Re: [PATCH v5 20/22] drm/vc4: vec: Convert to the new TV mode property

[Mateusz Kwiatkowski <kfyatek@gmail.com>]

Hi Maxime,

>  static int vc4_vec_connector_get_modes(struct drm_connector *connector)
>  {
> -	struct drm_connector_state *state = connector->state;
>  	struct drm_display_mode *mode;
>  
> -	mode = drm_mode_duplicate(connector->dev,
> -				  vc4_vec_tv_modes[state->tv.legacy_mode].mode);
> +	mode = drm_mode_analog_ntsc_480i(connector->dev);
>  	if (!mode) {
>  		DRM_ERROR("Failed to create a new display mode\n");
>  		return -ENOMEM;
>  	}
>  
> +	mode->type |= DRM_MODE_TYPE_PREFERRED;
>  	drm_mode_probed_add(connector, mode);
>  
> -	return 1;
> +	mode = drm_mode_analog_pal_576i(connector->dev);
> +	if (!mode) {
> +		DRM_ERROR("Failed to create a new display mode\n");
> +		return -ENOMEM;
> +	}
> +
> +	drm_mode_probed_add(connector, mode);
> +
> +	return 2;
> +}

Referencing those previous discussions:
- https://lore.kernel.org/dri-devel/0255f7c6-0484-6456-350d-cf24f3fee5d6@tronnes.org/
- https://lore.kernel.org/dri-devel/c8f8015a-75da-afa8-ca7f-b2b134cacd16@gmail.com/

Unconditionally setting the 480i mode as DRM_MODE_TYPE_PREFERRED causes Xorg
(at least on current Raspberry Pi OS) to display garbage when
video=Composite1:PAL is specified on the command line, so I'm afraid this won't
do.

As I see it, there are three viable solutions for this issue:

a) Somehow query the video= command line option from this function, and set
   DRM_MODE_TYPE_PREFERRED appropriately. This would break the abstraction
   provided by global DRM code, but should work fine.

b) Modify drm_helper_probe_add_cmdline_mode() so that it sets
   DRM_MODE_TYPE_PREFERRED in addition to DRM_MODE_TYPE_USERDEF. This seems
   pretty robust, but affects the entire DRM subsystem, which may break
   userspace in different ways.

   - Maybe this could be mitigated by adding some additional conditions, e.g.
     setting the PREFERRED flag only if no modes are already flagged as such
     and/or only if the cmdline mode is a named one (~= analog TV mode)

c) Forcing userspace (Xorg / Raspberry Pi OS) to get fixed and honor the USERDEF
   flag.

Either way, hardcoding 480i as PREFERRED does not seem right.

Note: this also applies to the sun4i version (patch 22/22).

> @@ -366,13 +472,16 @@ static void vc4_vec_encoder_enable(struct drm_encoder *encoder,
>  	struct drm_connector *connector = &vec->connector;
>  	struct drm_connector_state *conn_state =
>  		drm_atomic_get_new_connector_state(state, connector);
> -	const struct vc4_vec_tv_mode *tv_mode =
> -		&vc4_vec_tv_modes[conn_state->tv.legacy_mode];
> +	const struct vc4_vec_tv_mode *tv_mode;
>  	int idx, ret;
>  
>  	if (!drm_dev_enter(drm, &idx))
>  		return;
>  
> +	tv_mode = vc4_vec_tv_mode_lookup(conn_state->tv.mode);
> +	if (!tv_mode)
> +		goto err_dev_exit;
> +
>  	ret = pm_runtime_get_sync(&vec->pdev->dev);
>  	if (ret < 0) {
>  		DRM_ERROR("Failed to retain power domain: %d\n", ret);

If this (!tv_mode) condition is somehow triggered, the power management goes
somewhat crazy. vc4_vec_encoder_enable() cannot return an error, so when
vc4_vec_encoder_disable() is eventually called after a failed enable, it hangs
in pm_runtime_put() for quite a bit.

At least I think that's what's happening. Anyway, to solve this, I'd propose
this thing below:

Best regards,
Mateusz Kwiatkowski