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Message-ID: <d9a502a2-9ad3-3b95-670a-3a67887ef54b@quicinc.com>
Date: Fri, 24 May 2024 12:58:53 -0700
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Rob Clark
<robdclark@...il.com>, Sean Paul <sean@...rly.run>,
Marijn Suijten
<marijn.suijten@...ainline.org>,
David Airlie <airlied@...il.com>, Daniel
Vetter <daniel@...ll.ch>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
<freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] Revert "drm/msm/dpu: drop
dpu_encoder_phys_ops.atomic_mode_set"
On 5/22/2024 3:24 AM, Dmitry Baryshkov wrote:
> In the DPU driver blank IRQ handling is called from a vblank worker and
> can happen outside of the irq_enable / irq_disable pair. Using the
> worker makes that completely asynchronous with the rest of the code.
> Revert commit d13f638c9b88 ("drm/msm/dpu: drop
> dpu_encoder_phys_ops.atomic_mode_set") to fix vblank IRQ assignment for
> CMD DSI panels.
>
> Call trace:
> dpu_encoder_phys_cmd_control_vblank_irq+0x218/0x294
> dpu_encoder_toggle_vblank_for_crtc+0x160/0x194
> dpu_crtc_vblank+0xbc/0x228
> dpu_kms_enable_vblank+0x18/0x24
> vblank_ctrl_worker+0x34/0x6c
> process_one_work+0x218/0x620
> worker_thread+0x1ac/0x37c
> kthread+0x114/0x118
> ret_from_fork+0x10/0x20
>
Thanks for the stack.
Agreed that vblank can be controlled asynchronously through the worker.
And I am guessing that the worker thread ran and printed this error
message because phys_enc->irq[INTR_IDX_VSYNC] was not valid as modeset
had not happened by then?
272 end:
273 if (ret) {
274 DRM_ERROR("vblank irq err id:%u pp:%d ret:%d, enable %s/%d\n",
275 DRMID(phys_enc->parent),
276 phys_enc->hw_pp->idx - PINGPONG_0, ret,
277 enable ? "true" : "false", refcount);
278 }
But how come this did not happen even with this revert.
IOW, I am still missing how moving the irq assignment back to modeset
from enable is fixing this?
> Fixes: d13f638c9b88 ("drm/msm/dpu: drop dpu_encoder_phys_ops.atomic_mode_set")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
> Changes in v2:
> - Expanded commit message to describe the reason for revert and added a
> call trace (Abhinav)
> - Link to v1: https://lore.kernel.org/r/20240514-dpu-revert-ams-v1-1-b13623d6cd5f@linaro.org
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 2 ++
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h | 5 ++++
> .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c | 32 ++++++++++++----------
> .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 13 +++++++--
> .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c | 11 +++++++-
> 5 files changed, 46 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 119f3ea50a7c..a7d8ecf3f5be 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -1200,6 +1200,8 @@ static void dpu_encoder_virt_atomic_mode_set(struct drm_encoder *drm_enc,
> phys->hw_ctl = to_dpu_hw_ctl(hw_ctl[i]);
>
> phys->cached_mode = crtc_state->adjusted_mode;
> + if (phys->ops.atomic_mode_set)
> + phys->ops.atomic_mode_set(phys, crtc_state, conn_state);
> }
> }
>
> 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 002e89cc1705..30470cd15a48 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> @@ -69,6 +69,8 @@ struct dpu_encoder_phys;
> * @is_master: Whether this phys_enc is the current master
> * encoder. Can be switched at enable time. Based
> * on split_role and current mode (CMD/VID).
> + * @atomic_mode_set: DRM Call. Set a DRM mode.
> + * This likely caches the mode, for use at enable.
> * @enable: DRM Call. Enable a DRM mode.
> * @disable: DRM Call. Disable mode.
