linux-kernel - [PATCH 09/14] drm/imx: dc-ed: Support getting source selection

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Message-Id: <20250704-imx8-dc-prefetch-v1-9-784c03fd645f@nxp.com>
Date: Fri, 04 Jul 2025 17:03:56 +0800
From: Liu Ying <victor.liu@....com>
To: Philipp Zabel <p.zabel@...gutronix.de>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Dmitry Baryshkov <lumag@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org
Subject: [PATCH 09/14] drm/imx: dc-ed: Support getting source selection

Add a helper to get ExtDst source selection.  This is needed by
disabling CRTC at boot in an upcoming commit which tries to get
the source selection.

Signed-off-by: Liu Ying <victor.liu@....com>
---
 drivers/gpu/drm/imx/dc/dc-ed.c | 26 ++++++++++++++++++++++++++
 drivers/gpu/drm/imx/dc/dc-pe.h |  1 +
 2 files changed, 27 insertions(+)

diff --git a/drivers/gpu/drm/imx/dc/dc-ed.c b/drivers/gpu/drm/imx/dc/dc-ed.c
index 86ecc22d0a554bf3eced218df0312b513e10e179..b514790bb765329295553f89d16ee1167ef411dd 100644
--- a/drivers/gpu/drm/imx/dc/dc-ed.c
+++ b/drivers/gpu/drm/imx/dc/dc-ed.c
@@ -150,6 +150,32 @@ void dc_ed_pec_src_sel(struct dc_ed *ed, enum dc_link_id src)
 	}
 }
 
+int dc_ed_pec_src_sel_get(struct dc_ed *ed, enum dc_link_id *src)
+{
+	u32 val;
+
+	regmap_read(ed->reg_pec, PIXENGCFG_DYNAMIC, &val);
+
+	switch (val) {
+	case LINK_ID_NONE:
+	case LINK_ID_CONSTFRAME0:
+	case LINK_ID_CONSTFRAME4:
+	case LINK_ID_CONSTFRAME1:
+	case LINK_ID_CONSTFRAME5:
+	case LINK_ID_FETCHWARP2:
+	case LINK_ID_FETCHLAYER0:
+	case LINK_ID_LAYERBLEND0:
+	case LINK_ID_LAYERBLEND1:
+	case LINK_ID_LAYERBLEND2:
+	case LINK_ID_LAYERBLEND3:
+		*src = val;
+		dev_dbg(ed->dev, "get source selection: 0x%02x\n", val);
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
 void dc_ed_pec_sync_trigger(struct dc_ed *ed)
 {
 	regmap_write(ed->reg_pec, PIXENGCFG_TRIGGER, SYNC_TRIGGER);
diff --git a/drivers/gpu/drm/imx/dc/dc-pe.h b/drivers/gpu/drm/imx/dc/dc-pe.h
index f5e01a6eb9e918516adfc89949665fdd2ff1e40e..0b81dc6b251c452e7ca72f1cd12af065bafaa198 100644
--- a/drivers/gpu/drm/imx/dc/dc-pe.h
+++ b/drivers/gpu/drm/imx/dc/dc-pe.h
@@ -85,6 +85,7 @@ void dc_cf_init(struct dc_cf *cf);
 
 /* External Destination Unit */
 void dc_ed_pec_src_sel(struct dc_ed *ed, enum dc_link_id src);
+int dc_ed_pec_src_sel_get(struct dc_ed *ed, enum dc_link_id *src);
 void dc_ed_pec_sync_trigger(struct dc_ed *ed);
 void dc_ed_init(struct dc_ed *ed);
 

-- 
2.34.1