On 26.02.2021 13:18, Kai-Heng Feng wrote: > On Fri, Feb 26, 2021 at 8:10 PM Heiner Kallweit <hkallweit1@xxxxxxxxx> wrote: >> >> On 26.02.2021 08:12, Kalle Valo wrote: >>> Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> writes: >>> >>>> Now we have a generic D3 shutdown quirk, so convert the original >>>> approach to a PCI quirk. >>>> >>>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> >>>> --- >>>> drivers/net/wireless/realtek/rtw88/pci.c | 2 -- >>>> drivers/pci/quirks.c | 6 ++++++ >>>> 2 files changed, 6 insertions(+), 2 deletions(-) >>> >>> It would have been nice to CC linux-wireless also on patches 1-2. I only >>> saw patch 3 and had to search the rest of patches from lkml. >>> >>> I assume this goes via the PCI tree so: >>> >>> Acked-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx> >>> >> >> To me it looks odd to (mis-)use the quirk mechanism to set a device >> to D3cold on shutdown. As I see it the quirk mechanism is used to work >> around certain device misbehavior. And setting a device to a D3 >> state on shutdown is a normal activity, and the shutdown() callback >> seems to be a good place for it. >> I miss an explanation what the actual benefit of the change is. > > To make putting device to D3 more generic, as there are more than one > device need the quirk. > > Here's the discussion: > https://lore.kernel.org/linux-usb/00de6927-3fa6-a9a3-2d65-2b4d4e8f0012@xxxxxxxxxxxxxxx/ > Thanks for the link. For the AMD USB use case I don't have a strong opinion, what's considered the better option may be a question of personal taste. For rtw88 however I'd still consider it over-engineering to replace a simple call to pci_set_power_state() with a PCI quirk. I may be biased here because I find it sometimes bothering if I want to look up how a device is handled and in addition to checking the respective driver I also have to grep through quirks.c whether there's any special handling. > Kai-Heng > Heiner
