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Message-Id: <20231129-j7200-tisci-s2r-v1-4-c1d5964ed574@bootlin.com>
Date: Wed, 29 Nov 2023 16:31:20 +0100
From: Thomas Richard <thomas.richard@...tlin.com>
To: Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>,
Santosh Shilimkar <ssantosh@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Vignesh Raghavendra <vigneshr@...com>
Cc: linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com,
gregory.clement@...tlin.com, u-kumar1@...com,
Thomas Richard <thomas.richard@...tlin.com>
Subject: [PATCH 4/5] firmware: ti-sci: for j7200 before suspend check the
reserved memory for lpm
On j7200, a reserved memory region is needed for TF-A to save its context
during suspend to ram.
In ti-sci suspend, check if the region was defined, if not return an
error.
Signed-off-by: Thomas Richard <thomas.richard@...tlin.com>
---
drivers/firmware/ti_sci.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
index c26ec86a5ff2..deaca17322df 100644
--- a/drivers/firmware/ti_sci.c
+++ b/drivers/firmware/ti_sci.c
@@ -77,6 +77,8 @@ struct ti_sci_xfers_info {
* simultaneously in the system
* @max_msg_size: Maximum size of data per message that can be handled.
* @restore_irqs: Set to true if allocated irqs shall be restored at resume
+ * @lpm_region: Set to true if a reserved memory region is needed for suspend to
+ * ram
*/
struct ti_sci_desc {
u8 default_host_id;
@@ -84,6 +86,7 @@ struct ti_sci_desc {
int max_msgs;
int max_msg_size;
bool restore_irqs;
+ bool lpm_region;
};
/**
@@ -3359,6 +3362,32 @@ static int tisci_reboot_handler(struct notifier_block *nb, unsigned long mode,
return NOTIFY_BAD;
}
+static bool ti_sci_check_lpm_region(void)
+{
+ struct device_node *parent, *node;
+
+ parent = of_find_node_by_path("/reserved-memory");
+ for_each_child_of_node(parent, node) {
+ if (of_node_name_eq(node, "lpm-memory"))
+ return true;
+ }
+
+ return false;
+}
+
+static int __maybe_unused ti_sci_suspend(struct device *dev)
+{
+ const struct ti_sci_desc *desc = device_get_match_data(dev);
+
+ if (pm_suspend_target_state == PM_SUSPEND_MEM &&
+ desc->lpm_region && !ti_sci_check_lpm_region()) {
+ dev_err(dev, "lpm region is required for suspend to ram but is not provided\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int __maybe_unused ti_sci_resume_noirq(struct device *dev)
{
const struct ti_sci_desc *desc = device_get_match_data(dev);
@@ -3387,6 +3416,7 @@ static int __maybe_unused ti_sci_resume_noirq(struct device *dev)
}
static const struct dev_pm_ops ti_sci_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(ti_sci_suspend, NULL)
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(NULL, ti_sci_resume_noirq)
};
@@ -3419,6 +3449,7 @@ static const struct ti_sci_desc ti_sci_pmmc_j7200_desc = {
.max_msgs = 20,
.max_msg_size = 64,
.restore_irqs = true,
+ .lpm_region = true,
};
static const struct of_device_id ti_sci_of_match[] = {
@@ -3546,6 +3577,11 @@ static int ti_sci_probe(struct platform_device *pdev)
}
}
+#ifdef CONFIG_PM_SLEEP
+ if (desc->lpm_region && !ti_sci_check_lpm_region())
+ dev_warn(dev, "lpm region is required for suspend to ram but is not provided\n");
+#endif
+
dev_info(dev, "ABI: %d.%d (firmware rev 0x%04x '%s')\n",
info->handle.version.abi_major, info->handle.version.abi_minor,
info->handle.version.firmware_revision,
--
2.39.2
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