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ARM: OMAP3+: dpll: Configure autoidle mode only if it's supported

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The current DPLL code enables and disables autoidle features
without checking whether the autoidle register is available.
Fix this by putting a check for the existence of the autoidle
register in the DPLL data.

With such a check in place, for DPLLs which do not support this
feature, simply skipping the autoidle_reg entry in the DPLL data
is sufficient.

Signed-off-by: Vaibhav Bedia <vaibhav.bedia@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Vaibhav Bedia 2012-05-07 23:55:30 -06:00 committed by Paul Walmsley
parent f1bbbb1365
commit d76316fef3
1 changed files with 18 additions and 5 deletions
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23
arch/arm/mach-omap2/dpll3xxx.c
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@ -142,7 +142,8 @@ static int _omap3_noncore_dpll_lock(struct clk *clk)
ai = omap3_dpll_autoidle_read(clk);
omap3_dpll_deny_idle(clk);
if (ai)
omap3_dpll_deny_idle(clk);
_omap3_dpll_write_clken(clk, DPLL_LOCKED);
@ -186,8 +187,6 @@ static int _omap3_noncore_dpll_bypass(struct clk *clk)
if (ai)
omap3_dpll_allow_idle(clk);
else
omap3_dpll_deny_idle(clk);
return r;
}
@ -216,8 +215,6 @@ static int _omap3_noncore_dpll_stop(struct clk *clk)
if (ai)
omap3_dpll_allow_idle(clk);
else
omap3_dpll_deny_idle(clk);
return 0;
}
@ -519,6 +516,9 @@ u32 omap3_dpll_autoidle_read(struct clk *clk)
dd = clk->dpll_data;
if (!dd->autoidle_reg)
return -EINVAL;
v = __raw_readl(dd->autoidle_reg);
v &= dd->autoidle_mask;
v >>= __ffs(dd->autoidle_mask);
@ -545,6 +545,12 @@ void omap3_dpll_allow_idle(struct clk *clk)
dd = clk->dpll_data;
if (!dd->autoidle_reg) {
pr_debug("clock: DPLL %s: autoidle not supported\n",
clk->name);
return;
}
/*
* REVISIT: CORE DPLL can optionally enter low-power bypass
* by writing 0x5 instead of 0x1. Add some mechanism to
@ -554,6 +560,7 @@ void omap3_dpll_allow_idle(struct clk *clk)
v &= ~dd->autoidle_mask;
v |= DPLL_AUTOIDLE_LOW_POWER_STOP << __ffs(dd->autoidle_mask);
__raw_writel(v, dd->autoidle_reg);
}
/**
@ -572,6 +579,12 @@ void omap3_dpll_deny_idle(struct clk *clk)
dd = clk->dpll_data;
if (!dd->autoidle_reg) {
pr_debug("clock: DPLL %s: autoidle not supported\n",
clk->name);
return;
}
v = __raw_readl(dd->autoidle_reg);
v &= ~dd->autoidle_mask;
v |= DPLL_AUTOIDLE_DISABLE << __ffs(dd->autoidle_mask);