[patch] provide rtc_cmos platform device, take 2

[patch] provide rtc_cmos platform device, take 2

[Stas Sergeev]

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Hello.

[forgot to CC this to LKML, doing now]

akpm@linux-foundation.org wrote:
> This patch was dropped because an updated version will be merged
How is the attached one for an updated
version? Please check the compilation
on arm as I haven't done that.

----
Recently (around 2.6.25) I've noticed that RTC no longer works for me.  It
turned out this is because I use pnpacpi=off kernel option to work around
the parport_pc bugs.  I always did so, but RTC used to work fine in the
past, and now it have regressed.

The attached patch fixes the problem by creating the platform device for
the RTC when PNP is disabled.  This may also help running the PNP-enabled
kernel on an older PCs.

Signed-off-by: Stas Sergeev <stsp@aknet.ru>
Cc: David Brownell <david-b@pacbell.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Adam Belay <ambx1@neo.rr.com>


[-- Attachment #2: rtc_platf1.diff --]
[-- Type: text/x-patch, Size: 2636 bytes --]

diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c
index 9615eee..01459d2 100644
--- a/arch/x86/kernel/rtc.c
+++ b/arch/x86/kernel/rtc.c
@@ -4,9 +4,12 @@
 #include <linux/acpi.h>
 #include <linux/bcd.h>
 #include <linux/mc146818rtc.h>
+#include <linux/platform_device.h>
+#include <linux/pnp.h>
 
 #include <asm/time.h>
 #include <asm/vsyscall.h>
+#include <asm/mc146818rtc.h>
 
 #ifdef CONFIG_X86_32
 /*
@@ -197,3 +200,35 @@ unsigned long long native_read_tsc(void)
 }
 EXPORT_SYMBOL(native_read_tsc);
 
+
+static struct resource rtc_resources[] = {
+	[0] = {
+		.start	= RTC_PORT(0),
+		.end	= RTC_PORT(1),
+		.flags	= IORESOURCE_IO,
+	},
+	[1] = {
+		.start	= RTC_IRQ,
+		.end	= RTC_IRQ,
+		.flags	= IORESOURCE_IRQ,
+	}
+};
+
+static struct platform_device rtc_device = {
+	.name		= "rtc_cmos",
+	.id		= -1,
+	.resource	= rtc_resources,
+	.num_resources	= ARRAY_SIZE(rtc_resources),
+};
+
+static __init int add_rtc_cmos(void)
+{
+#ifdef CONFIG_PNP
+	if (!pnp_platform_devices)
+		platform_device_register(&rtc_device);
+#else
+	platform_device_register(&rtc_device);
+#endif /* CONFIG_PNP */
+	return 0;
+}
+device_initcall(add_rtc_cmos);
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index d060a06..d7bb9ba 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -905,19 +905,7 @@ static struct pnp_driver cmos_pnp_driver = {
 	.resume		= cmos_pnp_resume,
 };
 
-static int __init cmos_init(void)
-{
-	return pnp_register_driver(&cmos_pnp_driver);
-}
-module_init(cmos_init);
-
-static void __exit cmos_exit(void)
-{
-	pnp_unregister_driver(&cmos_pnp_driver);
-}
-module_exit(cmos_exit);
-
-#else	/* no PNP */
+#endif	/* CONFIG_PNP */
 
 /*----------------------------------------------------------------*/
 
@@ -958,20 +946,33 @@ static struct platform_driver cmos_platform_driver = {
 
 static int __init cmos_init(void)
 {
+#ifdef	CONFIG_PNP
+	if (pnp_platform_devices)
+		return pnp_register_driver(&cmos_pnp_driver);
+	else
+		return platform_driver_probe(&cmos_platform_driver,
+			cmos_platform_probe);
+#else
 	return platform_driver_probe(&cmos_platform_driver,
 			cmos_platform_probe);
+#endif /* CONFIG_PNP */
 }
 module_init(cmos_init);
 
 static void __exit cmos_exit(void)
 {
+#ifdef	CONFIG_PNP
+	if (pnp_platform_devices)
+		pnp_unregister_driver(&cmos_pnp_driver);
+	else
+		platform_driver_unregister(&cmos_platform_driver);
+#else
 	platform_driver_unregister(&cmos_platform_driver);
+#endif /* CONFIG_PNP */
 }
 module_exit(cmos_exit);
 
 
-#endif	/* !PNP */
-
 MODULE_AUTHOR("David Brownell");
 MODULE_DESCRIPTION("Driver for PC-style 'CMOS' RTCs");
 MODULE_LICENSE("GPL");

[patch][resend] provide rtc_cmos platform device, take 2

[Stas Sergeev]

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Hello.

akpm@linux-foundation.org wrote:
> This patch was dropped because an updated version will be merged
How is the attached one for an updated
version?

