DRM Fb driver expects multiple CRTCs if it sees connector->has_tile is set, but we need to handle tile support and look for multiple CRTCs only for the modes that match the tile size. The other modes should be able to be displayed without tile support or uisng single CRTC.

This patch adds the check to match the tile size with requested mode to handle the tile support.

Cc: Ville Syrjälä ville.syrjala@linux.intel.com Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Jani Nikula jani.nikula@intel.com Cc: Dave Airlie airlied@redhat.com Signed-off-by: Manasi Navare manasi.d.navare@intel.com --- drivers/gpu/drm/drm_fb_helper.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index a7ba5b4902d6..ab11e86dd6d5 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -1613,7 +1613,9 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, for (j = 0; j < mode_set->num_connectors; j++) { struct drm_connector *connector = mode_set->connectors[j];

- if (connector->has_tile) { + if (connector->has_tile && + desired_mode->hdisplay == connector->tile_h_size && + desired_mode->vdisplay == connector->tile_v_size) { lasth = (connector->tile_h_loc == (connector->num_h_tile - 1)); lastv = (connector->tile_v_loc == (connector->num_v_tile - 1)); /* cloning to multiple tiles is just crazy-talk, so: */