From 397d697fd4707043511fdad34f2f75274a4a54d0 Mon Sep 17 00:00:00 2001
From: Tim Harvey <tharvey@gateworks.com>
Date: Wed, 29 Sep 2021 15:04:21 -0700
Subject: imx: ventana: update LVDS support

Enable LVDS display detection and panel-specific configuration

Make I2C based LVDS detection and configuration model specific:
- not all boards support LVDS connectors; fail detection that do not
  support LVDS to avoid misdetecting an I2C device as a display
- GPIO configuration is panel specific; use panel name where needed

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
 board/gateworks/gw_ventana/gw_ventana.c | 59 +++++++++++++++++++++++----------
 1 file changed, 42 insertions(+), 17 deletions(-)

diff --git a/board/gateworks/gw_ventana/gw_ventana.c b/board/gateworks/gw_ventana/gw_ventana.c
index 1646806..1c82bd5 100644
--- a/board/gateworks/gw_ventana/gw_ventana.c
+++ b/board/gateworks/gw_ventana/gw_ventana.c
@@ -158,25 +158,54 @@ static void enable_hdmi(struct display_info_t const *dev)
 	imx_enable_hdmi_phy();
 }
 
-static int detect_i2c(struct display_info_t const *dev)
+static int detect_lvds(struct display_info_t const *dev)
 {
+	/* only the following boards support LVDS connectors */
+	switch (board_type) {
+	case GW52xx:
+	case GW53xx:
+	case GW54xx:
+	case GW560x:
+	case GW5905:
+	case GW5909:
+		break;
+	default:
+		return 0;
+	}
+
 	return i2c_set_bus_num(dev->bus) == 0 &&
 		i2c_probe(dev->addr) == 0;
 }
 
 static void enable_lvds(struct display_info_t const *dev)
 {
-	struct iomuxc *iomux = (struct iomuxc *)
-				IOMUXC_BASE_ADDR;
+	struct iomuxc *iomux = (struct iomuxc *)IOMUXC_BASE_ADDR;
 
 	/* set CH0 data width to 24bit (IOMUXC_GPR2:5 0=18bit, 1=24bit) */
 	u32 reg = readl(&iomux->gpr[2]);
 	reg |= IOMUXC_GPR2_DATA_WIDTH_CH0_24BIT;
 	writel(reg, &iomux->gpr[2]);
 
-	/* Enable Backlight */
-	gpio_request(IMX_GPIO_NR(1, 10), "bklt_gpio");
-	gpio_direction_output(IMX_GPIO_NR(1, 10), 0);
+	/* Configure GPIO */
+	switch (board_type) {
+	case GW52xx:
+	case GW53xx:
+	case GW54xx:
+		if (!strncmp(dev->mode.name, "Hannstar", 8)) {
+			SETUP_IOMUX_PAD(PAD_SD2_CLK__GPIO1_IO10 | DIO_PAD_CFG);
+			gpio_request(IMX_GPIO_NR(1, 10), "cabc");
+			gpio_direction_output(IMX_GPIO_NR(1, 10), 0);
+		} else if (!strncmp(dev->mode.name, "DLC", 3)) {
+			SETUP_IOMUX_PAD(PAD_SD2_CLK__GPIO1_IO10 | DIO_PAD_CFG);
+			gpio_request(IMX_GPIO_NR(1, 10), "touch_rst#");
+			gpio_direction_output(IMX_GPIO_NR(1, 10), 1);
+		}
+		break;
+	default:
+		break;
+	}
+
+	/* Configure backlight */
 	gpio_request(IMX_GPIO_NR(1, 18), "bklt_en");
 	SETUP_IOMUX_PAD(PAD_SD1_CMD__GPIO1_IO18 | DIO_PAD_CFG);
 	gpio_direction_output(IMX_GPIO_NR(1, 18), 1);
@@ -208,7 +237,7 @@ struct display_info_t const displays[] = {{
 	.bus	= 2,
 	.addr	= 0x4,
 	.pixfmt	= IPU_PIX_FMT_LVDS666,
-	.detect	= detect_i2c,
+	.detect	= detect_lvds,
 	.enable	= enable_lvds,
 	.mode	= {
 		.name           = "Hannstar-XGA",
@@ -228,7 +257,7 @@ struct display_info_t const displays[] = {{
 	/* DLC700JMG-T-4 */
 	.bus	= 2,
 	.addr	= 0x38,
-	.detect	= NULL,
+	.detect	= detect_lvds,
 	.enable	= enable_lvds,
 	.pixfmt	= IPU_PIX_FMT_LVDS666,
 	.mode	= {
@@ -247,9 +276,9 @@ struct display_info_t const displays[] = {{
 		.vmode          = FB_VMODE_NONINTERLACED
 } }, {
 	/* DLC0700XDP21LF-C-1 */
-	.bus	= 0,
-	.addr	= 0,
-	.detect	= NULL,
+	.bus	= 2,
+	.addr	= 0x38,
+	.detect	= detect_lvds,
 	.enable	= enable_lvds,
 	.pixfmt	= IPU_PIX_FMT_LVDS666,
 	.mode	= {
@@ -270,7 +299,7 @@ struct display_info_t const displays[] = {{
 	/* DLC800FIG-T-3 */
 	.bus	= 2,
 	.addr	= 0x14,
-	.detect	= NULL,
+	.detect	= detect_lvds,
 	.enable	= enable_lvds,
 	.pixfmt	= IPU_PIX_FMT_LVDS666,
 	.mode	= {
@@ -290,7 +319,7 @@ struct display_info_t const displays[] = {{
 } }, {
 	.bus	= 2,
 	.addr	= 0x5d,
-	.detect	= detect_i2c,
+	.detect	= detect_lvds,
 	.enable	= enable_lvds,
 	.pixfmt	= IPU_PIX_FMT_LVDS666,
 	.mode	= {
@@ -358,10 +387,6 @@ static void setup_display(void)
 	    | (IOMUXC_GPR3_MUX_SRC_IPU1_DI0
 	       <<IOMUXC_GPR3_LVDS0_MUX_CTL_OFFSET);
 	writel(reg, &iomux->gpr[3]);
-
-	/* LVDS Backlight GPIO on LVDS connector - output low */
-	SETUP_IOMUX_PAD(PAD_SD2_CLK__GPIO1_IO10 | DIO_PAD_CFG);
-	gpio_direction_output(IMX_GPIO_NR(1, 10), 0);
 }
 #endif /* CONFIG_VIDEO_IPUV3 */
 
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