Am 17.03.21 um 16:43 schrieb Maxime Ripard:
The vc4_set_crtc_possible_masks is meant to run over all the encoders and then set their possible_crtcs mask to their associated pixelvalve.
However, since the commit 39fcb2808376 ("drm/vc4: txp: Turn the TXP into a CRTC of its own"), the TXP has been turned to a CRTC and encoder of its own, and while it does indeed register an encoder, it no longer has an associated pixelvalve. The code will thus run over the TXP encoder and set a bogus possible_crtcs mask, overriding the one set in the TXP bind function.
In order to fix this, let's skip any virtual encoder.
Fixes: 39fcb2808376 ("drm/vc4: txp: Turn the TXP into a CRTC of its own") Signed-off-by: Maxime Ripard maxime@cerno.tech
dim fixes 39fcb2808376 Fixes: 39fcb2808376 ("drm/vc4: txp: Turn the TXP into a CRTC of its own") Cc: Maxime Ripard maxime@cerno.tech Cc: Eric Anholt eric@anholt.net Cc: Maxime Ripard mripard@kernel.org Cc: stable@vger.kernel.org # v5.9+
At least the CC: stable line should be there.
Acked-by: Thomas Zimmermann tzimmermann@suse.de
drivers/gpu/drm/vc4/vc4_crtc.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c index 269390bc586e..f1f2e8cbce79 100644 --- a/drivers/gpu/drm/vc4/vc4_crtc.c +++ b/drivers/gpu/drm/vc4/vc4_crtc.c @@ -1018,6 +1018,9 @@ static void vc4_set_crtc_possible_masks(struct drm_device *drm, struct vc4_encoder *vc4_encoder; int i;
if (encoder->encoder_type == DRM_MODE_ENCODER_VIRTUAL)continue;- vc4_encoder = to_vc4_encoder(encoder); for (i = 0; i < ARRAY_SIZE(pv_data->encoder_types); i++) { if (vc4_encoder->type == encoder_types[i]) {