diff options
Diffstat (limited to 'target/linux/ipq806x/patches-4.9/0037-clk-Add-safe-switch-hook.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-4.9/0037-clk-Add-safe-switch-hook.patch | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/target/linux/ipq806x/patches-4.9/0037-clk-Add-safe-switch-hook.patch b/target/linux/ipq806x/patches-4.9/0037-clk-Add-safe-switch-hook.patch deleted file mode 100644 index bff605f8de..0000000000 --- a/target/linux/ipq806x/patches-4.9/0037-clk-Add-safe-switch-hook.patch +++ /dev/null @@ -1,158 +0,0 @@ -From a1adfb782789ae9b25c928dfe3d639288563a86c Mon Sep 17 00:00:00 2001 -From: Stephen Boyd <sboyd@codeaurora.org> -Date: Fri, 20 Mar 2015 23:45:23 -0700 -Subject: [PATCH 37/69] clk: Add safe switch hook - -Sometimes clocks can't accept their parent source turning off -while the source is reprogrammed to a different rate. Most -notably CPU clocks require a way to switch away from the current -PLL they're running on, reprogram that PLL to a new rate, and -then switch back to the PLL with the new rate once they're done. -Add a hook that drivers can implement allowing them to return a -'safe parent' and 'safe frequency' that they can switch their -parent to while the upstream source is reprogrammed to support -this. - -Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> -Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> ---- - drivers/clk/clk.c | 73 +++++++++++++++++++++++++++++++++++++++++--- - include/linux/clk-provider.h | 2 ++ - 2 files changed, 70 insertions(+), 5 deletions(-) - ---- a/drivers/clk/clk.c -+++ b/drivers/clk/clk.c -@@ -51,9 +51,13 @@ struct clk_core { - struct clk_core **parents; - u8 num_parents; - u8 new_parent_index; -+ u8 safe_parent_index; - unsigned long rate; - unsigned long req_rate; -+ unsigned long old_rate; - unsigned long new_rate; -+ unsigned long safe_freq; -+ struct clk_core *safe_parent; - struct clk_core *new_parent; - struct clk_core *new_child; - unsigned long flags; -@@ -1310,7 +1314,9 @@ out: - static void clk_calc_subtree(struct clk_core *core, unsigned long new_rate, - struct clk_core *new_parent, u8 p_index) - { -- struct clk_core *child; -+ struct clk_core *child, *parent; -+ struct clk_hw *parent_hw; -+ unsigned long safe_freq = 0; - - core->new_rate = new_rate; - core->new_parent = new_parent; -@@ -1320,6 +1326,23 @@ static void clk_calc_subtree(struct clk_ - if (new_parent && new_parent != core->parent) - new_parent->new_child = core; - -+ if (core->ops->get_safe_parent) { -+ parent_hw = core->ops->get_safe_parent(core->hw, &safe_freq); -+ if (parent_hw) { -+ parent = parent_hw->core; -+ p_index = clk_fetch_parent_index(core, parent); -+ core->safe_parent_index = p_index; -+ core->safe_parent = parent; -+ if (safe_freq) -+ core->safe_freq = safe_freq; -+ else -+ core->safe_freq = 0; -+ } -+ } else { -+ core->safe_parent = NULL; -+ core->safe_freq = 0; -+ } -+ - hlist_for_each_entry(child, &core->children, child_node) { - child->new_rate = clk_recalc(child, new_rate); - clk_calc_subtree(child, child->new_rate, NULL, 0); -@@ -1432,14 +1455,51 @@ static struct clk_core *clk_propagate_ra - unsigned long event) - { - struct clk_core *child, *tmp_clk, *fail_clk = NULL; -+ struct clk_core *old_parent; - int ret = NOTIFY_DONE; - -- if (core->rate == core->new_rate) -+ if (core->rate == core->new_rate && event != POST_RATE_CHANGE) - return NULL; - -+ switch (event) { -+ case PRE_RATE_CHANGE: -+ if (core->safe_parent) { -+ if (core->safe_freq) -+ core->ops->set_rate_and_parent(core->hw, -+ core->safe_freq, -+ core->safe_parent->rate, -+ core->safe_parent_index); -+ else -+ core->ops->set_parent(core->hw, -+ core->safe_parent_index); -+ } -+ core->old_rate = core->rate; -+ break; -+ case POST_RATE_CHANGE: -+ if (core->safe_parent) { -+ old_parent = __clk_set_parent_before(core, -+ core->new_parent); -+ if (core->ops->set_rate_and_parent) { -+ core->ops->set_rate_and_parent(core->hw, -+ core->new_rate, -+ core->new_parent ? -+ core->new_parent->rate : 0, -+ core->new_parent_index); -+ } else if (core->ops->set_parent) { -+ core->ops->set_parent(core->hw, -+ core->new_parent_index); -+ } -+ __clk_set_parent_after(core, core->new_parent, -+ old_parent); -+ } -+ break; -+ } -+ - if (core->notifier_count) { -- ret = __clk_notify(core, event, core->rate, core->new_rate); -- if (ret & NOTIFY_STOP_MASK) -+ if (event != POST_RATE_CHANGE || core->old_rate != core->rate) -+ ret = __clk_notify(core, event, core->old_rate, -+ core->new_rate); -+ if (ret & NOTIFY_STOP_MASK && event != POST_RATE_CHANGE) - fail_clk = core; - } - -@@ -1495,7 +1555,8 @@ clk_change_rate(struct clk_core *core, u - clk_enable_unlock(flags); - } - -- if (core->new_parent && core->new_parent != core->parent) { -+ if (core->new_parent && core->new_parent != core->parent && -+ !core->safe_parent) { - old_parent = __clk_set_parent_before(core, core->new_parent); - trace_clk_set_parent(core, core->new_parent); - -@@ -1601,6 +1662,8 @@ static int clk_core_set_rate_nolock(stru - - core->req_rate = req_rate; - -+ clk_propagate_rate_change(top, POST_RATE_CHANGE); -+ - return 0; - } - ---- a/include/linux/clk-provider.h -+++ b/include/linux/clk-provider.h -@@ -206,6 +206,8 @@ struct clk_ops { - struct clk_rate_request *req); - int (*set_parent)(struct clk_hw *hw, u8 index); - u8 (*get_parent)(struct clk_hw *hw); -+ struct clk_hw *(*get_safe_parent)(struct clk_hw *hw, -+ unsigned long *safe_freq); - int (*set_rate)(struct clk_hw *hw, unsigned long rate, - unsigned long parent_rate); - int (*set_rate_and_parent)(struct clk_hw *hw, |