msm: clock: Move voltage scaling to prepare/unprepare
Move the voltage calls to a sleepable context so we can avoid
spinning for hundreds of microseconds with interrupts disabled
waiting for a regulator to increase. This change also paves the
way to making the clock driver into a real regulator consumer
that uses the proper regulator APIs instead of the MSM specific
rpm_vreg API.
Doing this also requires us to make clk_set_rate() a sleeping
call so that concurrent clk_prepare() and clk_set_rate() calls
are synchronized. Making clk_set_rate() sleepable also
necessitates moving the clk_set_rate() call in clock-voter.c to a
sleepable context. Do that by having clock-voter aggregate and
update the rate in prepare/unprepare instead of enable/disable
(note that enable/disable of voter clocks implicitly calls
enable/disable on the parent via generic clock code).
Now that clk_set_rate() is sleeping, call clk_prepare() and
clk_unprepare() in the clock-local code when a rate change
requires reparenting the clock. This cleans up a problem we have
where sources may be left unprepared by a clock rate switch
(hence the default true warned flag for PLLs and crystals).
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
(cherry picked from commit d86d1f2d968f194e3db46bb683e370a9fa3a6037)
Conflicts:
arch/arm/mach-msm/clock-local2.c
Change-Id: Ie5bbb17537d5b33de92f8ea1c2da6070b18c14f1
Signed-off-by: Sudhir Sharma <sudsha@codeaurora.org>
diff --git a/arch/arm/mach-msm/clock-local.h b/arch/arm/mach-msm/clock-local.h
index 034e09c..81085ef 100644
--- a/arch/arm/mach-msm/clock-local.h
+++ b/arch/arm/mach-msm/clock-local.h
@@ -164,6 +164,7 @@
* Generic clock-definition struct and macros
*/
struct rcg_clk {
+ bool prepared;
bool enabled;
void *const ns_reg;
void *const md_reg;