[PATCH 2/2] drm/msm/dpu: add HDMI output support

[Abhinav Kumar]

On 4/15/2023 10:19 AM, Dmitry Baryshkov wrote:
> MSM8998 and the older Qualcomm platforms support HDMI outputs. Now as
> DPU encoder is ready, add support for using INTF_HDMI.
> 

 From what I see, encoder was always ready but just HDMI case was not 
handled? Or are you saying this because of the prev patch which sorts 
out encoder_type and intf_type

> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 45 +++++++++++++++++++++++++
>   1 file changed, 45 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index e85e3721d2c7..65cce59163a4 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> @@ -617,6 +617,45 @@ static int _dpu_kms_initialize_displayport(struct drm_device *dev,
>   	return 0;
>   }
>   
> +static int _dpu_kms_initialize_hdmi(struct drm_device *dev,
> +				    struct msm_drm_private *priv,
> +				    struct dpu_kms *dpu_kms)
> +{
> +	struct drm_encoder *encoder = NULL;
> +	struct msm_display_info info;
> +	int rc;
> +	int i;
> +
> +	if (!priv->hdmi)
> +		return 0;
> +
> +	encoder = dpu_encoder_init(dev, DRM_MODE_ENCODER_TMDS);
> +	if (IS_ERR(encoder)) {
> +		DPU_ERROR("encoder init failed for HDMI display\n");
> +		return PTR_ERR(encoder);
> +	}
> +
> +	memset(&info, 0, sizeof(info));
> +	rc = msm_hdmi_modeset_init(priv->hdmi, dev, encoder);
> +	if (rc) {
> +		DPU_ERROR("modeset_init failed for DP, rc = %d\n", rc);
> +		drm_encoder_cleanup(encoder);
> +		return rc;
> +	}
> +
> +	info.num_of_h_tiles = 1;
> +	info.h_tile_instance[0] = i;

As Arnaud noted, i is uninitialized here.

> +	info.intf_type = INTF_HDMI;
> +	rc = dpu_encoder_setup(dev, encoder, &info);
> +	if (rc) {
> +		DPU_ERROR("failed to setup DPU encoder %d: rc:%d\n",
> +			  encoder->base.id, rc);
> +		return rc;
> +	}
> +
> +	return 0;
> +}
> +
>   static int _dpu_kms_initialize_writeback(struct drm_device *dev,
>   		struct msm_drm_private *priv, struct dpu_kms *dpu_kms,
>   		const u32 *wb_formats, int n_formats)
> @@ -683,6 +722,12 @@ static int _dpu_kms_setup_displays(struct drm_device *dev,
>   		return rc;
>   	}
>   
> +	rc = _dpu_kms_initialize_hdmi(dev, priv, dpu_kms);
> +	if (rc) {
> +		DPU_ERROR("initialize HDMI failed, rc = %d\n", rc);
> +		return rc;
> +	}
> +
>   	/* Since WB isn't a driver check the catalog before initializing */
>   	if (dpu_kms->catalog->wb_count) {
>   		for (i = 0; i < dpu_kms->catalog->wb_count; i++) {