----
RTC doesn't work with pnpacpi=off.
The attached patch fixes the problem by creating the platform device for
the RTC when PNP is disabled. This may also help running the PNP-enabled
kernel on an older PCs.

Signed-off-by: Stas Sergeev <stsp@aknet.ru>
Cc: David Brownell <david-b@pacbell.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Adam Belay <ambx1@neo.rr.com>
CC: Russell King <rmk+lkml@arm.linux.org.uk>

[-- Attachment #2: rtc_platf1.diff --]
[-- Type: text/x-patch, Size: 2636 bytes --]

diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c
index 9615eee..01459d2 100644
--- a/arch/x86/kernel/rtc.c
+++ b/arch/x86/kernel/rtc.c
@@ -4,9 +4,12 @@
 #include <linux/acpi.h>
 #include <linux/bcd.h>
 #include <linux/mc146818rtc.h>
+#include <linux/platform_device.h>
+#include <linux/pnp.h>
 
 #include <asm/time.h>
 #include <asm/vsyscall.h>
+#include <asm/mc146818rtc.h>
 
 #ifdef CONFIG_X86_32
 /*
@@ -197,3 +200,35 @@ unsigned long long native_read_tsc(void)
 }
 EXPORT_SYMBOL(native_read_tsc);
 
+
+static struct resource rtc_resources[] = {
+	[0] = {
+		.start	= RTC_PORT(0),
+		.end	= RTC_PORT(1),
+		.flags	= IORESOURCE_IO,
+	},
+	[1] = {
+		.start	= RTC_IRQ,
+		.end	= RTC_IRQ,
+		.flags	= IORESOURCE_IRQ,
+	}
+};
+
+static struct platform_device rtc_device = {
+	.name		= "rtc_cmos",
+	.id		= -1,
+	.resource	= rtc_resources,
+	.num_resources	= ARRAY_SIZE(rtc_resources),
+};
+
+static __init int add_rtc_cmos(void)
+{
+#ifdef CONFIG_PNP
+	if (!pnp_platform_devices)
+		platform_device_register(&rtc_device);
+#else
+	platform_device_register(&rtc_device);
+#endif /* CONFIG_PNP */
+	return 0;
+}
+device_initcall(add_rtc_cmos);
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index d060a06..d7bb9ba 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -905,19 +905,7 @@ static struct pnp_driver cmos_pnp_driver = {
 	.resume		= cmos_pnp_resume,
 };
 
-static int __init cmos_init(void)
-{
-	return pnp_register_driver(&cmos_pnp_driver);
-}
-module_init(cmos_init);
-
-static void __exit cmos_exit(void)
-{
-	pnp_unregister_driver(&cmos_pnp_driver);
-}
-module_exit(cmos_exit);
-
-#else	/* no PNP */
+#endif	/* CONFIG_PNP */
 
 /*----------------------------------------------------------------*/
 
@@ -958,20 +946,33 @@ static struct platform_driver cmos_platform_driver = {
 
 static int __init cmos_init(void)
 {
+#ifdef	CONFIG_PNP
+	if (pnp_platform_devices)
+		return pnp_register_driver(&cmos_pnp_driver);
+	else
+		return platform_driver_probe(&cmos_platform_driver,
+			cmos_platform_probe);
+#else
 	return platform_driver_probe(&cmos_platform_driver,
 			cmos_platform_probe);
+#endif /* CONFIG_PNP */
 }
 module_init(cmos_init);
 
 static void __exit cmos_exit(void)
 {
+#ifdef	CONFIG_PNP
+	if (pnp_platform_devices)
+		pnp_unregister_driver(&cmos_pnp_driver);
+	else
+		platform_driver_unregister(&cmos_platform_driver);
+#else
 	platform_driver_unregister(&cmos_platform_driver);
+#endif /* CONFIG_PNP */
 }
 module_exit(cmos_exit);
 
