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PCI: tegra194: Enable support for 256 Byte payload

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Set 256 byte payload as the default in the Device Control Register to allow
the PCIe subsystem to enable 256 byte Max Payload Size when a capable link
partner is connected.

Link: https://lore.kernel.org/r/20220721142052.25971-13-vidyas@nvidia.com
Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Vidya Sagar 2022-07-21 19:50:48 +05:30 committed by Bjorn Helgaas
parent 6c12e3e139
commit 4fb8e46c1b
1 changed files with 13 additions and 0 deletions
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13
drivers/pci/controller/dwc/pcie-tegra194.c
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@ -839,6 +839,7 @@ static int tegra_pcie_dw_host_init(struct pcie_port *pp)
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
u32 val;
u16 val_16;
pp->bridge->ops = &tegra_pci_ops;
@ -846,6 +847,11 @@ static int tegra_pcie_dw_host_init(struct pcie_port *pp)
pcie->pcie_cap_base = dw_pcie_find_capability(&pcie->pci,
PCI_CAP_ID_EXP);
val_16 = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_DEVCTL);
val_16 &= ~PCI_EXP_DEVCTL_PAYLOAD;
val_16 |= PCI_EXP_DEVCTL_PAYLOAD_256B;
dw_pcie_writew_dbi(pci, pcie->pcie_cap_base + PCI_EXP_DEVCTL, val_16);
val = dw_pcie_readl_dbi(pci, PCI_IO_BASE);
val &= ~(IO_BASE_IO_DECODE | IO_BASE_IO_DECODE_BIT8);
dw_pcie_writel_dbi(pci, PCI_IO_BASE, val);
@ -1632,6 +1638,7 @@ static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie)
struct device *dev = pcie->dev;
u32 val;
int ret;
u16 val_16;
if (pcie->ep_state == EP_STATE_ENABLED)
return;
@ -1749,6 +1756,12 @@ static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie)
pcie->pcie_cap_base = dw_pcie_find_capability(&pcie->pci,
PCI_CAP_ID_EXP);
val_16 = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_DEVCTL);
val_16 &= ~PCI_EXP_DEVCTL_PAYLOAD;
val_16 |= PCI_EXP_DEVCTL_PAYLOAD_256B;
dw_pcie_writew_dbi(pci, pcie->pcie_cap_base + PCI_EXP_DEVCTL, val_16);
clk_set_rate(pcie->core_clk, GEN4_CORE_CLK_FREQ);
val = (ep->msi_mem_phys & MSIX_ADDR_MATCH_LOW_OFF_MASK);