Subject: [PATCH v2 2/4] drm/verisilicon: add model ID constants and DCU Lite chip identity

From: Joey Lu <[email-masked]>
Date: Tue, 19 May 2026 13:51:07 +0800

Introduce symbolic constants VSDC_MODEL_DC8200 and VSDC_MODEL_DCU_LITE
to replace magic numbers in the hardware database and probe path.

Register the DCU Lite chip identity (model 0x0, revision 0x5560,
customer_id 0x305) in vs_chip_identities[], making the existing
vs_fill_chip_identity() path able to recognise Nuvoton MA35D1 hardware
purely through register reads.

Also add three register-level macros for forthcoming DCU Lite support:
- VSDC_DISP_IRQ_VSYNC(n) in vs_crtc_regs.h, for per-output VSYNC IRQ
  bits used by the DCU Lite IRQ enable/status registers.
- VSDC_FB_CONFIG_ENABLE, VSDC_FB_CONFIG_VALID and VSDC_FB_CONFIG_RESET
  in vs_primary_plane_regs.h, for the framebuffer enable and
  commit-cycle bits used by the DCU Lite plane update path.

No behaviour change for existing DC8200 platforms.

Signed-off-by: Joey Lu <[email-masked]>
---
 drivers/gpu/drm/verisilicon/vs_crtc_regs.h       |  1 +
 drivers/gpu/drm/verisilicon/vs_hwdb.c            | 16 ++++++++++++----
 drivers/gpu/drm/verisilicon/vs_hwdb.h            |  3 +++
 .../gpu/drm/verisilicon/vs_primary_plane_regs.h  |  3 +++
 4 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/verisilicon/vs_crtc_regs.h b/drivers/gpu/drm/verisilicon/vs_crtc_regs.h
index c7930e817635..d4da22b08cd5 100644
--- a/drivers/gpu/drm/verisilicon/vs_crtc_regs.h
+++ b/drivers/gpu/drm/verisilicon/vs_crtc_regs.h
@@ -54,6 +54,7 @@
 #define VSDC_DISP_GAMMA_DATA(n)			(0x1460 + 0x4 * (n))
 
 #define VSDC_DISP_IRQ_STA			0x147C
+#define VSDC_DISP_IRQ_VSYNC(n)			BIT(n)
 
 #define VSDC_DISP_IRQ_EN			0x1480
 
diff --git a/drivers/gpu/drm/verisilicon/vs_hwdb.c b/drivers/gpu/drm/verisilicon/vs_hwdb.c
index 09336af0900a..a25c4b16181d 100644
--- a/drivers/gpu/drm/verisilicon/vs_hwdb.c
+++ b/drivers/gpu/drm/verisilicon/vs_hwdb.c
@@ -90,7 +90,7 @@ static const struct vs_formats vs_formats_with_yuv444 = {
 
 static struct vs_chip_identity vs_chip_identities[] = {
 	{
-		.model = 0x8200,
+		.model = VSDC_MODEL_DC8200,
 		.revision = 0x5720,
 		.customer_id = ~0U,
 
@@ -98,7 +98,7 @@ static struct vs_chip_identity vs_chip_identities[] = {
 		.formats = &vs_formats_no_yuv444,
 	},
 	{
-		.model = 0x8200,
+		.model = VSDC_MODEL_DC8200,
 		.revision = 0x5721,
 		.customer_id = 0x30B,
 
@@ -106,7 +106,7 @@ static struct vs_chip_identity vs_chip_identities[] = {
 		.formats = &vs_formats_no_yuv444,
 	},
 	{
-		.model = 0x8200,
+		.model = VSDC_MODEL_DC8200,
 		.revision = 0x5720,
 		.customer_id = 0x310,
 
@@ -114,13 +114,21 @@ static struct vs_chip_identity vs_chip_identities[] = {
 		.formats = &vs_formats_with_yuv444,
 	},
 	{
-		.model = 0x8200,
+		.model = VSDC_MODEL_DC8200,
 		.revision = 0x5720,
 		.customer_id = 0x311,
 
 		.display_count = 2,
 		.formats = &vs_formats_no_yuv444,
 	},
+	{
+		.model = VSDC_MODEL_DCU_LITE,
+		.revision = 0x5560,
+		.customer_id = 0x305,
+
+		.display_count = 1,
+		.formats = &vs_formats_no_yuv444,
+	},
 };
 
 int vs_fill_chip_identity(struct regmap *regs,
diff --git a/drivers/gpu/drm/verisilicon/vs_hwdb.h b/drivers/gpu/drm/verisilicon/vs_hwdb.h
index 92192e4fa086..cca126bd2da5 100644
--- a/drivers/gpu/drm/verisilicon/vs_hwdb.h
+++ b/drivers/gpu/drm/verisilicon/vs_hwdb.h
@@ -9,6 +9,9 @@
 #include <linux/regmap.h>
 #include <linux/types.h>
 
+#define VSDC_MODEL_DC8200 0x8200
+#define VSDC_MODEL_DCU_LITE 0x0
+
 struct vs_formats {
 	const u32 *array;
 	unsigned int num;
diff --git a/drivers/gpu/drm/verisilicon/vs_primary_plane_regs.h b/drivers/gpu/drm/verisilicon/vs_primary_plane_regs.h
index cbb125c46b39..67d4b00f294e 100644
--- a/drivers/gpu/drm/verisilicon/vs_primary_plane_regs.h
+++ b/drivers/gpu/drm/verisilicon/vs_primary_plane_regs.h
@@ -16,6 +16,9 @@
 #define VSDC_FB_STRIDE(n)			(0x1408 + 0x4 * (n))
 
 #define VSDC_FB_CONFIG(n)			(0x1518 + 0x4 * (n))
+#define VSDC_FB_CONFIG_ENABLE			BIT(0)
+#define VSDC_FB_CONFIG_VALID			BIT(3)
+#define VSDC_FB_CONFIG_RESET			BIT(4)
 #define VSDC_FB_CONFIG_CLEAR_EN			BIT(8)
 #define VSDC_FB_CONFIG_ROT_MASK			GENMASK(13, 11)
 #define VSDC_FB_CONFIG_ROT(v)			((v) << 11)
-- 
2.43.0