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path: root/drivers/clk/ti/dpll3xxx.c
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Diffstat (limited to 'drivers/clk/ti/dpll3xxx.c')
-rw-r--r--drivers/clk/ti/dpll3xxx.c28
1 files changed, 26 insertions, 2 deletions
diff --git a/drivers/clk/ti/dpll3xxx.c b/drivers/clk/ti/dpll3xxx.c
index f4dec00fb..cc739291a 100644
--- a/drivers/clk/ti/dpll3xxx.c
+++ b/drivers/clk/ti/dpll3xxx.c
@@ -305,8 +305,9 @@ static void _lookup_sddiv(struct clk_hw_omap *clk, u8 *sd_div, u16 m, u8 n)
static int omap3_noncore_dpll_program(struct clk_hw_omap *clk, u16 freqsel)
{
struct dpll_data *dd = clk->dpll_data;
- u8 dco, sd_div;
+ u8 dco, sd_div, ai = 0;
u32 v;
+ bool errata_i810;
/* 3430 ES2 TRM: 4.7.6.9 DPLL Programming Sequence */
_omap3_noncore_dpll_bypass(clk);
@@ -350,6 +351,25 @@ static int omap3_noncore_dpll_program(struct clk_hw_omap *clk, u16 freqsel)
v |= sd_div << __ffs(dd->sddiv_mask);
}
+ /*
+ * Errata i810 - DPLL controller can get stuck while transitioning
+ * to a power saving state. Software must ensure the DPLL can not
+ * transition to a low power state while changing M/N values.
+ * Easiest way to accomplish this is to prevent DPLL autoidle
+ * before doing the M/N re-program.
+ */
+ errata_i810 = ti_clk_get_features()->flags & TI_CLK_ERRATA_I810;
+
+ if (errata_i810) {
+ ai = omap3_dpll_autoidle_read(clk);
+ if (ai) {
+ omap3_dpll_deny_idle(clk);
+
+ /* OCP barrier */
+ omap3_dpll_autoidle_read(clk);
+ }
+ }
+
ti_clk_ll_ops->clk_writel(v, dd->mult_div1_reg);
/* Set 4X multiplier and low-power mode */
@@ -379,6 +399,9 @@ static int omap3_noncore_dpll_program(struct clk_hw_omap *clk, u16 freqsel)
_omap3_noncore_dpll_lock(clk);
+ if (errata_i810 && ai)
+ omap3_dpll_allow_idle(clk);
+
return 0;
}
@@ -437,7 +460,8 @@ int omap3_noncore_dpll_enable(struct clk_hw *hw)
parent = clk_hw_get_parent(hw);
- if (clk_hw_get_rate(hw) == clk_get_rate(dd->clk_bypass)) {
+ if (clk_hw_get_rate(hw) ==
+ clk_hw_get_rate(__clk_get_hw(dd->clk_bypass))) {
WARN_ON(parent != __clk_get_hw(dd->clk_bypass));
r = _omap3_noncore_dpll_bypass(clk);
} else {