> -----Original Message----- > From: "Högander" Jouni [mailto:jouni.hogander@xxxxxxxxx] > Sent: Wednesday, August 13, 2008 12:47 PM > To: ext Rajendra Nayak > Cc: linux-omap@xxxxxxxxxxxxxxx > Subject: Re: [PATCH 04/10] OMAP3 SRF: OMAP PM srf implementation > > Hello Rajendra, > > "ext Rajendra Nayak" <rnayak@xxxxxx> writes: > > > +/* > > + * Powerdomain usecounting hooks > > + */ > > + > > +void omap_pm_pwrdm_active(struct powerdomain *pwrdm) { > > + char *res_name; > > + > > + if (!pwrdm) { > > + WARN_ON(1); > > + return; > > + }; > > + > > + if (!strcmp(pwrdm->name, "wkup_pwrdm") || > > + !strcmp(pwrdm->name, "core_pwrdm")) > > + return; > > + > > + pr_debug("OMAP PM: powerdomain %s is becoming active\n", > > +pwrdm->name); > > + > > + res_name = get_lat_res_name(pwrdm->name); > > + /* Request for a zero latency which puts the Power > Domain in ON state*/ > > + resource_request(res_name, &omap_pm_dev, 0); > > + return; > > +} > > + > > +void omap_pm_pwrdm_inactive(struct powerdomain *pwrdm) { > > + char *res_name; > > + > > + if (!pwrdm) { > > + WARN_ON(1); > > + return; > > + }; > > + > > + if (!strcmp(pwrdm->name, "wkup_pwrdm") || > > + !strcmp(pwrdm->name, "core_pwrdm")) > > + return; > > + > > + pr_debug("OMAP PM: powerdomain %s is becoming inactive\n", > > + pwrdm->name); > > + > > + res_name = get_lat_res_name(pwrdm->name); > > + /* Release the latency requested */ > > + resource_release(res_name, &omap_pm_dev); > > + return; > > +} > > For what these two functions are? Why they are > requesting/releasing resource? Its needed so that a power domain is turned ON while the first clock node in it is requested, and turned OFF while the last clock node is disabled. > > > + > > +/* > > + * Should be called before clk framework since clk fw will call > > + * omap_pm_pwrdm_{in,}active() > > + */ > > +int __init omap_pm_if_early_init(void) { > > + return 0; > > +} > > Why clock framework (omap2_clkdm_clk_enable/disable) is > calling omap_pm_pwrdm_{in,}active()? Is it for keeping track > of OFF transitions? This is for clockdomain layer to indicate that a powerdomain should wake up or be put to sleep > > -- > Jouni Högander > > > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
