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SubjectRe: [PATCH v2] mmc: sdhci: fix wakeup configuration
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On 20/05/2016 4:39 p.m., Ulf Hansson wrote:
> On 20 May 2016 at 13:46, Adrian Hunter <adrian.hunter@intel.com> wrote:
>> 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@atmel.com>
>>
>> Acked-by: Adrian Hunter <adrian.hunter@intel.com>
>
> Is this material for stable and as a fix for 4.6?

Not as far as I know.

>
> Kind regards
> Uffe
>
>>
>>
>>> ---
>>> 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);
>>>
>>>
>>

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