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 simplify future support of the hybrid scenario.

Remove redundant checks in DMA request/release contexts as
zynqmp_disp_layer.info is well-defined for all layer types, including the
correct number of DMA channels required for each particular layer.

Signed-off-by: Anatoliy Klymenko <anatoliy.klymenko@amd.com>
Reviewed-by: Tomi Valkeinen <tomi.valkainen@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240416-dp-live-fmt-v4-5-c7f379b7168e@amd.com

drivers/gpu/drm/xlnx/zynqmp_disp.c

@@ -1026,7 +1026,7 @@ 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);
 	}
@@ -1052,7 +1052,7 @@ 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;
 
 	/*
@@ -1090,7 +1090,7 @@ 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++) {
@@ -1140,9 +1140,6 @@ static void zynqmp_disp_layer_release_dma(struct zynqmp_disp *disp,
 {
 	unsigned int i;
 
-	if (!layer->info || !disp->dpsub->dma_enabled)
-		return;
-
 	for (i = 0; i < layer->info->num_channels; i++) {
 		struct zynqmp_disp_layer_dma *dma = &layer->dmas[i];
 
@@ -1183,9 +1180,6 @@ 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];