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irqchip/mmp: Only touch the PJ4 IRQ & FIQ bits on enable/disable

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Resetting 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 Marvell 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@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>
[maz: fixed-up subject and commit message]
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Lubomir Rintel 2019-01-28 16:59:35 +01:00 committed by Marc Zyngier
parent 45725e0fc3
commit 2380a22b60
1 changed files with 5 additions and 1 deletions
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6
drivers/irqchip/irq-mmp.c
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@ -34,6 +34,9 @@
#define SEL_INT_PENDING (1 << 6) #define SEL_INT_PENDING (1 << 6)
#define SEL_INT_NUM_MASK 0x3f #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 { struct icu_chip_data {
int nr_irqs; int nr_irqs;
unsigned int virq_base; unsigned int virq_base;
@ -190,7 +193,8 @@ static const struct mmp_intc_conf mmp_conf = {
static const struct mmp_intc_conf mmp2_conf = { static const struct mmp_intc_conf mmp2_conf = {
.conf_enable = 0x20, .conf_enable = 0x20,
.conf_disable = 0x0, .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) static void __exception_irq_entry mmp_handle_irq(struct pt_regs *regs)