Re: [PATCH v3 1/2] libahci: Add support to handle HOST_IRQ_STAT as edge trigger latch.

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Hello.

On 5/3/2015 6:33 PM, Suman Tripathi wrote:

This patch adds the support to handle HOST_IRQ_STAT as edge trigger
latch.

Signed-off-by: Suman Tripathi <stripathi@xxxxxxx>
---
  drivers/ata/ahci.h    |  2 ++
  drivers/ata/libahci.c | 19 +++++++++++++++++++
  2 files changed, 21 insertions(+)

diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 71262e0..2df2237 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
[...]
+++ b/drivers/ata/libahci.c
@@ -1879,6 +1879,25 @@ static irqreturn_t ahci_single_irq_intr(int irq, void *dev_instance)
  	 */
  	writel(irq_stat, mmio + HOST_IRQ_STAT);

+	/*
+	 * HOST_IRQ_STAT behaves as edge trigger latch. When HOST_IRQ_STAT
+	 * detects a egde from PORT_IRQ_STAT, it happens to loose interrupts

   s/loose/lose/.

MBR, Sergei

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