On Tue, 19 Oct 2010 22:24:05 +0100 (BST) Daniel Drake <d...@laptop.org> wrote:
> These parameters need to be configurable based on the host system. > They can now be communicated through the s_config call. > > The old CONFIG_OLPC_XO_1 selector was not correct; this kind of > arrangement wouldn't allow for a universal kernel that would work on both > laptops. > > Certain parts of the probe routine had to be moved later (into s_config), > because we can't do any I/O until we know which I/O method has been > selected through this mechanism. OK, I've had a look at this. I'm OK with it to go in as it is, but, for the record, I'll note that I would have done it a bit differently. There are three different things (minimum size, clock speed, I/O method) being dealt with here; it might have been nice to separate them out. Yes, they're all part of the s_config() call, I know... I dislike deferring the probe of the sensor, it strikes me as something that could create timing problems. Maybe I'm overly nervous about this and it's not really a problem. My biggest issue, though, is this: SMBUS I/O is actually never the right thing to do with the ov7670. This isn't something I knew when I wrote the Cafe driver (suffice to say the ov7670 seems to hold more than its share of mysteries and surprises). What I *should* have done - and what should be done now - is to forget the built-in Cafe SMBUS mode and do a straight bit-banging i2c driver. As I recall, the Cafe controller does provide that level of access for those who want it. That's a bigger fix, of course. I have it on my list, but my list is, well, you know. So I won't try to hold up this patch, which works around my initial screwup, on the promise of a proper fix one of these days. Sometime when I have a few hours I will take a crack at it, though. Thanks, jon -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
