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drm/i915: Introduce struct intel_vblank_evade_ctx

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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.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231213102519.13500-4-ville.syrjala@linux.intel.com
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
This commit is contained in:
Ville Syrjälä 2023-12-13 12:25:13 +02:00
parent bb83f348ea
commit 637bda52bf
1 changed files with 22 additions and 18 deletions
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40
drivers/gpu/drm/i915/display/intel_crtc.c
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@ -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);