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authorJerome Brunet <jbrunet@baylibre.com>2017-12-02 00:51:54 +0300
committerMichael Turquette <mturquette@baylibre.com>2017-12-20 03:17:43 +0300
commit0f6cc2b8e94da5400528c0ba7fd910392ec598a2 (patch)
tree3f2f13854af4eeb7875dacc4d4d62acb4641cfea /drivers/clk/clk.c
parent9e4d04adeb1a957be212aace20ac5cee6f14013c (diff)
downloadlinux-0f6cc2b8e94da5400528c0ba7fd910392ec598a2.tar.xz
clk: rework calls to round and determine rate callbacks
Rework the way the callbacks round_rate() and determine_rate() are called. The goal is to do this at a single point and make it easier to add conditions before calling them. Because of this factorization, rate returned by determine_rate() is also checked against the min and max rate values This rework is done to ease the integration of "protected" clock functionality. Acked-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Quentin Schulz <quentin.schulz@free-electrons.com> Tested-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Michael Turquette <mturquette@baylibre.com> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Michael Turquette <mturquette@baylibre.com> Link: lkml.kernel.org/r/20171201215200.23523-5-jbrunet@baylibre.com
Diffstat (limited to 'drivers/clk/clk.c')
-rw-r--r--drivers/clk/clk.c82
1 files changed, 52 insertions, 30 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 7946a069ba2e..322d9ba7e5cd 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -905,10 +905,9 @@ static int clk_disable_unused(void)
}
late_initcall_sync(clk_disable_unused);
-static int clk_core_round_rate_nolock(struct clk_core *core,
- struct clk_rate_request *req)
+static int clk_core_determine_round_nolock(struct clk_core *core,
+ struct clk_rate_request *req)
{
- struct clk_core *parent;
long rate;
lockdep_assert_held(&prepare_lock);
@@ -916,15 +915,6 @@ static int clk_core_round_rate_nolock(struct clk_core *core,
if (!core)
return 0;
- parent = core->parent;
- if (parent) {
- req->best_parent_hw = parent->hw;
- req->best_parent_rate = parent->rate;
- } else {
- req->best_parent_hw = NULL;
- req->best_parent_rate = 0;
- }
-
if (core->ops->determine_rate) {
return core->ops->determine_rate(core->hw, req);
} else if (core->ops->round_rate) {
@@ -934,15 +924,58 @@ static int clk_core_round_rate_nolock(struct clk_core *core,
return rate;
req->rate = rate;
- } else if (core->flags & CLK_SET_RATE_PARENT) {
- return clk_core_round_rate_nolock(parent, req);
} else {
- req->rate = core->rate;
+ return -EINVAL;
}
return 0;
}
+static void clk_core_init_rate_req(struct clk_core * const core,
+ struct clk_rate_request *req)
+{
+ struct clk_core *parent;
+
+ if (WARN_ON(!core || !req))
+ return;
+
+ parent = core->parent;
+ if (parent) {
+ req->best_parent_hw = parent->hw;
+ req->best_parent_rate = parent->rate;
+ } else {
+ req->best_parent_hw = NULL;
+ req->best_parent_rate = 0;
+ }
+}
+
+static bool clk_core_can_round(struct clk_core * const core)
+{
+ if (core->ops->determine_rate || core->ops->round_rate)
+ return true;
+
+ return false;
+}
+
+static int clk_core_round_rate_nolock(struct clk_core *core,
+ struct clk_rate_request *req)
+{
+ lockdep_assert_held(&prepare_lock);
+
+ if (!core)
+ return 0;
+
+ clk_core_init_rate_req(core, req);
+
+ if (clk_core_can_round(core))
+ return clk_core_determine_round_nolock(core, req);
+ else if (core->flags & CLK_SET_RATE_PARENT)
+ return clk_core_round_rate_nolock(core->parent, req);
+
+ req->rate = core->rate;
+ return 0;
+}
+
/**
* __clk_determine_rate - get the closest rate actually supported by a clock
* @hw: determine the rate of this clock
@@ -1432,34 +1465,23 @@ static struct clk_core *clk_calc_new_rates(struct clk_core *core,
clk_core_get_boundaries(core, &min_rate, &max_rate);
/* find the closest rate and parent clk/rate */
- if (core->ops->determine_rate) {
+ if (clk_core_can_round(core)) {
struct clk_rate_request req;
req.rate = rate;
req.min_rate = min_rate;
req.max_rate = max_rate;
- if (parent) {
- req.best_parent_hw = parent->hw;
- req.best_parent_rate = parent->rate;
- } else {
- req.best_parent_hw = NULL;
- req.best_parent_rate = 0;
- }
- ret = core->ops->determine_rate(core->hw, &req);
+ clk_core_init_rate_req(core, &req);
+
+ ret = clk_core_determine_round_nolock(core, &req);
if (ret < 0)
return NULL;
best_parent_rate = req.best_parent_rate;
new_rate = req.rate;
parent = req.best_parent_hw ? req.best_parent_hw->core : NULL;
- } else if (core->ops->round_rate) {
- ret = core->ops->round_rate(core->hw, rate,
- &best_parent_rate);
- if (ret < 0)
- return NULL;
- new_rate = ret;
if (new_rate < min_rate || new_rate > max_rate)
return NULL;
} else if (!parent || !(core->flags & CLK_SET_RATE_PARENT)) {