Re: [PATCH v2 11/13] drm/bridge: lt9611: rework infoframes handling

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On 08/01/2023 17:56, Dmitry Baryshkov wrote:
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.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
  drivers/gpu/drm/bridge/lontium-lt9611.c | 57 +++++++++++++++++++------
  1 file changed, 44 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
index 1396ab081f61..82af1f954cc6 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611.c
+++ b/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
@@ -352,12 +351,51 @@ 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
@@ -687,9 +725,7 @@ 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))
@@ -710,18 +746,13 @@ 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);

Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>



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