[RFC PATCH v5 3/6] drm/tidss: Add support for AM625 DSS

[Aradhya Bhatia <a-bhatia1@ti.com>]

Add support for the DSS controller on TI's new AM625 SoC in the tidss
driver.

The first video port (VP0) in am625-dss can output OLDI signals through
2 OLDI TXes. A 3rd port has been added with "DISPC_VP_OLDI" bus type.

Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
---
 drivers/gpu/drm/tidss/tidss_dispc.c | 61 ++++++++++++++++++++++++++++-
 drivers/gpu/drm/tidss/tidss_dispc.h |  3 ++
 drivers/gpu/drm/tidss/tidss_drv.c   |  1 +
 3 files changed, 64 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c
index dd3c6a606ae2..34f0da4bb3e3 100644
--- a/drivers/gpu/drm/tidss/tidss_dispc.c
+++ b/drivers/gpu/drm/tidss/tidss_dispc.c
@@ -93,6 +93,7 @@ const struct dispc_features dispc_k2g_feats = {
 	.common_regs = tidss_k2g_common_regs,
 
 	.num_vps = 1,
+	.num_max_ports = 1,
 	.vp_name = { "vp1" },
 	.ovr_name = { "ovr1" },
 	.vpclk_name =  { "vp1" },
@@ -168,6 +169,7 @@ const struct dispc_features dispc_am65x_feats = {
 	.common_regs = tidss_am65x_common_regs,
 
 	.num_vps = 2,
+	.num_max_ports = 2,
 	.vp_name = { "vp1", "vp2" },
 	.ovr_name = { "ovr1", "ovr2" },
 	.vpclk_name =  { "vp1", "vp2" },
@@ -257,6 +259,7 @@ const struct dispc_features dispc_j721e_feats = {
 	.common_regs = tidss_j721e_common_regs,
 
 	.num_vps = 4,
+	.num_max_ports = 4,
 	.vp_name = { "vp1", "vp2", "vp3", "vp4" },
 	.ovr_name = { "ovr1", "ovr2", "ovr3", "ovr4" },
 	.vpclk_name = { "vp1", "vp2", "vp3", "vp4" },
@@ -275,6 +278,57 @@ const struct dispc_features dispc_j721e_feats = {
 	.vid_order = { 1, 3, 0, 2 },
 };
 
+const struct dispc_features dispc_am625_feats = {
+	.max_pclk_khz = {
+		[DISPC_VP_DPI] = 165000,
+		[DISPC_VP_OLDI] = 165000,
+	},
+
+	.scaling = {
+		.in_width_max_5tap_rgb = 1280,
+		.in_width_max_3tap_rgb = 2560,
+		.in_width_max_5tap_yuv = 2560,
+		.in_width_max_3tap_yuv = 4096,
+		.upscale_limit = 16,
+		.downscale_limit_5tap = 4,
+		.downscale_limit_3tap = 2,
+		/*
+		 * The max supported pixel inc value is 255. The value
+		 * of pixel inc is calculated like this: 1+(xinc-1)*bpp.
+		 * The maximum bpp of all formats supported by the HW
+		 * is 8. So the maximum supported xinc value is 32,
+		 * because 1+(32-1)*8 < 255 < 1+(33-1)*4.
+		 */
+		.xinc_max = 32,
+	},
+
+	.subrev = DISPC_AM625,
+
+	.common = "common",
+	.common_regs = tidss_am65x_common_regs,
+
+	.num_vps = 2,
+	/* note: the 3rd port is not representative of a 3rd pipeline */
+	.num_max_ports = 3,
+	.vp_name = { "vp1", "vp2" },
+	.ovr_name = { "ovr1", "ovr2" },
+	.vpclk_name =  { "vp1", "vp2" },
+	.vp_bus_type = { DISPC_VP_OLDI, DISPC_VP_DPI, DISPC_VP_OLDI },
+
+	.vp_feat = { .color = {
+			.has_ctm = true,
+			.gamma_size = 256,
+			.gamma_type = TIDSS_GAMMA_8BIT,
+		},
+	},
+
+	.num_planes = 2,
+	/* note: vid is plane_id 0 and vidl1 is plane_id 1 */
+	.vid_name = { "vid", "vidl1" },
+	.vid_lite = { false, true, },
+	.vid_order = { 1, 0 },
+};
+
 static const u16 *dispc_common_regmap;
 
