On Fri, Feb 07, 2020 at 03:59:50PM +0200, Ville Syrjala wrote:
From: Ville Syrjälä ville.syrjala@linux.intel.com
WARN if the encoder possible_crtcs is effectively empty or contains bits for non-existing crtcs.
TODO: Or should we perhapst just filter out any bit for a non-exisiting crtc?
Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Daniel Vetter daniel@ffwll.ch Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com
From a quick grep it looks like at least most drivers seem to get this
right. Worth a shot to find the hold-outs.
Two things: - Imo also best to move into the drm_mode_config_validate I suggested. - Please update the kerneldoc for drm_encoder.possible_crtcs to mention that this will WARN if you get it wrong (and maybe remove the line that most drivers screw this up).
Check itself lgtm. -Daniel
drivers/gpu/drm/drm_encoder.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c index bc2246f27e0d..f16b2a2518d7 100644 --- a/drivers/gpu/drm/drm_encoder.c +++ b/drivers/gpu/drm/drm_encoder.c @@ -107,6 +107,23 @@ static void validate_possible_clones(struct drm_encoder *encoder) encoder->possible_clones, encoder_mask); }
+static void validate_possible_crtcs(struct drm_encoder *encoder) +{
- struct drm_device *dev = encoder->dev;
- struct drm_crtc *crtc;
- u32 crtc_mask = 0;
- drm_for_each_crtc(crtc, dev)
crtc_mask |= drm_crtc_mask(crtc);- 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);+}
int drm_encoder_register_all(struct drm_device *dev) { struct drm_encoder *encoder; @@ -115,6 +132,7 @@ int drm_encoder_register_all(struct drm_device *dev) fixup_possible_clones(dev);
drm_for_each_encoder(encoder, dev) {
validate_possible_crtcs(encoder);validate_possible_clones(encoder);
if (encoder->funcs->late_register)
-- 2.24.1