On Thu, Oct 31, 2019 at 02:48:39PM -0700, Manasi Navare wrote:
> In case of tiled displays, if we hotplug just one connector,
> fbcon currently just selects the preferred mode and if it is
> tiled mode then that becomes a problem if rest of the tiles are
> not present.
> So in the fbdev driver on hotplug when we probe the client modeset,
> we we dont find all the connectors for all tiles, then on a connector
> with one tile, just fallback to the first available non tiled mode
> to display over a single connector.
>
> Suggested-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Suggested-by: Dave Airlie <airlied@xxxxxxxxxx>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Dave Airlie <airlied@xxxxxxxxxx>
> Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Hm, should we mayb have a slight timeout first to wait for the 2nd
connector? Otherwise lots of flickering going on when plugging in one of
these screens ...
-Daniel
> ---
> drivers/gpu/drm/drm_client_modeset.c | 29 ++++++++++++++++++++++++++++
> 1 file changed, 29 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c
> index 895b73f23079..e28a723587db 100644
> --- a/drivers/gpu/drm/drm_client_modeset.c
> +++ b/drivers/gpu/drm/drm_client_modeset.c
> @@ -114,6 +114,20 @@ drm_client_find_modeset(struct drm_client_dev *client, struct drm_crtc *crtc)
> return NULL;
> }
>
> +static struct drm_display_mode *
> +drm_connector_fallback_non_tiled_mode(struct drm_connector *connector)
> +{
> + struct drm_display_mode *mode;
> +
> + list_for_each_entry(mode, &connector->modes, head) {
> + if (mode->hdisplay == connector->tile_h_size &&
> + mode->vdisplay == connector->tile_v_size)
> + continue;
> + return mode;
> + }
> + return NULL;
> +}
> +
> static struct drm_display_mode *
> drm_connector_has_preferred_mode(struct drm_connector *connector, int width, int height)
> {
> @@ -348,8 +362,17 @@ static bool drm_client_target_preferred(struct drm_connector **connectors,
> struct drm_connector *connector;
> u64 conn_configured = 0;
> int tile_pass = 0;
> + int num_tiled_conns = 0;
> int i;
>
> + for (i = 0; i < connector_count; i++) {
> + connector = connectors[i];
> + if (!connector->has_tile)
> + continue;
> +
> + num_tiled_conns ++;
> + }
> +
> retry:
> for (i = 0; i < connector_count; i++) {
> connector = connectors[i];
> @@ -394,6 +417,12 @@ static bool drm_client_target_preferred(struct drm_connector **connectors,
> connector->base.id, connector->tile_group ? connector->tile_group->id : 0);
> modes[i] = drm_connector_has_preferred_mode(connector, width, height);
> }
> + if (connector->has_tile &&
> + num_tiled_conns < connector->num_h_tile * connector->num_v_tile) {
> + DRM_DEBUG_KMS("Falling back to non tiled mode on Connector %d\n",
> + connector->base.id);
> + modes[i] = drm_connector_fallback_non_tiled_mode(connector);
> + }
> /* No preferred modes, pick one off the list */
> if (!modes[i] && !list_empty(&connector->modes)) {
> list_for_each_entry(modes[i], &connector->modes, head)
> --
> 2.19.1
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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