diff options
Diffstat (limited to 'target/linux/ipq806x/patches-4.14/0044-clk-Add-safe-switch-hook.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-4.14/0044-clk-Add-safe-switch-hook.patch | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/target/linux/ipq806x/patches-4.14/0044-clk-Add-safe-switch-hook.patch b/target/linux/ipq806x/patches-4.14/0044-clk-Add-safe-switch-hook.patch deleted file mode 100644 index d0eddc64c2..0000000000 --- a/target/linux/ipq806x/patches-4.14/0044-clk-Add-safe-switch-hook.patch +++ /dev/null @@ -1,160 +0,0 @@ -From patchwork Fri Dec 8 09:42:28 2017 -Content-Type: text/plain; charset="utf-8" -MIME-Version: 1.0 -Content-Transfer-Encoding: 7bit -Subject: [v4,10/12] clk: qcom: Add safe switch hook for krait mux clocks -From: Sricharan R <sricharan@codeaurora.org> -X-Patchwork-Id: 10102057 -Message-Id: <1512726150-7204-11-git-send-email-sricharan@codeaurora.org> -To: mturquette@baylibre.com, sboyd@codeaurora.org, - devicetree@vger.kernel.org, linux-pm@vger.kernel.org, - linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, - viresh.kumar@linaro.org, linux-arm-kernel@lists.infradead.org -Cc: sricharan@codeaurora.org -Date: Fri, 8 Dec 2017 15:12:28 +0530 - -When the Hfplls are reprogrammed during the rate change, -the primary muxes which are sourced from the same hfpll -for higher frequencies, needs to be switched to the 'safe -secondary mux' as the parent for that small window. This -is done by registering a clk notifier for the muxes and -switching to the safe parent in the PRE_RATE_CHANGE notifier -and back to the original parent in the POST_RATE_CHANGE notifier. - -Signed-off-by: Sricharan R <sricharan@codeaurora.org> ---- - drivers/clk/qcom/clk-krait.c | 2 ++ - drivers/clk/qcom/clk-krait.h | 3 +++ - drivers/clk/qcom/krait-cc.c | 56 ++++++++++++++++++++++++++++++++++++++++++++ - 3 files changed, 61 insertions(+) - ---- a/drivers/clk/qcom/clk-krait.c -+++ b/drivers/clk/qcom/clk-krait.c -@@ -60,6 +60,8 @@ static int krait_mux_set_parent(struct c - if (__clk_is_enabled(hw->clk)) - __krait_mux_set_sel(mux, sel); - -+ mux->reparent = true; -+ - return 0; - } - ---- a/drivers/clk/qcom/clk-krait.h -+++ b/drivers/clk/qcom/clk-krait.h -@@ -23,6 +23,9 @@ struct krait_mux_clk { - u32 shift; - u32 en_mask; - bool lpl; -+ u8 safe_sel; -+ u8 old_index; -+ bool reparent; - - struct clk_hw hw; - struct notifier_block clk_nb; ---- a/drivers/clk/qcom/krait-cc.c -+++ b/drivers/clk/qcom/krait-cc.c -@@ -35,6 +35,49 @@ static unsigned int pri_mux_map[] = { - 0, - }; - -+/* -+ * Notifier function for switching the muxes to safe parent -+ * while the hfpll is getting reprogrammed. -+ */ -+static int krait_notifier_cb(struct notifier_block *nb, -+ unsigned long event, -+ void *data) -+{ -+ int ret = 0; -+ struct krait_mux_clk *mux = container_of(nb, struct krait_mux_clk, -+ clk_nb); -+ /* Switch to safe parent */ -+ if (event == PRE_RATE_CHANGE) { -+ mux->old_index = krait_mux_clk_ops.get_parent(&mux->hw); -+ ret = krait_mux_clk_ops.set_parent(&mux->hw, mux->safe_sel); -+ mux->reparent = false; -+ /* -+ * By the time POST_RATE_CHANGE notifier is called, -+ * clk framework itself would have changed the parent for the new rate. -+ * Only otherwise, put back to the old parent. -+ */ -+ } else if (event == POST_RATE_CHANGE) { -+ if (!mux->reparent) -+ ret = krait_mux_clk_ops.set_parent(&mux->hw, -+ mux->old_index); -+ } -+ -+ return notifier_from_errno(ret); -+} -+ -+static int krait_notifier_register(struct device *dev, struct clk *clk, -+ struct krait_mux_clk *mux) -+{ -+ int ret = 0; -+ -+ mux->clk_nb.notifier_call = krait_notifier_cb; -+ ret = clk_notifier_register(clk, &mux->clk_nb); -+ if (ret) -+ dev_err(dev, "failed to register clock notifier: %d\n", ret); -+ -+ return ret; -+} -+ - static int - krait_add_div(struct device *dev, int id, const char *s, unsigned int offset) - { -@@ -79,6 +122,7 @@ static int - krait_add_sec_mux(struct device *dev, int id, const char *s, - unsigned int offset, bool unique_aux) - { -+ int ret; - struct krait_mux_clk *mux; - static const char *sec_mux_list[] = { - "acpu_aux", -@@ -102,6 +146,7 @@ krait_add_sec_mux(struct device *dev, in - mux->shift = 2; - mux->parent_map = sec_mux_map; - mux->hw.init = &init; -+ mux->safe_sel = 0; - - init.name = kasprintf(GFP_KERNEL, "krait%s_sec_mux", s); - if (!init.name) -@@ -117,6 +162,11 @@ krait_add_sec_mux(struct device *dev, in - - clk = devm_clk_register(dev, &mux->hw); - -+ ret = krait_notifier_register(dev, clk, mux); -+ if (ret) -+ goto unique_aux; -+ -+unique_aux: - if (unique_aux) - kfree(sec_mux_list[0]); - err_aux: -@@ -128,6 +178,7 @@ static struct clk * - krait_add_pri_mux(struct device *dev, int id, const char *s, - unsigned int offset) - { -+ int ret; - struct krait_mux_clk *mux; - const char *p_names[3]; - struct clk_init_data init = { -@@ -148,6 +199,7 @@ krait_add_pri_mux(struct device *dev, in - mux->lpl = id >= 0; - mux->parent_map = pri_mux_map; - mux->hw.init = &init; -+ mux->safe_sel = 2; - - init.name = kasprintf(GFP_KERNEL, "krait%s_pri_mux", s); - if (!init.name) -@@ -173,6 +225,10 @@ krait_add_pri_mux(struct device *dev, in - - clk = devm_clk_register(dev, &mux->hw); - -+ ret = krait_notifier_register(dev, clk, mux); -+ if (ret) -+ goto err_p3; -+err_p3: - kfree(p_names[2]); - err_p2: - kfree(p_names[1]); |