> * @control_vblank_irq Register/Deregister for VBLANK IRQ
> @@ -93,6 +95,9 @@ struct dpu_encoder_phys;
> struct dpu_encoder_phys_ops {
> void (*prepare_commit)(struct dpu_encoder_phys *encoder);
> bool (*is_master)(struct dpu_encoder_phys *encoder);
> + void (*atomic_mode_set)(struct dpu_encoder_phys *encoder,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state);
> void (*enable)(struct dpu_encoder_phys *encoder);
> void (*disable)(struct dpu_encoder_phys *encoder);
> int (*control_vblank_irq)(struct dpu_encoder_phys *enc, bool enable);
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> index 489be1c0c704..95cd39b49668 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> @@ -142,6 +142,23 @@ static void dpu_encoder_phys_cmd_underrun_irq(void *arg)
> dpu_encoder_underrun_callback(phys_enc->parent, phys_enc);
> }
>
> +static void dpu_encoder_phys_cmd_atomic_mode_set(
> + struct dpu_encoder_phys *phys_enc,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state)
> +{
> + phys_enc->irq[INTR_IDX_CTL_START] = phys_enc->hw_ctl->caps->intr_start;
> +
> + phys_enc->irq[INTR_IDX_PINGPONG] = phys_enc->hw_pp->caps->intr_done;
> +
> + if (phys_enc->has_intf_te)
> + phys_enc->irq[INTR_IDX_RDPTR] = phys_enc->hw_intf->cap->intr_tear_rd_ptr;
> + else
> + phys_enc->irq[INTR_IDX_RDPTR] = phys_enc->hw_pp->caps->intr_rdptr;
> +
> + phys_enc->irq[INTR_IDX_UNDERRUN] = phys_enc->hw_intf->cap->intr_underrun;
> +}
> +
> static int _dpu_encoder_phys_cmd_handle_ppdone_timeout(
> struct dpu_encoder_phys *phys_enc)
> {
> @@ -280,14 +297,6 @@ static void dpu_encoder_phys_cmd_irq_enable(struct dpu_encoder_phys *phys_enc)
> phys_enc->hw_pp->idx - PINGPONG_0,
> phys_enc->vblank_refcount);
>
> - phys_enc->irq[INTR_IDX_CTL_START] = phys_enc->hw_ctl->caps->intr_start;
> - phys_enc->irq[INTR_IDX_PINGPONG] = phys_enc->hw_pp->caps->intr_done;
> -
> - if (phys_enc->has_intf_te)
> - phys_enc->irq[INTR_IDX_RDPTR] = phys_enc->hw_intf->cap->intr_tear_rd_ptr;
> - else
> - phys_enc->irq[INTR_IDX_RDPTR] = phys_enc->hw_pp->caps->intr_rdptr;
> -
> dpu_core_irq_register_callback(phys_enc->dpu_kms,
> phys_enc->irq[INTR_IDX_PINGPONG],
> dpu_encoder_phys_cmd_pp_tx_done_irq,
> @@ -318,10 +327,6 @@ static void dpu_encoder_phys_cmd_irq_disable(struct dpu_encoder_phys *phys_enc)
> dpu_core_irq_unregister_callback(phys_enc->dpu_kms, phys_enc->irq[INTR_IDX_UNDERRUN]);
> dpu_encoder_phys_cmd_control_vblank_irq(phys_enc, false);
> dpu_core_irq_unregister_callback(phys_enc->dpu_kms, phys_enc->irq[INTR_IDX_PINGPONG]);
> -
> - phys_enc->irq[INTR_IDX_CTL_START] = 0;
> - phys_enc->irq[INTR_IDX_PINGPONG] = 0;
> - phys_enc->irq[INTR_IDX_RDPTR] = 0;
> }
>
> static void dpu_encoder_phys_cmd_tearcheck_config(
> @@ -698,6 +703,7 @@ static void dpu_encoder_phys_cmd_init_ops(
> struct dpu_encoder_phys_ops *ops)
> {
> ops->is_master = dpu_encoder_phys_cmd_is_master;
> + ops->atomic_mode_set = dpu_encoder_phys_cmd_atomic_mode_set;
> ops->enable = dpu_encoder_phys_cmd_enable;
> ops->disable = dpu_encoder_phys_cmd_disable;
> ops->control_vblank_irq = dpu_encoder_phys_cmd_control_vblank_irq;
> @@ -736,8 +742,6 @@ struct dpu_encoder_phys *dpu_encoder_phys_cmd_init(struct drm_device *dev,
>
> dpu_encoder_phys_cmd_init_ops(&phys_enc->ops);
> phys_enc->intf_mode = INTF_MODE_CMD;
