From: Ville Syrjälä <ville.syrj...@linux.intel.com> Many drivers are populating encoder->possible_clones wrong. Let's persuade them to get it right by adding some loud WARNs.
We'll cross check the bits between any two encoders. So either both encoders can clone with the other, or neither can. We'll also complain about effectively empty possible_clones, and possible_clones containing bits for encoders that don't exist. TODO: Or should we just silently filter out any bits for non-existing encoders? v2: encoder->possible_clones now includes the encoder itelf Cc: Thomas Zimmermann <tzimmerm...@suse.de> Cc: Daniel Vetter <dan...@ffwll.ch> Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com> --- drivers/gpu/drm/drm_encoder.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c index f761d9306028..bc2246f27e0d 100644 --- a/drivers/gpu/drm/drm_encoder.c +++ b/drivers/gpu/drm/drm_encoder.c @@ -79,6 +79,34 @@ static void fixup_possible_clones(struct drm_device *dev) encoder->possible_clones |= drm_encoder_mask(encoder); } +static void validate_possible_clones(struct drm_encoder *encoder) +{ + struct drm_device *dev = encoder->dev; + struct drm_encoder *other; + u32 encoder_mask = 0; + + drm_for_each_encoder(other, dev) { + encoder_mask |= drm_encoder_mask(other); + + WARN(!(encoder->possible_clones & drm_encoder_mask(other)) != + !(other->possible_clones & drm_encoder_mask(encoder)), + "possible_clones mismatch: " + "[ENCODER:%d:%s] mask=0x%x possible_clones=0x%x vs. " + "[ENCODER:%d:%s] mask=0x%x possible_clones=0x%x\n", + encoder->base.id, encoder->name, + drm_encoder_mask(encoder), encoder->possible_clones, + other->base.id, other->name, + drm_encoder_mask(other), other->possible_clones); + } + + WARN((encoder->possible_clones & drm_encoder_mask(encoder)) == 0 || + (encoder->possible_clones & ~encoder_mask) != 0, + "Bogus possible_clones: " + "[ENCODER:%d:%s] possible_clones=0x%x (full encoder mask=0x%x)\n", + encoder->base.id, encoder->name, + encoder->possible_clones, encoder_mask); +} + int drm_encoder_register_all(struct drm_device *dev) { struct drm_encoder *encoder; @@ -87,6 +115,8 @@ int drm_encoder_register_all(struct drm_device *dev) fixup_possible_clones(dev); drm_for_each_encoder(encoder, dev) { + validate_possible_clones(encoder); + if (encoder->funcs->late_register) ret = encoder->funcs->late_register(encoder); if (ret) -- 2.24.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx