[CES-3178]

The S6 camera appears to have power-up issues when the board is powered on with the camera connected.
This was addressed in hardware (see ELS-458), but it introduced a worse side effect: the S8 camera now causes
the i.MX8 USB Host Controller to freeze during boot (see ELS-462).

The root cause appears to be the time the S6 camera takes to power up. The Microchip USB2514B hub, when operating
in standalone mode (not configured via I2C), uses a default POWER-ON TIME of 100 ms. This is the delay the hub
waits before attempting to enumerate devices after enabling power to the port via the PRTPWR pins. For the S6 camera,
100 ms does not seem sufficient for it to be fully ready for enumeration, leading to failures.

Connecting the USB2514B to the I2C bus and increasing the POWER-ON TIME to 110 ms resolves the issue. In this configuration,
we set it to 200 ms to be on the safe side.

Author: alexborro

configs/sx8m_revB_config

@@ -5293,7 +5293,7 @@ CONFIG_USB_EHSET_TEST_FIXTURE=y
 # CONFIG_USB_ISIGHTFW is not set
 # CONFIG_USB_YUREX is not set
 # CONFIG_USB_EZUSB_FX2 is not set
-# CONFIG_USB_HUB_USB251XB is not set
+CONFIG_USB_HUB_USB251XB=y
 CONFIG_USB_HSIC_USB3503=y
 # CONFIG_USB_HSIC_USB4604 is not set
 # CONFIG_USB_LINK_LAYER_TEST is not set

dts/ultimainboard5-lvds.dtsi

@@ -41,7 +41,7 @@
     fsl,pins = <
         MX8MM_IOMUXC_SAI3_RXC_GPIO4_IO29        0x080 /* GPIO4 / SAFETY_ENABLED (input) */
         MX8MM_IOMUXC_SAI3_RXFS_GPIO4_IO28       0x080 /* GPIO6 / SOM_BOOT (IMXRT BootMode Enable) */
-        MX8MM_IOMUXC_SAI1_RXC_GPIO4_IO1         0x100 /* GPIO7 / USB RESET_HUB# */
+        MX8MM_IOMUXC_SAI1_RXC_GPIO4_IO1         0x140 /* GPIO7 / USB RESET_HUB# */
         MX8MM_IOMUXC_SAI1_TXC_GPIO4_IO11        0x140 /* GPIO9 */
         MX8MM_IOMUXC_SAI1_TXFS_GPIO4_IO10       0x100 /* GPIO10 / U12 EEPROM WRITE PROTECT */
         MX8MM_IOMUXC_SAI1_MCLK_GPIO4_IO20       0x080 /* GPIO11 / SOM_nRST (IMXRT_nReset) */
@@ -116,6 +116,29 @@
 };
 
 &i2c3 {
+/* CES-3178: The S6 camera appears to have power-up issues when the board is powered on with the camera connected.
+   This was addressed in hardware (see ELS-458), but it introduced a worse side effect: the S8 camera now causes
+   the i.MX8 USB Host Controller to freeze during boot (see ELS-462).
+
+   The root cause appears to be the time the S8 camera takes to power up. The Microchip USB2514B hub, when operating
+   in standalone mode (not configured via I2C), uses a default POWER-ON TIME of 100 ms. This is the delay the hub
+   waits before attempting to enumerate devices after enabling power to the port via the PRTPWR pins. For the S8 camera,
+   100 ms does not seem sufficient for it to be fully ready for enumeration, leading to failures.
+
+   Connecting the USB2514B to the I2C bus and increasing the POWER-ON TIME to 110 ms resolves the issue. In this configuration,
+   we set it to 200 ms to be on the safe side.
+*/
+   
+    usb2514b@2c {
+        compatible = "microchip,usb2514b";
+        reg = <0x2c>;
+        reset-gpios = <&gpio4 01 GPIO_ACTIVE_HIGH>;
+        self-powered;
+        individual-sensing;
+        individual-port-switching;
+        power-on-time-ms = <200>;
+    };
+    
     tca6416@20 {
         compatible = "ti,tca6416";
         reg = <0x20>;
@@ -194,7 +217,7 @@
 
 /* Set pin names for IMXRT control lines */
 &gpio4 {
-    gpio-line-names = "TCA6416A_nINT", "", "", "", "", "", "", "RESET_OUT", 
+    gpio-line-names = "TCA6416A_nINT", "USB2514B_Reset", "", "", "", "", "", "RESET_OUT", 
                       "", "", "", "", "", "", "", "", 
                       "", "", "", "", "IMXRT_nReset", "", "", "", 
                       "", "", "", "", "IMXRT_BootMode_En", "SAFETY_ENABLED", "", "";