We currently create CRTCs equaling to the # of Layer Mixer blocks we
have on the MDP5 HW. This number is generally more than the # of encoders
(INTFs) we have in the MDSS HW. The number of encoders connected to
displays on the platform (as described by DT) would be even lesser.
Create only N drm_crtcs, where N is the number of drm_encoders
successfully registered. To do this, we call modeset_init_intf() before
we init the drm_crtcs and drm_planes.
Because of this change, setting encoder->possible_crtcs needs to be moved
from construct_encoder() to a later point when we know how many CRTCs we
have.
Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
---
drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c | 39 ++++++++++++++++++++++++---------
1 file changed, 29 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
index 9794cad131cd..ecfa38949aea 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
@@ -293,7 +293,6 @@ static struct drm_encoder *construct_encoder(struct mdp5_kms *mdp5_kms,
return encoder;
}
- encoder->possible_crtcs = (1 << priv->num_crtcs) - 1;
priv->encoders[priv->num_encoders++] = encoder;
return encoder;
@@ -411,16 +410,35 @@ static int modeset_init(struct mdp5_kms *mdp5_kms)
struct drm_device *dev = mdp5_kms->dev;
struct msm_drm_private *priv = dev->dev_private;
const struct mdp5_cfg_hw *hw_cfg;
+ unsigned int num_crtcs;
int i, ret;
hw_cfg = mdp5_cfg_get_hw_config(mdp5_kms->cfg);
- /* Construct planes equaling the number of hw pipes, and CRTCs
- * for the N layer-mixers (LM). The first N planes become primary
+ /*
+ * Construct encoders and modeset initialize connector devices
+ * for each external display interface.
+ */
+ for (i = 0; i < ARRAY_SIZE(hw_cfg->intf.connect); i++) {
+ ret = modeset_init_intf(mdp5_kms, i);
+ if (ret)
+ goto fail;
+ }
+
+ /*
+ * We should ideally have less number of encoders (set up by parsing
+ * the MDP5 interfaces) than the number of layer mixers present in HW,
+ * but let's be safe here anyway
+ */
+ num_crtcs = min(priv->num_encoders, mdp5_cfg->lm.count);
+
+ /*
+ * Construct planes equaling the number of hw pipes, and CRTCs for the
+ * N encoders set up by the driver. The first N planes become primary
* planes for the CRTCs, with the remainder as overlay planes:
*/
for (i = 0; i < mdp5_kms->num_hwpipes; i++) {
- bool primary = i < mdp5_cfg->lm.count;
+ bool primary = i < num_crtcs;
struct drm_plane *plane;
struct drm_crtc *crtc;
@@ -444,13 +462,14 @@ static int modeset_init(struct mdp5_kms *mdp5_kms)
priv->crtcs[priv->num_crtcs++] = crtc;
}
- /* Construct encoders and modeset initialize connector devices
- * for each external display interface.
+ /*
+ * Now that we know the number of crtcs we've created, set the possible
+ * crtcs for the encoders
*/
- for (i = 0; i < ARRAY_SIZE(hw_cfg->intf.connect); i++) {
- ret = modeset_init_intf(mdp5_kms, i);
- if (ret)
- goto fail;
+ for (i = 0; i < priv->num_encoders; i++) {
+ struct drm_encoder *encoder = priv->encoders[i];
+
+ encoder->possible_crtcs = (1 << priv->num_crtcs) - 1;
}
return 0;
--
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