kms_writeback test cases also verify with a null fb for the writeback connector job. In addition there are also other commit paths which can result in kickoffs without a valid framebuffer like while closing the fb which results in the callback to drm_atomic_helper_dirtyfb() which internally triggers a commit.
Add protection in the dpu driver to ensure that commits for writeback encoders without a valid fb are gracefully skipped.
Signed-off-by: Abhinav Kumar quic_abhinavk@quicinc.com --- drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 9 +++++++++ drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 21 +++++++++++++++++++++ drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h | 6 ++++++ drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h | 1 + drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c | 12 ++++++++++++ 5 files changed, 49 insertions(+)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c index e7c9fe1..f7963b0 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c @@ -869,6 +869,13 @@ void dpu_crtc_commit_kickoff(struct drm_crtc *crtc)
DPU_ATRACE_BEGIN("crtc_commit");
+ drm_for_each_encoder_mask(encoder, crtc->dev, + crtc->state->encoder_mask) { + if (!dpu_encoder_has_valid_fb(encoder)) { + DRM_DEBUG_ATOMIC("invalid FB not kicking off crtc\n"); + goto end; + } + } /* * Encoder will flush/start now, unless it has a tx pending. If so, it * may delay and flush at an irq event (e.g. ppdone) @@ -891,6 +898,8 @@ void dpu_crtc_commit_kickoff(struct drm_crtc *crtc) dpu_encoder_kickoff(encoder);
reinit_completion(&dpu_crtc->frame_done_comp); + +end: DPU_ATRACE_END("crtc_commit"); }
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c index 3746432..e990dbc 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c @@ -1832,6 +1832,27 @@ void dpu_encoder_prepare_for_kickoff(struct drm_encoder *drm_enc) } }
+bool dpu_encoder_has_valid_fb(struct drm_encoder *drm_enc) +{ + struct dpu_encoder_virt *dpu_enc; + unsigned int i; + struct dpu_encoder_phys *phys; + + dpu_enc = to_dpu_encoder_virt(drm_enc); + + if (drm_enc->encoder_type == DRM_MODE_ENCODER_VIRTUAL) { + for (i = 0; i < dpu_enc->num_phys_encs; i++) { + phys = dpu_enc->phys_encs[i]; + if (phys->ops.has_valid_output_fb && !phys->ops.has_valid_output_fb(phys)) { + DPU_DEBUG("invalid FB not kicking off\n"); + return false; + } + } + } + + return true; +} + void dpu_encoder_kickoff(struct drm_encoder *drm_enc) { struct dpu_encoder_virt *dpu_enc; diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h index da5b6d6..63d90b8 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h @@ -187,4 +187,10 @@ void dpu_encoder_prepare_wb_job(struct drm_encoder *drm_enc, void dpu_encoder_cleanup_wb_job(struct drm_encoder *drm_enc, struct drm_writeback_job *job);
+/** + * dpu_encoder_has_valid_fb - cleanup writeback job for the encoder. + * @drm_enc: Pointer to drm encoder structure + */ +bool dpu_encoder_has_valid_fb(struct drm_encoder *drm_enc); + #endif /* __DPU_ENCODER_H__ */ diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h index 80da0a9..5b45b3c 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h @@ -151,6 +151,7 @@ struct dpu_encoder_phys_ops { struct drm_writeback_job *job); void (*cleanup_wb_job)(struct dpu_encoder_phys *phys_enc, struct drm_writeback_job *job); + bool (*has_valid_output_fb)(struct dpu_encoder_phys *phys_enc); };
/** diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c index 783f83e..7eeed79 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c @@ -717,6 +717,16 @@ static void dpu_encoder_phys_wb_cleanup_wb_job(struct dpu_encoder_phys *phys_enc wb_enc->wb_conn = NULL; }
+static bool dpu_encoder_phys_wb_has_valid_fb(struct dpu_encoder_phys *phys_enc) +{ + struct dpu_encoder_phys_wb *wb_enc = to_dpu_encoder_phys_wb(phys_enc); + + if (wb_enc->wb_job) + return true; + else + return false; +} + /** * dpu_encoder_phys_wb_init_ops - initialize writeback operations * @ops: Pointer to encoder operation table @@ -738,6 +748,8 @@ static void dpu_encoder_phys_wb_init_ops(struct dpu_encoder_phys_ops *ops) ops->prepare_wb_job = dpu_encoder_phys_wb_prepare_wb_job; ops->cleanup_wb_job = dpu_encoder_phys_wb_cleanup_wb_job; ops->irq_control = dpu_encoder_phys_wb_irq_ctrl; + ops->has_valid_output_fb = dpu_encoder_phys_wb_has_valid_fb; + }
/**