 
-#endif	/* !PNP */
-
 MODULE_AUTHOR("David Brownell");
 MODULE_DESCRIPTION("Driver for PC-style 'CMOS' RTCs");
 MODULE_LICENSE("GPL");

Re: [patch][resend] provide rtc_cmos platform device, take 2

[Andrew Morton]

On Tue, 27 May 2008 15:23:06 +0400
Stas Sergeev <stsp@aknet.ru> wrote:

> RTC doesn't work with pnpacpi=off.
> The attached patch fixes the problem by creating the platform device for
> the RTC when PNP is disabled. This may also help running the PNP-enabled
> kernel on an older PCs.
> 
> Signed-off-by: Stas Sergeev <stsp@aknet.ru>
> Cc: David Brownell <david-b@pacbell.net>
> Cc: Ingo Molnar <mingo@elte.hu>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
> Cc: Adam Belay <ambx1@neo.rr.com>
> CC: Russell King <rmk+lkml@arm.linux.org.uk>

So is everyone happy with this now?

It got lost from the changelog but IIRC this fixes a small sort-of regression
which was added in 2.6.25(?) because Stas switched drivers.  I assume
that the incompatibility was unintentional.

So it might be 2.6.26 material, and possibly even 2.6.25.x?

Re: [patch][resend] provide rtc_cmos platform device, take 2

[Stas Sergeev]

Hello.

Andrew Morton wrote:
> It got lost from the changelog but IIRC this fixes a small sort-of regression
> which was added in 2.6.25(?) because Stas switched drivers.
The switch was behind my will (kconfig
changed), here's what David says:
http://uwsg.ucs.indiana.edu/hypermail/linux/kernel/0805.2/3467.html
http://uwsg.ucs.indiana.edu/hypermail/linux/kernel/0805.2/3060.html

Re: [patch][resend] provide rtc_cmos platform device, take 2

[David Brownell]

On Tuesday 27 May 2008, Stas Sergeev wrote:
> --- a/arch/x86/kernel/rtc.c
> +++ b/arch/x86/kernel/rtc.c
> @@ -4,9 +4,12 @@
>  #include <linux/acpi.h>
>  #include <linux/bcd.h>
>  #include <linux/mc146818rtc.h>
> +#include <linux/platform_device.h>
> +#include <linux/pnp.h>
>  
>  #include <asm/time.h>
>  #include <asm/vsyscall.h>
> +#include <asm/mc146818rtc.h>

The <asm/mc146818rtc.h> isn't needed, since it's automatically
included via <linux/mc146818rtc.h> ... see right at the top.

And for good fun, notice how the asm file includes the linux
version ... seems like a cleanup would be nice someday.  :)


> --- a/drivers/rtc/rtc-cmos.c
> +++ b/drivers/rtc/rtc-cmos.c

> @@ -958,20 +946,33 @@ static struct platform_driver cmos_platform_driver = {
>  
>  static int __init cmos_init(void)
>  {
> +#ifdef CONFIG_PNP
> +       if (pnp_platform_devices)
> +               return pnp_register_driver(&cmos_pnp_driver);
> +       else
> +               return platform_driver_probe(&cmos_platform_driver,
> +                       cmos_platform_probe);
> +#else
>         return platform_driver_probe(&cmos_platform_driver,
>                         cmos_platform_probe);
> +#endif /* CONFIG_PNP */
>  }
>  module_init(cmos_init);

That's kind of ugly, but not wrong.

My only question is whether that resolves the problem Russell was 
reporting.  I think his situation needed to register *both* types
of bus glue (but I never saw his patch).  If we're going to fix this,
best merge just one patch...

