From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
WARN if the encoder possible_crtcs is effectively empty or contains
bits for non-existing crtcs.
v2: Move to drm_mode_config_validate() (Daniel)
Make the docs say we WARN when this is wrong (Daniel)
Extract full_crtc_mask()
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_mode_config.c | 27 ++++++++++++++++++++++++++-
include/drm/drm_encoder.h | 2 +-
2 files changed, 27 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index afc91447293a..4c1b350ddb95 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -581,6 +581,29 @@ static void validate_encoder_possible_clones(struct drm_encoder *encoder)
encoder->possible_clones, encoder_mask);
}
+static u32 full_crtc_mask(struct drm_device *dev)
+{
+ struct drm_crtc *crtc;
+ u32 crtc_mask = 0;
+
+ drm_for_each_crtc(crtc, dev)
+ crtc_mask |= drm_crtc_mask(crtc);
+
+ return crtc_mask;
+}
+
+static void validate_encoder_possible_crtcs(struct drm_encoder *encoder)
+{
+ u32 crtc_mask = full_crtc_mask(encoder->dev);
+
+ WARN((encoder->possible_crtcs & crtc_mask) == 0 ||
+ (encoder->possible_crtcs & ~crtc_mask) != 0,
+ "Bogus possible_crtcs: "
+ "[ENCODER:%d:%s] possible_crtcs=0x%x (full crtc mask=0x%x)\n",
+ encoder->base.id, encoder->name,
+ encoder->possible_crtcs, crtc_mask);
+}
+
void drm_mode_config_validate(struct drm_device *dev)
{
struct drm_encoder *encoder;
@@ -588,6 +611,8 @@ void drm_mode_config_validate(struct drm_device *dev)
drm_for_each_encoder(encoder, dev)
fixup_encoder_possible_clones(encoder);
- drm_for_each_encoder(encoder, dev)
+ drm_for_each_encoder(encoder, dev) {
validate_encoder_possible_clones(encoder);
+ validate_encoder_possible_crtcs(encoder);
+ }
}
diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h
index 3741963b9587..b236269f41ac 100644
--- a/include/drm/drm_encoder.h
+++ b/include/drm/drm_encoder.h
@@ -142,7 +142,7 @@ struct drm_encoder {
* the bits for all &drm_crtc objects this encoder can be connected to
* before calling drm_dev_register().
*
- * In reality almost every driver gets this wrong.
+ * You will get a WARN if you get this wrong in the driver.
*
* Note that since CRTC objects can't be hotplugged the assigned indices
* are stable and hence known before registering all objects.
--
2.24.1
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