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by gizmomouse
Sun Oct 27, 2019 5:22 pm
Forum: Compute Module
Topic: DSI Tearing Effect Support?
Replies: 7
Views: 1007

Re: DSI Tearing Effect Support?

@6by9 Thank you for looking in to this and answering those questions so clearly. I didn't realize that there are multiple display interface modes but upon reflection that makes sense. I was thinking about the VC4. If the Hardware Video Scaler is running from the system clock and the Pixel Valve is r...
by gizmomouse
Fri Oct 25, 2019 11:24 am
Forum: Compute Module
Topic: DSI Tearing Effect Support?
Replies: 7
Views: 1007

Re: DSI Tearing Effect Support?

I've been trying to wrap my head around this issue. I learned a bit about the Direct Render Manager and Broadcom's Video Core 4 and as far as I understand the two can be visualized in the image attached (If I've missed something please let me know): The DRM has the concept of CRTC or CRT Controller ...
by gizmomouse
Tue Oct 22, 2019 10:51 am
Forum: Compute Module
Topic: CM3 power supply design
Replies: 1
Views: 667

Re: CM3 power supply design

Hi, Kudos to making a board, from the components it sounds pretty cool! Either one of those schemes sounds good but make sure to keep power dissipation in mind. The 5V switcher to 3.3V LDO can be an issue if you really are pulling 1A. Even the DDPACK package might cause an issue if you don't pay att...
by gizmomouse
Mon Oct 21, 2019 12:46 am
Forum: Compute Module
Topic: High bandwidth interface to FPGA?
Replies: 27
Views: 6182

Re: High bandwidth interface to FPGA?

@BEB Why was it challenging to use the SMI interface? I'm curious because I designed a board with the SMI interface with an FPGA in mind. I'm a ways away from exercising it but one thing that concerned me was that there doesn't seem to be any dedicated SMI clock, perhaps I missed it. This would impl...
by gizmomouse
Fri Oct 18, 2019 12:07 pm
Forum: Compute Module
Topic: DSI Tearing Effect Support?
Replies: 7
Views: 1007

Re: DSI Tearing Effect Support?

I believe I'm using the full kms driver in my /boot/config.txt I have added the line

Code: Select all

dtoverlay=vc4-kms-v3d
I have not tried it with the fake KMS, I didn't know if there would be issues with my LCD and the firmware.

Should I try it?
by gizmomouse
Fri Oct 18, 2019 11:54 am
Forum: Compute Module
Topic: [SOLVED] DSI Panel JDI LT070ME05000 bringup issues
Replies: 9
Views: 1286

Re: [SOLVED] DSI Panel JDI LT070ME05000 bringup issues

Sure, Here is the schematic RPCM Express Rev A The LCD connector is on page 13 The revision notes on the first page describes all the problems with the hardware design revision. [edit] Regarding the software the only change I did is change 'gpiod_set_value' to 'gpiod_set_value_cansleep' to get rid o...
by gizmomouse
Fri Oct 18, 2019 11:37 am
Forum: Compute Module
Topic: DSI Tearing Effect Support?
Replies: 7
Views: 1007

DSI Tearing Effect Support?

I am seeing tearing with my DSI LCD. I connected the tearing effect signal from the screen to 'TE3', configured it in the overlay but no change. I used the <kernel>/Documentation/devicetree/bindings/display/panel/panel-dsi-cm.txt as a reference, here is my current overlay entry /********************...
by gizmomouse
Wed Oct 16, 2019 5:30 pm
Forum: Compute Module
Topic: [SOLVED] DSI Panel JDI LT070ME05000 bringup issues
Replies: 9
Views: 1286

Re: DSI Panel JDI LT070ME05000 bringup issues

It works! DSI LCD Working I noticed that the documentation for the kernel explicitly states that the reset signal is 1.8V and required a high drive current. When designing the board I missed the high drive current thinking that the LCD would have all the necessary buffers so I had only used a voltag...
by gizmomouse
Sun Oct 13, 2019 6:59 pm
Forum: Compute Module
Topic: [SOLVED] DSI Panel JDI LT070ME05000 bringup issues
Replies: 9
Views: 1286

