linux-kernel - [PATCH] drm: xlnx: zynqmp_dpsub: Enable plane in atomic update

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Message-ID: <20240520-dp-layer-enable-v1-1-c9b481209115@amd.com>
Date: Mon, 20 May 2024 20:22:31 -0700
From: Anatoliy Klymenko <anatoliy.klymenko@....com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, Tomi Valkeinen
	<tomi.valkeinen@...asonboard.com>, Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>, Michal Simek <michal.simek@....com>
CC: <dri-devel@...ts.freedesktop.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Anatoliy Klymenko <anatoliy.klymenko@....com>
Subject: [PATCH] drm: xlnx: zynqmp_dpsub: Enable plane in atomic update

Unconditionally enable the DPSUB layer in the corresponding atomic plane
update callback. Setting the new display mode may require disabling and
re-enabling the CRTC. This effectively resets DPSUB to the default state
with all layers disabled. The original implementation of the plane atomic
update enables the corresponding DPSUB layer only if the framebuffer
format has changed. This would leave the layer disabled after switching to
a different display mode with the same framebuffer format.

Signed-off-by: Anatoliy Klymenko <anatoliy.klymenko@....com>
---
 drivers/gpu/drm/xlnx/zynqmp_kms.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/xlnx/zynqmp_kms.c b/drivers/gpu/drm/xlnx/zynqmp_kms.c
index 43bf416b33d5..c4f038e34814 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_kms.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_kms.c
@@ -120,9 +120,8 @@ static void zynqmp_dpsub_plane_atomic_update(struct drm_plane *plane,
 		zynqmp_disp_blend_set_global_alpha(dpsub->disp, true,
 						   plane->state->alpha >> 8);
 
-	/* Enable or re-enable the plane if the format has changed. */
-	if (format_changed)
-		zynqmp_disp_layer_enable(layer);
+	/* Enable or re-enable the plane. */
+	zynqmp_disp_layer_enable(layer);
 }
 
 static const struct drm_plane_helper_funcs zynqmp_dpsub_plane_helper_funcs = {

---
base-commit: 673087d8b023faf34b84e8faf63bbeea3da87bab
change-id: 20240520-dp-layer-enable-7b561af29ca8

Best regards,
-- 
Anatoliy Klymenko <anatoliy.klymenko@....com>