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From: Maulik Shah <mkshah@codeaurora.org>
To: bjorn.andersson@linaro.org, maz@kernel.org,
	linus.walleij@linaro.org, swboyd@chromium.org,
	evgreen@chromium.org, mka@chromium.org
Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-gpio@vger.kernel.org, agross@kernel.org,
	tglx@linutronix.de, jason@lakedaemon.net, dianders@chromium.org,
	rnayak@codeaurora.org, ilina@codeaurora.org,
	lsrao@codeaurora.org, Maulik Shah <mkshah@codeaurora.org>
Subject: [PATCH v5 6/6] irqchip: qcom-pdc: Reset PDC interrupts during init
Date: Sat, 22 Aug 2020 21:47:01 +0530	[thread overview]
Message-ID: <1598113021-4149-7-git-send-email-mkshah@codeaurora.org> (raw)
In-Reply-To: <1598113021-4149-1-git-send-email-mkshah@codeaurora.org>

Kexec can directly boot into a new kernel without going to complete
reboot. This can leave the previous kernel's configuration for PDC
interrupts as is.

Clear previous kernel's configuration during init by setting interrupts
in enable bank to zero. The IRQs specified in qcom,pdc-ranges property
are the only ones that can be used by the new kernel so clear only those
IRQs. The remaining ones may be in use by a different kernel and should
not be set by new kernel.

Suggested-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
---
 drivers/irqchip/qcom-pdc.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/qcom-pdc.c b/drivers/irqchip/qcom-pdc.c
index 052a20d..7b40f07 100644
--- a/drivers/irqchip/qcom-pdc.c
+++ b/drivers/irqchip/qcom-pdc.c
@@ -343,7 +343,8 @@ 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)
@@ -372,6 +373,14 @@ static int pdc_setup_pin_mapping(struct device_node *np)
 						 &pdc_region[n].cnt);
 		if (ret)
 			return ret;
+
+		for (i = 0; i < pdc_region[n].cnt; i++) {
+			reg_index = (i + pdc_region[n].pin_base) >> 5;
+			irq_index = (i + pdc_region[n].pin_base) & 0x1f;
+			val = pdc_reg_read(IRQ_ENABLE_BANK, reg_index);
+			val &= ~BIT(irq_index);
+			pdc_reg_write(IRQ_ENABLE_BANK, reg_index, val);
+		}
 	}
 
 	return 0;
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation


  parent reply	other threads:[~2020-08-22 16:18 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-22 16:16 [PATCH v5 0/6] irqchip: qcom: pdc: Introduce irq_set_wake call Maulik Shah
2020-08-22 16:16 ` [PATCH v5 1/6] pinctrl: qcom: Set IRQCHIP_SET_TYPE_MASKED and IRQCHIP_MASK_ON_SUSPEND flags Maulik Shah
2020-08-31 18:33   ` Bjorn Andersson
2020-08-22 16:16 ` [PATCH v5 2/6] pinctrl: qcom: Use return value from irq_set_wake() call Maulik Shah
2020-08-31 18:19   ` Bjorn Andersson
2020-08-22 16:16 ` [PATCH v5 3/6] genirq/PM: Introduce IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND flag Maulik Shah
2020-08-25 10:12   ` Stephen Boyd
2020-08-25 21:38     ` Thomas Gleixner
2020-08-26  9:52       ` Maulik Shah
2020-08-26 10:15         ` Thomas Gleixner
2020-08-31 15:12           ` Doug Anderson
2020-09-01  9:51             ` Thomas Gleixner
2020-09-02 20:26               ` Doug Anderson
2020-09-03 12:57                 ` Thomas Gleixner
2020-09-03 23:19                   ` Doug Anderson
2020-09-04  9:54                     ` Thomas Gleixner
2020-09-08 19:05                       ` Doug Anderson
2020-09-10  8:51                         ` Thomas Gleixner
2020-08-22 16:16 ` [PATCH v5 4/6] pinctrl: qcom: Set " Maulik Shah
2020-08-25 10:14   ` Stephen Boyd
2020-08-25 19:58   ` Doug Anderson
2020-08-22 16:17 ` [PATCH v5 5/6] irqchip: qcom-pdc: " Maulik Shah
2020-08-25 10:14   ` Stephen Boyd
2020-08-25 19:59   ` Doug Anderson
2020-08-22 16:17 ` Maulik Shah [this message]
2020-08-25 10:14   ` [PATCH v5 6/6] irqchip: qcom-pdc: Reset PDC interrupts during init Stephen Boyd
2020-08-25 20:00   ` Doug Anderson
2020-08-27 22:48 ` [PATCH v5 0/6] irqchip: qcom: pdc: Introduce irq_set_wake call Linus Walleij

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