| Message ID | 20240403144508.489835-1-rick.wertenbroek@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Krzysztof Wilczyński |
| Headers | show |
| Series | PCI: rockchip-ep: Remove wrong mask on subsys_vendor_id | expand |
On Wed, Apr 3, 2024 at 4:45 PM Rick Wertenbroek <rick.wertenbroek@gmail.com> wrote: > > Remove wrong mask on subsys_vendor_id. Both the Vendor ID and Subsystem > Vendor ID are u16 variables and are written to a u32 register of the > controller. The Subsystem Vendor ID was always 0 because the u16 value > was masked incorrectly with GENMASK(31,16) resulting in all lower 16 > bits being set to 0 prior to the shift. > > Remove both masks as they are unnecessary and set the register correctly > i.e., the lower 16-bits are the Vendor ID and the upper 16-bits are the > Subsystem Vendor ID. > > This is documented in the RK3399 TRM section 17.6.7.1.17 > > Fixes: cf590b078391 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller") > Signed-off-by: Rick Wertenbroek <rick.wertenbroek@gmail.com> > Cc: stable@vger.kernel.org > --- > drivers/pci/controller/pcie-rockchip-ep.c | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-) > > diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c > index c9046e97a1d2..37d4bcb8bd5b 100644 > --- a/drivers/pci/controller/pcie-rockchip-ep.c > +++ b/drivers/pci/controller/pcie-rockchip-ep.c > @@ -98,10 +98,9 @@ static int rockchip_pcie_ep_write_header(struct pci_epc *epc, u8 fn, u8 vfn, > > /* All functions share the same vendor ID with function 0 */ > if (fn == 0) { > - u32 vid_regs = (hdr->vendorid & GENMASK(15, 0)) | > - (hdr->subsys_vendor_id & GENMASK(31, 16)) << 16; > - > - rockchip_pcie_write(rockchip, vid_regs, > + rockchip_pcie_write(rockchip, > + hdr->vendorid | > + hdr->subsys_vendor_id << 16, > PCIE_CORE_CONFIG_VENDOR); > } > > -- > 2.25.1 > This patch was tested on linux next-20240403. The PCI endpoint test function was used and an arbitrary value e.g., 0x1234 was written to /sys/kernel/config/pci_ep/functions/pci_epf_test/pci_epf_test.0/subsys_vendor_id This value was then verified with lspci -x / lspci -v on a host computer acting as PCI root complex. Cheers, Rick
diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c index c9046e97a1d2..37d4bcb8bd5b 100644 --- a/drivers/pci/controller/pcie-rockchip-ep.c +++ b/drivers/pci/controller/pcie-rockchip-ep.c @@ -98,10 +98,9 @@ static int rockchip_pcie_ep_write_header(struct pci_epc *epc, u8 fn, u8 vfn, /* All functions share the same vendor ID with function 0 */ if (fn == 0) { - u32 vid_regs = (hdr->vendorid & GENMASK(15, 0)) | - (hdr->subsys_vendor_id & GENMASK(31, 16)) << 16; - - rockchip_pcie_write(rockchip, vid_regs, + rockchip_pcie_write(rockchip, + hdr->vendorid | + hdr->subsys_vendor_id << 16, PCIE_CORE_CONFIG_VENDOR); }
Remove wrong mask on subsys_vendor_id. Both the Vendor ID and Subsystem Vendor ID are u16 variables and are written to a u32 register of the controller. The Subsystem Vendor ID was always 0 because the u16 value was masked incorrectly with GENMASK(31,16) resulting in all lower 16 bits being set to 0 prior to the shift. Remove both masks as they are unnecessary and set the register correctly i.e., the lower 16-bits are the Vendor ID and the upper 16-bits are the Subsystem Vendor ID. This is documented in the RK3399 TRM section 17.6.7.1.17 Fixes: cf590b078391 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller") Signed-off-by: Rick Wertenbroek <rick.wertenbroek@gmail.com> Cc: stable@vger.kernel.org --- drivers/pci/controller/pcie-rockchip-ep.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)