soc: apple: apple-pmgr-pwrstate: Add auto-PM min level support

This is seemingly required for DCP/DCPEXT, without which they refuse to
boot properly. They need to be set to minimum state 4 (clock gated).

Reviewed-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Hector Martin <marcan@marcan.st>

diff --git a/drivers/soc/apple/apple-pmgr-pwrstate.c b/drivers/soc/apple/apple-pmgr-pwrstate.c
index 8ad9d5fdefbfb7350550b0e3007e67898168de88..e1122288409ab3f7d1d747b7742e0b5d9df33859 100644 (file)
--- a/drivers/soc/apple/apple-pmgr-pwrstate.c
+++ b/drivers/soc/apple/apple-pmgr-pwrstate.c
@@ -20,6 +20,7 @@
 #define APPLE_PMGR_RESET        BIT(31)
 #define APPLE_PMGR_AUTO_ENABLE  BIT(28)
 #define APPLE_PMGR_PS_AUTO      GENMASK(27, 24)
+#define APPLE_PMGR_PS_MIN       GENMASK(19, 16)
 #define APPLE_PMGR_PARENT_OFF   BIT(11)
 #define APPLE_PMGR_DEV_DISABLE  BIT(10)
 #define APPLE_PMGR_WAS_CLKGATED BIT(9)
@@ -42,6 +43,7 @@ struct apple_pmgr_ps {
        struct reset_controller_dev rcdev;
        struct regmap *regmap;
        u32 offset;
+       u32 min_state;
 };
 
 #define genpd_to_apple_pmgr_ps(_genpd) container_of(_genpd, struct apple_pmgr_ps, genpd)
@@ -224,6 +226,11 @@ static int apple_pmgr_ps_probe(struct platform_device *pdev)
        ps->genpd.power_on = apple_pmgr_ps_power_on;
        ps->genpd.power_off = apple_pmgr_ps_power_off;
 
+       ret = of_property_read_u32(node, "apple,min-state", &ps->min_state);
+       if (ret == 0 && ps->min_state <= APPLE_PMGR_PS_ACTIVE)
+               regmap_update_bits(regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_PS_MIN,
+                                  FIELD_PREP(APPLE_PMGR_PS_MIN, ps->min_state));
+
        active = apple_pmgr_ps_is_active(ps);
        if (of_property_read_bool(node, "apple,always-on")) {
                ps->genpd.flags |= GENPD_FLAG_ALWAYS_ON;