diff mbox series

[V3,13/21] PCI: tegra194: Enable hardware hot reset mode in Endpoint

Message ID 20221013183854.21087-14-vidyas@nvidia.com (mailing list archive)
State New, archived
Delegated to: Lorenzo Pieralisi
Headers show
Series Enhancements to pcie-tegra194 driver | expand

Commit Message

Vidya Sagar Oct. 13, 2022, 6:38 p.m. UTC 
When PCIe link goes down, hardware can retrain the link and try to link up.
To enable this feature, program the APPL_CTRL register with hardware hot
reset with immediate LTSSM enable mode.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
---
V3:
* This is a new patch in this series

 drivers/pci/controller/dwc/pcie-tegra194.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index a1c3481585c9..78ee0f713e71 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1913,6 +1913,8 @@  static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie)
 	val = appl_readl(pcie, APPL_CTRL);
 	val |= APPL_CTRL_SYS_PRE_DET_STATE;
 	val |= APPL_CTRL_HW_HOT_RST_EN;
+	val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK << APPL_CTRL_HW_HOT_RST_MODE_SHIFT);
+	val |= (APPL_CTRL_HW_HOT_RST_MODE_IMDT_RST_LTSSM_EN << APPL_CTRL_HW_HOT_RST_MODE_SHIFT);
 	appl_writel(pcie, val, APPL_CTRL);
 
 	val = appl_readl(pcie, APPL_CFG_MISC);