diff options
| author |   Vikram Pandita <vikram.pandita@ti.com> | 2012-07-04 05:00:44 -0600 |
|---|---|---|
| committer |   Paul Walmsley <paul@pwsan.com> | 2012-07-04 05:00:44 -0600 |
| commit | 55ffe163c8b4e2aa0a083000e02ec26efd71ea63 (patch) | |
| tree | f0135662556a2b259654b9837d7ffd7ec8268d8e /arch/arm/mach-omap2/dpll3xxx.c | |
| parent | ARM: OMAP3: control: add definition for CONTROL_CAMERA_PHY_CTRL (diff) | |
| download | linux-dev-55ffe163c8b4e2aa0a083000e02ec26efd71ea63.tar.xz linux-dev-55ffe163c8b4e2aa0a083000e02ec26efd71ea63.zip | |
ARM: OMAP3+: dpll: optimize noncore dpll locking logic
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.
Cc: Tony Lindgren <tony@atomide.com>
Cc: Jon Hunter <jon-hunter@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Mike Turquette <mturquette@ti.com>
Signed-off-by: Vikram Pandita <vikram.pandita@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch/arm/mach-omap2/dpll3xxx.c')
| -rw-r--r-- | 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 f0f10beeffe8..c310dc0d40b4 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); if (ai) @@ -152,6 +161,7 @@ static int _omap3_noncore_dpll_lock(struct clk *clk) if (ai) omap3_dpll_allow_idle(clk); +done: return r; } |