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PCI: Configure RC MPS to 128 for Realtek 8168 attach

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Change is to configure QC RC MPS 128 bytes as 8168 device only supports
128 bytes. Without this quirk, since RC is using pcie_bus_perf flag
MPS is configured to 256 bytes, when EP MRRS is changed to 4096 bytes
RC is responding with packets of 256 bytes causing functionality break.

Since pcie_bus_perf is used for many products, this change provies a
provision to configure RC to 128 bytes for realtek 8168 attach alone.

Change-Id: I4a82293e4f71bf188d4f0f2be8fa194c5ab007c2
Signed-off-by: Subramanian Ananthanarayanan <quic_skananth@quicinc.com>
This commit is contained in:
Subramanian Ananthanarayanan 2023-07-25 03:32:15 -07:00
commit eaecb54706
1 changed files with 14 additions and 0 deletions
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14
drivers/pci/quirks.c
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@ -2415,6 +2415,20 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_CK804_PCIE,
DECLARE_PCI_FIXUP_RESUME_EARLY(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_CK804_PCIE,
quirk_nvidia_ck804_pcie_aer_ext_cap);
/*
* Quirk to limit QCOM RC MPS to 128 in case of Realtek 8168
* attaches.
*/
static void quirk_realtek_rc_mpss_limit(struct pci_dev *pdev)
{
struct pci_dev *root_port = pcie_find_root_port(pdev);
if (root_port->vendor == PCI_VENDOR_ID_QCOM)
pcie_set_mps(root_port, 128);
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_REALTEK, 0x8168,
quirk_realtek_rc_mpss_limit);
static void quirk_via_cx700_pci_parking_caching(struct pci_dev *dev)
{
/*