linux-kernel - Re: [PATCH] Revert "smc91x: retrieve IRQ and trigger flags in a modern way"

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Message-ID: <878uew8xfe.fsf@free.fr>
Date:	Mon, 16 Mar 2015 22:06:13 +0100
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	David Miller <davem@...emloft.net>
Cc:	linus.walleij@...aro.org, nico@...xnic.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "smc91x: retrieve IRQ and trigger flags in a modern way"

David Miller <davem@...emloft.net> writes:

> From: Robert Jarzmik <robert.jarzmik@...e.fr>
> Date: Thu, 19 Feb 2015 21:48:49 +0100
>
>> Linus has submitted the patch [1]. I'll be watching carefully until -rc4 that
>> this is applied. If it's not, I'll reping you to apply this revert. Until then,
>> you can forget about it, I'll do the follow-up.
>> 
>> Does that plan sound good to you ?
>
> It sounds good to me.

Hi David,

Unfortunately Linus's patch didn't make it upstream. Therefore I'll ask you to
apply the revert, which is reminded in [1].

Cheers.

-- 
Robert

[1] Patch reminder
---<8---
From: Robert Jarzmik <robert.jarzmik@...e.fr>
Subject: [PATCH] Revert "smc91x: retrieve IRQ and trigger flags in a modern way"
To: Nicolas Pitre <nico@...xnic.net>, "David S. Miller" <davem@...emloft.net>, Linus Walleij <linus.walleij@...aro.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Robert Jarzmik <robert.jarzmik@...e.fr>
Date: Thu, 12 Feb 2015 17:59:10 +0100 (4 weeks, 4 days, 4 hours ago)
Message-Id: <1423760350-20149-1-git-send-email-robert.jarzmik@...e.fr>
X-Mailer: git-send-email 2.1.0

The commit breaks the legacy platforms, ie. these not using device-tree,
and setting up the interrupt resources with a flag to activate edge
detection. The issue was found on the zylonite platform.

The reason is that zylonite uses platform resources to pass the interrupt number
and the irq flags (here IORESOURCE_IRQ_HIGHEDGE). It expects the driver to
request the irq with these flags, which in turn setups the irq as high edge
triggered.

After the patch, this was supposed to be taken care of with :
  irq_resflags = irqd_get_trigger_type(irq_get_irq_data(ndev->irq));

But irq_resflags is 0 for legacy platforms, while for example in
arch/arm/mach-pxa/zylonite.c, in struct resource smc91x_resources[] the
irq flag is specified. This breaks zylonite because the interrupt is not
setup as triggered, and hardware doesn't provide interrupts.

Signed-off-by: Robert Jarzmik <robert.jarzmik@...e.fr>
---
 drivers/net/ethernet/smsc/smc91x.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/smsc/smc91x.c b/drivers/net/ethernet/smsc/smc91x.c
index 88a55f9..5d77e6f 100644
--- a/drivers/net/ethernet/smsc/smc91x.c
+++ b/drivers/net/ethernet/smsc/smc91x.c
@@ -2243,10 +2243,9 @@ static int smc_drv_probe(struct platform_device *pdev)
 	const struct of_device_id *match = NULL;
 	struct smc_local *lp;
 	struct net_device *ndev;
-	struct resource *res;
+	struct resource *res, *ires;
 	unsigned int __iomem *addr;
 	unsigned long irq_flags = SMC_IRQ_FLAGS;
-	unsigned long irq_resflags;
 	int ret;
 
 	ndev = alloc_etherdev(sizeof(struct smc_local));
@@ -2338,19 +2337,16 @@ static int smc_drv_probe(struct platform_device *pdev)
 		goto out_free_netdev;
 	}
 
-	ndev->irq = platform_get_irq(pdev, 0);
-	if (ndev->irq <= 0) {
+	ires = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!ires) {
 		ret = -ENODEV;
 		goto out_release_io;
 	}
-	/*
-	 * If this platform does not specify any special irqflags, or if
-	 * the resource supplies a trigger, override the irqflags with
-	 * the trigger flags from the resource.
-	 */
-	irq_resflags = irqd_get_trigger_type(irq_get_irq_data(ndev->irq));
-	if (irq_flags == -1 || irq_resflags & IRQF_TRIGGER_MASK)
-		irq_flags = irq_resflags & IRQF_TRIGGER_MASK;
+
+	ndev->irq = ires->start;
+
+	if (irq_flags == -1 || ires->flags & IRQF_TRIGGER_MASK)
+		irq_flags = ires->flags & IRQF_TRIGGER_MASK;
 
 	ret = smc_request_attrib(pdev, ndev);
 	if (ret)
-- 
2.1.0

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