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

[Neil Armstrong]

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 at linaro.org>
> ---
>   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 at linaro.org>