* [PATCH v3 0/2] USB:ehci:fix the no SRBN register problem @ 2021-04-09 3:00 Longfang Liu 2021-04-09 3:00 ` [PATCH v3 1/2] USB:ehci:Add a whitelist for EHCI controllers Longfang Liu 2021-04-09 3:00 ` [PATCH v3 2/2] USB:ehci:fix Kunpeng920 ehci hardware problem Longfang Liu 0 siblings, 2 replies; 4+ messages in thread From: Longfang Liu @ 2021-04-09 3:00 UTC (permalink / raw) To: gregkh, mathias.nyman, stern, liudongdong3 Cc: linux-usb, linux-kernel, liulongfang, kong.kongxinwei, yisen.zhuang (1) Add a whitelist for EHCI devices without SBRN registers. (2) Add Kunpeng920's EHCI device to the whitelist. Changes in v3: - Fix some code style issues. - Update struct name. 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 | 29 +++++++++++++++++++++++++---- 1 file changed, 25 insertions(+), 4 deletions(-) -- 2.8.1 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH v3 1/2] USB:ehci:Add a whitelist for EHCI controllers 2021-04-09 3:00 [PATCH v3 0/2] USB:ehci:fix the no SRBN register problem Longfang Liu @ 2021-04-09 3:00 ` Longfang Liu 2021-04-09 6:46 ` Greg KH 2021-04-09 3:00 ` [PATCH v3 2/2] USB:ehci:fix Kunpeng920 ehci hardware problem Longfang Liu 1 sibling, 1 reply; 4+ messages in thread From: Longfang Liu @ 2021-04-09 3:00 UTC (permalink / raw) To: gregkh, mathias.nyman, stern, liudongdong3 Cc: linux-usb, linux-kernel, liulongfang, kong.kongxinwei, yisen.zhuang Some types of EHCI controllers do not have SBRN registers. By comparing the white list, the operation of reading the SBRN registers is skipped. Subsequent EHCI controller types without SBRN registers can be directly added to the white list. The current patch does not affect the drive function. Signed-off-by: Longfang Liu <liulongfang@huawei.com> --- drivers/usb/host/ehci-pci.c | 27 +++++++++++++++++++++++---- 1 file changed, 23 insertions(+), 4 deletions(-) diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index 3c3820a..f7f3156 100644 --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -47,6 +47,28 @@ static inline bool is_bypassed_id(struct pci_dev *pdev) return !!pci_match_id(bypass_pci_id_table, pdev); } +static const struct ehci_nosbrn { + u16 vendor; + u16 device; +} ehci_nosbrn_table[] = { + /* STMICRO ConneXT has no sbrn register */ + {PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_USB_HOST}, + {}, +}; + +static bool usb_forbid_sbrn_read(struct pci_dev *pdev) +{ + const struct ehci_nosbrn *entry; + + for (entry = ehci_nosbrn_table; entry->vendor; entry++) { + if (pdev->vendor == entry->vendor && + pdev->device == entry->device) + return true; + } + + return false; +} + /* * 0x84 is the offset of in/out threshold register, * and it is the same offset as the register of 'hostpc'. @@ -288,10 +310,7 @@ static int ehci_pci_setup(struct usb_hcd *hcd) } /* Serial Bus Release Number is at PCI 0x60 offset */ - if (pdev->vendor == PCI_VENDOR_ID_STMICRO - && pdev->device == PCI_DEVICE_ID_STMICRO_USB_HOST) - ; /* ConneXT has no sbrn register */ - else + if (!usb_forbid_sbrn_read(pdev)) pci_read_config_byte(pdev, 0x60, &ehci->sbrn); /* Keep this around for a while just in case some EHCI -- 2.8.1 ^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v3 1/2] USB:ehci:Add a whitelist for EHCI controllers 2021-04-09 3:00 ` [PATCH v3 1/2] USB:ehci:Add a whitelist for EHCI controllers Longfang Liu @ 2021-04-09 6:46 ` Greg KH 0 siblings, 0 replies; 4+ messages in thread From: Greg KH @ 2021-04-09 6:46 UTC (permalink / raw) To: Longfang Liu Cc: mathias.nyman, stern, liudongdong3, linux-usb, linux-kernel, kong.kongxinwei, yisen.zhuang On Fri, Apr 09, 2021 at 11:00:14AM +0800, Longfang Liu wrote: > Some types of EHCI controllers do not have SBRN registers. > By comparing the white list, the operation of reading the SBRN > registers is skipped. > > Subsequent EHCI controller types without SBRN