> -----Original Message-----
> From: Intel-gfx <intel-gfx-boun...@lists.freedesktop.org> On Behalf Of Ville
> Syrjala
> Sent: Wednesday, December 13, 2023 3:55 PM
> To: intel-gfx@lists.freedesktop.org
> Subject: [PATCH 3/9] drm/i915: Introduce struct intel_vblank_evade_ctx
>
> From: Ville Syrjälä <ville.syrj...@linux.intel.com>
>
> Collect the information needed for vblank evasions into a structure that we
> can
> pass around more easily.
>
> And let's rename intel_crtc_vblank_evade_scanlines() to just
> intel_vblank_evade_init() so that better describes the intended usage of
> initializing the context.
Looks Good to me.
Reviewed-by: Uma Shankar <uma.shan...@intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_crtc.c | 40 +++++++++++++----------
> 1 file changed, 22 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_crtc.c
> b/drivers/gpu/drm/i915/display/intel_crtc.c
> index 4df8927bb062..93474fc9e502 100644
> --- a/drivers/gpu/drm/i915/display/intel_crtc.c
> +++ b/drivers/gpu/drm/i915/display/intel_crtc.c
> @@ -471,9 +471,13 @@ static int intel_mode_vblank_start(const struct
> drm_display_mode *mode)
> return vblank_start;
> }
>
> -static void intel_crtc_vblank_evade_scanlines(const struct intel_crtc_state
> *old_crtc_state,
> - const struct intel_crtc_state
> *new_crtc_state,
> - int *min, int *max, int
> *vblank_start)
> +struct intel_vblank_evade_ctx {
> + int min, max, vblank_start;
> +};
> +
> +static void intel_vblank_evade_init(const struct intel_crtc_state
> *old_crtc_state,
> + const struct intel_crtc_state
> *new_crtc_state,
> + struct intel_vblank_evade_ctx *evade)
> {
> struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
> const struct intel_crtc_state *crtc_state; @@ -498,17 +502,17 @@
> static void intel_crtc_vblank_evade_scanlines(const struct intel_crtc_state
> *old
> new_crtc_state->update_m_n || new_crtc_state-
> >update_lrr);
>
> if (intel_vrr_is_push_sent(crtc_state))
> - *vblank_start = intel_vrr_vmin_vblank_start(crtc_state);
> + evade->vblank_start =
> intel_vrr_vmin_vblank_start(crtc_state);
> else
> - *vblank_start =
> intel_vrr_vmax_vblank_start(crtc_state);
> + evade->vblank_start =
> intel_vrr_vmax_vblank_start(crtc_state);
> } else {
> - *vblank_start = intel_mode_vblank_start(adjusted_mode);
> + evade->vblank_start =
> intel_mode_vblank_start(adjusted_mode);
> }
>
> /* FIXME needs to be calibrated sensibly */
> - *min = *vblank_start - intel_usecs_to_scanlines(adjusted_mode,
> -
> VBLANK_EVASION_TIME_US);
> - *max = *vblank_start - 1;
> + evade->min = evade->vblank_start -
> intel_usecs_to_scanlines(adjusted_mode,
> +
> VBLANK_EVASION_TIME_US);
> + evade->max = evade->vblank_start - 1;
>
> /*
> * M/N and TRANS_VTOTAL are double buffered on the transcoder's @@
> -519,7 +523,7 @@ static void intel_crtc_vblank_evade_scanlines(const struct
> intel_crtc_state *old
> * hence we must kick off the commit before that.
> */
> if (new_crtc_state->dsb || new_crtc_state->update_m_n ||
> new_crtc_state->update_lrr)
> - *min -= adjusted_mode->crtc_vblank_start - adjusted_mode-
> >crtc_vdisplay;
> + evade->min -= adjusted_mode->crtc_vblank_start -
> +adjusted_mode->crtc_vdisplay;
> }
>
> /**
> @@ -544,10 +548,11 @@ void intel_pipe_update_start(struct intel_atomic_state
> *state,
> struct intel_crtc_state *new_crtc_state =
> intel_atomic_get_new_crtc_state(state, crtc);
> long timeout = msecs_to_jiffies_timeout(1);
> - int scanline, min, max, vblank_start;
> + int scanline;
> wait_queue_head_t *wq = drm_crtc_vblank_waitqueue(&crtc->base);
> bool need_vlv_dsi_wa = (IS_VALLEYVIEW(dev_priv) ||
> IS_CHERRYVIEW(dev_priv)) &&
> intel_crtc_has_type(new_crtc_state, INTEL_OUTPUT_DSI);
> + struct intel_vblank_evade_ctx evade;
> DEFINE_WAIT(wait);
>
> intel_psr_lock(new_crtc_state);
> @@ -565,9 +570,8 @@ void intel_pipe_update_start(struct intel_atomic_state
> *state,
> if (intel_crtc_needs_vblank_work(new_crtc_state))
> intel_crtc_vblank_work_init(new_crtc_state);
>
> - intel_crtc_vblank_evade_scanlines(old_crtc_state, new_crtc_state,
> - &min, &max, &vblank_start);
> - if (min <= 0 || max <= 0)
> + intel_vblank_evade_init(old_crtc_state, new_crtc_state, &evade);
> + if (evade.min <= 0 || evade.max <= 0)
> goto irq_disable;
>
> if (drm_WARN_ON(&dev_priv->drm, drm_crtc_vblank_get(&crtc-
> >base)))
> @@ -582,8 +586,8 @@ void intel_pipe_update_start(struct intel_atomic_state
> *state,
>
> local_irq_disable();
>
> - crtc->debug.min_vbl = min;
> - crtc->debug.max_vbl = max;
> + crtc->debug.min_vbl = evade.min;
> + crtc->debug.max_vbl = evade.max;
> trace_intel_pipe_update_start(crtc);
>
> for (;;) {
> @@ -595,7 +599,7 @@ void intel_pipe_update_start(struct intel_atomic_state
> *state,
> prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE);
>
> scanline = intel_get_crtc_scanline(crtc);
> - if (scanline < min || scanline > max)
> + if (scanline < evade.min || scanline > evade.max)
> break;
>
> if (!timeout) {
> @@ -629,7 +633,7 @@ void intel_pipe_update_start(struct intel_atomic_state
> *state,
> *
> * FIXME figure out if BXT+ DSI suffers from this as well
> */
> - while (need_vlv_dsi_wa && scanline == vblank_start)
> + while (need_vlv_dsi_wa && scanline == evade.vblank_start)
> scanline = intel_get_crtc_scanline(crtc);
>
> drm_crtc_vblank_put(&crtc->base);
> --
> 2.41.0
