drm/bridge: lt9611: rework infoframes handling

Rework handling infoframes:
- Write full HDMI AVI infoframe instead of just fixing the VIC value
- Also send the HDMI Vendor Specific infoframe, as recommended by the
  HDMI spec.
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230118081658.2198520-12-dmitry.baryshkov@linaro.org

drivers/gpu/drm/bridge/lontium-lt9611.c

@@ -59,7 +59,6 @@ struct lt9611 {
 	enum drm_connector_status status;
 
 	u8 edid_buf[EDID_SEG_SIZE];
-	u32 vic;
 };
 
 #define LT9611_PAGE_CONTROL	0xff
@@ -353,12 +352,51 @@ static int lt9611_video_check(struct lt9611 *lt9611)
 	return temp;
 }
 
-static void lt9611_hdmi_tx_digital(struct lt9611 *lt9611, bool is_hdmi)
+static void lt9611_hdmi_set_infoframes(struct lt9611 *lt9611,
+				       struct drm_connector *connector,
+				       struct drm_display_mode *mode)
 {
-	regmap_write(lt9611->regmap, 0x8443, 0x46 - lt9611->vic);
-	regmap_write(lt9611->regmap, 0x8447, lt9611->vic);
-	regmap_write(lt9611->regmap, 0x843d, 0x0a); /* UD1 infoframe */
+	union hdmi_infoframe infoframe;
+	ssize_t len;
+	u8 iframes = 0x0a; /* UD1 infoframe */
+	u8 buf[32];
+	int ret;
+	int i;
+
+	ret = drm_hdmi_avi_infoframe_from_display_mode(&infoframe.avi,
+						       connector,
+						       mode);
+	if (ret < 0)
+		goto out;
+
+	len = hdmi_infoframe_pack(&infoframe, buf, sizeof(buf));
+	if (len < 0)
+		goto out;
+
+	for (i = 0; i < len; i++)
+		regmap_write(lt9611->regmap, 0x8440 + i, buf[i]);
+
+	ret = drm_hdmi_vendor_infoframe_from_display_mode(&infoframe.vendor.hdmi,
+							  connector,
+							  mode);
+	if (ret < 0)
+		goto out;
+
+	len = hdmi_infoframe_pack(&infoframe, buf, sizeof(buf));
+	if (len < 0)
+		goto out;
 
+	for (i = 0; i < len; i++)
+		regmap_write(lt9611->regmap, 0x8474 + i, buf[i]);
+
+	iframes |= 0x20;
+
+out:
+	regmap_write(lt9611->regmap, 0x843d, iframes); /* UD1 infoframe */
+}
+
+static void lt9611_hdmi_tx_digital(struct lt9611 *lt9611, bool is_hdmi)
+{
 	if (is_hdmi)
 		regmap_write(lt9611->regmap, 0x82d6, 0x8c);
 	else
@@ -688,9 +726,7 @@ lt9611_bridge_atomic_enable(struct drm_bridge *bridge,
 	struct drm_connector_state *conn_state;
 	struct drm_crtc_state *crtc_state;
 	struct drm_display_mode *mode;
-	struct hdmi_avi_infoframe avi_frame;
 	unsigned int postdiv;
-	int ret;
 
 	connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
 	if (WARN_ON(!connector))
@@ -711,18 +747,13 @@ lt9611_bridge_atomic_enable(struct drm_bridge *bridge,
 	lt9611_mipi_video_setup(lt9611, mode);
 	lt9611_pcr_setup(lt9611, mode, postdiv);
 
-	ret = drm_hdmi_avi_infoframe_from_display_mode(&avi_frame,
-						       connector,
-						       mode);
-	if (!ret)
-		lt9611->vic = avi_frame.video_code;
-
 	if (lt9611_power_on(lt9611)) {
 		dev_err(lt9611->dev, "power on failed\n");
 		return;
 	}
 
 	lt9611_mipi_input_analog(lt9611);
+	lt9611_hdmi_set_infoframes(lt9611, connector, mode);
 	lt9611_hdmi_tx_digital(lt9611, connector->display_info.is_hdmi);
 	lt9611_hdmi_tx_phy(lt9611);