linux-kernel - [PATCH v4 7/7] irqchip: qcom-pdc: Reset all pdc interrupts during init

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Date:   Mon, 10 Aug 2020 16:51:00 +0530
From:   Maulik Shah <mkshah@...eaurora.org>
To:     bjorn.andersson@...aro.org, maz@...nel.org,
        linus.walleij@...aro.org, swboyd@...omium.org,
        evgreen@...omium.org, mka@...omium.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-gpio@...r.kernel.org, agross@...nel.org, tglx@...utronix.de,
        jason@...edaemon.net, dianders@...omium.org, rnayak@...eaurora.org,
        ilina@...eaurora.org, lsrao@...eaurora.org,
        Maulik Shah <mkshah@...eaurora.org>
Subject: [PATCH v4 7/7] irqchip: qcom-pdc: Reset all pdc interrupts during init

Clear previous kernel's configuration during init by resetting
interrupts in enable bank to zero.

Suggested-by: Stephen Boyd <swboyd@...omium.org>
Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
---
 drivers/irqchip/qcom-pdc.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/qcom-pdc.c b/drivers/irqchip/qcom-pdc.c
index dfcdfc5..80e0dfb 100644
--- a/drivers/irqchip/qcom-pdc.c
+++ b/drivers/irqchip/qcom-pdc.c
@@ -389,7 +389,8 @@ static const struct irq_domain_ops qcom_pdc_gpio_ops = {
 
 static int pdc_setup_pin_mapping(struct device_node *np)
 {
-	int ret, n;
+	int ret, n, i;
+	u32 irq_index, reg_index, val;
 
 	n = of_property_count_elems_of_size(np, "qcom,pdc-ranges", sizeof(u32));
 	if (n <= 0 || n % 3)
@@ -418,6 +419,15 @@ static int pdc_setup_pin_mapping(struct device_node *np)
 						 &pdc_region[n].cnt);
 		if (ret)
 			return ret;
+
+		for (i = pdc_region[n].pin_base; i < pdc_region[n].pin_base +
+						 pdc_region[n].cnt; i++) {
+			reg_index = i / 32;
+			irq_index = i % 32;
+			val = pdc_reg_read(IRQ_ENABLE_BANK, reg_index);
+			val &= ~BIT(irq_index);
+			pdc_reg_write(IRQ_ENABLE_BANK, reg_index, val);
+		}
 	}
 
 	return 0;
-- 
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