SK-AM62B: AM62 LVDS panel not working on customer's PCB

May someone provide the related patch for enabling the LVDS panel?

There are something we never know from the doc:

1. PWM setting

2. LVDS clock

3. DRM 

4. Compile option related.

Hello Rio,

1. Have you probed the PCLK? If yes, do you see the frequency of your choice?

2. Could you please run kmstest in Linux and share it's output?

3. No need to worry about compiler or DRM and just ensure your timings are defined in the following file correctly: 
3a: https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/drivers/gpu/drm/panel/panel-simple.c?h=ti-linux-5.10.y#n2821 <----- Timing defined here
3b: https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am625-sk-oldi-panel.dts?h=ti-linux-5.10.y <-------- DTS entry

Regards,
Krunal

Hi.

Please check if this setting is correct, I believe the answer is yes.

We still have no PCLK out here.

Any clues?

BR Rio

main_oldi0_pins_default: main-oldi0-pins-default {
pinctrl-single,pins = <
AM62X_IOPAD(0x0260, PIN_OUTPUT, 0) /* V, (AA5) OLDI0_A0N */
AM62X_IOPAD(0x025c, PIN_OUTPUT, 0) /* V, (Y6) OLDI0_A0P */
AM62X_IOPAD(0x0268, PIN_OUTPUT, 0) /* V, (AD3) OLDI0_A1N */
AM62X_IOPAD(0x0264, PIN_OUTPUT, 0) /* V, (AB4) OLDI0_A1P */
AM62X_IOPAD(0x0270, PIN_OUTPUT, 0) /* V, (Y8) OLDI0_A2N */
AM62X_IOPAD(0x026c, PIN_OUTPUT, 0) /* V, (AA8) OLDI0_A2P */
AM62X_IOPAD(0x0278, PIN_OUTPUT, 0) /* V, (AB6) OLDI0_A3N */
AM62X_IOPAD(0x0274, PIN_OUTPUT, 0) /* V, (AA7) OLDI0_A3P */
AM62X_IOPAD(0x0280, PIN_OUTPUT, 0) /* V, (AC6) OLDI0_A4N */ /*No used, by AAEON*/
AM62X_IOPAD(0x027c, PIN_OUTPUT, 0) /* V, (AC5) OLDI0_A4P */ /*No used, by AAEON*/
AM62X_IOPAD(0x0288, PIN_OUTPUT, 0) /* V, (AE5) OLDI0_A5N */ /*No used, by AAEON*/
AM62X_IOPAD(0x0284, PIN_OUTPUT, 0) /* V, (AD6) OLDI0_A5P */ /*No used, by AAEON*/
AM62X_IOPAD(0x0290, PIN_OUTPUT, 0) /* V, (AE6) OLDI0_A6N */ /*No used, by AAEON*/
AM62X_IOPAD(0x028c, PIN_OUTPUT, 0) /* V, (AD7) OLDI0_A6P */ /*No used, by AAEON*/
AM62X_IOPAD(0x0298, PIN_OUTPUT, 0) /* V, (AD8) OLDI0_A7N */ /*No used, by AAEON*/
AM62X_IOPAD(0x0294, PIN_OUTPUT, 0) /* V, (AE7) OLDI0_A7P */ /*No used, by AAEON*/
AM62X_IOPAD(0x02a0, PIN_OUTPUT, 0) /* V, (AD4) OLDI0_CLK0N */
AM62X_IOPAD(0x029c, PIN_OUTPUT, 0) /* V, (AE3) OLDI0_CLK0P */
AM62X_IOPAD(0x02a8, PIN_OUTPUT, 0) /* V, (AE4) OLDI0_CLK1N */
AM62X_IOPAD(0x02a4, PIN_OUTPUT, 0) /* V, (AD5) OLDI0_CLK1P *

Hi Rich,

1. Is your customer using single link LVDS or dual link lvds?

2. As mentioned in previous message "Could you please run kmstest in Linux and share it's output?"

Regards,
Krunal

Hi Krunal:

Customer is using Single Link LVDS.

Do you mean the TI AM62 EVM using the Dual Link LVDS? please confirm.

BR Rio

Yes, AM62x is configured for dual link and refer to the following thread for single link: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1200777/processor-sdk-am62x-lvds-and-rgb/4563109#4563109. Also, share kmstest output and if you see permission denied, run the command "/etc/init.d/weston stop"

Regards,
Krunal