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Thus, wait for the PERST# level-triggered interrupt to start link training at the end of initialization and cleanup the stm32_pcie_[start stop]_link functions. Signed-off-by: Christian Bruel --- drivers/pci/controller/dwc/pcie-stm32-ep.c | 38 ++++++------------------------ 1 file changed, 7 insertions(+), 31 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-stm32-ep.c b/drivers/pci/controller/dwc/pcie-stm32-ep.c index 3400c7cd2d88a279c49ef36a99fc7537c381c384..d0654bb43759bb8d0f0d7badbf7bdae839241fcf 100644 --- a/drivers/pci/controller/dwc/pcie-stm32-ep.c +++ b/drivers/pci/controller/dwc/pcie-stm32-ep.c @@ -37,36 +37,9 @@ static void stm32_pcie_ep_init(struct dw_pcie_ep *ep) dw_pcie_ep_reset_bar(pci, bar); } -static int stm32_pcie_enable_link(struct dw_pcie *pci) -{ - struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); - - regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR, - STM32MP25_PCIECR_LTSSM_EN, - STM32MP25_PCIECR_LTSSM_EN); - - return dw_pcie_wait_for_link(pci); -} - -static void stm32_pcie_disable_link(struct dw_pcie *pci) -{ - struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); - - regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR, STM32MP25_PCIECR_LTSSM_EN, 0); -} - static int stm32_pcie_start_link(struct dw_pcie *pci) { struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); - int ret; - - dev_dbg(pci->dev, "Enable link\n"); - - ret = stm32_pcie_enable_link(pci); - if (ret) { - dev_err(pci->dev, "PCIe cannot establish link: %d\n", ret); - return ret; - } enable_irq(stm32_pcie->perst_irq); @@ -77,11 +50,7 @@ static void stm32_pcie_stop_link(struct dw_pcie *pci) { struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); - dev_dbg(pci->dev, "Disable link\n"); - disable_irq(stm32_pcie->perst_irq); - - stm32_pcie_disable_link(pci); } static int stm32_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no, @@ -152,6 +121,8 @@ static void stm32_pcie_perst_assert(struct dw_pcie *pci) dev_dbg(dev, "PERST asserted by host\n"); + regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR, STM32MP25_PCIECR_LTSSM_EN, 0); + pci_epc_deinit_notify(ep->epc); stm32_pcie_disable_resources(stm32_pcie); @@ -192,6 +163,11 @@ static void stm32_pcie_perst_deassert(struct dw_pcie *pci) pci_epc_init_notify(ep->epc); + /* Enable link training */ + regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR, + STM32MP25_PCIECR_LTSSM_EN, + STM32MP25_PCIECR_LTSSM_EN); + return; err_disable_resources: --- base-commit: 31115ecec74fe5c679a149d7037009f26b3aa8a9 change-id: 20251113-perst_ep-0b57b9679cf9 Best regards, -- Christian Bruel