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SubjectRe: [PATCH v8 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 12/10/2022 15:02, 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.
>
> Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
> ---
> 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 13ce321..8ec9a13 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 9c6817b..d05b353 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;
> @@ -1288,7 +1282,7 @@ 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;
> @@ -1296,12 +1290,13 @@ 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);

So, what if the user commits the mode setting change on another CPU,
while we are handling the vblank callback here? Can this happen?

>
> DPU_ATRACE_END("encoder_vblank_callback");
> }
--
With best wishes
Dmitry

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