linux-kernel - [PATCH v5] irqchip/mmp: only touch the PJ4 & FIQ bits on enable/disable

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Date:   Mon, 28 Jan 2019 16:59:35 +0100
From:   Lubomir Rintel <lkundrak@...sk>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     Jason Cooper <jason@...edaemon.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, stable@...nel.org,
        Lubomir Rintel <lkundrak@...sk>, Pavel Machek <pavel@....cz>
Subject: [PATCH v5] irqchip/mmp: only touch the PJ4 & FIQ bits on enable/disable

Resetting the bit 4 disables the interrupt delivery to the "secure
processor" core. This breaks the keyboard on a OLPC XO 1.75 laptop,
where the firmware running on the "secure processor" bit-bangs the
PS/2 protocol over the GPIO lines.

It is not clear what the rest of the bits are and Marvel was unhelpful
when asked for documentation. Aside from the SP bit, there are probably
priority bits.

Leaving the unknown bits as the firmware set them up seems to be a wiser
course of action compared to just turning them off.

Signed-off-by: Lubomir Rintel <lkundrak@...sk>
Acked-by: Pavel Machek <pavel@....cz>

---
Changes since v4:
- Remove unused ICU_INT_ROUTE_SP_IRQ define
- Try to further clarify the commit message

Changes since v3:
- Use #defined instead of integer literals

Changes since v2:
- Correct subsystem maintainers on Cc (irqchip)

Changes since v1:
- Adjusted wording & ack from Pavel
---
 drivers/irqchip/irq-mmp.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-mmp.c b/drivers/irqchip/irq-mmp.c
index 37a54797a137..fac8f1365f76 100644
--- a/drivers/irqchip/irq-mmp.c
+++ b/drivers/irqchip/irq-mmp.c
@@ -34,6 +34,9 @@
 #define SEL_INT_PENDING		(1 << 6)
 #define SEL_INT_NUM_MASK	0x3f
 
+#define MMP2_ICU_INT_ROUTE_PJ4_IRQ	(1 << 5)
+#define MMP2_ICU_INT_ROUTE_PJ4_FIQ	(1 << 6)
+
 struct icu_chip_data {
 	int			nr_irqs;
 	unsigned int		virq_base;
@@ -190,7 +193,8 @@ static const struct mmp_intc_conf mmp_conf = {
 static const struct mmp_intc_conf mmp2_conf = {
 	.conf_enable	= 0x20,
 	.conf_disable	= 0x0,
-	.conf_mask	= 0x7f,
+	.conf_mask	= MMP2_ICU_INT_ROUTE_PJ4_IRQ |
+			  MMP2_ICU_INT_ROUTE_PJ4_FIQ,
 };
 
 static void __exception_irq_entry mmp_handle_irq(struct pt_regs *regs)
-- 
2.20.1