- Dave

Re: [patch][resend] provide rtc_cmos platform device, take 2

[Bjorn Helgaas]

On Wednesday 28 May 2008 05:36:00 pm Andrew Morton wrote:
> On Tue, 27 May 2008 15:23:06 +0400
> Stas Sergeev <stsp@aknet.ru> wrote:
> 
> > RTC doesn't work with pnpacpi=off.
> > The attached patch fixes the problem by creating the platform device for
> > the RTC when PNP is disabled. This may also help running the PNP-enabled
> > kernel on an older PCs.
> > 
> > Signed-off-by: Stas Sergeev <stsp@aknet.ru>
> > Cc: David Brownell <david-b@pacbell.net>
> > Cc: Ingo Molnar <mingo@elte.hu>
> > Cc: Thomas Gleixner <tglx@linutronix.de>
> > Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
> > Cc: Adam Belay <ambx1@neo.rr.com>
> > CC: Russell King <rmk+lkml@arm.linux.org.uk>
> 
> So is everyone happy with this now?
> 
> It got lost from the changelog but IIRC this fixes a small sort-of regression
> which was added in 2.6.25(?) because Stas switched drivers.  I assume
> that the incompatibility was unintentional.
> 
> So it might be 2.6.26 material, and possibly even 2.6.25.x?

I don't really have an opinion on the RTC patch itself, but I would
like to understand why you're using "pnpacpi=off".

As far as I'm concerned, "pnpacpi=off" should only be used to work
around defects, so I'd like to fix the defect you're seeing with
parport_pc.  Is there a bug report for it?

We recently fixed some PNPACPI problems that caused parport_pc
problems, i.e.,
    http://bugzilla.kernel.org/show_bug.cgi?id=5832
    http://bugzilla.kernel.org/show_bug.cgi?id=9487

Andrew added these patches to his -mm tree, but I don't think he's
released a patchset that contains them yet.  I'll attach the patch
in case you want to try it.  Let me know what happens.

Bjorn



PNPACPI: use _CRS IRQ descriptor length for _SRS

When configuring the resources of an ACPI device, we first
evaluate _CRS to get a template of resource descriptors, then
fill in the specific resource values we want, and finally
evaluate _SRS to actually configure the device.

Some resources have optional fields, so the size of encoded
descriptors varies depending on the specific values.  For
example, IRQ descriptors can be either two or three bytes long.
The third byte contains triggering information and can be
omitted if the IRQ is edge-triggered and active high.

The BIOS often assumes that IRQ descriptors in the _SRS
buffer use the same format as those in the _CRS buffer, so
this patch enforces that constraint.

The "Start Dependent Function" descriptor also has an optional
byte, but we don't currently encode those descriptors, so I
didn't do anything for those.

I have tested this patch on a Toshiba Portege 4000.  Without
the patch, parport_pc claims the parallel port only if I use
"pnpacpi=off".  This patch makes it work with PNPACPI.

This is an extension of a patch by Tom Jaeger:
    http://bugzilla.kernel.org/show_bug.cgi?id=9487#c42

References:
    http://bugzilla.kernel.org/show_bug.cgi?id=5832 Enabling ACPI Plug and Play in kernels >2.6.9 kills Parallel support
    http://bugzilla.kernel.org/show_bug.cgi?id=9487 buggy firmware expects four-byte IRQ resource descriptor (was: Serial port disappears after Suspend on Toshiba R25)
    http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=1d5b285da1893b90507b081664ac27f1a8a3dc5b related ACPICA fix

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>

Index: work11/drivers/pnp/pnpacpi/rsparser.c
===================================================================
--- work11.orig/drivers/pnp/pnpacpi/rsparser.c	2008-05-22 13:41:52.000000000 -0600
+++ work11/drivers/pnp/pnpacpi/rsparser.c	2008-05-27 10:34:32.000000000 -0600
@@ -742,6 +742,9 @@ static acpi_status pnpacpi_type_resource
 	if (pnpacpi_supported_resource(res)) {
 		(*resource)->type = res->type;
 		(*resource)->length = sizeof(struct acpi_resource);
+		if (res->type == ACPI_RESOURCE_TYPE_IRQ)
+			(*resource)->data.irq.descriptor_length =
+					res->data.irq.descriptor_length;
 		(*resource)++;
 	}
 
@@ -800,10 +803,12 @@ static void pnpacpi_encode_irq(struct pn
 	irq->interrupt_count = 1;
 	irq->interrupts[0] = p->start;
 
