Re: [PATCH v9 01/15] drm/msm/disp/dpu: clear dpu_assign_crtc and get crtc from connector state instead of dpu_enc

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On 21/12/2022 16:10, Vinod Polimera wrote:


-----Original Message-----
From: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Sent: Wednesday, December 14, 2022 9:05 PM
To: Vinod Polimera (QUIC) <quic_vpolimer@xxxxxxxxxxx>; dri-
devel@xxxxxxxxxxxxxxxxxxxxx; linux-arm-msm@xxxxxxxxxxxxxxx;
freedreno@xxxxxxxxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx; robdclark@xxxxxxxxx;
dianders@xxxxxxxxxxxx; swboyd@xxxxxxxxxxxx; Kalyan Thota (QUIC)
<quic_kalyant@xxxxxxxxxxx>; Kuogee Hsieh (QUIC)
<quic_khsieh@xxxxxxxxxxx>; Vishnuvardhan Prodduturi (QUIC)
<quic_vproddut@xxxxxxxxxxx>; Bjorn Andersson (QUIC)
<quic_bjorande@xxxxxxxxxxx>; Aravind Venkateswaran (QUIC)
<quic_aravindh@xxxxxxxxxxx>; Abhinav Kumar (QUIC)
<quic_abhinavk@xxxxxxxxxxx>; Sankeerth Billakanti (QUIC)
<quic_sbillaka@xxxxxxxxxxx>
Subject: Re: [PATCH v9 01/15] drm/msm/disp/dpu: clear dpu_assign_crtc and
get crtc from connector state instead of dpu_enc

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On 14/12/2022 12:05, Vinod Polimera wrote:
Update crtc retrieval from dpu_enc to dpu_enc connector state,
since new links get set as part of the dpu enc virt mode set.
The dpu_enc->crtc cache is no more needed, hence cleaning it as
part of this change.

This patch is dependent on the series:
https://patchwork.freedesktop.org/series/110969/

Signed-off-by: Vinod Polimera <quic_vpolimer@xxxxxxxxxxx>
---
   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    |  4 ---
   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 42 +++++++++---------
-----------
   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h |  8 ------
   3 files changed, 13 insertions(+), 41 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 3f72d38..289d51e 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1029,7 +1029,6 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
                */
               if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_VIDEO)
                       release_bandwidth = true;
-             dpu_encoder_assign_crtc(encoder, NULL);
       }

       /* wait for frame_event_done completion */
@@ -1099,9 +1098,6 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
       trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
       dpu_crtc->enabled = true;

-     drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state-
encoder_mask)
-             dpu_encoder_assign_crtc(encoder, crtc);
-
       /* Enable/restore vblank irq handling */
       drm_crtc_vblank_on(crtc);
   }
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index a585036..b9b254d 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -132,11 +132,6 @@ enum dpu_enc_rc_states {
    * @intfs_swapped:  Whether or not the phys_enc interfaces have been
swapped
    *                  for partial update right-only cases, such as pingpong
    *                  split where virtual pingpong does not generate IRQs
- * @crtc:            Pointer to the currently assigned crtc. Normally you
- *                   would use crtc->state->encoder_mask to determine the
- *                   link between encoder/crtc. However in this case we need
- *                   to track crtc in the disable() hook which is called
- *                   _after_ encoder_mask is cleared.
    * @connector:              If a mode is set, cached pointer to the active
connector
    * @crtc_kickoff_cb:                Callback into CRTC that will flush & start
    *                          all CTL paths
@@ -181,7 +176,6 @@ struct dpu_encoder_virt {

       bool intfs_swapped;

