[PATCH] PCI: rockchip-ep: Remove wrong mask on subsys_vendor_id

[Rick Wertenbroek <rick.wertenbroek@gmail.com>]

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