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PCI: dw-rockchip: Add rockchip_pcie_get_ltssm() helper

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Add a rockchip_pcie_ltssm() helper function that reads the LTSSM status.

This helper will be used in additional places in follow-up commits.

Link: https://lore.kernel.org/linux-pci/20240607-rockchip-pcie-ep-v1-v5-8-0a042d6b0049@kernel.org
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
This commit is contained in:
Niklas Cassel 2024-06-07 13:14:28 +02:00 committed by Bjorn Helgaas
parent 2baa5fc389
commit d8b864c95d
1 changed files with 6 additions and 1 deletions
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7
drivers/pci/controller/dwc/pcie-dw-rockchip.c
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@ -143,6 +143,11 @@ static int rockchip_pcie_init_irq_domain(struct rockchip_pcie *rockchip)
return 0;
}
static u32 rockchip_pcie_get_ltssm(struct rockchip_pcie *rockchip)
{
return rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_LTSSM_STATUS);
}
static void rockchip_pcie_enable_ltssm(struct rockchip_pcie *rockchip)
{
rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_ENABLE_LTSSM,
@ -152,7 +157,7 @@ static void rockchip_pcie_enable_ltssm(struct rockchip_pcie *rockchip)
static int rockchip_pcie_link_up(struct dw_pcie *pci)
{
struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
u32 val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_LTSSM_STATUS);
u32 val = rockchip_pcie_get_ltssm(rockchip);
if ((val & PCIE_LINKUP) == PCIE_LINKUP &&
(val & PCIE_LTSSM_STATUS_MASK) == PCIE_L0S_ENTRY)