On Fri, Apr 09, 2021 at 10:42:35AM +0800, liulongfang wrote: > On 2021/4/8 22:53, Alan Stern wrote: > > On Thu, Apr 08, 2021 at 09:49:18PM +0800, Longfang Liu wrote: > >> (1) Add a whitelist for EHCI devices without SBRN registers. > >> (2) Add Kunpeng920's EHCI device to the whitelist. > >> > >> Changes in v2: > >> - Fix some code style issues. > >> - Update function name. > >> > >> Longfang Liu (2): > >> USB:ehci:Add a whitelist for EHCI controllers > >> USB:ehci:fix Kunpeng920 ehci hardware problem > >> > >> drivers/usb/host/ehci-pci.c | 30 ++++++++++++++++++++++++++---- > >> 1 file changed, 26 insertions(+), 4 deletions(-) > > > > I don't think we need a whole list, along with an associated lookup > > routine, when there are only two entries. The total amount of code will > > be smaller if you just add a check for the Kunpeng920 controller to > > the existing check for the STMICRO controller. > > > > Alan Stern > > . > > > Now there are two EHCI controllers that do not have SBRN registers, > and there may be more in the future. This list is added for subsequent > compatibility if there are such controllers, instead of a series of if-else.
Why would more people create new EHCI controllers these days with the cheapness of USB 3 cores? Anyway, let us worry about that if this list gets "too long", a simple if statement is fine for now. thanks, greg k-h