> - phys_enc->irq[INTR_IDX_UNDERRUN] = phys_enc->hw_intf->cap->intr_underrun;
> -
> cmd_enc->stream_sel = 0;
>
> if (!phys_enc->hw_intf) {
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> index ef69c2f408c3..636a97432d51 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> @@ -356,6 +356,16 @@ static bool dpu_encoder_phys_vid_needs_single_flush(
> return phys_enc->split_role != ENC_ROLE_SOLO;
> }
>
> +static void dpu_encoder_phys_vid_atomic_mode_set(
> + struct dpu_encoder_phys *phys_enc,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state)
> +{
> + phys_enc->irq[INTR_IDX_VSYNC] = phys_enc->hw_intf->cap->intr_vsync;
> +
> + phys_enc->irq[INTR_IDX_UNDERRUN] = phys_enc->hw_intf->cap->intr_underrun;
> +}
> +
> static int dpu_encoder_phys_vid_control_vblank_irq(
> struct dpu_encoder_phys *phys_enc,
> bool enable)
> @@ -699,6 +709,7 @@ static int dpu_encoder_phys_vid_get_frame_count(
> static void dpu_encoder_phys_vid_init_ops(struct dpu_encoder_phys_ops *ops)
> {
> ops->is_master = dpu_encoder_phys_vid_is_master;
> + ops->atomic_mode_set = dpu_encoder_phys_vid_atomic_mode_set;
> ops->enable = dpu_encoder_phys_vid_enable;
> ops->disable = dpu_encoder_phys_vid_disable;
> ops->control_vblank_irq = dpu_encoder_phys_vid_control_vblank_irq;
> @@ -737,8 +748,6 @@ struct dpu_encoder_phys *dpu_encoder_phys_vid_init(struct drm_device *dev,
>
> dpu_encoder_phys_vid_init_ops(&phys_enc->ops);
> phys_enc->intf_mode = INTF_MODE_VIDEO;
> - phys_enc->irq[INTR_IDX_VSYNC] = phys_enc->hw_intf->cap->intr_vsync;
> - phys_enc->irq[INTR_IDX_UNDERRUN] = phys_enc->hw_intf->cap->intr_underrun;
>
> DPU_DEBUG_VIDENC(phys_enc, "created intf idx:%d\n", p->hw_intf->idx);
>
> 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 d3ea91c1d7d2..356dca5e5ea9 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
> @@ -404,6 +404,15 @@ static void dpu_encoder_phys_wb_irq_disable(struct dpu_encoder_phys *phys)
> dpu_core_irq_unregister_callback(phys->dpu_kms, phys->irq[INTR_IDX_WB_DONE]);
> }
>
> +static void dpu_encoder_phys_wb_atomic_mode_set(
> + struct dpu_encoder_phys *phys_enc,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state)
> +{
> +
> + phys_enc->irq[INTR_IDX_WB_DONE] = phys_enc->hw_wb->caps->intr_wb_done;
> +}
> +
> static void _dpu_encoder_phys_wb_handle_wbdone_timeout(
> struct dpu_encoder_phys *phys_enc)
> {
> @@ -640,6 +649,7 @@ static bool dpu_encoder_phys_wb_is_valid_for_commit(struct dpu_encoder_phys *phy
> static void dpu_encoder_phys_wb_init_ops(struct dpu_encoder_phys_ops *ops)
> {
> ops->is_master = dpu_encoder_phys_wb_is_master;
> + ops->atomic_mode_set = dpu_encoder_phys_wb_atomic_mode_set;
> ops->enable = dpu_encoder_phys_wb_enable;
> ops->disable = dpu_encoder_phys_wb_disable;
> ops->wait_for_commit_done = dpu_encoder_phys_wb_wait_for_commit_done;
> @@ -685,7 +695,6 @@ struct dpu_encoder_phys *dpu_encoder_phys_wb_init(struct drm_device *dev,
>
> dpu_encoder_phys_wb_init_ops(&phys_enc->ops);
> phys_enc->intf_mode = INTF_MODE_WB_LINE;
> - phys_enc->irq[INTR_IDX_WB_DONE] = phys_enc->hw_wb->caps->intr_wb_done;
>
> atomic_set(&wb_enc->wbirq_refcount, 0);
>
>
> ---
> base-commit: 75fa778d74b786a1608d55d655d42b480a6fa8bd
> change-id: 20240514-dpu-revert-ams-9410abc1ee48
>
> Best regards,
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