openwrt/target/linux/bcm27xx/patches-5.15/950-0620-drm-vc4-hvs-Move-the-dlist-setup-to-its-own-function.patch

From 849b51e0dea1746f17b8b0b59c5e6cc831e23697 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Mon, 6 Dec 2021 16:31:33 +0100
Subject: [PATCH] drm/vc4: hvs: Move the dlist setup to its own
 function

The vc4_hvs_update_dlist function mostly deals with setting up the
vblank events and setting up the dlist entry pointer to our current
active one.

We'll want to do the former separately from the vblank handling in later
patches, so let's move it to a function of its own.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_hvs.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -596,10 +596,19 @@ int vc4_hvs_atomic_check(struct drm_crtc
 	return vc4_hvs_gamma_check(crtc, state);
 }
 
-static void vc4_hvs_update_dlist(struct drm_crtc *crtc)
+static void vc4_hvs_install_dlist(struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
+
+	HVS_WRITE(SCALER_DISPLISTX(vc4_state->assigned_channel),
+		  vc4_state->mm.start);
+}
+
+static void vc4_hvs_update_dlist(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
 	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 	struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
 	unsigned long flags;
@@ -619,9 +628,6 @@ static void vc4_hvs_update_dlist(struct
 		spin_unlock_irqrestore(&dev->event_lock, flags);
 	}
 
-	HVS_WRITE(SCALER_DISPLISTX(vc4_state->assigned_channel),
-		  vc4_state->mm.start);
-
 	spin_lock_irqsave(&vc4_crtc->irq_lock, flags);
 	vc4_crtc->current_dlist = vc4_state->mm.start;
 	spin_unlock_irqrestore(&vc4_crtc->irq_lock, flags);
@@ -648,6 +654,7 @@ void vc4_hvs_atomic_enable(struct drm_cr
 	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 	bool oneshot = vc4_crtc->feeds_txp;
 
+	vc4_hvs_install_dlist(crtc);
 	vc4_hvs_update_dlist(crtc);
 	vc4_hvs_init_channel(vc4, crtc, mode, oneshot);
 }
@@ -723,8 +730,10 @@ void vc4_hvs_atomic_flush(struct drm_crt
 	 * If the CRTC is being disabled, there's no point in updating this
 	 * information.
 	 */
-	if (crtc->state->active && old_state->active)
+	if (crtc->state->active && old_state->active) {
+		vc4_hvs_install_dlist(crtc);
 		vc4_hvs_update_dlist(crtc);
+	}
 
 	if (crtc->state->color_mgmt_changed) {
 		u32 dispbkgndx = HVS_READ(SCALER_DISPBKGNDX(channel));