On Mon, Jan 06, 2014 at 09:50:42PM +0100, Stephen Warren wrote:

On 12/24/2013 06:32 AM, Peter De Schrijver wrote:

quoted

Reduce fuse.c to the minimum functionality required for the early bootstages.

Also export tegra_read_straps() for use by the fuse driver.

Since the fuse driver is tristate, it could be a module. Doesn't it
literally need to be EXPORT_SYMBOL'd, not simply not static?

Good point.

I'm rather worried that this series isn't bisectable, since this patch
removes a bunch of code that's replaced by code in the fuse driver which
can't be built/linked at this point in the series. I'm also worried
about initialization ordering, since a lot of the fuse code could be a
module...

Maybe it should indeed never be a module...

quoted

diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c

quoted

-/* Tegra20 only */
 #define FUSE_UID_LOW		0x108
 #define FUSE_UID_HIGH		0x10c

Why remove that comment but leave the two defines it applies to?

quoted

 #define TEGRA20_FUSE_SPARE_BIT		0x200

That define, and tegra_spare_fuse() which uses it, are no longer used
after patch 5/6, but aren't removed in patch 5/6. Perhaps it'd be better
to squash or re-order the two patches, so this dead code can be removed?

quoted

-int tegra_sku_id;
-int tegra_cpu_process_id;
-int tegra_core_process_id;
 int tegra_chip_id;
-int tegra_cpu_speedo_id;		/* only exist in Tegra30 and later */
-int tegra_soc_speedo_id;
 enum tegra_revision tegra_revision;

It's a bit odd to remove most of this, but leave a few parts hanging
around. Wouldn't it be better to the drivers/misc/fuse code to export
this, so that /all/ the fuse logic was there, rather than part of it
being left over in arch/arm/? We'll need to fix that up anyway when we
start using these globals on ARMv8, so may as well get it right now.
Also, I rather think that the new drivers/misc/fuse code shouldn't be a
module or driver, so that we can guarantee it's always there to provide
the globals and that they are initialized early enough...

tegra_revision is used in tegra_dt_init() to initialize soc_dev_attr->revision
Hence this needs to be available before the fuse driver is initialized.

Cheers,

Peter.