drm/i915: Constify states passed to enable/disable/etc. encoder hooks

The enable/disable/etc. encoder hooks aren't supposed to alter the
state(s), so pass them as const. Unfortunately C lacks any kind of deep
const thingy, so this can't catch all abuses. But at least it acts as a
hint to the reader telling them not to mess about with the state(s).

v2: Update intel_tv_mode_find() and ironlake_edp_pll_on() as well
v3: Deal with intel_sdvo_connector_state

Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170818134958.15502-9-ville.syrjala@linux.intel.com

1 files changed, 19 insertions, 21 deletions

diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 3dc38c2..9509a18 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -201,11 +201,8 @@ to_intel_sdvo_connector(struct drm_connector *connector)
 	return container_of(connector, struct intel_sdvo_connector, base.base);
 }
 
-static struct intel_sdvo_connector_state *
-to_intel_sdvo_connector_state(struct drm_connector_state *conn_state)
-{
-	return container_of(conn_state, struct intel_sdvo_connector_state, base.base);
-}
+#define to_intel_sdvo_connector_state(conn_state) \
+	container_of((conn_state), struct intel_sdvo_connector_state, base.base)
 
 static bool
 intel_sdvo_output_setup(struct intel_sdvo *intel_sdvo, uint16_t flags);
@@ -998,7 +995,7 @@ static bool intel_sdvo_write_infoframe(struct intel_sdvo *intel_sdvo,
 }
 
 static bool intel_sdvo_set_avi_infoframe(struct intel_sdvo *intel_sdvo,
-					 struct intel_crtc_state *pipe_config)
+					 const struct intel_crtc_state *pipe_config)
 {
 	uint8_t sdvo_data[HDMI_INFOFRAME_SIZE(AVI)];
 	union hdmi_infoframe frame;
@@ -1032,7 +1029,7 @@ static bool intel_sdvo_set_avi_infoframe(struct intel_sdvo *intel_sdvo,
 }
 
 static bool intel_sdvo_set_tv_format(struct intel_sdvo *intel_sdvo,
-				     struct drm_connector_state *conn_state)
+				     const struct drm_connector_state *conn_state)
 {
 	struct intel_sdvo_tv_format format;
 	uint32_t format_map;
@@ -1202,9 +1199,9 @@ static bool intel_sdvo_compute_config(struct intel_encoder *encoder,
 	} while (0)
 
 static void intel_sdvo_update_props(struct intel_sdvo *intel_sdvo,
-				    struct intel_sdvo_connector_state *sdvo_state)
+				    const struct intel_sdvo_connector_state *sdvo_state)
 {
-	struct drm_connector_state *conn_state = &sdvo_state->base.base;
+	const struct drm_connector_state *conn_state = &sdvo_state->base.base;
 	struct intel_sdvo_connector *intel_sdvo_conn =
 		to_intel_sdvo_connector(conn_state->connector);
 	uint16_t val;
@@ -1258,14 +1255,15 @@ static void intel_sdvo_update_props(struct intel_sdvo *intel_sdvo,
 }
 
 static void intel_sdvo_pre_enable(struct intel_encoder *intel_encoder,
-				  struct intel_crtc_state *crtc_state,
-				  struct drm_connector_state *conn_state)
+				  const struct intel_crtc_state *crtc_state,
+				  const struct drm_connector_state *conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(intel_encoder->base.dev);
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
 	const struct drm_display_mode *adjusted_mode = &crtc_state->base.adjusted_mode;
-	struct intel_sdvo_connector_state *sdvo_state = to_intel_sdvo_connector_state(conn_state);
-	struct drm_display_mode *mode = &crtc_state->base.mode;
+	const struct intel_sdvo_connector_state *sdvo_state =
+		to_intel_sdvo_connector_state(conn_state);
+	const struct drm_display_mode *mode = &crtc_state->base.mode;
 	struct intel_sdvo *intel_sdvo = to_sdvo(intel_encoder);
 	u32 sdvox;
 	struct intel_sdvo_in_out_map in_out;
@@ -1507,8 +1505,8 @@ static void intel_sdvo_get_config(struct intel_encoder *encoder,
 }
 
 static void intel_disable_sdvo(struct intel_encoder *encoder,
-			       struct intel_crtc_state *old_crtc_state,
-			       struct drm_connector_state *conn_state)
+			       const struct intel_crtc_state *old_crtc_state,
+			       const struct drm_connector_state *conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_sdvo *intel_sdvo = to_sdvo(encoder);
@@ -1552,21 +1550,21 @@ static void intel_disable_sdvo(struct intel_encoder *encoder,
 }
 
 static void pch_disable_sdvo(struct intel_encoder *encoder,
-			     struct intel_crtc_state *old_crtc_state,
-			     struct drm_connector_state *old_conn_state)
+			     const struct intel_crtc_state *old_crtc_state,
+			     const struct drm_connector_state *old_conn_state)
 {
 }
 
 static void pch_post_disable_sdvo(struct intel_encoder *encoder,
-				  struct intel_crtc_state *old_crtc_state,
-				  struct drm_connector_state *old_conn_state)
+				  const struct intel_crtc_state *old_crtc_state,
+				  const struct drm_connector_state *old_conn_state)
 {
 	intel_disable_sdvo(encoder, old_crtc_state, old_conn_state);
 }
 
 static void intel_enable_sdvo(struct intel_encoder *encoder,
-			      struct intel_crtc_state *pipe_config,
-			      struct drm_connector_state *conn_state)
+			      const struct intel_crtc_state *pipe_config,
+			      const struct drm_connector_state *conn_state)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);