drm/i915: Don't cast away const from infoframe buffer

We don't modify the packed infoframe data, so we should keep the
const qualifier in place. Just pass the buffer as 'const void *'
instead of 'const uint8_t *' and we can drop the cast entirely.

v2: Do intel_sdvo_write_infoframe() as well
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_drv.h

@@ -455,7 +455,7 @@ struct intel_hdmi {
 	bool rgb_quant_range_selectable;
 	void (*write_infoframe)(struct drm_encoder *encoder,
 				enum hdmi_infoframe_type type,
-				const uint8_t *frame, ssize_t len);
+				const void *frame, ssize_t len);
 	void (*set_infoframes)(struct drm_encoder *encoder,
 			       struct drm_display_mode *adjusted_mode);
 };

drivers/gpu/drm/i915/intel_hdmi.c

@@ -130,9 +130,9 @@ static u32 hsw_infoframe_data_reg(enum hdmi_infoframe_type type,
 
 static void g4x_write_infoframe(struct drm_encoder *encoder,
 				enum hdmi_infoframe_type type,
-				const uint8_t *frame, ssize_t len)
+				const void *frame, ssize_t len)
 {
-	uint32_t *data = (uint32_t *)frame;
+	const uint32_t *data = frame;
 	struct drm_device *dev = encoder->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 val = I915_READ(VIDEO_DIP_CTL);
@@ -167,9 +167,9 @@ static void g4x_write_infoframe(struct drm_encoder *encoder,
 
 static void ibx_write_infoframe(struct drm_encoder *encoder,
 				enum hdmi_infoframe_type type,
-				const uint8_t *frame, ssize_t len)
+				const void *frame, ssize_t len)
 {
-	uint32_t *data = (uint32_t *)frame;
+	const uint32_t *data = frame;
 	struct drm_device *dev = encoder->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
@@ -205,9 +205,9 @@ static void ibx_write_infoframe(struct drm_encoder *encoder,
 
 static void cpt_write_infoframe(struct drm_encoder *encoder,
 				enum hdmi_infoframe_type type,
-				const uint8_t *frame, ssize_t len)
+				const void *frame, ssize_t len)
 {
-	uint32_t *data = (uint32_t *)frame;
+	const uint32_t *data = frame;
 	struct drm_device *dev = encoder->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
@@ -246,9 +246,9 @@ static void cpt_write_infoframe(struct drm_encoder *encoder,
 
 static void vlv_write_infoframe(struct drm_encoder *encoder,
 				enum hdmi_infoframe_type type,
-				const uint8_t *frame, ssize_t len)
+				const void *frame, ssize_t len)
 {
-	uint32_t *data = (uint32_t *)frame;
+	const uint32_t *data = frame;
 	struct drm_device *dev = encoder->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
@@ -284,9 +284,9 @@ static void vlv_write_infoframe(struct drm_encoder *encoder,
 
 static void hsw_write_infoframe(struct drm_encoder *encoder,
 				enum hdmi_infoframe_type type,
-				const uint8_t *frame, ssize_t len)
+				const void *frame, ssize_t len)
 {
-	uint32_t *data = (uint32_t *)frame;
+	const uint32_t *data = frame;
 	struct drm_device *dev = encoder->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);

drivers/gpu/drm/i915/intel_sdvo.c

@@ -952,7 +952,7 @@ static void intel_sdvo_dump_hdmi_buf(struct intel_sdvo *intel_sdvo)
 
 static bool intel_sdvo_write_infoframe(struct intel_sdvo *intel_sdvo,
 				       unsigned if_index, uint8_t tx_rate,
-				       uint8_t *data, unsigned length)
+				       const uint8_t *data, unsigned length)
 {
 	uint8_t set_buf_index[2] = { if_index, 0 };
 	uint8_t hbuf_size, tmp[8];