[Intel-gfx] [PATCH 12/21] drm/i915: constify fdi link training vtable

[Dave Airlie <airlied@gmail.com>]

From: Dave Airlie <airlied@redhat.com>

Avoid having writeable function pointers.
---
 drivers/gpu/drm/i915/display/intel_display.c |  2 +-
 drivers/gpu/drm/i915/display/intel_fdi.c     | 18 +++++++++++++++---
 drivers/gpu/drm/i915/i915_drv.h              |  2 +-
 3 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 87950202f4ce..0ad577aceb9d 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -2100,7 +2100,7 @@ static void ilk_pch_enable(const struct intel_atomic_state *state,
 	assert_pch_transcoder_disabled(dev_priv, pipe);
 
 	/* For PCH output, training FDI link */
-	dev_priv->fdi_funcs.fdi_link_train(crtc, crtc_state);
+	dev_priv->fdi_funcs->fdi_link_train(crtc, crtc_state);
 
 	/* We need to program the right clock selection before writing the pixel
 	 * mutliplier into the DPLL. */
diff --git a/drivers/gpu/drm/i915/display/intel_fdi.c b/drivers/gpu/drm/i915/display/intel_fdi.c
index d9f952e0c67f..68aa9c7b18ec 100644
--- a/drivers/gpu/drm/i915/display/intel_fdi.c
+++ b/drivers/gpu/drm/i915/display/intel_fdi.c
@@ -1005,15 +1005,27 @@ void lpt_fdi_program_mphy(struct drm_i915_private *dev_priv)
 	intel_sbi_write(dev_priv, 0x21EC, tmp, SBI_MPHY);
 }
 
+static const struct drm_i915_fdi_link_train_funcs ilk_funcs = {
+	.fdi_link_train = ilk_fdi_link_train
+};
+
+static const struct drm_i915_fdi_link_train_funcs gen6_funcs = {
+	.fdi_link_train = gen6_fdi_link_train
+};
+
+static const struct drm_i915_fdi_link_train_funcs ivb_funcs = {
+	.fdi_link_train = ivb_manual_fdi_link_train
+};
+
 void
 intel_fdi_init_hook(struct drm_i915_private *dev_priv)
 {
 	if (IS_IRONLAKE(dev_priv)) {
-		dev_priv->fdi_funcs.fdi_link_train = ilk_fdi_link_train;
+		dev_priv->fdi_funcs = &ilk_funcs;
 	} else if (IS_SANDYBRIDGE(dev_priv)) {
-		dev_priv->fdi_funcs.fdi_link_train = gen6_fdi_link_train;
+		dev_priv->fdi_funcs = &gen6_funcs;
 	} else if (IS_IVYBRIDGE(dev_priv)) {
 		/* FIXME: detect B0+ stepping and use auto training */
-		dev_priv->fdi_funcs.fdi_link_train = ivb_manual_fdi_link_train;
+		dev_priv->fdi_funcs = &ivb_funcs;
 	}
 }
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 461ab0a0f088..b3765222e717 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1006,7 +1006,7 @@ struct drm_i915_private {
 	struct drm_i915_irq_funcs irq_funcs;
 
 	/* fdi display functions */
-	struct drm_i915_fdi_link_train_funcs fdi_funcs;
+	const struct drm_i915_fdi_link_train_funcs *fdi_funcs;
 
 	/* display pll funcs */
 	struct drm_i915_dpll_funcs dpll_funcs;
-- 
2.31.1