linux-kernel - Re: [REGRESSION in 3.18][PPC] PA Semi fails to boot after: of/base: Fix PowerPC address parsing hack

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Date:	Sat, 07 Mar 2015 09:56:22 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh@...nel.org>, Olof Johansson <olof@...om.net>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [REGRESSION in 3.18][PPC] PA Semi fails to boot after: of/base:
 Fix PowerPC address parsing hack

On Fri, 2015-03-06 at 10:00 -0500, Steven Rostedt wrote:
> On Fri, 06 Mar 2015 15:18:42 +1100
> Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:
> 
>  
> > Can you shoot me the DT (/proc/device-tree in a tarball) ?
> 
> Attached.

This is indeed a bug in their DT. We might want to add quirks for
that unless it can be fixed (or has been via FW update). Olof ?

In the meantime, try that patch:

diff --git a/drivers/of/address.c b/drivers/of/address.c
index ad29069..78a7dcb 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -450,12 +450,17 @@ static struct of_bus *of_match_bus(struct device_node *np)
 	return NULL;
 }
 
-static int of_empty_ranges_quirk(void)
+static int of_empty_ranges_quirk(struct device_node *np)
 {
 	if (IS_ENABLED(CONFIG_PPC)) {
-		/* To save cycles, we cache the result */
+		/* To save cycles, we cache the result for global "Mac" setting */
 		static int quirk_state = -1;
 
+		/* PA-SEMI sdc DT bug */
+		if (of_device_is_compatible(np, "1682m-sdc"))
+			return true;
+
+		/* Make quirk cached */
 		if (quirk_state < 0)
 			quirk_state =
 				of_machine_is_compatible("Power Macintosh") ||
@@ -490,7 +495,7 @@ static int of_translate_one(struct device_node *parent, struct of_bus *bus,
 	 * This code is only enabled on powerpc. --gcl
 	 */
 	ranges = of_get_property(parent, rprop, &rlen);
-	if (ranges == NULL && !of_empty_ranges_quirk()) {
+	if (ranges == NULL && !of_empty_ranges_quirk(parent)) {
 		pr_debug("OF: no ranges; cannot translate\n");
 		return 1;
 	}


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