i.MX6 Dual Lite hang at u-boot because IPUIRQ_2_STATREG check

[m_c]

Customer found i.MX6 Dual Lite hang randomly at u-boot because IPUIRQ_2_STATREG check.

It only happen power supply 2 min, and shutdown 1 min at 60C. But not happen at 25~30C.

Also not happen power always supply at 60C by reboot at kernel.

i.MX6 Dual Lite

DDR3 2GB

Yocto 1.7

u-boot 2014.04

kernel 3.14.28

<uboot_root>/driver/video/ipu_disp.c

void ipu_dp_dc_disable(ipu_channel_t channel, unsigned char swap)

{

...

                /* Make sure that we leave at the irq starting edge */

                __raw_writel(IPUIRQ_2_MASK(irq), IPUIRQ_2_STATREG(irq));

                do {

                        reg = __raw_readl(IPUIRQ_2_STATREG(irq));

                } while (!(reg & IPUIRQ_2_MASK(irq)));

}

(PS: IPUIRQ_2_MASK(irq)=8, IPUIRQ_2_STATREG(irq) = 0x2600238)

[igorpadykov]

Hi m.c.

as this depends on temperature, may be suggested to

check Design Check List, in particular capacitor recommendations

and check power suppiles with oscilloscope during power up sequence

https://community.freescale.com/docs/DOC-93819  

Also please check that no external voltages were applied to processor before power-up.

Best regards
igor
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[chrislin_wpi]

Dear Igor,

We also have same problem at temperature 25C.

Our BSP U-boot version is U-Boot 2016.03. Kernel version is 4.1.15_2.0.0_ga.

The fail rate is 10%.

Do you have any suggestion for the hardware check point?

For the firmware, I found the patch on the website as below:

[U-Boot] imx: ipu: fix occasional hang following disabling of channel - Patchwork 

it add 50ms delay after ipu_dp_dc_disable(channel, 0).

Do you have any comment for it?

Best Regards

Chris Lin

[igorpadykov]

Hi Chris

one can try patches on

Patch to support uboot logo keep from uboot to kernel for NXP Linux and Android BSP (HDMI, LCD and L... 

use nxp uboot

uboot-imx - i.MX U-Boot 

Best regards
igor