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When using a PD controller to configure a TUSB1044 (Type-C Linear Redriver) over I2C it is best to follow the scheme below for programming the PD in this regard. This scheme also includes support for applications in need of a "virtual" HPD.
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// Register configurations written as follows: (addr, data) // Example assumes following: // Alt DP Mode Source with SWAP = 0; DIR0 = 0; DIR1 = 1; // USB EQ downstream direction: UTX1EQ_SEL = 5 and UTX2EQ_SEL = 5 // USB EQ upstream direction: DRX1EQ_SEL = 2 and DRX2EQ_SEL = 2 // DP EQ: 6 // Initialize EQ each receiver. (0x0A, 0x10) // Make sure EQ_OVERRIDE is set. (0x10, 0x56) // UEQ2 (0x11, 0x56) // UEQ1 (0x20, 0x22) // DEQ2 for TypeC Rx2 port. (0x21, 0x22) // DEQ1 for TypeC Rx1 Port If USB-only normal orientation { (0x11, 0x56) // Set UEQ for UTX1 (0x0A, 0x11) } else if USB-only flip orientation { (0x10, 0x56) // Set UEQ for UTX2 (0x0A, 0x15) } Else if DP-only normal orientation { (0x10, 0x66) // UEQ2 (0x11, 0x66) // UEQ1 (0x0A, 0x12) } Else if DP-only flip orientation { (0x10, 0x66) // UEQ2 (0x11, 0x66) // UEQ1 (0x0A, 0x16) } Else if DP+USB normal orientation { (0x10, 0x66) // Set DP EQ (0x11, 0x56) // Set USB EQ (0x0A, 0x13) } Else if DP+USB flip orientation { (0x10, 0x56) // Set USB EQ (0x11, 0x66) // Set DP EQ (0x0A, 0x17) } Else nothing connected to Type-C { (0x0A, 0x10) (0x10, 0x56) // UEQ2 (0x11, 0x56) // UEQ1 } //For using virtual HPD support. // HPDIN pin assumed to be low. If (DP Alt mode) { If (HPD = removal) { HPDIN_OVERRIDE = 0; } Else //HPD insertion or IRQ_HPD { HPDIN_OVERRIDE = 1; } }