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[PATCH] powerpc: Fix boot on eMac

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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Prevent calling of some platform functions on the clock chips of the eMac
as it seems to cause it to lockup at boot.  For now, add a quirk to prevent
that from happening.  Later, I might find out what's wrong and fix it but
that doesn't seem to be important as the machine appear to work fine
without running those.  It's possible that Darwin doesn't run them.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Nathan Pilatzke <nathanpilatzke@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Benjamin Herrenschmidt 2006-05-30 21:26:51 -07:00 committed by Linus Torvalds
parent 8d16b76421
commit 5a47d749e3
1 changed files with 12 additions and 0 deletions
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12
arch/powerpc/platforms/powermac/low_i2c.c
View file

@ -1157,6 +1157,7 @@ EXPORT_SYMBOL_GPL(pmac_i2c_xfer);
/* some quirks for platform function decoding */
enum {
pmac_i2c_quirk_invmask = 0x00000001u,
pmac_i2c_quirk_skip = 0x00000002u,
};
static void pmac_i2c_devscan(void (*callback)(struct device_node *dev,
@ -1172,6 +1173,15 @@ static void pmac_i2c_devscan(void (*callback)(struct device_node *dev,
/* XXX Study device-tree's & apple drivers are get the quirks
* right !
*/
/* Workaround: It seems that running the clockspreading
* properties on the eMac will cause lockups during boot.
* The machine seems to work fine without that. So for now,
* let's make sure i2c-hwclock doesn't match about "imic"
* clocks and we'll figure out if we really need to do
* something special about those later.
*/
{ "i2c-hwclock", "imic5002", pmac_i2c_quirk_skip },
{ "i2c-hwclock", "imic5003", pmac_i2c_quirk_skip },
{ "i2c-hwclock", NULL, pmac_i2c_quirk_invmask },
{ "i2c-cpu-voltage", NULL, 0},
{ "temp-monitor", NULL, 0 },
@ -1198,6 +1208,8 @@ static void pmac_i2c_devscan(void (*callback)(struct device_node *dev,
if (p->compatible &&
!device_is_compatible(np, p->compatible))
continue;
if (p->quirks & pmac_i2c_quirk_skip)
break;
callback(np, p->quirks);
break;
}