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cnss2: Wait for PCIe switch ready

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If WLAN is attached to PCIe switch, it's possible that PCIe switch is
not probed when cnss_probe call PCIe enumeration. This case can lead to
cnss_probe failure, it prenventing the cld driver ko loading. From user
layer can see WLAN interface is not up.

To fix this issue, cnss_probe call PCIe enumeration until PCIe switch is
probed.

Change-Id: I302f23cc2af6c738e4c18c7eb6a09685a49a643c
CRs-Fixed: 3863866
This commit is contained in:
Jiani Liu 2024-07-24 19:35:05 +08:00 committed by Ravindra Konda
parent 88241e0fc8
commit a9b214d91e
1 changed files with 24 additions and 1 deletions
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25
cnss2/pci_qcom.c
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@ -34,9 +34,32 @@ static struct cnss_msi_config msi_config_one_msi = {
};
#endif
#define ENUM_RETRY_MAX_TIMES 8
#define ENUM_RETRY_DELAY_MS 500
int _cnss_pci_enumerate(struct cnss_plat_data *plat_priv, u32 rc_num)
{
return msm_pcie_enumerate(rc_num);
u32 retry = 0;
int ret;
if (plat_priv->pcie_switch_type == PCIE_SWITCH_NTN3) {
while (retry++ < ENUM_RETRY_MAX_TIMES) {
ret = msm_pcie_enumerate(rc_num);
/* For PCIe switch platform, cnss_probe may called
* before PCIe switch hardware ready, wait for
* msm_pcie_enumerate complete.
*/
if (ret == -EPROBE_DEFER) {
cnss_pr_dbg("PCIe RC%d not ready, retry:%dth\n",
rc_num, retry);
msleep(ENUM_RETRY_DELAY_MS);
}
}
} else {
return msm_pcie_enumerate(rc_num);
}
return ret;
}
int cnss_pci_assert_perst(struct cnss_pci_data *pci_priv)