On Wed, 2016-05-04 at 15:37 +0100, Bryan O'Donoghue wrote: > On Wed, 2016-05-04 at 14:20 +0300, Andy Shevchenko wrote: > > > > On Wed, 2016-05-04 at 12:01 +0100, Bryan O'Donoghue wrote: > > > > > > On Wed, 2016-05-04 at 13:03 +0300, Andy Shevchenko wrote: > > > > > > > > > > > > On Wed, May 4, 2016 at 12:51 PM, Bryan O'Donoghue > > > > <pure.logic@xxxxxxxxxxxxxxxxx> wrote: > > > > > > > > > > > > > > > The default may be set to SERIAL_8250 but, without the QRK > > > > > specific > > > > > entry in 8250_pci.c you won't get console output. > > That's, by the way, not true. > Since when ? We don't have an I/O bar so mapping the MMIO bar @ the > right register width is required. Since this series. 8250_lpss will be enabled as long as user doesn't enable EXPERT and _explicitly_ _disables_ it. Same is applied to SERIAL_8250_PCI. If you look at the default kernel configurations such as i386_default you don't find that option there. Btw, I have to clean up such in my branches. > > > > > > So if you are going to remove the QRK entry from 8250_pci.c > > > > > and > > > > > stuff > > > > > it into 8250_lpss.c then 8250_lpss needs to be selected by > > > > > CONFIG_SERIAL_8250_PCI. > > > > Why?! > > > > > > > > Now it should be enough to have SERIAL_8250 set to non-n to have > > > > 8250_lpss compiled. > > > > Can you check it? > > > I'm sure that's true. > > > > > > My point to you is that - its a highly non-intuitive thing to do > > > on > > > a > > > reading of the datasheet for this part. > > > > > > LPSS is, ostensibly at least, for passing processor resources via > > > APCI. > > > > > > If you look at a QRK datasheet it says "enumerate all this stuff > > > via > > > PCI" - there's not a single mention of LPSS. Its reasonable, > > > correct > > > and currently required for QRK to set CONFIG_8250_PCI. > > User has no such item even visible until enable CONFIG_EXPERT. > > > > Heikki sent an answer to you (and to the list, but by some reason > > it's > > not yet there) an hour ago. > > > > > > > > > > > To move away from a valid/standard PCI probe routine into a new > > > special > > > LPSS/PCI shim (which the hardware doesn't actually mandate) I do > > > think > > > you should to setup the dependency CONFIG_8250_PCI => > > > CONFIG_8250_LPSS. > > No, this is what we try avoiding, thus it will not happen. > > > > If user selects CONFIG_SERIAL_8250_PCI, the CONFIG_SERIAL_8250_LPSS > > will > > be selected as well since it has same dependencies. > Hmm. I think what you mean to say is that a user (expert or not) > *would* select SERIAL_8250_LPSS since (at least in your branch > 09c4268121a39eb3973823dd9225b650df726f67) both options may be > individually selected/deselected. So, currently it works in such way that user enables SERIAL_8250 and _dependencies_, which are PCI (for SERIAL_8250_PCI) or PCI && X86 (for SERIAL_8250_LPSS) and drivers will be built automatically on the same level (m or y) as SERIAL_8250. Nevertheless, user may _disable_ them if needed using EXPERT option. -- Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Intel Finland Oy -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
