++++++++--------
>  1 file changed, 18 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index b284924..6fc69ed 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2638,18 +2638,28 @@ 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.
> + */
>  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;
> +	u8 wakeup_val;
> +	u8 wakeup_mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE |
> +			 SDHCI_WAKE_ON_INT;

Please don't rename variables, or tidy-up code that you are not changing.

> +	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 ;

These 2 line are actually unchanged.

> +	wakeup_val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
> +	wakeup_val |= wakeup_mask;
>  	/* Avoid fake wake up */
> -	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
> -		val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
> -	sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
> +	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) {
> +		wakeup_val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
> +		irq_val &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
> +	}
> +	sdhci_writeb(host, wakeup_val, SDHCI_WAKE_UP_CONTROL);
> +	sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
>  }
>  EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
>  
>

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#1400751

FromLudovic Desroches <ludovic.desroches@atmel.com>
Date2016-05-13 14:20 +0200
Message-ID<ryket-343-13@gated-at.bofh.it>
In reply to#1400719
On Fri, May 13, 2016 at 02:37:21PM +0300, Adrian Hunter wrote:
> + cc some Marvell people because they added this code
> 
> On 13/05/16 12:27, 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.
> 
> That seems to follow the specification.  Did you find that you actually
> needed this change to get it to work?
> 

Yes, I din't wake up on card event without this patch.

> > 
> > Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
> > ---
> > Hi,
> > 
> > I just updated sdhci_enable_irq_wakeups() not sdhci_disable_irq_wakeups()
> > because I don't think it is necessary to configure SDHCI_INT_ENABLE at this
> > step, it will be done with sdhci_init() or sdhci_enable_card_detection().
> 
> OK, but that should be in the commit message and commented in the code too.

I'll add it.

> 
> > 
> > While I was writing this patch, several questions came to my mind:
> > - Is the naming correct? wakeup signal is not an irq. 'enable_irq_wakeups' can
> >   be a bit confusing.
> 
> I don't support renaming things unless the names are really really bad.
> These names are OK.
> 
> > - If we want to wakeup from irq, we may have to set SDHCI_INT_ENABLE and
> >   SDHCI_SIGNAL_ENABLE and not rely on a previous configuration, isn't it?
> 
> I imagine the card interrupt will occur when it is enabled.  I don't know
> about card insert / remove.
> 
> What works for you?
> 

I only use wakeup events and not irqs in system PM (patches for
sdhci-of-at91 are not sent yet, I am waiting for the inclusion of other
patches).

What I mean is that if we want to wake up from irqs, it could be safer and
clearer to set explicitely SDHCI_INT_ENABLE and SDHCI_SIGNAL_ENABLE in
sdhci_enable_irq_wakeups(). It is just a thought and not needed for this
patch.

> > 
> > Regards
> > 
> > Ludovic
> > 
> >  drivers/mmc/host/sdhci.c | 26 ++++++++++++++++++--------
> >  1 file changed, 18 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > index b284924..6fc69ed 100644
> > --- a/drivers/mmc/host/sdhci.c
> > +++ b/drivers/mmc/host/sdhci.c
> > @@ -2638,18 +2638,28 @@ 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.
> > + */
> >  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;
> > +	u8 wakeup_val;
> > +	u8 wakeup_mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE |
> > +			 SDHCI_WAKE_ON_INT;
> 
> Please don't rename variables, or tidy-up code that you are not changing.
> 

I thought it will be better to have wakeup_val and irq_val instead of
val and irq_val. That's why I renamed it while introducing irq_val.

> > +	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 ;
> 
> These 2 line are actually unchanged.
> 
> > +	wakeup_val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
> > +	wakeup_val |= wakeup_mask;
> >  	/* Avoid fake wake up */
> > -	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
> > -		val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
> > -	sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
> > +	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) {
> > +		wakeup_val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
> > +		irq_val &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
> > +	}
> > +	sdhci_writeb(host, wakeup_val, SDHCI_WAKE_UP_CONTROL);
> > +	sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
> >  }
> >  EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
> >  
> > 
>

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#1400777

FromAdrian Hunter <adrian.hunter@intel.com>
Date2016-05-13 15:00 +0200
Message-ID<rykRc-3qY-13@gated-at.bofh.it>
In reply to#1400751
On 13/05/16 15:19, Ludovic Desroches wrote:
> On Fri, May 13, 2016 at 02:37:21PM +0300, Adrian Hunter wrote:
>> + cc some Marvell people because they added this code
>>
>> On 13/05/16 12:27, 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.
>>
>> That seems to follow the specification.  Did you find that you actually
>> needed this change to get it to work?
>>
> 
> Yes, I din't wake up on card event without this patch.
> 
>>>
>>> Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
>>> ---
>>> Hi,
>>>
>>> I just updated sdhci_enable_irq_wakeups() not sdhci_disable_irq_wakeups()
>>> because I don't think it is necessary to configure SDHCI_INT_ENABLE at this
>>> step, it will be done with sdhci_init() or sdhci_enable_card_detection().
>>
>> OK, but that should be in the commit message and commented in the code too.
> 
> I'll add it.
> 
>>
>>>
>>> While I was writing this patch, several questions came to my mind:
>>> - Is the naming correct? wakeup signal is not an irq. 'enable_irq_wakeups' can
>>>   be a bit confusing.
>>
>> I don't support renaming things unless the names are really really bad.
>> These names are OK.
>>
>>> - If we want to wakeup from irq, we may have to set SDHCI_INT_ENABLE and
>>>   SDHCI_SIGNAL_ENABLE and not rely on a previous configuration, isn't it?
>>
>> I imagine the card interrupt will occur when it is enabled.  I don't know
>> about card insert / remove.
>>
>> What works for you?
>>
> 
> I only use wakeup events and not irqs in system PM (patches for
> sdhci-of-at91 are not sent yet, I am waiting for the inclusion of other
> patches).

It doesn't hurt to say in the commit message what driver or hardware needed
the change.

> 
> What I mean is that if we want to wake up from irqs, it could be safer and
> clearer to set explicitely SDHCI_INT_ENABLE and SDHCI_SIGNAL_ENABLE in
> sdhci_enable_irq_wakeups(). It is just a thought and not needed for this
> patch.
> 
>>>
>>> Regards
>>>
>>> Ludovic
>>>
>>>  drivers/mmc/host/sdhci.c | 26 ++++++++++++++++++--------
>>>  1 file changed, 18 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>>> index b284924..6fc69ed 100644
>>> --- a/drivers/mmc/host/sdhci.c
>>> +++ b/drivers/mmc/host/sdhci.c
>>> @@ -2638,18 +2638,28 @@ 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.
>>> + */
>>>  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;
>>> +	u8 wakeup_val;
>>> +	u8 wakeup_mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE |
>>> +			 SDHCI_WAKE_ON_INT;
>>
>> Please don't rename variables, or tidy-up code that you are not changing.
>>
> 
> I thought it will be better to have wakeup_val and irq_val instead of
> val and irq_val. That's why I renamed it while introducing irq_val.

val and irq_val are fine.

> 
>>> +	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 ;
>>
>> These 2 line are actually unchanged.
>>
>>> +	wakeup_val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
>>> +	wakeup_val |= wakeup_mask;
>>>  	/* Avoid fake wake up */
>>> -	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
>>> -		val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
>>> -	sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
>>> +	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) {
>>> +		wakeup_val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
>>> +		irq_val &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
>>> +	}
>>> +	sdhci_writeb(host, wakeup_val, SDHCI_WAKE_UP_CONTROL);
>>> +	sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
>>>  }
>>>  EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
>>>  
>>>
>>
>

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