Tegra210 platforms use sc7 entry firmware to program Tegra LP0/SC7 entry
sequence and sc7 entry firmware is run from COP/BPMP-Lite.
So, COP/BPMP-Lite still need IRQ function to finish SC7 suspend sequence
for Tegra210.
This patch has fix for leaving the COP IRQ enabled for Tegra210 during
interrupt controller suspend operation.
Signed-off-by: Sowjanya Komatineni <skomatineni@xxxxxxxxxx>
---
drivers/irqchip/irq-tegra.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/drivers/irqchip/irq-tegra.c b/drivers/irqchip/irq-tegra.c
index e1f771c72fc4..cf0c07052064 100644
--- a/drivers/irqchip/irq-tegra.c
+++ b/drivers/irqchip/irq-tegra.c
@@ -44,18 +44,22 @@ static unsigned int num_ictlrs;
struct tegra_ictlr_soc {
unsigned int num_ictlrs;
+ bool supports_sc7;
};
static const struct tegra_ictlr_soc tegra20_ictlr_soc = {
.num_ictlrs = 4,
+ .supports_sc7 = false,
};
static const struct tegra_ictlr_soc tegra30_ictlr_soc = {
.num_ictlrs = 5,
+ .supports_sc7 = false,
};
static const struct tegra_ictlr_soc tegra210_ictlr_soc = {
.num_ictlrs = 6,
+ .supports_sc7 = true,
};
static const struct of_device_id ictlr_matches[] = {
@@ -67,6 +71,7 @@ static const struct of_device_id ictlr_matches[] = {
struct tegra_ictlr_info {
void __iomem *base[TEGRA_MAX_NUM_ICTLRS];
+ const struct tegra_ictlr_soc *soc;
#ifdef CONFIG_PM_SLEEP
u32 cop_ier[TEGRA_MAX_NUM_ICTLRS];
u32 cop_iep[TEGRA_MAX_NUM_ICTLRS];
@@ -147,8 +152,19 @@ static int tegra_ictlr_suspend(void)
lic->cop_ier[i] = readl_relaxed(ictlr + ICTLR_COP_IER);
lic->cop_iep[i] = readl_relaxed(ictlr + ICTLR_COP_IEP_CLASS);
- /* Disable COP interrupts */
- writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR);
+ /*
+ * AVP/COP/BPMP-Lite is the Tegra boot processor.
+ *
+ * Tegra210 system suspend flow uses sc7entry firmware which
+ * is executed by COP/BPMP and it includes disabling COP IRQ,
+ * clamping CPU rail, turning off VDD_CPU, and preparing the
+ * system to go to SC7/LP0.
+ *
+ * COP/BPMP wakes up when COP IRQ is triggered and runs
+ * sc7entry-firmware. So need to keep COP interrupt enabled.
+ */
+ if (!lic->soc->supports_sc7)
+ writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR);
/* Disable CPU interrupts */
writel_relaxed(~0ul, ictlr + ICTLR_CPU_IER_CLR);
@@ -339,6 +355,7 @@ static int __init tegra_ictlr_init(struct device_node *node,
goto out_unmap;
}
+ lic->soc = soc;
tegra_ictlr_syscore_init();
pr_info("%pOF: %d interrupts forwarded to %pOF\n",
--
2.7.4
