On 1/21/22 14:12, Alexander Stein wrote:
Do not deference the NULL pointer if the bridge does not return a bridge state. Assume a fixed format instead.Fixes: commit b776b0f00f24 ("drm: mxsfb: Use bus_format from the nearest bridge if present") Signed-off-by: Alexander Stein <alexander.st...@ew.tq-group.com> --- This can happen if a "ti,sn75lvds83", "lvds-encoder" bridge is attached to it. atomic_get_input_bus_fmts is only implemented for the lvds-decoder case. drivers/gpu/drm/mxsfb/mxsfb_kms.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c index 0655582ae8ed..4cfb6c001679 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c @@ -361,7 +361,11 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc, bridge_state = drm_atomic_get_new_bridge_state(state, mxsfb->bridge); - bus_format = bridge_state->input_bus_cfg.format; + if (!bridge_state) + bus_format = MEDIA_BUS_FMT_FIXED; + else + bus_format = bridge_state->input_bus_cfg.format; + if (bus_format == MEDIA_BUS_FMT_FIXED) { dev_warn_once(drm->dev, "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
Shouldn't this be fixed on the bridge driver side instead ? Which bridge driver do you use ?
