Tomi Valkeinen <tomi.valkeinen@xxxxxx> writes: > On Tue, 2012-10-09 at 13:37 -0700, Kevin Hilman wrote: >> Hi Tomi, >> >> Tomi Valkeinen <tomi.valkeinen@xxxxxx> writes: >> >> > This patch converts vrfb library into a platform device, in an effort to >> > remove omap dependencies. >> > >> > The platform device is registered in arch/arm/plat-omap/fb.c and >> > assigned resources depending on whether running on omap2 or omap3. >> > >> > The vrfb driver will parse those resources and use them to access vrfb >> > configuration registers and the vrfb virtual rotation areas. >> > >> > Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx> >> > Cc: Tony Lindgren <tony@xxxxxxxxxxx> >> >> [...] >> >> I was having a quick look at this for the context save/restore piece in >> order to understand how this driver's context is being saved/restored. >> >> Looking at mainline, I don't see where omap_vrfb_restore_context() is >> being called currently. Am I missing something? > > No, the driver is missing something. I noticed the same thing. It seems > ctx restore for vrfb has never been functional in mainline. I don't > really have any recollection if this was left out intentionally from > mainline (possibly because we didn't have a good way to handle it at > that point), or was it just a mistake. > > Nobody has complained about it, though, so it can't be a major problem > =). heh > Vrfb is a platform device/driver after this patch. Do you see any > problem with handling the context restore in runtime PM's runtime_resume > callback? No, that's the right way to handle it IMO. In fact, that's what I was going to check on when reviewing this patch when I noticed that the restore function wasn't being used. > Hmm, I guess then we could have a problem if omapdss and > omapfb are resumed before vrfb. Possibly, but this could be handled by adding some sanity checks, or having VRFB functions return -EAGAIN if it hasn't been resumed. Or better yet, VRFB functions should be using runtime PM get/put themselves, if they're used by omapdss/omapfb, a runtime resume (and context restore) is forced. (disclaimer: I don't actually know how VRFB works, so maybe this isn't possible.) > Any way to manage the suspend/resume ordering of unrelated (i.e. no > parent/child relation) devices? No good way at the moment. And to make things interesting: static suspend/resume ordering is not dependent on parent/child. It's based on driver discover/probe order. runtime PM ordering manages parent/child relationships. Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
