[PATCH 13/21] drm/i915: constify irq function vtable.

[Dave Airlie <airlied@xxxxxxxxx>]

From: Dave Airlie <airlied@xxxxxxxxxx>

Use a macro to avoid mistakes, this type of macro is only used
in a couple of places.
---
 drivers/gpu/drm/i915/display/intel_hotplug.c |  4 +--
 drivers/gpu/drm/i915/i915_drv.h              |  2 +-
 drivers/gpu/drm/i915/i915_irq.c              | 27 +++++++++++++++-----
 3 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.c b/drivers/gpu/drm/i915/display/intel_hotplug.c
index a06e1e1b33e1..97df40107213 100644
--- a/drivers/gpu/drm/i915/display/intel_hotplug.c
+++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
@@ -215,8 +215,8 @@ intel_hpd_irq_storm_switch_to_polling(struct drm_i915_private *dev_priv)
 
 static void intel_hpd_irq_setup(struct drm_i915_private *i915)
 {
-	if (i915->display_irqs_enabled && i915->irq_funcs.hpd_irq_setup)
-		i915->irq_funcs.hpd_irq_setup(i915);
+	if (i915->display_irqs_enabled && i915->irq_funcs)
+		i915->irq_funcs->hpd_irq_setup(i915);
 }
 
 static void intel_hpd_irq_storm_reenable_work(struct work_struct *work)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b3765222e717..6050bb519b18 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1003,7 +1003,7 @@ struct drm_i915_private {
 	struct drm_i915_wm_disp_funcs wm_disp;
 
 	/* irq display functions */
-	struct drm_i915_irq_funcs irq_funcs;
+	const struct drm_i915_irq_funcs *irq_funcs;
 
 	/* fdi display functions */
 	const struct drm_i915_fdi_link_train_funcs *fdi_funcs;
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index f515a3a76a8e..29231daf6057 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -4345,6 +4345,19 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
 	return ret;
 }
 
+#define HPD_FUNCS(platform)					\
+static const struct drm_i915_irq_funcs platform##_hpd_funcs = { \
+	.hpd_irq_setup = platform##_hpd_irq_setup		\
+}
+
+HPD_FUNCS(i915);
+HPD_FUNCS(dg1);
+HPD_FUNCS(gen11);
+HPD_FUNCS(bxt);
+HPD_FUNCS(icp);
+HPD_FUNCS(spt);
+HPD_FUNCS(ilk);
+
 /**
  * intel_irq_init - initializes irq support
  * @dev_priv: i915 device instance
@@ -4395,20 +4408,20 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 
 	if (HAS_GMCH(dev_priv)) {
 		if (I915_HAS_HOTPLUG(dev_priv))
-			dev_priv->irq_funcs.hpd_irq_setup = i915_hpd_irq_setup;
+			dev_priv->irq_funcs = &i915_hpd_funcs;
 	} else {
 		if (HAS_PCH_DG1(dev_priv))
-			dev_priv->irq_funcs.hpd_irq_setup = dg1_hpd_irq_setup;
+			dev_priv->irq_funcs = &dg1_hpd_funcs;
 		else if (DISPLAY_VER(dev_priv) >= 11)
-			dev_priv->irq_funcs.hpd_irq_setup = gen11_hpd_irq_setup;
+			dev_priv->irq_funcs = &gen11_hpd_funcs;
 		else if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv))
-			dev_priv->irq_funcs.hpd_irq_setup = bxt_hpd_irq_setup;
+			dev_priv->irq_funcs = &bxt_hpd_funcs;
 		else if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
-			dev_priv->irq_funcs.hpd_irq_setup = icp_hpd_irq_setup;
+			dev_priv->irq_funcs = &icp_hpd_funcs;
 		else if (INTEL_PCH_TYPE(dev_priv) >= PCH_SPT)
-			dev_priv->irq_funcs.hpd_irq_setup = spt_hpd_irq_setup;
+			dev_priv->irq_funcs = &spt_hpd_funcs;
 		else
-			dev_priv->irq_funcs.hpd_irq_setup = ilk_hpd_irq_setup;
+			dev_priv->irq_funcs = &ilk_hpd_funcs;
 	}
 }
 
-- 
2.31.1