On Thu, Jan 12, 2012 at 1:56 PM, Grazvydas Ignotas <notasas@xxxxxxxxx> wrote: > On Mon, Dec 19, 2011 at 10:01 PM, Felipe Contreras > <felipe.contreras@xxxxxxxxx> wrote: >> From: Felipe Contreras <felipe.contreras@xxxxxxxxx> >> >> In musb_init_controller() there's a pm_runtime_put(), but there's no >> pm_runtime_get(), which creates a mismatch that causes the driver to >> sleep when it shouldn't. > > This patch is causing problems here, the device never suspends, I've > verified musb_runtime_suspend and omap2430_runtime_suspend are never > called in my setup, unless I revert this patch. I'm using musb with > ethernet gadget; cable removal also doesn't suspend musb. > > It seems pm_runtime_put() that was removed was balancing out > pm_runtime_get in musb_platform_init(), which is called at the > beginning of musb_init_controller(). I think this pm_runtime_get() > from musb_platform_init() should be moved to musb_init_controller() to > stop confusing people and pm_runtime_put() needs to be brought back. I > can do a patch if nobody objects. You mean have both get and put in musb_init_controller()? That's OK, it would be balanced then, but you would have to remove the pm_runtime_put() from omap2430_remove() that presumably was balancing the pm_runtime_get_sync() in omap2430_musb_init(). >> This was introduced in 7acc619[1], but it wasn't triggered in my setup >> until 18a2689[2] was merged to Linus' branch at point df0914[3]. IOW; >> when PM is working as it was supposed to. >> >> However, it seems most of the time this is used in a way that keeps the >> counter above 0, so nobody noticed. Also, it seems to depend on the >> configuration used in versions before 3.1, but not later (or in it). >> >> I found the problem by loading isp1704_charger before any usb gadgets: >> http://article.gmane.org/gmane.linux.kernel/1226122 > > isp1704_charger seems to be doing otg_io_read(), and it's perfectly > normal that musb can be suspended at the time isp1704 decides to do > this. I think proper fix is to wake up must on musb_ulpi_read() and > musb_ulpi_write() instead. I guess so. If you send these patches I can give them a try. -- Felipe Contreras -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
