ipq806x: add patch to disable pretimeout on timer platform

Currently the watchdog timer is broken as it tries to
get an interrupt to setup pretimeout. Since our platform
have a different type of interrupt disable it and use
legacy watchdog probe.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>

1 files changed, 98 insertions, 0 deletions

diff --git a/target/linux/ipq806x/patches-5.4/0076-watchdog-qcom-wdt-disable-pretimeout-on-timer-platfo.patch b/target/linux/ipq806x/patches-5.4/0076-watchdog-qcom-wdt-disable-pretimeout-on-timer-platfo.patch
new file mode 100644
index 0000000000..394af16e12
--- /dev/null
+++ b/target/linux/ipq806x/patches-5.4/0076-watchdog-qcom-wdt-disable-pretimeout-on-timer-platfo.patch
@@ -0,0 +1,98 @@
+From 53ae145a7afa7686e03332d61eed90b7fa7c2529 Mon Sep 17 00:00:00 2001
+From: Ansuel Smith <ansuelsmth@gmail.com>
+Date: Tue, 4 Feb 2020 19:38:06 +0100
+Subject: [PATCH v2] watchdog: qcom-wdt: disable pretimeout on timer platform
+
+Some platform like ipq806x doesn't support pretimeout and define
+some interrupts used by qcom,msm-timer. Change the driver to check
+and use pretimeout only on qcom,kpss-wdt as it's the only platform
+that actually supports it.
+
+Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
+---
+ drivers/watchdog/qcom-wdt.c | 31 +++++++++++++++++++++++--------
+ 1 file changed, 23 insertions(+), 8 deletions(-)
+
+diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c
+index a494543d3ae1..d13c75028985 100644
+--- a/drivers/watchdog/qcom-wdt.c
++++ b/drivers/watchdog/qcom-wdt.c
+@@ -40,6 +40,11 @@ static const u32 reg_offset_data_kpss[] = {
+ 	[WDT_BITE_TIME] = 0x14,
+ };
+ 
++struct qcom_wdt_match_data {
++	const u32 *offset;
++	bool pretimeout;
++};
++
+ struct qcom_wdt {
+ 	struct watchdog_device	wdd;
+ 	unsigned long		rate;
+@@ -179,19 +184,29 @@ static void qcom_clk_disable_unprepare(void *data)
+ 	clk_disable_unprepare(data);
+ }
+ 
++static const struct qcom_wdt_match_data match_data_apcs_tmr = {
++	.offset = reg_offset_data_apcs_tmr,
++	.pretimeout = false,
++};
++
++static const struct qcom_wdt_match_data match_data_kpss = {
++	.offset = reg_offset_data_kpss,
++	.pretimeout = true,
++};
++
+ static int qcom_wdt_probe(struct platform_device *pdev)
+ {
+ 	struct device *dev = &pdev->dev;
+ 	struct qcom_wdt *wdt;
+ 	struct resource *res;
+ 	struct device_node *np = dev->of_node;
+-	const u32 *regs;
++	const struct qcom_wdt_match_data *data;
+ 	u32 percpu_offset;
+ 	int irq, ret;
+ 	struct clk *clk;
+ 
+-	regs = of_device_get_match_data(dev);
+-	if (!regs) {
++	data = of_device_get_match_data(dev);
++	if (!data) {
+ 		dev_err(dev, "Unsupported QCOM WDT module\n");
+ 		return -ENODEV;
+ 	}
+@@ -247,7 +262,7 @@ static int qcom_wdt_probe(struct platform_device *pdev)
+ 
+ 	/* check if there is pretimeout support */
+ 	irq = platform_get_irq_optional(pdev, 0);
+-	if (irq > 0) {
++	if (data->pretimeout && irq > 0) {
+ 		ret = devm_request_irq(dev, irq, qcom_wdt_isr,
+ 				       IRQF_TRIGGER_RISING,
+ 				       "wdt_bark", &wdt->wdd);
+@@ -267,7 +282,7 @@ static int qcom_wdt_probe(struct platform_device *pdev)
+ 	wdt->wdd.min_timeout = 1;
+ 	wdt->wdd.max_timeout = 0x10000000U / wdt->rate;
+ 	wdt->wdd.parent = dev;
+-	wdt->layout = regs;
++	wdt->layout = data->offset;
+ 
+ 	if (readl(wdt_addr(wdt, WDT_STS)) & 1)
+ 		wdt->wdd.bootstatus = WDIOF_CARDRESET;
+@@ -311,9 +326,9 @@ static int __maybe_unused qcom_wdt_resume(struct device *dev)
+ static SIMPLE_DEV_PM_OPS(qcom_wdt_pm_ops, qcom_wdt_suspend, qcom_wdt_resume);
+ 
+ static const struct of_device_id qcom_wdt_of_table[] = {
+-	{ .compatible = "qcom,kpss-timer", .data = reg_offset_data_apcs_tmr },
+-	{ .compatible = "qcom,scss-timer", .data = reg_offset_data_apcs_tmr },
+-	{ .compatible = "qcom,kpss-wdt", .data = reg_offset_data_kpss },
++	{ .compatible = "qcom,kpss-timer", .data = &match_data_apcs_tmr },
++	{ .compatible = "qcom,scss-timer", .data = &match_data_apcs_tmr },
++	{ .compatible = "qcom,kpss-wdt", .data = &match_data_kpss },
+ 	{ },
+ };
+ MODULE_DEVICE_TABLE(of, qcom_wdt_of_table);
+-- 
+2.24.0
+