linux-kernel - [PATCH v3 047/105] drm/vc4: crtc: Remove mode_set

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Date:   Wed, 27 May 2020 17:48:17 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>,
        Maxime Ripard <maxime@...no.tech>
Subject: [PATCH v3 047/105] drm/vc4: crtc: Remove mode_set_nofb

On BCM2711 to avoid stale pixels getting stuck in intermediate FIFOs, the
pixelvalve needs to be setup each time there's a mode change or enable /
disable sequence.

Therefore, we can't really use mode_set_nofb anymore to configure it, but
we need to move it to atomic_enable.

Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/vc4/vc4_crtc.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index a69e0d456b79..08bd595f6a7c 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -374,14 +374,6 @@ static void vc4_crtc_config_pv(struct drm_crtc *crtc)
 	}
 }
 
-static void vc4_crtc_mode_set_nofb(struct drm_crtc *crtc)
-{
-	struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
-
-	if (!vc4_state->feed_txp)
-		vc4_crtc_config_pv(crtc);
-}
-
 static void require_hvs_enabled(struct drm_device *dev)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
@@ -443,6 +435,9 @@ static void vc4_crtc_atomic_enable(struct drm_crtc *crtc,
 
 	vc4_crtc_pixelvalve_reset(crtc);
 
+	if (!vc4_state->feed_txp)
+		vc4_crtc_config_pv(crtc);
+
 	CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) | PV_CONTROL_EN);
 
 	/* Enable vblank irq handling before crtc is started otherwise
@@ -814,7 +809,6 @@ static const struct drm_crtc_funcs vc4_crtc_funcs = {
 };
 
 static const struct drm_crtc_helper_funcs vc4_crtc_helper_funcs = {
-	.mode_set_nofb = vc4_crtc_mode_set_nofb,
 	.mode_valid = vc4_crtc_mode_valid,
 	.atomic_check = vc4_crtc_atomic_check,
 	.atomic_flush = vc4_hvs_atomic_flush,
-- 
git-series 0.9.1