From: Esteban Urrutia <[email protected]>
On some platforms such as SM8475, not doing this may result in graphical
glitches when the mdss driver takes over.
This fixes the aforementioned issue.
Fixes: 3132a9a11e57 ("clk: qcom: clk-alpha-pll: Add support for lucid ole pll
configure")
Signed-off-by: Esteban Urrutia <[email protected]>
---
drivers/clk/qcom/clk-alpha-pll.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index f8313f9d0e30..60173b076cc5 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -2373,6 +2373,15 @@ void clk_lucid_ole_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 Ole PLL is already enabled, skipping
configuration\n");
+ return;
+ }
+
lval |= TRION_PLL_CAL_VAL << LUCID_EVO_PLL_CAL_L_VAL_SHIFT;
lval |= TRION_PLL_CAL_VAL << LUCID_OLE_PLL_RINGOSC_CAL_L_VAL_SHIFT;
clk_alpha_pll_write_config(regmap, PLL_L_VAL(pll), lval);
--
2.55.0
