[PATCH v2 1/9] PCI: rockchip: Remove writes to unused registers

From: Rick Wertenbroek
Date: Tue Feb 14 2023 - 09:10:48 EST


Remove write accesses to registers that are marked "unused" (and
therefore read-only) in the technical reference manual (TRM)
(see RK3399 TRM 17.6.8.1)

Signed-off-by: Rick Wertenbroek <rick.wertenbroek@xxxxxxxxx>
---
drivers/pci/controller/pcie-rockchip-ep.c | 10 ----------
1 file changed, 10 deletions(-)

diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c
index d1a200b93..d5c477020 100644
--- a/drivers/pci/controller/pcie-rockchip-ep.c
+++ b/drivers/pci/controller/pcie-rockchip-ep.c
@@ -61,10 +61,6 @@ static void rockchip_pcie_clear_ep_ob_atu(struct rockchip_pcie *rockchip,
ROCKCHIP_PCIE_AT_OB_REGION_DESC0(region));
rockchip_pcie_write(rockchip, 0,
ROCKCHIP_PCIE_AT_OB_REGION_DESC1(region));
- rockchip_pcie_write(rockchip, 0,
- ROCKCHIP_PCIE_AT_OB_REGION_CPU_ADDR0(region));
- rockchip_pcie_write(rockchip, 0,
- ROCKCHIP_PCIE_AT_OB_REGION_CPU_ADDR1(region));
}

static void rockchip_pcie_prog_ep_ob_atu(struct rockchip_pcie *rockchip, u8 fn,
@@ -114,12 +110,6 @@ static void rockchip_pcie_prog_ep_ob_atu(struct rockchip_pcie *rockchip, u8 fn,
PCIE_CORE_OB_REGION_ADDR0_LO_ADDR);
addr1 = upper_32_bits(cpu_addr);
}
-
- /* CPU bus address region */
- rockchip_pcie_write(rockchip, addr0,
- ROCKCHIP_PCIE_AT_OB_REGION_CPU_ADDR0(r));
- rockchip_pcie_write(rockchip, addr1,
- ROCKCHIP_PCIE_AT_OB_REGION_CPU_ADDR1(r));
}

static int rockchip_pcie_ep_write_header(struct pci_epc *epc, u8 fn, u8 vfn,
--
2.25.1