From 46cecfd6d727f398b568080655a77ea07308053b Mon Sep 17 00:00:00 2001 From: John Crispin Date: Tue, 7 Jun 2016 20:33:35 +0200 Subject: ipg806x: set v4.4 as default Signed-off-by: John Crispin --- .../136-clk-Add-safe-switch-hook.patch | 170 --------------------- 1 file changed, 170 deletions(-) delete mode 100644 target/linux/ipq806x/patches-3.18/136-clk-Add-safe-switch-hook.patch (limited to 'target/linux/ipq806x/patches-3.18/136-clk-Add-safe-switch-hook.patch') diff --git a/target/linux/ipq806x/patches-3.18/136-clk-Add-safe-switch-hook.patch b/target/linux/ipq806x/patches-3.18/136-clk-Add-safe-switch-hook.patch deleted file mode 100644 index 227f8cea05..0000000000 --- a/target/linux/ipq806x/patches-3.18/136-clk-Add-safe-switch-hook.patch +++ /dev/null @@ -1,170 +0,0 @@ -Content-Type: text/plain; charset="utf-8" -MIME-Version: 1.0 -Content-Transfer-Encoding: 7bit -Subject: [v3,04/13] clk: Add safe switch hook -From: Stephen Boyd -X-Patchwork-Id: 6063211 -Message-Id: <1426920332-9340-5-git-send-email-sboyd@codeaurora.org> -To: Mike Turquette , Stephen Boyd -Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, - linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, - Viresh Kumar -Date: Fri, 20 Mar 2015 23:45:23 -0700 - -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' that they can switch their parent to while the -upstream source is reprogrammed to support this. - -Signed-off-by: Stephen Boyd - ---- -This patch is good enough for Krait, but soon I'll need to -support a "safe rate" where we ask a clock what rate it needs to be running -at to be sure it's within voltage constraints. Right now safe parent -handles that problem on Krait, but on other platforms it won't work. - - drivers/clk/clk.c | 61 ++++++++++++++++++++++++++++++++++++++------ - include/linux/clk-provider.h | 1 + - 2 files changed, 54 insertions(+), 8 deletions(-) - ---- a/drivers/clk/clk.c -+++ b/drivers/clk/clk.c -@@ -1350,7 +1350,8 @@ out: - static void clk_calc_subtree(struct clk *clk, unsigned long new_rate, - struct clk *new_parent, u8 p_index) - { -- struct clk *child; -+ struct clk *child, *parent; -+ struct clk_hw *parent_hw; - - clk->new_rate = new_rate; - clk->new_parent = new_parent; -@@ -1360,6 +1361,18 @@ static void clk_calc_subtree(struct clk - if (new_parent && new_parent != clk->parent) - new_parent->new_child = clk; - -+ if (clk->ops->get_safe_parent) { -+ parent_hw = clk->ops->get_safe_parent(clk->hw); -+ if (parent_hw) { -+ parent = parent_hw->clk; -+ p_index = clk_fetch_parent_index(clk, parent); -+ clk->safe_parent_index = p_index; -+ clk->safe_parent = parent; -+ } -+ } else { -+ clk->safe_parent = NULL; -+ } -+ - hlist_for_each_entry(child, &clk->children, child_node) { - child->new_rate = clk_recalc(child, new_rate); - clk_calc_subtree(child, child->new_rate, NULL, 0); -@@ -1439,17 +1452,47 @@ out: - * so that in case of an error we can walk down the whole tree again and - * abort the change. - */ --static struct clk *clk_propagate_rate_change(struct clk *clk, unsigned long event) -+static struct clk *clk_propagate_rate_change(struct clk *clk, -+ unsigned long event) - { - struct clk *child, *tmp_clk, *fail_clk = NULL; -+ struct clk *old_parent; - int ret = NOTIFY_DONE; - -- if (clk->rate == clk->new_rate) -+ if (clk->rate == clk->new_rate && event != POST_RATE_CHANGE) - return NULL; - -+ switch (event) { -+ case PRE_RATE_CHANGE: -+ if (clk->safe_parent) -+ clk->ops->set_parent(clk->hw, clk->safe_parent_index); -+ clk->old_rate = clk->rate; -+ break; -+ case POST_RATE_CHANGE: -+ if (clk->safe_parent) { -+ old_parent = __clk_set_parent_before(clk, -+ clk->new_parent); -+ if (clk->ops->set_rate_and_parent) { -+ clk->ops->set_rate_and_parent(clk->hw, -+ clk->new_rate, -+ clk->new_parent ? -+ clk->new_parent->rate : 0, -+ clk->new_parent_index); -+ } else if (clk->ops->set_parent) { -+ clk->ops->set_parent(clk->hw, -+ clk->new_parent_index); -+ } -+ __clk_set_parent_after(clk, clk->new_parent, -+ old_parent); -+ } -+ break; -+ } -+ - if (clk->notifier_count) { -- ret = __clk_notify(clk, event, clk->rate, clk->new_rate); -- if (ret & NOTIFY_STOP_MASK) -+ if (event != POST_RATE_CHANGE || clk->old_rate != clk->rate) -+ ret = __clk_notify(clk, event, clk->old_rate, -+ clk->new_rate); -+ if (ret & NOTIFY_STOP_MASK && event != POST_RATE_CHANGE) - fail_clk = clk; - } - -@@ -1494,7 +1537,8 @@ static void clk_change_rate(struct clk * - - old_rate = clk->rate; - -- if (clk->new_parent && clk->new_parent != clk->parent) { -+ if (clk->new_parent && clk->new_parent != clk->parent && -+ !clk->safe_parent) { - old_parent = __clk_set_parent_before(clk, clk->new_parent); - - if (clk->ops->set_rate_and_parent) { -@@ -1514,9 +1558,6 @@ static void clk_change_rate(struct clk * - - clk->rate = clk->new_rate; - -- if (clk->notifier_count && old_rate != clk->rate) -- __clk_notify(clk, POST_RATE_CHANGE, old_rate, clk->rate); -- - /* - * Use safe iteration, as change_rate can actually swap parents - * for certain clock types. -@@ -1601,6 +1642,8 @@ int clk_set_rate(struct clk *clk, unsign - /* change the rates */ - clk_change_rate(top, parent_rate); - -+ clk_propagate_rate_change(top, POST_RATE_CHANGE); -+ - out: - clk_prepare_unlock(); - ---- a/include/linux/clk-provider.h -+++ b/include/linux/clk-provider.h -@@ -179,6 +179,7 @@ struct clk_ops { - struct clk **best_parent_clk); - 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); - int (*set_rate)(struct clk_hw *hw, unsigned long rate, - unsigned long parent_rate); - int (*set_rate_and_parent)(struct clk_hw *hw, ---- a/include/linux/clk-private.h -+++ b/include/linux/clk-private.h -@@ -38,8 +38,11 @@ struct clk { - struct clk **parents; - u8 num_parents; - u8 new_parent_index; -+ u8 safe_parent_index; - unsigned long rate; -+ unsigned long old_rate; - unsigned long new_rate; -+ struct clk *safe_parent; - struct clk *new_parent; - struct clk *new_child; - unsigned long flags; -- cgit v1.2.3