clk: qcom: Properly change rates for ahbix clock

The ahbix clock can never be turned off in practice. To change the
rates we need to switch the mux off the M/N counter to an always on
source (XO), reprogram the M/N counter to get the rate we want and
finally switch back to the M/N counter. Add a new ops structure
for this type of clock so that we can set the rate properly.

Fixes: c99e515a92e9 "clk: qcom: Add IPQ806X LPASS clock controller (LCC) driver"
Tested-by: Kenneth Westfield <kwestfie@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

3 files changed, 65 insertions, 3 deletions

diff --git a/drivers/clk/qcom/clk-rcg.c b/drivers/clk/qcom/clk-rcg.c
index 0039bd7d3965..466f30ca65c2 100644
--- a/drivers/clk/qcom/clk-rcg.c
+++ b/drivers/clk/qcom/clk-rcg.c
@@ -495,6 +495,57 @@ static int clk_rcg_bypass_set_rate(struct clk_hw *hw, unsigned long rate,
         return __clk_rcg_set_rate(rcg, rcg->freq_tbl);
 }
 
+/*
+ * This type of clock has a glitch-free mux that switches between the output of
+ * the M/N counter and an always on clock source (XO). When clk_set_rate() is
+ * called we need to make sure that we don't switch to the M/N counter if it
+ * isn't clocking because the mux will get stuck and the clock will stop
+ * outputting a clock. This can happen if the framework isn't aware that this
+ * clock is on and so clk_set_rate() doesn't turn on the new parent. To fix
+ * this we switch the mux in the enable/disable ops and reprogram the M/N
+ * counter in the set_rate op. We also make sure to switch away from the M/N
+ * counter in set_rate if software thinks the clock is off.
+ */
+static int clk_rcg_lcc_set_rate(struct clk_hw *hw, unsigned long rate,
+                                unsigned long parent_rate)
+{
+        struct clk_rcg *rcg = to_clk_rcg(hw);
+        const struct freq_tbl *f;
+        int ret;
+        u32 gfm = BIT(10);
+
+        f = qcom_find_freq(rcg->freq_tbl, rate);
+        if (!f)
+                return -EINVAL;
+
+        /* Switch to XO to avoid glitches */
+        regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, 0);
+        ret = __clk_rcg_set_rate(rcg, f);
+        /* Switch back to M/N if it's clocking */
+        if (__clk_is_enabled(hw->clk))
+                regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, gfm);
+
+        return ret;
+}
+
+static int clk_rcg_lcc_enable(struct clk_hw *hw)
+{
+        struct clk_rcg *rcg = to_clk_rcg(hw);
+        u32 gfm = BIT(10);
+
+        /* Use M/N */
+        return regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, gfm);
+}
+
+static void clk_rcg_lcc_disable(struct clk_hw *hw)
+{
+        struct clk_rcg *rcg = to_clk_rcg(hw);
+        u32 gfm = BIT(10);
+
+        /* Use XO */
+        regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, 0);
+}
+
 static int __clk_dyn_rcg_set_rate(struct clk_hw *hw, unsigned long rate)
 {
         struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
@@ -543,6 +594,17 @@ const struct clk_ops clk_rcg_bypass_ops = {
 };
 EXPORT_SYMBOL_GPL(clk_rcg_bypass_ops);
 
+const struct clk_ops clk_rcg_lcc_ops = {
+        .enable = clk_rcg_lcc_enable,
+        .disable = clk_rcg_lcc_disable,
+        .get_parent = clk_rcg_get_parent,
+        .set_parent = clk_rcg_set_parent,
+        .recalc_rate = clk_rcg_recalc_rate,
+        .determine_rate = clk_rcg_determine_rate,
+        .set_rate = clk_rcg_lcc_set_rate,
+};
+EXPORT_SYMBOL_GPL(clk_rcg_lcc_ops);
+
 const struct clk_ops clk_dyn_rcg_ops = {
         .enable = clk_enable_regmap,
         .is_enabled = clk_is_enabled_regmap,
diff --git a/drivers/clk/qcom/clk-rcg.h b/drivers/clk/qcom/clk-rcg.h
index 687e41f91d7c..d09d06ba278e 100644
--- a/drivers/clk/qcom/clk-rcg.h
+++ b/drivers/clk/qcom/clk-rcg.h
@@ -96,6 +96,7 @@ struct clk_rcg {
 
 extern const struct clk_ops clk_rcg_ops;
 extern const struct clk_ops clk_rcg_bypass_ops;
+extern const struct clk_ops clk_rcg_lcc_ops;
 
 #define to_clk_rcg(_hw) container_of(to_clk_regmap(_hw), struct clk_rcg, clkr)
 
diff --git a/drivers/clk/qcom/lcc-ipq806x.c b/drivers/clk/qcom/lcc-ipq806x.c
index 121ffde25dc3..5e4a3dafcf63 100644
--- a/drivers/clk/qcom/lcc-ipq806x.c
+++ b/drivers/clk/qcom/lcc-ipq806x.c
@@ -386,13 +386,12 @@ static struct clk_rcg ahbix_clk = {
         .freq_tbl = clk_tbl_ahbix,
         .clkr = {
                 .enable_reg = 0x38,
-                .enable_mask = BIT(10), /* toggle the gfmux to select mn/pxo */
+                .enable_mask = BIT(11),
                 .hw.init = &(struct clk_init_data){
                         .name = "ahbix",
                         .parent_names = lcc_pxo_pll4,
                         .num_parents = 2,
-                        .ops = &clk_rcg_ops,
-                        .flags = CLK_SET_RATE_GATE,
+                        .ops = &clk_rcg_lcc_ops,
                 },
         },
 };