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| author | Paul Walmsley <paul@pwsan.com> | 2010-02-23 06:09:38 +0100 |
|---|---|---|
| committer | Paul Walmsley <paul@pwsan.com> | 2010-02-25 01:45:16 +0100 |
| commit | 30962d9d0c74f6b00a7dece200fa08392b62817d (patch) | |
| tree | 72c1e60fd4f42c244fb8fe9c68f8e3d95a880edb /arch/arm/mach-omap2/clockdomain.c | |
| parent | OMAP2/3 clock: combine OMAP2 & 3 boot-time MPU rate change code (diff) | |
| download | linux-30962d9d0c74f6b00a7dece200fa08392b62817d.tar.xz linux-30962d9d0c74f6b00a7dece200fa08392b62817d.zip | |
OMAP2+ clock: revise omap2_clk_{disable,enable}()
Simplify the code in the omap2_clk_disable() and omap2_clk_enable()
functions, reducing levels of indentation. This makes the code easier
to read. Add some additional debugging pr_debug()s here also to help
others understand what is going on.
Revise the omap2_clk_disable() logic so that it now attempts to
disable the clock's clockdomain before recursing up the clock tree.
Simultaneously, ensure that omap2_clk_enable() is called on parent
clocks first, before enabling the clockdomain. This ensures that a
parent clock's clockdomain is enabled before the child clock's
clockdomain. These sequences should be the inverse of each other.
Revise the omap2_clk_enable() logic so that it now cleans up after
itself upon encountering an error. Previously, an error enabling a
parent clock could have resulted in inconsistent usecounts on the
enclosing clockdomain.
Remove the trivial _omap2_clk_disable() and _omap2_clk_enable() static
functions, and replace it with the clkops calls that they were
executing.
For all this to work, the clockdomain omap2_clkdm_clk_enable() and
omap2_clkdm_clk_disable() code must not return an error on clockdomains
without CLKSTCTRL registers; so modify those functions to simply return 0
in that case.
While here, add some basic kerneldoc documentation on both functions,
and get rid of some old non-CodingStyle-compliant comments that have
existed since the dawn of time (at least, the OMAP clock framework's
time).
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Richard Woodruff <r-woodruff2@ti.com>
Cc: Rajendra Nayak <rnayak@ti.com>
Diffstat (limited to 'arch/arm/mach-omap2/clockdomain.c')
| -rw-r--r-- | arch/arm/mach-omap2/clockdomain.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/arm/mach-omap2/clockdomain.c b/arch/arm/mach-omap2/clockdomain.c index b26d30a14303..b87ad66f083e 100644 --- a/arch/arm/mach-omap2/clockdomain.c +++ b/arch/arm/mach-omap2/clockdomain.c @@ -978,7 +978,7 @@ int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk) * downstream clocks for debugging purposes? */ - if (!clkdm || !clk || !clkdm->clkstctrl_reg) + if (!clkdm || !clk) return -EINVAL; if (atomic_inc_return(&clkdm->usecount) > 1) @@ -989,6 +989,9 @@ int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk) pr_debug("clockdomain: clkdm %s: clk %s now enabled\n", clkdm->name, clk->name); + if (!clkdm->clkstctrl_reg) + return 0; + v = omap2_clkdm_clktrctrl_read(clkdm); if ((cpu_is_omap34xx() && v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) || @@ -1030,7 +1033,7 @@ int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk) * downstream clocks for debugging purposes? */ - if (!clkdm || !clk || !clkdm->clkstctrl_reg) + if (!clkdm || !clk) return -EINVAL; #ifdef DEBUG @@ -1048,6 +1051,9 @@ int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk) pr_debug("clockdomain: clkdm %s: clk %s now disabled\n", clkdm->name, clk->name); + if (!clkdm->clkstctrl_reg) + return 0; + v = omap2_clkdm_clktrctrl_read(clkdm); if ((cpu_is_omap34xx() && v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) || |