On Fri, 1 Nov 2019 at 07:46, Manasi Navare <manasi.d.navare@xxxxxxxxx> 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>
> ---
> 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 ++;
Drop the space before the ++ here. Maybe just make this
if (connectors[i]->has_tile)
num_tiled_conns++;
Reviewed-by: Dave Airlie <airlied@xxxxxxxxxx>
Otherwise I think this seems fine, though it does beg the question in
my mind of what happens if I get 2 8K monitors, and plug the first
tile of one in, and the second tile of the other in.
Dave.
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