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PCI: dwc: Don't wait for link up if driver can detect Link Up event

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If the driver can detect the Link Up event and enumerate downstream devices
at that time, we need not wait here.

Skip waiting for link to come up if the driver supports 'use_linkup_irq'.

Link: https://lore.kernel.org/r/20241123-remove_wait2-v5-1-b5f9e6b794c2@quicinc.com
Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
[bhelgaas: wrap comment, update commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
This commit is contained in:
Krishna chaitanya chundru
2024-11-23 00:39:59 +05:30
committed by Bjorn Helgaas
parent 574913f9e1
commit 8d3bf19f1b
2 changed files with 9 additions and 2 deletions
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10
drivers/pci/controller/dwc/pcie-designware-host.c
View File

@@ -530,8 +530,14 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
goto err_remove_edma;
}
/* Ignore errors, the link may come up later */
dw_pcie_wait_for_link(pci);
/*
* Note: Skip the link up delay only when a Link Up IRQ is present.
* If there is no Link Up IRQ, we should not bypass the delay
* because that would require users to manually rescan for devices.
*/
if (!pp->use_linkup_irq)
/* Ignore errors, the link may come up later */
dw_pcie_wait_for_link(pci);
bridge->sysdata = pp;

1
drivers/pci/controller/dwc/pcie-designware.h
View File

@@ -379,6 +379,7 @@ struct dw_pcie_rp {
bool use_atu_msg;
int msg_atu_index;
struct resource *msg_res;
bool use_linkup_irq;
};
struct dw_pcie_ep_ops {