linux-kernel - Re: [PATCH 29/35] arm: omap: intc: switch over to linear irq domain

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Message-ID: <20140729163345.GF17808@saruman.home>
Date:	Tue, 29 Jul 2014 11:33:45 -0500
From:	Felipe Balbi <balbi@...com>
To:	Felipe Balbi <balbi@...com>
CC:	Tony Lindgren <tony@...mide.com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>, <bcousson@...libre.com>,
	<linux@....linux.org.uk>, <khilman@...prootsystems.com>,
	<tglx@...utronix.de>, <jason@...edaemon.net>,
	<devicetree@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 29/35] arm: omap: intc: switch over to linear irq domain

Hi,

On Tue, Jul 29, 2014 at 10:40:57AM -0500, Felipe Balbi wrote:
> On Tue, Jul 29, 2014 at 08:20:52AM -0700, Tony Lindgren wrote:
> > * Felipe Balbi <balbi@...com> [140729 07:18]:
> > > Hi,
> > > 
> > > On Tue, Jul 29, 2014 at 05:14:25AM -0700, Tony Lindgren wrote:
> > > > * Felipe Balbi <balbi@...com> [140728 14:19]:
> > > > > now that we don't need to support legacy board-files,
> > > > > we can completely switch over to a linear irq domain
> > > > > and make use of irq_alloc_domain_generic_chips() to
> > > > > allocate all generic irq chips for us.
> > > > 
> > > > This patch seems to somehow break off-idle for omap3 
> > > > where it no longer wakes up.
> > > 
> > > Sure your bisection is correct ? This patch just switches from legacy
> > > irq domain to linear irq domain.
> > 
> > Yes, I tried it a few times. Just enabling
> > retention idle hangs too with this patch.
> > 
> > Maybe it's omap3_prcm_irq_setup that relies on
> > 11 + OMAP_INTC_START? There may be other such issues
> 
> lol.
> 
> OMAP4 has the same nonsense.

made me think why (if) OMAP4 works with that same setup. Does wake from
OFF work with OMAP4 ?

Anyway, here's a quick little hack to check if that's the reason for the
regression:

diff --git a/arch/arm/boot/dts/omap3.dtsi b/arch/arm/boot/dts/omap3.dtsi
index ff953c9..c234b98 100644
--- a/arch/arm/boot/dts/omap3.dtsi
+++ b/arch/arm/boot/dts/omap3.dtsi
@@ -97,6 +97,7 @@
 		prm: prm@...06000 {
 			compatible = "ti,omap3-prm";
 			reg = <0x48306000 0x4000>;
+			interrupts = <11>;
 
 			prm_clocks: clocks {
 				#address-cells = <1>;
diff --git a/arch/arm/mach-omap2/prm_common.c b/arch/arm/mach-omap2/prm_common.c
index 25e8b82..3d11377 100644
--- a/arch/arm/mach-omap2/prm_common.c
+++ b/arch/arm/mach-omap2/prm_common.c
@@ -242,6 +242,11 @@ void omap_prcm_irq_complete(void)
 	prcm_irq_setup->restore_irqen(prcm_irq_setup->saved_mask);
 }
 
+static struct of_device_id tmp[] = {
+	{ .compatible = "ti,omap3-prm" },
+	{ }
+};
+
 /**
  * omap_prcm_register_chain_handler - initializes the prcm chained interrupt
  * handler based on provided parameters
@@ -254,17 +259,24 @@ void omap_prcm_irq_complete(void)
  */
 int omap_prcm_register_chain_handler(struct omap_prcm_irq_setup *irq_setup)
 {
+	struct device_node *node;
 	int nr_regs;
 	u32 mask[OMAP_PRCM_MAX_NR_PENDING_REG];
 	int offset, i;
+	int irq;
 	struct irq_chip_generic *gc;
 	struct irq_chip_type *ct;
 
 	if (!irq_setup)
 		return -EINVAL;
 
+	irq = irq_setup->irq;
 	nr_regs = irq_setup->nr_regs;
 
+	node = of_find_matching_node(NULL, tmp);
+	if (node)
+		irq = of_irq_get(node, 0);
+
 	if (prcm_irq_setup) {
 		pr_err("PRCM: already initialized; won't reinitialize\n");
 		return -EINVAL;
@@ -298,7 +310,7 @@ int omap_prcm_register_chain_handler(struct omap_prcm_irq_setup *irq_setup)
 				1 << (offset & 0x1f);
 	}
 
-	irq_set_chained_handler(irq_setup->irq, omap_prcm_irq_handler);
+	irq_set_chained_handler(irq, omap_prcm_irq_handler);
 
 	irq_setup->base_irq = irq_alloc_descs(-1, 0, irq_setup->nr_regs * 32,
 		0);

-- 
balbi

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