clk: qcom: clk-alpha-pll: Skip reconfiguring the running Lucid Evo

The PLL0 is configured by the bootloader and is the parent of the
mdp_clk_src. The Trion implementation of the configure function is
already skipping this step if the PLL is enabled, so lets extend the
same behavior to Lucid Evo variant.

Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20240418-clk-qcom-lucid-evo-skip-configuring-enabled-v1-1-caede5f1c7a3@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index 8a412ef47e1631705326c7380042c8c3c4c93526..4c5aeccff0ef53bca06313f67fc24ea4a67262fa 100644 (file)
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -2114,6 +2114,15 @@ void clk_lucid_evo_pll_configure(struct clk_alpha_pll *pll, struct regmap *regma
 {
        u32 lval = config->l;
 
+       /*
+        * If the bootloader left the PLL enabled it's likely that there are
+        * RCGs that will lock up if we disable the PLL below.
+        */
+       if (trion_pll_is_enabled(pll, regmap)) {
+               pr_debug("Lucid Evo PLL is already enabled, skipping configuration\n");
+               return;
+       }
+
        lval |= TRION_PLL_CAL_VAL << LUCID_EVO_PLL_CAL_L_VAL_SHIFT;
        clk_alpha_pll_write_config(regmap, PLL_L_VAL(pll), lval);
        clk_alpha_pll_write_config(regmap, PLL_ALPHA_VAL(pll), config->alpha);