Re: [PATCH v2 15/24] drm/msm: dpu: Stop using encoder->crtc pointer

Jeykumar Sankaran
2018-11-16T20:05:09Z

On 2018-11-16 10:42, Sean Paul wrote:
> From: Sean Paul <seanpaul@chromium.org>
>
> It's for legacy drivers, for atomic drivers crtc->state->encoder_mask
> should be used to map encoder to crtc.
>
> Changes in v2:
> - None
>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 46 ++++++++----------------
> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 19 +++++++---
> 2 files changed, 29 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 156f4c77ca44..a008a87a8113 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -284,9 +284,9 @@ enum dpu_intf_mode dpu_crtc_get_intf_mode(struct
> drm_crtc *crtc)
> return INTF_MODE_NONE;
> }
>
> - drm_for_each_encoder(encoder, crtc->dev)
> - if (encoder->crtc == crtc)
> - return dpu_encoder_get_intf_mode(encoder);
> + /* TODO: Returns the first INTF_MODE, could there be multiple
> values? */
> + drm_for_each_encoder_mask(encoder, crtc->dev,
> crtc->state->encoder_mask)
> + return dpu_encoder_get_intf_mode(encoder);
>
> return INTF_MODE_NONE;
> }
> @@ -551,13 +551,9 @@ static void dpu_crtc_atomic_begin(struct drm_crtc
> *crtc,
> spin_unlock_irqrestore(&dev->event_lock, flags);
> }
>
> - list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
> {
> - if (encoder->crtc != crtc)
> - continue;
> -
> - /* encoder will trigger pending mask now */
> + /* encoder will trigger pending mask now */
> + drm_for_each_encoder_mask(encoder, crtc->dev,
> crtc->state->encoder_mask)
> dpu_encoder_trigger_kickoff_pending(encoder);
> - }
>
> /*
> * If no mixers have been allocated in dpu_crtc_atomic_check(),
> @@ -704,7 +700,6 @@ static int _dpu_crtc_wait_for_frame_done(struct
> drm_crtc *crtc)
> void dpu_crtc_commit_kickoff(struct drm_crtc *crtc)
> {
> struct drm_encoder *encoder;
> - struct drm_device *dev = crtc->dev;
> struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> struct dpu_kms *dpu_kms = _dpu_crtc_get_kms(crtc);
> struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc->state);
> @@ -720,16 +715,13 @@ void dpu_crtc_commit_kickoff(struct drm_crtc
> *crtc)
>
> DPU_ATRACE_BEGIN("crtc_commit");
>
> - list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
> {
> + /*
> + * 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)
> + */
> + drm_for_each_encoder_mask(encoder, crtc->dev,
> + crtc->state->encoder_mask) {
> struct dpu_encoder_kickoff_params params = { 0 };
> -
> - if (encoder->crtc != crtc)
> - continue;
> -
> - /*
> - * 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)
> - */
> dpu_encoder_prepare_for_kickoff(encoder, &params);
> }
>
> @@ -754,12 +746,8 @@ void dpu_crtc_commit_kickoff(struct drm_crtc
> *crtc)
>
> dpu_vbif_clear_errors(dpu_kms);
>
> - list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
> {
> - if (encoder->crtc != crtc)
> - continue;
> -
> + drm_for_each_encoder_mask(encoder, crtc->dev,
> crtc->state->encoder_mask)
> dpu_encoder_kickoff(encoder);
> - }
We wont be holding the modeset locks here (and in crtc_atomic_begin) in
the display thread. Is
it safe to iterate over encoder_mask?
>
> end:
> reinit_completion(&dpu_crtc->frame_done_comp);
> @@ -883,11 +871,8 @@ static void dpu_crtc_disable(struct drm_crtc
> *crtc)
>
> dpu_core_perf_crtc_update(crtc, 0, true);
>
> - drm_for_each_encoder(encoder, crtc->dev) {
> - if (encoder->crtc != crtc)
> - continue;
> + drm_for_each_encoder_mask(encoder, crtc->dev,
> crtc->state->encoder_mask)
> dpu_encoder_register_frame_event_callback(encoder, NULL,
> NULL);
> - }
>
> memset(cstate->mixers, 0, sizeof(cstate->mixers));
> cstate->num_mixers = 0;
> @@ -922,12 +907,9 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
> DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);
> dpu_crtc = to_dpu_crtc(crtc);
>
> - drm_for_each_encoder(encoder, crtc->dev) {
> - if (encoder->crtc != crtc)
> - continue;
> + drm_for_each_encoder_mask(encoder, crtc->dev,
> crtc->state->encoder_mask)
> dpu_encoder_register_frame_event_callback(encoder,
> dpu_crtc_frame_event_cb, (void *)crtc);
> - }
>
> mutex_lock(&dpu_crtc->crtc_lock);
> trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index 1bec4540f3e1..64134d619748 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> @@ -320,7 +320,10 @@ static void dpu_kms_prepare_commit(struct msm_kms
> *kms,
> struct dpu_kms *dpu_kms;
> struct msm_drm_private *priv;
> struct drm_device *dev;
> + struct drm_crtc *crtc;
> + struct drm_crtc_state *crtc_state;
> struct drm_encoder *encoder;
> + int i;
>
> if (!kms)
> return;
> @@ -332,9 +335,13 @@ static void dpu_kms_prepare_commit(struct msm_kms
> *kms,
> priv = dev->dev_private;
> pm_runtime_get_sync(&dpu_kms->pdev->dev);
>
> - list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
> - if (encoder->crtc != NULL)
> + /* Call prepare_commit for all affected encoders */
> + for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
> + drm_for_each_encoder_mask(encoder, crtc->dev,
> + crtc_state->encoder_mask) {
> dpu_encoder_prepare_commit(encoder);
> + }
> + }
> }
>
> /*
> @@ -344,13 +351,17 @@ static void dpu_kms_prepare_commit(struct msm_kms
> *kms,
> void dpu_kms_encoder_enable(struct drm_encoder *encoder)
> {
> const struct drm_encoder_helper_funcs *funcs =
> encoder->helper_private;
> - struct drm_crtc *crtc = encoder->crtc;
> + struct drm_device *dev = encoder->dev;
> + struct drm_crtc *crtc;
>
> /* Forward this enable call to the commit hook */
> if (funcs && funcs->commit)
> funcs->commit(encoder);
>
> - if (crtc && crtc->state->active) {
> + drm_for_each_crtc(crtc, dev) {
> + if (!(crtc->state->encoder_mask &
> drm_encoder_mask(encoder)))
> + continue;
> +
> trace_dpu_kms_enc_enable(DRMID(crtc));
> dpu_crtc_commit_kickoff(crtc);
> }

--
Jeykumar S