linux-kernel - RE: gpmc_cs_request() causes early boot hang

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Date:	Mon, 24 Sep 2012 11:13:14 +0000
From:	"Mohammed, Afzal" <afzal@...com>
To:	Mark Jackson <mpfj-list@...c.co.uk>
CC:	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"tony@...mide.com >> Tony Lindgren" <tony@...mide.com>
Subject: RE: gpmc_cs_request() causes early boot hang

Hi Mark,

On Mon, Sep 24, 2012 at 16:21:40, Mark Jackson wrote:
> On 24/09/12 05:51, Mohammed, Afzal wrote:

> > It seems you are using PSP Kernel.
> > 
> > Invoking omap_init_gpmc before gpmc request should help.
> 
> Okay ... I'm now using earlyprintk and omap_init_gpmc(), but I still get boot hangs.

> Surely omap-gpmc needs to be setup before any calls such as gpmc_cs_request() ?
> 
> Is there a method to delay my test code, or maybe get the omap-gpmc registered earlier ?

Hope below patch helps you (untested)

Regards
Afzal

----8<-------------------

diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index 1c53c05..a4c6912 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -827,7 +827,19 @@ static struct platform_driver gpmc_driver = {
        },
 };
 
-module_platform_driver(gpmc_driver);
+static __init int gpmc_init(void)
+{
+        return platform_driver_register(&gpmc_driver);
+}
+
+static __exit void gpmc_exit(void)
+{
+        platform_driver_unregister(&gpmc_driver);
+
+}
+
+postcore_initcall(gpmc_init);
+module_exit(gpmc_exit);
 
 int gpmc_suspend(void)
 {
----8<----------------