registers can be > directly added to the white list. Your subject line still contains "whitelist" when the code does not. Please fix it up to reflect your recent changes. > > The current patch does not affect the drive function. > > Signed-off-by: Longfang Liu <liulongfang@huawei.com> > --- > drivers/usb/host/ehci-pci.c | 27 +++++++++++++++++++++++---- > 1 file changed, 23 insertions(+), 4 deletions(-) > > diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c > index 3c3820a..f7f3156 100644 > --- a/drivers/usb/host/ehci-pci.c > +++ b/drivers/usb/host/ehci-pci.c > @@ -47,6 +47,28 @@ static inline bool is_bypassed_id(struct pci_dev *pdev) > return !!pci_match_id(bypass_pci_id_table, pdev); > } > > +static const struct ehci_nosbrn { > + u16 vendor; > + u16 device; > +} ehci_nosbrn_table[] = { > + /* STMICRO ConneXT has no sbrn register */ > + {PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_USB_HOST}, > + {}, > +}; > + > +static bool usb_forbid_sbrn_read(struct pci_dev *pdev) > +{ > + const struct ehci_nosbrn *entry; > + > + for (entry = ehci_nosbrn_table; entry->vendor; entry++) { > + if (pdev->vendor == entry->vendor && > + pdev->device == entry->device) > + return true; There is a PCI-match-device function somewhere, right? But as Alan said, why is all of this needed? You only have 2 devices you are testing for, we have if statements that are MUCH bigger than that for simple things like this. And the odds that a new device will be added to this list in the future is _VERY_ low given that I would think that no one is making new EHCI controllers anymore. So just make this one patch, and add your device id to that, like you did in the first set of patches. thanks, greg k-h ^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH v3 2/2] USB:ehci:fix Kunpeng920 ehci hardware problem 2021-04-09 3:00 [PATCH v3 0/2] USB:ehci:fix the no SRBN register problem Longfang Liu 2021-04-09 3:00 ` [PATCH v3 1/2] USB:ehci:Add a whitelist for EHCI controllers Longfang Liu @ 2021-04-09 3:00 ` Longfang Liu 1 sibling, 0 replies; 4+ messages in thread From: Longfang Liu @ 2021-04-09 3:00 UTC (permalink / raw) To: gregkh, mathias.nyman, stern, liudongdong3 Cc: linux-usb, linux-kernel, liulongfang, kong.kongxinwei, yisen.zhuang Kunpeng920's EHCI controller does not have SBRN register. Reading the SBRN register when the controller driver is initialized will get 0. When rebooting the EHCI driver, ehci_shutdown() will be called. if the sbrn flag is 0, ehci_shutdown() will return directly. The sbrn flag being 0 will cause the EHCI interrupt signal to not be turned off after reboot. this interrupt that is not closed will cause an exception to the device sharing the interrupt. Therefore, the EHCI controller of kunpeng920 needs to be added to the whitelist without SBRN register. Signed-off-by: Longfang Liu <liulongfang@huawei.com> --- drivers/usb/host/ehci-pci.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index f7f3156..3690e62 100644 --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -53,6 +53,8 @@ static const struct ehci_nosbrn { } ehci_nosbrn_table[] = { /* STMICRO ConneXT has no sbrn register */ {PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_USB_HOST}, + /* HUAWEI Kunpeng920 HiSilicon USB EHCI has no sbrn register */ + {PCI_VENDOR_ID_HUAWEI, 0xa239}, {}, }; -- 2.8.1 ^ permalink raw reply related [flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-04-09 6:46 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-04-09 3:00 [PATCH v3 0/2] USB:ehci:fix the no SRBN register problem Longfang Liu 2021-04-09 3:00 ` [PATCH v3 1/2] USB:ehci:Add a whitelist for EHCI controllers Longfang Liu 2021-04-09 6:46 ` Greg KH 2021-04-09 3:00 ` [PATCH v3 2/2] USB:ehci:fix Kunpeng920 ehci hardware problem Longfang Liu
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