@@ -212,6 +212,9 @@
#define RP_VEND_CTL1 0x00000f48
#define RP_VEND_CTL1_ERPT (1 << 13)
+#define RP_VEND_XP_BIST 0x00000f4c
+#define RP_VEND_XP_BIST_GOTO_L1_L2_AFTER_DLLP_DONE (1 << 28)
+
#define RP_VEND_CTL2 0x00000fa8
#define RP_VEND_CTL2_PCA_ENABLE (1 << 7)
@@ -537,6 +540,14 @@ static void tegra_pcie_enable_rp_features(struct tegra_pcie_port *port)
value |= RP_VEND_XP_OPPORTUNISTIC_ACK;
value |= RP_VEND_XP_OPPORTUNISTIC_UPDATEFC;
writel(value, port->base + RP_VEND_XP);
+
+ /*
+ * LTSSM will wait for DLLP to finish before entering L1 or L2,
+ * to avoid truncation of PM messages which results in receiver errors
+ */
+ value = readl(port->base + RP_VEND_XP_BIST);
+ value |= RP_VEND_XP_BIST_GOTO_L1_L2_AFTER_DLLP_DONE;
+ writel(value, port->base + RP_VEND_XP_BIST);
}
static void tegra_pcie_program_ectl_settings(struct tegra_pcie_port *port)
PM message are truncated while entering L1 or L2, which is resulting in receiver errors. Set the required bit to finish processing DLLP before link enter L1 or L2. Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com> --- drivers/pci/controller/pci-tegra.c | 11 +++++++++++ 1 file changed, 11 insertions(+)