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[Gnewsense-dev] [loongson-PATCH-v1 19/27] flush posted write to irq
From: |
wuzhangjin |
Subject: |
[Gnewsense-dev] [loongson-PATCH-v1 19/27] flush posted write to irq |
Date: |
Thu, 21 May 2009 06:10:01 +0800 |
From: Wu Zhangjin <address@hidden>
read back to flush the posted write, otherwise, there will be many
spurious irqs.
the previous talk: http://www.spinics.net/lists/mips/msg33749.html
Signed-off-by: Wu Zhangjin <address@hidden>
---
arch/mips/kernel/i8259.c | 2 ++
arch/mips/loongson/common/bonito-irq.c | 4 ++++
2 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/arch/mips/kernel/i8259.c b/arch/mips/kernel/i8259.c
index 413bd1d..0f93ab1 100644
--- a/arch/mips/kernel/i8259.c
+++ b/arch/mips/kernel/i8259.c
@@ -177,10 +177,12 @@ handle_real_irq:
outb(cached_slave_mask, PIC_SLAVE_IMR);
outb(0x60+(irq&7), PIC_SLAVE_CMD);/* 'Specific EOI' to slave */
outb(0x60+PIC_CASCADE_IR, PIC_MASTER_CMD); /* 'Specific EOI' to
master-IRQ2 */
+ inb(PIC_MASTER_CMD); /* flush posted write */
} else {
inb(PIC_MASTER_IMR); /* DUMMY - (do we need this?) */
outb(cached_master_mask, PIC_MASTER_IMR);
outb(0x60+irq, PIC_MASTER_CMD); /* 'Specific EOI to master */
+ inb(PIC_MASTER_CMD); /* flush posted write */
}
smtc_im_ack_irq(irq);
spin_unlock_irqrestore(&i8259A_lock, flags);
diff --git a/arch/mips/loongson/common/bonito-irq.c
b/arch/mips/loongson/common/bonito-irq.c
index 940c1f0..8f5a455 100644
--- a/arch/mips/loongson/common/bonito-irq.c
+++ b/arch/mips/loongson/common/bonito-irq.c
@@ -36,12 +36,16 @@
static inline void bonito_irq_enable(unsigned int irq)
{
LOONGSON_INTENSET = (1 << (irq - LOONGSON_IRQ_BASE));
+ /* flush posted write */
+ (void)LOONGSON_INTENSET;
mmiowb();
}
static inline void bonito_irq_disable(unsigned int irq)
{
LOONGSON_INTENCLR = (1 << (irq - LOONGSON_IRQ_BASE));
+ /* flush posted write */
+ (void)LOONGSON_INTENCLR;
mmiowb();
}
--
1.6.2.1
- [Gnewsense-dev] [loongson-PATCH-v1 07/27] replace tons of magic numbers by understandable symbols, (continued)
- [Gnewsense-dev] [loongson-PATCH-v1 07/27] replace tons of magic numbers by understandable symbols, wuzhangjin, 2009/05/21
- [Gnewsense-dev] [loongson-PATCH-v1 10/27] add loongson-specific cpu-feature-overrides.h, wuzhangjin, 2009/05/21
- [Gnewsense-dev] [loongson-PATCH-v1 11/27] split the loongson-specific part out, wuzhangjin, 2009/05/21
- [Gnewsense-dev] [loongson-PATCH-v1 12/27] add basic loongson-2f support, wuzhangjin, 2009/05/21
- [Gnewsense-dev] [loongson-PATCH-v1 13/27] add basic fuloong(2f) support, wuzhangjin, 2009/05/21
- [Gnewsense-dev] [loongson-PATCH-v1 14/27] enable serial port support of loongson-based machines, wuzhangjin, 2009/05/21
- [Gnewsense-dev] [loongson-PATCH-v1 15/27] add basic yeeloong(2f) laptop support, wuzhangjin, 2009/05/21
- [Gnewsense-dev] [loongson-PATCH-v1 17/27] define Loongson2F arch specific phys prot access, wuzhangjin, 2009/05/21
- [Gnewsense-dev] [loongson-PATCH-v1 16/27] Add Siliconmotion 712 framebuffer driver, wuzhangjin, 2009/05/21
- [Gnewsense-dev] [loongson-PATCH-v1 18/27] Loongson2 specific OProfile driver, wuzhangjin, 2009/05/21
- [Gnewsense-dev] [loongson-PATCH-v1 19/27] flush posted write to irq,
wuzhangjin <=
- [Gnewsense-dev] [loongson-PATCH-v1 21/27] Loongson2F cpufreq support, wuzhangjin, 2009/05/21
- [Gnewsense-dev] [loongson-PATCH-v1 20/27] CS5536 MFGPT as system clock source support, wuzhangjin, 2009/05/21
- [Gnewsense-dev] [loongson-PATCH-v1 22/27] Hibernation Support in mips system, wuzhangjin, 2009/05/21