[PATCH 1/3] board: rockchip: Refactor panel auto-detect code

[Chris Morgan <macroalpha82@gmail.com>]

From: Chris Morgan <macromorgan@hotmail.com>

Make the inability to detect a panel using the auto detection code not
fail the entire boot process. This means that if the panel ID cannot
be read we don't set an environment variable for the panel, and if an
environment variable for the panel is not set we don't attempt to
update the compatible string. Changes to the code also ensure that
when there are multiple compatible strings required for the panel
we use them both, which solves some issues that will pop up soon
for the Linux driver.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
---
 board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c | 115 +++++++++++++--------
 1 file changed, 74 insertions(+), 41 deletions(-)

diff --git a/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c b/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c
index 3f1a42d184..3d0c614623 100644
--- a/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c
+++ b/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c
@@ -40,6 +40,7 @@ struct rg3xx_model {
 	const char *board;
 	const char *board_name;
 	const char *fdtfile;
+	const bool detect_panel;
 };
 
 enum rgxx3_device_id {
@@ -54,52 +55,67 @@ enum rgxx3_device_id {
 
 static const struct rg3xx_model rg3xx_model_details[] = {
 	[RG353M] = {
-		517, /* Observed average from device */
-		"rk3566-anbernic-rg353m",
-		"RG353M",
-		DTB_DIR "rk3566-anbernic-rg353p.dtb", /* Identical devices */
+		.adc_value = 517, /* Observed average from device */
+		.board = "rk3566-anbernic-rg353m",
+		.board_name = "RG353M",
+		/* Device is identical to RG353P. */
+		.fdtfile = DTB_DIR "rk3566-anbernic-rg353p.dtb",
+		.detect_panel = 1,
 	},
 	[RG353P] = {
-		860, /* Documented value of 860 */
-		"rk3566-anbernic-rg353p",
-		"RG353P",
-		DTB_DIR "rk3566-anbernic-rg353p.dtb",
+		.adc_value = 860, /* Documented value of 860 */
+		.board = "rk3566-anbernic-rg353p",
+		.board_name = "RG353P",
+		.fdtfile = DTB_DIR "rk3566-anbernic-rg353p.dtb",
+		.detect_panel = 1,
 	},
 	[RG353V] = {
-		695, /* Observed average from device */
-		"rk3566-anbernic-rg353v",
-		"RG353V",
-		DTB_DIR "rk3566-anbernic-rg353v.dtb",
+		.adc_value = 695, /* Observed average from device */
+		.board = "rk3566-anbernic-rg353v",
+		.board_name = "RG353V",
+		.fdtfile = DTB_DIR "rk3566-anbernic-rg353v.dtb",
+		.detect_panel = 1,
 	},
 	[RG503] = {
-		1023, /* Observed average from device */
-		"rk3566-anbernic-rg503",
-		"RG503",
-		DTB_DIR "rk3566-anbernic-rg503.dtb",
+		.adc_value = 1023, /* Observed average from device */
+		.board = "rk3566-anbernic-rg503",
+		.board_name = "RG503",
+		.fdtfile = DTB_DIR "rk3566-anbernic-rg503.dtb",
+		.detect_panel = 0,
 	},
 	/* Devices with duplicate ADC value */
 	[RG353PS] = {
-		860, /* Observed average from device */
-		"rk3566-anbernic-rg353ps",
-		"RG353PS",
-		DTB_DIR "rk3566-anbernic-rg353ps.dtb",
+		.adc_value = 860, /* Observed average from device */
+		.board = "rk3566-anbernic-rg353ps",
+		.board_name = "RG353PS",
+		.fdtfile = DTB_DIR "rk3566-anbernic-rg353ps.dtb",
+		.detect_panel = 1,
 	},
 	[RG353VS] = {
-		695, /* Gathered from second hand information */
-		"rk3566-anbernic-rg353vs",
-		"RG353VS",
-		DTB_DIR "rk3566-anbernic-rg353vs.dtb",
+		.adc_value = 695, /* Gathered from second hand information */
+		.board = "rk3566-anbernic-rg353vs",
+		.board_name = "RG353VS",
+		.fdtfile = DTB_DIR "rk3566-anbernic-rg353vs.dtb",
+		.detect_panel = 1,
 	},
 };
 
