Re: [PATCH 02/11] dmaengine: cppi41: Split out the interrupt handler

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Hello.

On 01/09/2017 07:06 PM, Alexandre Bailon wrote:

The current interrupt handler do some actions specifics to am335x.
These actions should be made by the platform interrupt handler.
Split out the interrupt handler in two:
one for the am335x platform and a generic one.

Signed-off-by: Alexandre Bailon <abailon@xxxxxxxxxxxx>
---
 drivers/dma/cppi41.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/dma/cppi41.c b/drivers/dma/cppi41.c
index 25ee71d..42744ed 100644
--- a/drivers/dma/cppi41.c
+++ b/drivers/dma/cppi41.c
@@ -284,18 +284,11 @@ static u32 cppi41_pop_desc(struct cppi41_dd *cdd, unsigned queue_num)
 	return desc;
 }

-static irqreturn_t cppi41_irq(int irq, void *data)
+static irqreturn_t cppi41_irq(struct cppi41_dd *cdd)
 {
-	struct cppi41_dd *cdd = data;
 	struct cppi41_channel *c;
-	u32 status;
 	int i;

-	status = cppi_readl(cdd->usbss_mem + USBSS_IRQ_STATUS);
-	if (!(status & USBSS_IRQ_PD_COMP))
-		return IRQ_NONE;
-	cppi_writel(status, cdd->usbss_mem + USBSS_IRQ_STATUS);
-

I fail to understand why non-CPPI 4.1 regs are used here (and that positioning itself as an "abstract" CPPI 4.1 driver).

[...]
@@ -351,6 +344,19 @@ static irqreturn_t cppi41_irq(int irq, void *data)
 	return IRQ_HANDLED;
 }

+static irqreturn_t am335x_cppi41_irq(int irq, void *data)
+{
+	struct cppi41_dd *cdd = data;
+	u32 status;
+
+	status = cppi_readl(cdd->usbss_mem + USBSS_IRQ_STATUS);
+	if (!(status & USBSS_IRQ_PD_COMP))
+		return IRQ_NONE;
+	cppi_writel(status, cdd->usbss_mem + USBSS_IRQ_STATUS);
+
+	return cppi41_irq(cdd);
+}
+

   IMHO this stuff just needs to move to the MUSB glue.

[...]

MBR, Sergei

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