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PCI: qcom: Implement .assert_perst()

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Add support for assert_perst() for switches like TC9563, which require
configuration before the PCIe link is established. Such devices use this
function op to assert PERST# before configuring the device and once the
configuration is done they de-assert PERST#.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://patch.msgid.link/20251101-tc9563-v9-5-de3429f7787a@oss.qualcomm.com
This commit is contained in:
Krishna Chaitanya Chundru
2025-11-01 09:29:36 +05:30
committed by Bjorn Helgaas
parent 3445d38207
commit 8bf3ad7675
1 changed files with 13 additions and 0 deletions
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13
drivers/pci/controller/dwc/pcie-qcom.c
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@@ -696,6 +696,18 @@ static int qcom_pcie_post_init_1_0_0(struct qcom_pcie *pcie)
return 0;
}
static int qcom_pcie_assert_perst(struct dw_pcie *pci, bool assert)
{
struct qcom_pcie *pcie = to_qcom_pcie(pci);
if (assert)
qcom_ep_reset_assert(pcie);
else
qcom_ep_reset_deassert(pcie);
return 0;
}
static void qcom_pcie_2_3_2_ltssm_enable(struct qcom_pcie *pcie)
{
u32 val;
@@ -1516,6 +1528,7 @@ static const struct qcom_pcie_cfg cfg_fw_managed = {
static const struct dw_pcie_ops dw_pcie_ops = {
.link_up = qcom_pcie_link_up,
.start_link = qcom_pcie_start_link,
.assert_perst = qcom_pcie_assert_perst,
};
static int qcom_pcie_icc_init(struct qcom_pcie *pcie)