linux-kernel - [PATCH v2 4/8] drm: xlnx: zynqmp_dpsub: Minimize usage of global flag

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Message-ID: <20240312-dp-live-fmt-v2-4-a9c35dc5c50d@amd.com>
Date: Tue, 12 Mar 2024 17:55:01 -0700
From: Anatoliy Klymenko <anatoliy.klymenko@....com>
To: Laurent Pinchart <laurent.pinchart@...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>,
	"Andrzej Hajda" <andrzej.hajda@...el.com>, Neil Armstrong
	<neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, Jonas Karlman
	<jonas@...boo.se>, "Jernej Skrabec" <jernej.skrabec@...il.com>, Rob Herring
	<robh+dt@...nel.org>, Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
	Mauro Carvalho Chehab <mchehab@...nel.org>
CC: <dri-devel@...ts.freedesktop.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-media@...r.kernel.org>, Anatoliy Klymenko <anatoliy.klymenko@....com>
Subject: [PATCH v2 4/8] drm: xlnx: zynqmp_dpsub: Minimize usage of global
 flag

Avoid usage of global zynqmp_dpsub.dma_enabled flag in DPSUB layer
context. This flag signals whether the driver runs in DRM CRTC or DRM
bridge mode, assuming that all display layers share the same live or
non-live mode of operation. Using per-layer mode instead of global flag
will siplify future support of the hybrid scenario.

Signed-off-by: Anatoliy Klymenko <anatoliy.klymenko@....com>
---
 drivers/gpu/drm/xlnx/zynqmp_disp.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/xlnx/zynqmp_disp.c b/drivers/gpu/drm/xlnx/zynqmp_disp.c
index af851190f447..dd48fa60fa9a 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_disp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_disp.c
@@ -975,7 +975,7 @@ void zynqmp_disp_layer_disable(struct zynqmp_disp_layer *layer)
 {
 	unsigned int i;
 
-	if (layer->disp->dpsub->dma_enabled) {
+	if (layer->mode == ZYNQMP_DPSUB_LAYER_NONLIVE) {
 		for (i = 0; i < layer->drm_fmt->num_planes; i++)
 			dmaengine_terminate_sync(layer->dmas[i].chan);
 	}
@@ -1001,7 +1001,7 @@ void zynqmp_disp_layer_set_format(struct zynqmp_disp_layer *layer,
 
 	zynqmp_disp_avbuf_set_format(layer->disp, layer, layer->disp_fmt);
 
-	if (!layer->disp->dpsub->dma_enabled)
+	if (layer->mode == ZYNQMP_DPSUB_LAYER_LIVE)
 		return;
 
 	/*
@@ -1039,7 +1039,7 @@ int zynqmp_disp_layer_update(struct zynqmp_disp_layer *layer,
 	const struct drm_format_info *info = layer->drm_fmt;
 	unsigned int i;
 
-	if (!layer->disp->dpsub->dma_enabled)
+	if (layer->mode == ZYNQMP_DPSUB_LAYER_LIVE)
 		return 0;
 
 	for (i = 0; i < info->num_planes; i++) {
@@ -1089,7 +1089,7 @@ static void zynqmp_disp_layer_release_dma(struct zynqmp_disp *disp,
 {
 	unsigned int i;
 
-	if (!layer->info || !disp->dpsub->dma_enabled)
+	if (!layer->info)
 		return;
 
 	for (i = 0; i < layer->info->num_channels; i++) {
@@ -1132,9 +1132,6 @@ static int zynqmp_disp_layer_request_dma(struct zynqmp_disp *disp,
 	unsigned int i;
 	int ret;
 
-	if (!disp->dpsub->dma_enabled)
-		return 0;
-
 	for (i = 0; i < layer->info->num_channels; i++) {
 		struct zynqmp_disp_layer_dma *dma = &layer->dmas[i];
 		char dma_channel_name[16];

-- 
2.25.1