 struct dss_vp_data {
@@ -778,6 +832,7 @@ dispc_irq_t dispc_read_and_clear_irqstatus(struct dispc_device *dispc)
 		return dispc_k2g_read_and_clear_irqstatus(dispc);
 	case DISPC_AM65X:
 	case DISPC_J721E:
+	case DISPC_AM625:
 		return dispc_k3_read_and_clear_irqstatus(dispc);
 	default:
 		WARN_ON(1);
@@ -793,6 +848,7 @@ void dispc_set_irqenable(struct dispc_device *dispc, dispc_irq_t mask)
 		break;
 	case DISPC_AM65X:
 	case DISPC_J721E:
+	case DISPC_AM625:
 		dispc_k3_set_irqenable(dispc, mask);
 		break;
 	default:
@@ -1282,6 +1338,7 @@ void dispc_ovr_set_plane(struct dispc_device *dispc, u32 hw_plane,
 					x, y, layer);
 		break;
 	case DISPC_AM65X:
+	case DISPC_AM625:
 		dispc_am65x_ovr_set_plane(dispc, hw_plane, hw_videoport,
 					  x, y, layer);
 		break;
@@ -2205,6 +2262,7 @@ static void dispc_plane_init(struct dispc_device *dispc)
 		break;
 	case DISPC_AM65X:
 	case DISPC_J721E:
+	case DISPC_AM625:
 		dispc_k3_plane_init(dispc);
 		break;
 	default:
@@ -2310,6 +2368,7 @@ static void dispc_vp_write_gamma_table(struct dispc_device *dispc,
 		dispc_k2g_vp_write_gamma_table(dispc, hw_videoport);
 		break;
 	case DISPC_AM65X:
+	case DISPC_AM625:
 		dispc_am65x_vp_write_gamma_table(dispc, hw_videoport);
 		break;
 	case DISPC_J721E:
@@ -2583,7 +2642,7 @@ int dispc_runtime_resume(struct dispc_device *dispc)
 		REG_GET(dispc, DSS_SYSSTATUS, 2, 2),
 		REG_GET(dispc, DSS_SYSSTATUS, 3, 3));
 
-	if (dispc->feat->subrev == DISPC_AM65X)
+	if (dispc->feat->subrev == DISPC_AM65X || dispc->feat->subrev == DISPC_AM625)
 		dev_dbg(dispc->dev, "OLDI RESETDONE %d,%d,%d\n",
 			REG_GET(dispc, DSS_SYSSTATUS, 5, 5),
 			REG_GET(dispc, DSS_SYSSTATUS, 6, 6),
diff --git a/drivers/gpu/drm/tidss/tidss_dispc.h b/drivers/gpu/drm/tidss/tidss_dispc.h
index e49432f0abf5..b66418e583ee 100644
--- a/drivers/gpu/drm/tidss/tidss_dispc.h
+++ b/drivers/gpu/drm/tidss/tidss_dispc.h
@@ -61,6 +61,7 @@ enum dispc_dss_subrevision {
 	DISPC_K2G,
 	DISPC_AM65X,
 	DISPC_J721E,
+	DISPC_AM625,
 };
 
 struct dispc_features {
@@ -74,6 +75,7 @@ struct dispc_features {
 	const char *common;
 	const u16 *common_regs;
 	u32 num_vps;
+	u32 num_max_ports;
 	const char *vp_name[TIDSS_MAX_PORTS]; /* Should match dt reg names */
 	const char *ovr_name[TIDSS_MAX_PORTS]; /* Should match dt reg names */
 	const char *vpclk_name[TIDSS_MAX_PORTS]; /* Should match dt clk names */
@@ -88,6 +90,7 @@ struct dispc_features {
 extern const struct dispc_features dispc_k2g_feats;
 extern const struct dispc_features dispc_am65x_feats;
 extern const struct dispc_features dispc_j721e_feats;
+extern const struct dispc_features dispc_am625_feats;
 
 void dispc_set_irqenable(struct dispc_device *dispc, dispc_irq_t mask);
 dispc_irq_t dispc_read_and_clear_irqstatus(struct dispc_device *dispc);
diff --git a/drivers/gpu/drm/tidss/tidss_drv.c b/drivers/gpu/drm/tidss/tidss_drv.c
index 04cfff89ee51..326059e99696 100644
--- a/drivers/gpu/drm/tidss/tidss_drv.c
+++ b/drivers/gpu/drm/tidss/tidss_drv.c
@@ -235,6 +235,7 @@ static const struct of_device_id tidss_of_table[] = {
 	{ .compatible = "ti,k2g-dss", .data = &dispc_k2g_feats, },
 	{ .compatible = "ti,am65x-dss", .data = &dispc_am65x_feats, },
 	{ .compatible = "ti,j721e-dss", .data = &dispc_j721e_feats, },
+	{ .compatible = "ti,am625-dss", .data = &dispc_am625_feats, },
 	{ }
 };
 
-- 
2.37.0