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ARM: OMAP: hwmod: revise deassert sequence 

For a reset sequence to complete cleanly, a module needs its
associated clocks to be enabled, otherwise the timeout check
in prcm code can print a false failure (failed to hardreset)
that occurs because the clocks aren't powered ON and the status
bit checked can't transition without them.

Signed-off-by: Omar Ramirez Luna <omar.luna@linaro.org>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Omar Ramirez Luna 2012-09-23 17:28:21 -06:00 committed by Paul Walmsley
parent eb05f69129
commit e8e96dff71
1 changed files with 37 additions and 0 deletions
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37
arch/arm/mach-omap2/omap_hwmod.c
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@ -1585,6 +1585,7 @@ static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
{
struct omap_hwmod_rst_info ohri;
int ret = -EINVAL;
int hwsup = 0;
if (!oh)
return -EINVAL;
@ -1596,10 +1597,46 @@ static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
if (IS_ERR_VALUE(ret))
return ret;
if (oh->clkdm) {
/*
* A clockdomain must be in SW_SUP otherwise reset
* might not be completed. The clockdomain can be set
* in HW_AUTO only when the module become ready.
*/
hwsup = clkdm_in_hwsup(oh->clkdm);
ret = clkdm_hwmod_enable(oh->clkdm, oh);
if (ret) {
WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
oh->name, oh->clkdm->name, ret);
return ret;
}
}
_enable_clocks(oh);
if (soc_ops.enable_module)
soc_ops.enable_module(oh);
ret = soc_ops.deassert_hardreset(oh, &ohri);
if (soc_ops.disable_module)
soc_ops.disable_module(oh);
_disable_clocks(oh);
if (ret == -EBUSY)
pr_warning("omap_hwmod: %s: failed to hardreset\n", oh->name);
if (!ret) {
/*
* Set the clockdomain to HW_AUTO, assuming that the
* previous state was HW_AUTO.
*/
if (oh->clkdm && hwsup)
clkdm_allow_idle(oh->clkdm);
} else {
if (oh->clkdm)
clkdm_hwmod_disable(oh->clkdm, oh);
}
return ret;
}