On Fri, Jun 07, 2013 at 02:49:52PM -0700, Tony Lindgren wrote: > From: Andreas Fenkart <andreas.fenkart@xxxxxxxxxxxxxxxxxxx> > > Without functional clock the omap_hsmmc module can't forward SDIO IRQs to > the system. This patch reconfigures dat1 line as a gpio while the fclk is > off. When the fclk is present it uses the standard SDIO IRQ detection of > the module. > > The gpio irq is managed via the 'disable_depth' ref counter of the irq > subsystem, this driver simply calls enable_irq/disable_irq when needed. > > sdio irq sdio irq > unmasked masked > ----------------------------------------- > runtime default | 1 | 2 > runtime suspend | 0 | 1 > > irq disable depth > > > only when sdio irq is enabled AND the module is idle, the reference > count drops to zero and the gpio irq is effectively armed. > > Patch was tested on AM335x/Stream800. Test setup was two modules > with sdio wifi cards. Modules where connected to a dual-band AP, each > module using a different band. One of module was running iperf as server > the other as client connecting to the server in a while true loop. Test > was running for 4+ weeks. There were about 60 Mio. suspend/resume > transitions. Test was shut down regularly. > > Cc: Andreas Fenkart <afenkart@xxxxxxxxx> > Cc: Balaji T K <balajitk@xxxxxx> > Signed-off-by: Andreas Fenkart <andreas.fenkart@xxxxxxxxxxxxxxxxxxx> > Reviewed-by: Grant Likely <grant.likely@xxxxxxxxxxxx> > [tony@xxxxxxxxxxx: updated and separated out pin muxing] > Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx> right, as I discussed before the gpio part should also be split to a separate patch. That's a workaround for broken HW anyway. -- balbi
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