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media: ddbridge: improve separated MSI IRQ handling

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Improve IRQ handling in the separated MSG/I2C and IO/TSDATA handlers by
applying a mask for recognized bits immediately upon reading the IRQ mask
from the hardware, so only the bits/IRQs that actually were set will be
acked.

Picked up from the upstream dddvb-0.9.33 release.

Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Daniel Scheller 2018-04-09 12:47:42 -04:00 committed by Mauro Carvalho Chehab
parent e8227689f9
commit 285d490c31
1 changed files with 12 additions and 10 deletions
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22
drivers/media/pci/ddbridge/ddbridge-core.c
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@ -2428,16 +2428,17 @@ static void irq_handle_io(struct ddb *dev, u32 s)
irqreturn_t ddb_irq_handler0(int irq, void *dev_id)
{
struct ddb *dev = (struct ddb *)dev_id;
u32 s = ddbreadl(dev, INTERRUPT_STATUS);
u32 mask = 0x8fffff00;
u32 s = mask & ddbreadl(dev, INTERRUPT_STATUS);
if (!s)
return IRQ_NONE;
do {
if (s & 0x80000000)
return IRQ_NONE;
if (!(s & 0xfffff00))
return IRQ_NONE;
ddbwritel(dev, s & 0xfffff00, INTERRUPT_ACK);
ddbwritel(dev, s, INTERRUPT_ACK);
irq_handle_io(dev, s);
} while ((s = ddbreadl(dev, INTERRUPT_STATUS)));
} while ((s = mask & ddbreadl(dev, INTERRUPT_STATUS)));
return IRQ_HANDLED;
}
@ -2445,16 +2446,17 @@ irqreturn_t ddb_irq_handler0(int irq, void *dev_id)
irqreturn_t ddb_irq_handler1(int irq, void *dev_id)
{
struct ddb *dev = (struct ddb *)dev_id;
u32 s = ddbreadl(dev, INTERRUPT_STATUS);
u32 mask = 0x8000000f;
u32 s = mask & ddbreadl(dev, INTERRUPT_STATUS);
if (!s)
return IRQ_NONE;
do {
if (s & 0x80000000)
return IRQ_NONE;
if (!(s & 0x0000f))
return IRQ_NONE;
ddbwritel(dev, s & 0x0000f, INTERRUPT_ACK);
ddbwritel(dev, s, INTERRUPT_ACK);
irq_handle_msg(dev, s);
} while ((s = ddbreadl(dev, INTERRUPT_STATUS)));
} while ((s = mask & ddbreadl(dev, INTERRUPT_STATUS)));
return IRQ_HANDLED;
}