bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-04-18 06:44:00 -04:00
Code Issues Packages Projects Releases Wiki Activity

PCI: tegra194: Enable hardware hot reset mode in Endpoint mode

Browse Source 
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 when the controller is operating in
endpoint mode.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
[mani: commit log]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Vidya Sagar <vidyas@nvidia.com>
Link: https://patch.msgid.link/20260324191000.1095768-6-mmaddireddy@nvidia.com
This commit is contained in:
Vidya Sagar
2026-03-25 00:39:56 +05:30
committed by Bjorn Helgaas
parent 66861c592a
commit acd46d51f2
1 changed files with 2 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

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

@@ -1796,6 +1796,8 @@ 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);