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