-     struct drm_crtc *crtc;
       struct drm_connector *connector;

       struct dentry *debugfs_root;
@@ -1317,7 +1311,7 @@ static void dpu_encoder_vblank_callback(struct
drm_encoder *drm_enc,
               struct dpu_encoder_phys *phy_enc)
   {
       struct dpu_encoder_virt *dpu_enc = NULL;
-     unsigned long lock_flags;
+     struct drm_crtc *crtc;

       if (!drm_enc || !phy_enc)
               return;
@@ -1325,12 +1319,13 @@ static void dpu_encoder_vblank_callback(struct
drm_encoder *drm_enc,
       DPU_ATRACE_BEGIN("encoder_vblank_callback");
       dpu_enc = to_dpu_encoder_virt(drm_enc);

-     atomic_inc(&phy_enc->vsync_cnt);
+     if (!dpu_enc->connector || !dpu_enc->connector->state ||
+         !dpu_enc->connector->state->crtc)
+             return;

-     spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
-     if (dpu_enc->crtc)
-             dpu_crtc_vblank_callback(dpu_enc->crtc);
-     spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
+     atomic_inc(&phy_enc->vsync_cnt);
+     crtc = dpu_enc->connector->state->crtc;
+     dpu_crtc_vblank_callback(crtc);

       DPU_ATRACE_END("encoder_vblank_callback");
   }
@@ -1353,33 +1348,22 @@ static void
dpu_encoder_underrun_callback(struct drm_encoder *drm_enc,
       DPU_ATRACE_END("encoder_underrun_callback");
   }

-void dpu_encoder_assign_crtc(struct drm_encoder *drm_enc, struct
drm_crtc *crtc)
-{
-     struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
-     unsigned long lock_flags;
-
-     spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
-     /* crtc should always be cleared before re-assigning */
-     WARN_ON(crtc && dpu_enc->crtc);
-     dpu_enc->crtc = crtc;
-     spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
-}
-
   void dpu_encoder_toggle_vblank_for_crtc(struct drm_encoder
*drm_enc,
                                       struct drm_crtc *crtc, bool enable)
   {
       struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
-     unsigned long lock_flags;
+     struct drm_crtc *new_crtc;
       int i;

       trace_dpu_enc_vblank_cb(DRMID(drm_enc), enable);

-     spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
-     if (dpu_enc->crtc != crtc) {
-             spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
+     if (!dpu_enc->connector || !dpu_enc->connector->state)
+             return;
+
+     new_crtc = dpu_enc->connector->state->crtc;
+     if (!new_crtc || new_crtc != crtc) {

I don't like going through all the pointers and states without locks.
The connector->state can potentially check. So, I'd propose even simpler
solution: just store the crtc in the dpu_enc at the creation time. Then
you can use the rest of the current dpu_enc->crtc as expected.

Can i do as below.
After encoder to crtc is pinned, i can update dpu_encoder structure that is attached with drm_enc with the crtc created during drm_obj_init

@@ -816,6 +816,7 @@ static int _dpu_kms_drm_obj_init(struct dpu_kms *dpu_kms)
                 }
                 priv->crtcs[priv->num_crtcs++] = crtc;
                 encoder->possible_crtcs = 1 << drm_crtc_index(crtc);
               + dpu_encoder_assign_crtc(encoder, crtc);
                 i++;
         }

Yes.


               return;
       }
-     spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);

       for (i = 0; i < dpu_enc->num_phys_encs; i++) {
               struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
index 7f3d823..eb9fc7c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
@@ -40,14 +40,6 @@ struct msm_display_info {
   };

   /**
- * dpu_encoder_assign_crtc - Link the encoder to the crtc it's assigned to
- * @encoder: encoder pointer
- * @crtc:    crtc pointer
- */
-void dpu_encoder_assign_crtc(struct drm_encoder *encoder,
-                          struct drm_crtc *crtc);
-
-/**
    * dpu_encoder_toggle_vblank_for_crtc - Toggles vblank interrupts on or
off if
    *  the encoder is assigned to the given crtc
    * @encoder:        encoder pointer

--
With best wishes
Dmitry


--
With best wishes
Dmitry




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