Madhusudhan wrote:
-----Original Message-----
From: David Vrabel [mailto:david.vrabel@xxxxxxx]
Sent: Wednesday, February 10, 2010 5:52 AM
To: linux-mmc@xxxxxxxxxxxxxxx
Cc: David Vrabel; linux-omap@xxxxxxxxxxxxxxx; madhu.cr@xxxxxx
Subject: [PATCH 3/3] mmc: omap_hsmmc: enable SDIO card interrupts
Enable the use of SDIO card interrupts. This requires setting ENAWAKEUP
in SYSCONFIG and IWE in HTCL to allow the MMC block to wake-up when in
smart-idle mode.
FCLK must be enabled while SDIO interrupts are enabled or the MMC block
won't wake-up.
I am curious to know the system behavior with this patch. Does the FCLK
remain enabled forever if a SDIO card is detected on the bus?
Only if card interrupts are enabled. The card irq is disabled when the
sdio_irq_thread exits.
This is why I think that smart-idle mode needs to be used (it's turned
on by default on the MMC controller) but I don't understand the
clock/clockdomain code to see if that's doing the right thing.
If smart-idle mode is used then we don't need to disable FCLK manually
to save power. This will simplify the driver a bit.
David
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