drm/i915/display: Split hsw_power_well_enable() into two

This is a preparation for ICL TC cold exit sequences.

v2:
- renamed new functions to hsw_power_well_enable_prepare()/complete()

Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Tested-by: You-Sheng Yang <vicamo.yang@canonical.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200414194956.164323-3-jose.souza@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index 0cf5ed0..606a165 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -380,16 +380,16 @@ static void gen9_wait_for_power_well_fuses(struct drm_i915_private *dev_priv,
                                          SKL_FUSE_PG_DIST_STATUS(pg), 1));
 }
 
-static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
-                                 struct i915_power_well *power_well)
+static void hsw_power_well_enable_prepare(struct drm_i915_private *dev_priv,
+                                         struct i915_power_well *power_well)
 {
        const struct i915_power_well_regs *regs = power_well->desc->hsw.regs;
        int pw_idx = power_well->desc->hsw.idx;
-       bool wait_fuses = power_well->desc->hsw.has_fuses;
-       enum skl_power_gate uninitialized_var(pg);
        u32 val;
 
-       if (wait_fuses) {
+       if (power_well->desc->hsw.has_fuses) {
+               enum skl_power_gate pg;
+
                pg = INTEL_GEN(dev_priv) >= 11 ? ICL_PW_CTL_IDX_TO_PG(pw_idx) :
                                                 SKL_PW_CTL_IDX_TO_PG(pw_idx);
                /*
@@ -406,25 +406,46 @@ static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
        val = intel_de_read(dev_priv, regs->driver);
        intel_de_write(dev_priv, regs->driver,
                       val | HSW_PWR_WELL_CTL_REQ(pw_idx));
+}
+
+static void hsw_power_well_enable_complete(struct drm_i915_private *dev_priv,
+                                          struct i915_power_well *power_well)
+{
+       int pw_idx = power_well->desc->hsw.idx;
+
        hsw_wait_for_power_well_enable(dev_priv, power_well);
 
        /* Display WA #1178: cnl */
        if (IS_CANNONLAKE(dev_priv) &&
            pw_idx >= GLK_PW_CTL_IDX_AUX_B &&
            pw_idx <= CNL_PW_CTL_IDX_AUX_F) {
+               u32 val;
+
                val = intel_de_read(dev_priv, CNL_AUX_ANAOVRD1(pw_idx));
                val |= CNL_AUX_ANAOVRD1_ENABLE | CNL_AUX_ANAOVRD1_LDO_BYPASS;
                intel_de_write(dev_priv, CNL_AUX_ANAOVRD1(pw_idx), val);
        }
 
-       if (wait_fuses)
+       if (power_well->desc->hsw.has_fuses) {
+               enum skl_power_gate pg;
+
+               pg = INTEL_GEN(dev_priv) >= 11 ? ICL_PW_CTL_IDX_TO_PG(pw_idx) :
+                                                SKL_PW_CTL_IDX_TO_PG(pw_idx);
                gen9_wait_for_power_well_fuses(dev_priv, pg);
+       }
 
        hsw_power_well_post_enable(dev_priv,
                                   power_well->desc->hsw.irq_pipe_mask,
                                   power_well->desc->hsw.has_vga);
 }
 
+static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
+                                 struct i915_power_well *power_well)
+{
+       hsw_power_well_enable_prepare(dev_priv, power_well);
+       hsw_power_well_enable_complete(dev_priv, power_well);
+}
+
 static void hsw_power_well_disable(struct drm_i915_private *dev_priv,
                                   struct i915_power_well *power_well)
 {
@@ -570,7 +591,11 @@ icl_tc_phy_aux_power_well_enable(struct drm_i915_private *dev_priv,
                val |= DP_AUX_CH_CTL_TBT_IO;
        intel_de_write(dev_priv, DP_AUX_CH_CTL(aux_ch), val);
 
-       hsw_power_well_enable(dev_priv, power_well);
+       hsw_power_well_enable_prepare(dev_priv, power_well);
+
+       /* TODO ICL TC cold handling */
+
+       hsw_power_well_enable_complete(dev_priv, power_well);
 
        if (INTEL_GEN(dev_priv) >= 12 && !power_well->desc->hsw.is_tc_tbt) {
                enum tc_port tc_port;