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PCI: dwc: ep: Introduce dw_pcie_ep_cleanup() API for drivers supporting PERST#

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For DWC glue drivers supporting PERST# (currently Qcom and Tegra194), some
of the DWC resources like eDMA should be cleaned up during the PERST#
assert time.

So let's introduce a dw_pcie_ep_cleanup() API that could be called by these
drivers to cleanup the DWC specific resources. Currently, it just removes
eDMA.

Closes: https://lore.kernel.org/linux-pci/ZWYmX8Y%2F7Q9WMxES@x1-carbon
Link: https://lore.kernel.org/linux-pci/20240327-pci-dbi-rework-v12-5-082625472414@linaro.org
Reported-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
This commit is contained in:
Manivannan Sadhasivam 2024-03-27 14:43:34 +05:30 committed by Krzysztof Wilczyński
parent c8682a3314
commit 570d7715ee
No known key found for this signature in database
GPG Key ID: 7C64768D3DE334E7
4 changed files with 25 additions and 2 deletions
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19
drivers/pci/controller/dwc/pcie-designware-ep.c
View File

@ -619,6 +619,22 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
return 0;
}
/**
* dw_pcie_ep_cleanup - Cleanup DWC EP resources after fundamental reset
* @ep: DWC EP device
*
* Cleans up the DWC EP specific resources like eDMA etc... after fundamental
* reset like PERST#. Note that this API is only applicable for drivers
* supporting PERST# or any other methods of fundamental reset.
*/
void dw_pcie_ep_cleanup(struct dw_pcie_ep *ep)
{
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
dw_pcie_edma_remove(pci);
}
EXPORT_SYMBOL_GPL(dw_pcie_ep_cleanup);
/**
* dw_pcie_ep_deinit - Deinitialize the endpoint device
* @ep: DWC EP device
@ -628,10 +644,9 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
*/
void dw_pcie_ep_deinit(struct dw_pcie_ep *ep)
{
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
struct pci_epc *epc = ep->epc;
dw_pcie_edma_remove(pci);
dw_pcie_ep_cleanup(ep);
pci_epc_mem_free_addr(epc, ep->msi_mem_phys, ep->msi_mem,
epc->mem->window.page_size);

5
drivers/pci/controller/dwc/pcie-designware.h
View File

@ -672,6 +672,7 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep);
int dw_pcie_ep_init_complete(struct dw_pcie_ep *ep);
void dw_pcie_ep_init_notify(struct dw_pcie_ep *ep);
void dw_pcie_ep_deinit(struct dw_pcie_ep *ep);
void dw_pcie_ep_cleanup(struct dw_pcie_ep *ep);
int dw_pcie_ep_raise_intx_irq(struct dw_pcie_ep *ep, u8 func_no);
int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
u8 interrupt_num);
@ -705,6 +706,10 @@ static inline void dw_pcie_ep_deinit(struct dw_pcie_ep *ep)
{
}
static inline void dw_pcie_ep_cleanup(struct dw_pcie_ep *ep)
{
}
static inline int dw_pcie_ep_raise_intx_irq(struct dw_pcie_ep *ep, u8 func_no)
{
return 0;

1
drivers/pci/controller/dwc/pcie-qcom-ep.c
View File

@ -507,6 +507,7 @@ static void qcom_pcie_perst_assert(struct dw_pcie *pci)
return;
}
dw_pcie_ep_cleanup(&pci->ep);
qcom_pcie_disable_resources(pcie_ep);
pcie_ep->link_status = QCOM_PCIE_EP_LINK_DISABLED;
}

2
drivers/pci/controller/dwc/pcie-tegra194.c
View File

@ -1715,6 +1715,8 @@ static void pex_ep_event_pex_rst_assert(struct tegra_pcie_dw *pcie)
if (ret)
dev_err(pcie->dev, "Failed to go Detect state: %d\n", ret);
dw_pcie_ep_cleanup(&pcie->pci.ep);
reset_control_assert(pcie->core_rst);
tegra_pcie_disable_phy(pcie);