 struct rg353_panel {
 	const u16 id;
-	const char *panel_compat;
+	const char *panel_compat[2];
 };
 
 static const struct rg353_panel rg353_panel_details[] = {
-	{ .id = 0x3052, .panel_compat = "newvision,nv3051d"},
-	{ .id = 0x3821, .panel_compat = "anbernic,rg353v-panel-v2"},
+	{
+		.id = 0x3052,
+		.panel_compat[0] = "anbernic,rg353p-panel",
+		.panel_compat[1] = "newvision,nv3051d",
+	},
+	{
+		.id = 0x3821,
+		.panel_compat[0] = "anbernic,rg353v-panel-v2",
+		.panel_compat[1] = NULL,
+	},
 };
 
 /*
@@ -298,11 +314,10 @@ int rgxx3_detect_display(void)
 	if (!panel) {
 		printf("Unable to identify panel_id %x\n",
 		       (panel_id[0] << 8) | panel_id[1]);
-		env_set("panel", "unknown");
 		return -EINVAL;
 	}
 
-	env_set("panel", panel->panel_compat);
+	env_set("panel", panel->panel_compat[0]);
 
 	return 0;
 }
@@ -367,13 +382,14 @@ int rgxx3_detect_device(void)
 		rg3xx_model_details[board_id].board_name);
 	env_set("fdtfile", rg3xx_model_details[board_id].fdtfile);
 
-	/* Detect the panel type for any device that isn't a 503. */
-	if (board_id == RG503)
+	/* Skip panel detection for when it is not needed. */
+	if (!rg3xx_model_details[board_id].detect_panel)
 		return 0;
 
+	/* Warn but don't fail for errors in auto-detection of the panel. */
 	ret = rgxx3_detect_display();
 	if (ret)
-		return ret;
+		printf("Failed to detect panel type\n");
 
 	return 0;
 }
@@ -400,7 +416,8 @@ int rk_board_late_init(void)
 
 int ft_board_setup(void *blob, struct bd_info *bd)
 {
-	int node, ret;
+	const struct rg353_panel *panel = NULL;
+	int node, ret, i;
 	char *env;
 
 	/* No fixups necessary for the RG503 */
@@ -414,6 +431,12 @@ int ft_board_setup(void *blob, struct bd_info *bd)
 			    rg3xx_model_details[RG353M].board_name,
 			    sizeof(rg3xx_model_details[RG353M].board_name));
 
+	env = env_get("panel");
+	if (!env) {
+		printf("Can't get panel env\n");
+		return 0;
+	}
+
 	/*
 	 * Check if the environment variable doesn't equal the panel.
 	 * If it doesn't, update the devicetree to the correct panel.
@@ -424,12 +447,6 @@ int ft_board_setup(void *blob, struct bd_info *bd)
 		return -ENODEV;
 	}
 
-	env = env_get("panel");
-	if (!env) {
-		printf("Can't get panel env\n");
-		return -ENODEV;
-	}
-
 	ret = fdt_node_check_compatible(blob, node, env);
 	if (ret < 0)
 		return -ENODEV;
@@ -438,8 +455,24 @@ int ft_board_setup(void *blob, struct bd_info *bd)
 	if (!ret)
 		return 0;
 
-	do_fixup_by_path_string(blob, "/dsi@fe060000/panel@0",
-				"compatible", env);
+	/* Panels don't match, search by first compatible value. */
+	for (i = 0; i < ARRAY_SIZE(rg353_panel_details); i++) {
+		if (!strcmp(env, rg353_panel_details[i].panel_compat[0])) {
+			panel = &rg353_panel_details[i];
+			break;
+		}
+	}
+
+	if (!panel) {
+		printf("Unable to identify panel by compat string\n");
+		return -ENODEV;
+	}
+
+	/* Set the compatible with the auto-detected values */
+	fdt_setprop_string(blob, node, "compatible", panel->panel_compat[0]);
+	if (panel->panel_compat[1])
+		fdt_appendprop_string(blob, node, "compatible",
+				      panel->panel_compat[1]);
 
 	return 0;
 }
-- 
2.34.1