>From: Pandita, Vikram > > >Proposals for OPP table handling for OMAP34xx/35xx/36xx/44xx > >Thanks to all the community members for taking time for this discussion. >This will aid upsteaming of 35xx/36xx/44xx in coming future. > >Attendees: Kevin Hilman, Paul, Nishant M, Santosh, Madhu, Benoit, Rajendra, >Benoit, Vikram > >Problem Statement: > OMAP34xx has certain opp requirements (3420/3430/3440) > OMAP35xx reuses the opp's from 34xx > OMAP36xx has a totally new set of opps > OMAP44xx has a totally new set of opps > >Solution: > Align on a common approach to take for the Opp table definitions. > >Define Separate Tables for each family as follows: >Step 1: Go with this approach: > 3420(65nm) : new arrays [defer for now] > 3430/35xx(65nm) : new arrays ** > 3440(65nm) : new arrays [defer for now] > 3630(45nm) : new arrays > Omap4(45nm) : new arrays > > * new arrays = (mpu, dsp, l3) > ** Check this valid flag. Kevin can take this base on comments > http://marc.info/?l=linux-omap&m=125512448216071&w=2 > between 3430/35xx, opp's can be managed with a flag and same >table re-used > 35xx has requirement for 720Mhz opp > >Step 2: >Kevin suggestion: >Define accessor APIs get the OPPs >Check Users of accessor API > DVFS > constraints > sysfs debug > Define accessor api's eg: > index = get_opp(VDD1_OPP1); > num = get_max_opp(VDD1); > set_opp(index);
I think we should as well change the naming and use the less confusing naming we are using on OMAP3630/4430. OPPs are now named using the performance delta from the nominal frequency. OPP25, OPP50, OPP80, OPP100, OPP120... Regards, Benoit >Step 3: > Paul suggestion: > VSEL values in opp table should be in terms of voltage > Non TWL IC's need this > >Step4: > Paul suggestion: > VDD1 VDD2 dependencies for different chips > Inter-connect load predictor is absent on omap3 and hence VDD1-vdd2 >dependency > OMAP4 > interconnect loading can be measured from registers > Multi-cores dependency > >Step 5: > Paul suggestion: > Board files adding OPPs, Modifying OPPs > Eg: Pendora passing its own opp -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
