Commit-ID: 2ca6b9bcaad4a78af255be9e16b3f3062a6d7c32
Gitweb: https://git.kernel.org/tip/2ca6b9bcaad4a78af255be9e16b3f3062a6d7c32
Author: Ludovic Barre <ludovic.barre@xxxxxx>
AuthorDate: Mon, 6 Nov 2017 18:03:35 +0100
Committer: Marc Zyngier <marc.zyngier@xxxxxxx>
CommitDate: Tue, 7 Nov 2017 11:44:35 +0000
irqchip/stm32: Fix initial values
-After cold boot, imr default value depends on hardware configuration.
-After hot reboot the registers must be cleared to avoid residue.
Signed-off-by: Ludovic Barre <ludovic.barre@xxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
drivers/irqchip/irq-stm32-exti.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-exti.c
index 8f409a9..477d0fa 100644
--- a/drivers/irqchip/irq-stm32-exti.c
+++ b/drivers/irqchip/irq-stm32-exti.c
@@ -258,7 +258,16 @@ __init stm32_exti_init(const struct stm32_exti_bank **stm32_exti_banks,
writel_relaxed(~0UL, base + stm32_bank->rtsr_ofst);
irqs_mask = readl_relaxed(base + stm32_bank->rtsr_ofst);
nr_exti = fls(readl_relaxed(base + stm32_bank->rtsr_ofst));
+
+ /*
+ * This IP has no reset, so after hot reboot we should
+ * clear registers to avoid residue
+ */
+ writel_relaxed(0, base + stm32_bank->imr_ofst);
+ writel_relaxed(0, base + stm32_bank->emr_ofst);
writel_relaxed(0, base + stm32_bank->rtsr_ofst);
+ writel_relaxed(0, base + stm32_bank->ftsr_ofst);
+ writel_relaxed(~0UL, base + stm32_bank->pr_ofst);
pr_info("%s: bank%d, External IRQs available:%#x\n",
node->full_name, i, irqs_mask);
--
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