On Wed, Dec 11, 2019 at 01:24:32PM -0800, Manasi Navare wrote:
> 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@xxxxxxxxxxxxxxx>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> Cc: Dave Airlie <airlied@xxxxxxxxxx>
> Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Capturing Dave Airlie's r-b from IRC:
Reviewed-by: Dave Airlie <airlied@xxxxxxxxxx>
Manasi
> ---
> 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 fb9bff0f4581..4978363714a9 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -1558,7 +1558,9 @@ 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: */
> --
> 2.19.1
>
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