[PATCH 6.6 010/158] drm/i915: Extract intel_crtc_vblank_evade_scanlines()

Greg Kroah-Hartman
2024-04-23T21:42:43Z

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

[ Upstream commit f4b0cece716c95e16d973a774d5a5c5cc8cb335d ]

Pull the vblank evasion scanline calculations into their own helper
to declutter intel_pipe_update_start() a bit.

Reviewed-by: Manasi Navare <navaremanasi@chromium.org>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230901130440.2085-4-ville.syrjala@linux.intel.com
Reviewed-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Stable-dep-of: 4a36e46df7aa ("drm/i915: Disable live M/N updates when using bigjoiner")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/i915/display/intel_crtc.c | 53 +++++++++++++----------
1 file changed, 31 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_crtc.c b/drivers/gpu/drm/i915/display/intel_crtc.c
index 65d91c7ad22ff..9693747a18c66 100644
--- a/drivers/gpu/drm/i915/display/intel_crtc.c
+++ b/drivers/gpu/drm/i915/display/intel_crtc.c
@@ -468,6 +468,36 @@ static int intel_mode_vblank_start(const struct drm_display_mode *mode)
return vblank_start;
}

+static void intel_crtc_vblank_evade_scanlines(struct intel_atomic_state *state,
+ struct intel_crtc *crtc,
+ int *min, int *max, int *vblank_start)
+{
+ const struct intel_crtc_state *new_crtc_state =
+ intel_atomic_get_new_crtc_state(state, crtc);
+ const struct drm_display_mode *adjusted_mode = &new_crtc_state->hw.adjusted_mode;
+
+ if (new_crtc_state->vrr.enable) {
+ if (intel_vrr_is_push_sent(new_crtc_state))
+ *vblank_start = intel_vrr_vmin_vblank_start(new_crtc_state);
+ else
+ *vblank_start = intel_vrr_vmax_vblank_start(new_crtc_state);
+ } else {
+ *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;
+
+ /*
+ * M/N is double buffered on the transcoder's undelayed vblank,
+ * so with seamless M/N we must evade both vblanks.
+ */
+ if (new_crtc_state->seamless_m_n && intel_crtc_needs_fastset(new_crtc_state))
+ *min -= adjusted_mode->crtc_vblank_start - adjusted_mode->crtc_vdisplay;
+}
+
/**
* intel_pipe_update_start() - start update of a set of display registers
* @state: the atomic state
@@ -487,7 +517,6 @@ void intel_pipe_update_start(struct intel_atomic_state *state,
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
struct intel_crtc_state *new_crtc_state =
intel_atomic_get_new_crtc_state(state, crtc);
- const struct drm_display_mode *adjusted_mode = &new_crtc_state->hw.adjusted_mode;
long timeout = msecs_to_jiffies_timeout(1);
int scanline, min, max, vblank_start;
wait_queue_head_t *wq = drm_crtc_vblank_waitqueue(&crtc->base);
@@ -503,27 +532,7 @@ 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);

- if (new_crtc_state->vrr.enable) {
- if (intel_vrr_is_push_sent(new_crtc_state))
- vblank_start = intel_vrr_vmin_vblank_start(new_crtc_state);
- else
- vblank_start = intel_vrr_vmax_vblank_start(new_crtc_state);
- } else {
- 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;
-
- /*
- * M/N is double buffered on the transcoder's undelayed vblank,
- * so with seamless M/N we must evade both vblanks.
- */
- if (new_crtc_state->seamless_m_n && intel_crtc_needs_fastset(new_crtc_state))
- min -= adjusted_mode->crtc_vblank_start - adjusted_mode->crtc_vdisplay;
-
+ intel_crtc_vblank_evade_scanlines(state, crtc, &min, &max, &vblank_start);
if (min <= 0 || max <= 0)
goto irq_disable;

--
2.43.0