-	dev_dbg(&dev->dev, "  encode irq %d %s %s %s\n", (int) p->start,
+	dev_dbg(&dev->dev, "  encode irq %d %s %s %s (%d-byte descriptor)\n",
+		(int) p->start,
 		triggering == ACPI_LEVEL_SENSITIVE ? "level" : "edge",
 		polarity == ACPI_ACTIVE_LOW ? "low" : "high",
-		irq->sharable == ACPI_SHARED ? "shared" : "exclusive");
+		irq->sharable == ACPI_SHARED ? "shared" : "exclusive",
+		irq->descriptor_length);
 }
 
 static void pnpacpi_encode_ext_irq(struct pnp_dev *dev,

Re: [patch][resend] provide rtc_cmos platform device, take 2

[Stas Sergeev]

Hello.

Bjorn Helgaas wrote:
> As far as I'm concerned, "pnpacpi=off" should only be used to work
> around defects, so I'd like to fix the defect you're seeing with
> parport_pc.  Is there a bug report for it?
Certainly, and you've seen it many
times. :)
http://bugzilla.kernel.org/show_bug.cgi?id=7491
Its that the module parameters are overriden
by PNP and are ignored, so you can't do
"dma=none" etc.
Your patch is not for that, AFAICS.
Or let me know if it is.

Re: [patch][resend] provide rtc_cmos platform device, take 2

[Bjorn Helgaas]

On Thursday 29 May 2008 10:12:42 pm Stas Sergeev wrote:
> Hello.
> 
> Bjorn Helgaas wrote:
> > As far as I'm concerned, "pnpacpi=off" should only be used to work
> > around defects, so I'd like to fix the defect you're seeing with
> > parport_pc.  Is there a bug report for it?
> Certainly, and you've seen it many
> times. :)
> http://bugzilla.kernel.org/show_bug.cgi?id=7491
> Its that the module parameters are overriden
> by PNP and are ignored, so you can't do
> "dma=none" etc.
> Your patch is not for that, AFAICS.
> Or let me know if it is.

Oh, yeah, that one :-)  No, my patch does nothing for that.

I can't remember why it's so hard to fix that bug.  Maybe now that
we fixed the *other* reason for using "pnpacpi=off", I can take
another look at it and make some progress.  It doesn't *sound* like
it should be hard to fix.

Bjorn

Re: [patch][resend] provide rtc_cmos platform device, take 2

[Ingo Molnar]

* Bjorn Helgaas <bjorn.helgaas@hp.com> wrote:

> Andrew added these patches to his -mm tree, but I don't think he's 
> released a patchset that contains them yet.  I'll attach the patch in 
> case you want to try it.  Let me know what happens.

added your patch to -tip for more testing, to the tip/out-of-tree topic 
branch. It already passed a fair amount of testing here.

	Ingo

Re: [patch][resend] provide rtc_cmos platform device, take 2

[Russell King]

On Wed, May 28, 2008 at 04:36:00PM -0700, Andrew Morton wrote:
> On Tue, 27 May 2008 15:23:06 +0400
> Stas Sergeev <stsp@aknet.ru> wrote:
> 
> > RTC doesn't work with pnpacpi=off.
> > The attached patch fixes the problem by creating the platform device for
> > the RTC when PNP is disabled. This may also help running the PNP-enabled
> > kernel on an older PCs.
> > 
> > Signed-off-by: Stas Sergeev <stsp@aknet.ru>
> > Cc: David Brownell <david-b@pacbell.net>
> > Cc: Ingo Molnar <mingo@elte.hu>
> > Cc: Thomas Gleixner <tglx@linutronix.de>
> > Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
> > Cc: Adam Belay <ambx1@neo.rr.com>
> > CC: Russell King <rmk+lkml@arm.linux.org.uk>
> 
> So is everyone happy with this now?

No idea - I've been away for the last week, and thanks to the extensive
discussions on linux-arch and the private threads, I've now got literally
hundreds of emails to work through.

Plus I'm rather tired today, thanks to power cuts setting off peoples
burgular alarms during last night.  And I'm probably not around much
tomorrow nor Wednesday...

You get the picture - probably about a week or so before I can even get
around to thinking about testing this (or indeed much else.)

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of: