[PATCH 3/6] imx: imx8mp: disable fused IP for UltraLite

[Peng Fan (OSS)]

From: Peng Fan <peng.fan at nxp.com>

Beside the fused modules on iMX8MP Lite, this part has also fused
GPU3D/2D, LVDS and MIPI DSI.
So we have to disable them for kernel and also disable MIPI DSI
in u-boot DTS for splash screen at runtime.

Signed-off-by: Ye Li <ye.li at nxp.com>
Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 arch/arm/mach-imx/imx8m/soc.c | 147 ++++++++++++++++++++++++++++++++--
 1 file changed, 142 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mach-imx/imx8m/soc.c b/arch/arm/mach-imx/imx8m/soc.c
index f88296f7311..0ab55765c7c 100644
--- a/arch/arm/mach-imx/imx8m/soc.c
+++ b/arch/arm/mach-imx/imx8m/soc.c
@@ -907,6 +907,90 @@ static int low_drive_gpu_freq(void *blob)
 }
 #endif
 
+static bool check_remote_endpoint(void *blob, const char *ep1, const char *ep2)
+{
+	int lookup_node;
+	int nodeoff;
+
+	nodeoff = fdt_path_offset(blob, ep1);
+	if (nodeoff) {
+		lookup_node = fdtdec_lookup_phandle(blob, nodeoff, "remote-endpoint");
+		nodeoff = fdt_path_offset(blob, ep2);
+
+		if (nodeoff > 0 && nodeoff == lookup_node)
+			return true;
+	}
+
+	return false;
+}
+
+int disable_dsi_lcdif_nodes(void *blob)
+{
+	int ret;
+
+	static const char * const dsi_path_8mp[] = {
+		"/soc at 0/bus at 32c00000/mipi_dsi at 32e60000"
+	};
+
+	static const char * const lcdif_path_8mp[] = {
+		"/soc at 0/bus at 32c00000/lcd-controller at 32e80000"
+	};
+
+	static const char * const lcdif_ep_path_8mp[] = {
+		"/soc at 0/bus at 32c00000/lcd-controller at 32e80000/port at 0/endpoint"
+	};
+	static const char * const dsi_ep_path_8mp[] = {
+		"/soc at 0/bus at 32c00000/mipi_dsi at 32e60000/port at 0/endpoint"
+	};
+
+	ret = disable_fdt_nodes(blob, dsi_path_8mp, ARRAY_SIZE(dsi_path_8mp));
+	if (ret)
+		return ret;
+
+	if (check_remote_endpoint(blob, dsi_ep_path_8mp[0], lcdif_ep_path_8mp[0])) {
+		/* Disable lcdif node */
+		return disable_fdt_nodes(blob, lcdif_path_8mp, ARRAY_SIZE(lcdif_path_8mp));
+	}
+
+	return 0;
+}
+
+int disable_lvds_lcdif_nodes(void *blob)
+{
+	int ret, i;
+
+	static const char * const ldb_path_8mp[] = {
+		"/soc at 0/bus at 32c00000/ldb at 32ec005c",
+		"/soc at 0/bus at 32c00000/phy at 32ec0128"
+	};
+
+	static const char * const lcdif_path_8mp[] = {
+		"/soc at 0/bus at 32c00000/lcd-controller at 32e90000"
+	};
+
+	static const char * const lcdif_ep_path_8mp[] = {
+		"/soc at 0/bus at 32c00000/lcd-controller at 32e90000/port at 0/endpoint at 0",
+		"/soc at 0/bus at 32c00000/lcd-controller at 32e90000/port at 0/endpoint at 1"
+	};
+	static const char * const ldb_ep_path_8mp[] = {
+		"/soc at 0/bus at 32c00000/ldb at 32ec005c/lvds-channel at 0/port at 0/endpoint",
+		"/soc at 0/bus at 32c00000/ldb at 32ec005c/lvds-channel at 1/port at 0/endpoint"
+	};
+
+	ret = disable_fdt_nodes(blob, ldb_path_8mp, ARRAY_SIZE(ldb_path_8mp));
+	if (ret)
+		return ret;
+
+	for (i = 0; i < ARRAY_SIZE(ldb_ep_path_8mp); i++) {
+		if (check_remote_endpoint(blob, ldb_ep_path_8mp[i], lcdif_ep_path_8mp[i])) {
+			/* Disable lcdif node */
+			return disable_fdt_nodes(blob, lcdif_path_8mp, ARRAY_SIZE(lcdif_path_8mp));
+		}
+	}
+
+	return 0;
+}
+
 int disable_gpu_nodes(void *blob)
 {
 	static const char * const nodes_path_8mn[] = {
@@ -914,7 +998,15 @@ int disable_gpu_nodes(void *blob)
 		"/soc@/gpu at 38000000"
 	};
 
-	return disable_fdt_nodes(blob, nodes_path_8mn, ARRAY_SIZE(nodes_path_8mn));
+	static const char * const nodes_path_8mp[] = {
+		"/gpu3d at 38000000",
+		"/gpu2d at 38008000"
+	};
+
+	if (is_imx8mp())
+		return disable_fdt_nodes(blob, nodes_path_8mp, ARRAY_SIZE(nodes_path_8mp));
+	else
+		return disable_fdt_nodes(blob, nodes_path_8mn, ARRAY_SIZE(nodes_path_8mn));
 }
 
 int disable_npu_nodes(void *blob)
@@ -1170,16 +1262,27 @@ usb_modify_speed:
 		disable_cpu_nodes(blob, 3);
 
 #elif defined(CONFIG_IMX8MP)
-	if (is_imx8mpl())
+	if (is_imx8mpul()) {
+		/* Disable GPU */
+		disable_gpu_nodes(blob);
+
+		/* Disable DSI */
+		disable_dsi_lcdif_nodes(blob);
+
+		/* Disable LVDS */
+		disable_lvds_lcdif_nodes(blob);
+	}
+
+	if (is_imx8mpul() || is_imx8mpl())
 		disable_vpu_nodes(blob);
 
-	if (is_imx8mpl() || is_imx8mp6())
+	if (is_imx8mpul() || is_imx8mpl() || is_imx8mp6())
 		disable_npu_nodes(blob);
 
-	if (is_imx8mpl())
+	if (is_imx8mpul() || is_imx8mpl())
 		disable_isp_nodes(blob);
 
-	if (is_imx8mpl() || is_imx8mp6())
+	if (is_imx8mpul() || is_imx8mpl() || is_imx8mp6())
 		disable_dsp_nodes(blob);
 
 	if (is_imx8mpd())
@@ -1190,6 +1293,40 @@ usb_modify_speed:
 }
 #endif
 
+#ifdef CONFIG_OF_BOARD_FIXUP
+#ifndef CONFIG_SPL_BUILD
+int board_fix_fdt(void *fdt)
+{
+	if (is_imx8mpul()) {
+		int i = 0;
+		int nodeoff, ret;
+		const char *status = "disabled";
+		static const char * const dsi_nodes[] = {
+			"/soc at 0/bus at 32c00000/mipi_dsi at 32e60000",
+			"/soc at 0/bus at 32c00000/lcd-controller at 32e80000",
+			"/dsi-host"
+		};
+
+		for (i = 0; i < ARRAY_SIZE(dsi_nodes); i++) {
+			nodeoff = fdt_path_offset(fdt, dsi_nodes[i]);
+			if (nodeoff > 0) {
+set_status:
+				ret = fdt_setprop(fdt, nodeoff, "status", status,
+						  strlen(status) + 1);
+				if (ret == -FDT_ERR_NOSPACE) {
+					ret = fdt_increase_size(fdt, 512);
+					if (!ret)
+						goto set_status;
+				}
+			}
+		}
+	}
+
+	return 0;
+}
+#endif
+#endif
+
 #if !CONFIG_IS_ENABLED(SYSRESET)
 void reset_cpu(void)
 {
-- 
2.35.1