[Intel-gfx] [PATCH v2 09/14] drm/i915: Sprinkle WARN(!pll) into icl/dg1 .clock_enable()

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

The other DDI .enable_clock() functions are trying to protect us
against pll==NULL. A bit tempted to throw out all the WARNs as
just unnecessary noise, but I guess they might have some use
when poking around the shared_dpll code (not sure it wouldn't
oops elsewhere though). So let's unify it all and sprinkle in
the missing WARNs for icl/dg1.

Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 0b2a1e0c1b8b..0a2eb426616b 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3134,6 +3134,9 @@ static void dg1_ddi_enable_clock(struct intel_encoder *encoder,
 	struct intel_shared_dpll *pll = crtc_state->shared_dpll;
 	enum phy phy = intel_port_to_phy(dev_priv, encoder->port);
 
+	if (drm_WARN_ON(&dev_priv->drm, !pll))
+		return;
+
 	/*
 	 * If we fail this, something went very wrong: first 2 PLLs should be
 	 * used by first 2 phys and last 2 PLLs by last phys
@@ -3191,6 +3194,9 @@ static void icl_ddi_combo_enable_clock(struct intel_encoder *encoder,
 		sel = ICL_DPCLKA_CFGCR0_DDI_CLK_SEL(pll->info->id, phy);
 	}
 
+	if (drm_WARN_ON(&dev_priv->drm, !pll))
+		return;
+
 	mutex_lock(&dev_priv->dpll.lock);
 
 	/*
-- 
2.26.2

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