ARM: OMAP3+: dpll: Configure autoidle mode only if it's supported
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>
diff --git a/arch/arm/mach-omap2/dpll3xxx.c b/arch/arm/mach-omap2/dpll3xxx.c
index fc56745..f0f10be 100644
--- a/arch/arm/mach-omap2/dpll3xxx.c
+++ b/arch/arm/mach-omap2/dpll3xxx.c
@@ -142,7 +142,8 @@
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 @@
if (ai)
omap3_dpll_allow_idle(clk);
- else
- omap3_dpll_deny_idle(clk);
return r;
}
@@ -216,8 +215,6 @@
if (ai)
omap3_dpll_allow_idle(clk);
- else
- omap3_dpll_deny_idle(clk);
return 0;
}
@@ -519,6 +516,9 @@
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 @@
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 @@
v &= ~dd->autoidle_mask;
v |= DPLL_AUTOIDLE_LOW_POWER_STOP << __ffs(dd->autoidle_mask);
__raw_writel(v, dd->autoidle_reg);
+
}
/**
@@ -572,6 +579,12 @@
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);