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From 898d0d6483a9360f1968e0a900465c1fa152a4a9 Mon Sep 17 00:00:00 2001
From: Ansuel Smith <ansuelsmth@gmail.com>
Date: Sat, 30 Apr 2022 07:44:58 +0200
Subject: [PATCH 3/3] clk: qcom: clk-krait: add apq/ipq8064 errata workaround
Add apq/ipq8064 errata workaround where the sec_src clock gating needs to
be disabled during switching. krait-cc compatible is not enough to
handle this and limit this workaround to apq/ipq8064. We check machine
compatible to handle this.
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220430054458.31321-4-ansuelsmth@gmail.com
---
drivers/clk/qcom/clk-krait.c | 16 ++++++++++++++++
drivers/clk/qcom/clk-krait.h | 1 +
drivers/clk/qcom/krait-cc.c | 8 ++++++++
3 files changed, 25 insertions(+)
--- a/drivers/clk/qcom/clk-krait.c
+++ b/drivers/clk/qcom/clk-krait.c
@@ -18,13 +18,23 @@
static DEFINE_SPINLOCK(krait_clock_reg_lock);
#define LPL_SHIFT 8
+#define SECCLKAGD BIT(4)
+
static void __krait_mux_set_sel(struct krait_mux_clk *mux, int sel)
{
unsigned long flags;
u32 regval;
spin_lock_irqsave(&krait_clock_reg_lock, flags);
+
regval = krait_get_l2_indirect_reg(mux->offset);
+
+ /* apq/ipq8064 Errata: disable sec_src clock gating during switch. */
+ if (mux->disable_sec_src_gating) {
+ regval |= SECCLKAGD;
+ krait_set_l2_indirect_reg(mux->offset, regval);
+ }
+
regval &= ~(mux->mask << mux->shift);
regval |= (sel & mux->mask) << mux->shift;
if (mux->lpl) {
@@ -33,6 +43,12 @@ static void __krait_mux_set_sel(struct k
}
krait_set_l2_indirect_reg(mux->offset, regval);
+ /* apq/ipq8064 Errata: re-enabled sec_src clock gating. */
+ if (mux->disable_sec_src_gating) {
+ regval &= ~SECCLKAGD;
+ krait_set_l2_indirect_reg(mux->offset, regval);
+ }
+
/* Wait for switch to complete. */
mb();
udelay(1);
--- a/drivers/clk/qcom/clk-krait.h
+++ b/drivers/clk/qcom/clk-krait.h
@@ -15,6 +15,7 @@ struct krait_mux_clk {
u8 safe_sel;
u8 old_index;
bool reparent;
+ bool disable_sec_src_gating;
struct clk_hw hw;
struct notifier_block clk_nb;
--- a/drivers/clk/qcom/krait-cc.c
+++ b/drivers/clk/qcom/krait-cc.c
@@ -139,6 +139,14 @@ krait_add_sec_mux(struct device *dev, in
mux->hw.init = &init;
mux->safe_sel = 0;
+ /* Checking for qcom,krait-cc-v1 or qcom,krait-cc-v2 is not
+ * enough to limit this to apq/ipq8064. Directly check machine
+ * compatible to correctly handle this errata.
+ */
+ if (of_machine_is_compatible("qcom,ipq8064") ||
+ of_machine_is_compatible("qcom,apq8064"))
+ mux->disable_sec_src_gating = true;
+
init.name = kasprintf(GFP_KERNEL, "krait%s_sec_mux", s);
if (!init.name)
return -ENOMEM;
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