From: Vikram Pandita <vikram.pandita@xxxxxx>
If the dpll is already locked, code can be optimized
to return much earlier than doing redundent set of lock mode
and wait on idlest.
Signed-off-by: Vikram Pandita <vikram.pandita@xxxxxx>
Reviewed-by: Todd Poynor <toddpoynor@xxxxxxxxxx>
---
v1: initial draft
v2: fix review comments
arch/arm/mach-omap2/dpll3xxx.c | 12 +++++++++++-
1 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mach-omap2/dpll3xxx.c b/arch/arm/mach-omap2/dpll3xxx.c
index f77022b..2d4f6bd 100644
--- a/arch/arm/mach-omap2/dpll3xxx.c
+++ b/arch/arm/mach-omap2/dpll3xxx.c
@@ -135,11 +135,20 @@ static u16 _omap3_dpll_compute_freqsel(struct clk *clk, u8 n)
*/
static int _omap3_noncore_dpll_lock(struct clk *clk)
{
+ const struct dpll_data *dd;
u8 ai;
- int r;
+ u8 state = 1;
+ int r = 0;
pr_debug("clock: locking DPLL %s\n", clk->name);
+ dd = clk->dpll_data;
+ state <<= __ffs(dd->idlest_mask);
+
+ /* Check if already locked */
+ if ((__raw_readl(dd->idlest_reg) & dd->idlest_mask) == state)
+ goto done;
+
ai = omap3_dpll_autoidle_read(clk);
omap3_dpll_deny_idle(clk);
@@ -151,6 +160,7 @@ static int _omap3_noncore_dpll_lock(struct clk *clk)
if (ai)
omap3_dpll_allow_idle(clk);
+done:
return r;
}
--
1.7.5.4
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