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[V1,7/9] PCI: tegra194: Disable direct speed change for EP

Message ID 20220919143627.13803-8-vidyas@nvidia.com (mailing list archive)
State Superseded
Delegated to: Lorenzo Pieralisi
Headers show
Series Enhancements to pcie-tegra194 driver | expand

Commit Message

Vidya Sagar Sept. 19, 2022, 2:36 p.m. UTC 
Disable direct speed change for endpoint to prevent it from doing
speed change by itself post physical layer link up at gen1 and also
to leave link speed in control of the host.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
---
 drivers/pci/controller/dwc/pcie-tegra194.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index e38fedd42034..35d9c3ac3028 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1872,6 +1872,10 @@  static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie)
 
 	reset_control_deassert(pcie->core_rst);
 
+	val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
+	val &= ~PORT_LOGIC_SPEED_CHANGE;
+	dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
+
 	if (pcie->update_fc_fixup) {
 		val = dw_pcie_readl_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF);
 		val |= 0x1 << CFG_TIMER_CTRL_ACK_NAK_SHIFT;