I'm working my way through this today. Stay tuned... > -----Original Message----- > From: Ken Milmore [mailto:ken at kenm.demon.co.uk] > Sent: Sunday, July 06, 2008 10:49 AM > To: Hans de Goede > Cc: George Joseph; lm-sensors at lm-sensors.org > Subject: Re: patch: asc7621 driver bug fixes > > Hans / George, > > Although things are shaping up nicely, I think there is still quite a bit left to do to completely > review the driver. > > The aSC7621 appears to have a lot of bells and whistles for closed loop temperature control etc. and > George has tried to support as much of this feature set as possible. Unfortunately that means there's > quite a lot to review - I haven't really looked at PWM control yet. > > In any case, a few more things have come to light: > > 1. In my last posting I wasn't completely sure if my "patch #2" was a good idea or not. Having > looked at the Andigilog specs, I have become convinced that it will be necessary after all. The main > problem is with the two-byte registers. To get the read-locking to work, the MSB and LSB must be read > together, one after the other (although it is unimportant which one is read first!). So it is > necessary to sequence the reads so that the two-byte registers are handled correctly. My patch will > correct this problem, although as I have said, I think that other, cleaner solutions may be possible. > > 2. The voltage scaling used in the driver appears to be slightly off from the nominal values given in > the spec. To get the scaling exactly right, it is necessary to use a "muldiv" scheme which I've > included in the patch (see below). > > 3. I fixed a problem in store_fan16() whereby it wasn't possible to set the minimum fan RPM to zero. > The aSC7621 explicitly allows this, and of course it is useful to prevent spurious alarms for fans > which are missing or stopped. > > The attached patch rolls up all my changes so far. It applies against George's original patch of 29 > May. It includes all the bug fixes from my last submission, the voltage scaling and fan fixes > mentioned above and some tidying up of the high and low priority register lists. > > > To sum up, by now I'm very happy with the following functions of the driver: > > * Reading of voltages, fans and temperatures. > > * Setting of alarm limits and display of alarms. > > The following areas still need to be reviewed and perhaps improved: > > * PWM control. A few scary lookup tables in the code that I don't understand yet! > > * The miscellaneous configuration knobs (Input selection, PECI config etc). I haven't tested these. > > * I think there is space for improvement in how the low-priority register list is handled. A full > minute between updates is probably too long. > > I hope this is of some use. I will try to look at reviewing the remaining parts of the driver as time > allows. > > George, I'd appreciate your feedback on my patches so far; I realise you might want to approach some > of these changes differently to the way I've done them. > > Best wishes, > > Ken. > > > Hans de Goede wrote: > > Ken Milmore wrote: > >> George, > >> > >> Here are some suggested bug fixes for the asc7621 driver source which > >> you posted to lm_sensors on 29 May. > >> (http://lists.lm-sensors.org/pipermail/lm-sensors/2008-May/023257.htm > >> l) > >> > > > > Thanks for doing this, I promised George to review this driver, but > > sofar haven't gotten around to doing this. Any chance you could do a > > complete review of it (or have you already done so, it sure looks that > > way :) > > > > George, I assume you will post a new version of your patch soon with > > these fixes incorperated? > > > > Regards, > > > > Hans > > >