Re: DSI Panel JDI LT070ME05000 bringup issues

Thanks for the suggestion! I removed the screen, did the capture and received the same error. During all this debugging I got careless and and left a small screw driver on the board and shorted something out. I think it damaged one of the GPIO multiplexers. I'm going to have to bring up another boar...
by gizmomouse
Thu Oct 10, 2019 11:43 am
Forum: Compute Module
Topic: [SOLVED] DSI Panel JDI LT070ME05000 bringup issues
Replies: 9
Views: 1286

Re: DSI Panel JDI LT070ME05000 bringup issues

The gpiod_set_value_cansleep cleared up the warnings but the error persisted. [ 5.298462] vc4-drm soc:gpu: failed to bind 3f700000.dsi (ops vc4_dsi_ops [vc4]): -517 [ 5.302172] vc4-drm soc:gpu: master bind failed: -517 [ 5.306901] asus 0003:04F2:1125.0002: input,hiddev96,hidraw2: USB HID v1.11 Devic...
by gizmomouse
Wed Oct 09, 2019 5:05 pm
Forum: Compute Module
Topic: [SOLVED] DSI Panel JDI LT070ME05000 bringup issues
Replies: 9
Views: 1286

[SOLVED] DSI Panel JDI LT070ME05000 bringup issues

Hi, I'm bringing up a CM3+ board that is attached to a DSI Panel called JDI LT070ME05000 (Link to Ali-Express Source) . Electrically it looks like it is connected correctly. Using previous CM3+ DSI discussions along with the documentation for the panel I have this entry in my overlay file: ... fragm...
by gizmomouse
Tue Oct 08, 2019 10:21 am
Forum: Device Tree
Topic: inv-mpu6050 trigger probe fail -22
Replies: 5
Views: 1115

Re: inv-mpu6050 trigger probe fail -22

For anyone looking for a solution, I can't say that this is it. I need to research if this 'thread_fn' is correct. Once I bring up the rest of the board I can come back to this so, for the moment, this is on the backburner. So far the driver has been stable but be warned.
by gizmomouse
Sat Oct 05, 2019 2:51 am
Forum: Device Tree
Topic: inv-mpu6050 trigger probe fail -22
Replies: 5
Views: 1115

Re: inv-mpu6050 trigger probe fail -22

I looked at another industrial IO sensor, specifically: <kernel>/drivers/iio/gyro/bmg160_core.c this driver uses the 'devm_request_threaded_irq' directly and I found that it used the 'thread_fn' only for events. I looked around the 'inv_mpu6050' driver and found no events to manage so I wrote a smal...
by gizmomouse
Fri Oct 04, 2019 10:56 am
Forum: Device Tree
Topic: inv-mpu6050 trigger probe fail -22
Replies: 5
Views: 1115

Re: inv-mpu6050 trigger probe fail -22

PhillE, Thanks a lot for the feedback, I should have thought about throwing in 'printks'. I checked the pinctrl-sx150x as well as associated files and everything returned with no errors. Using tags I ended up in the file <kernel>/irq/manage.c here is the sequence of functions that let to '__setup_ir...
by gizmomouse
Thu Oct 03, 2019 12:08 pm
Forum: Device Tree
Topic: inv-mpu6050 trigger probe fail -22
Replies: 5
Views: 1115

inv-mpu6050 trigger probe fail -22

Hello, I'm trying to get my Invisense MPU9250 up and running on my board. The MPU9250 is an IMU that is attached to the RPI using I2C, actually it's attached to the host using a GPIO based I2C Multiplexer (Channel 0 or i2c4) and the interrupt is attached to an SX1509 I2C GPIO Expander/Interrupt Cont...
by gizmomouse
Tue Sep 24, 2019 3:19 pm
Forum: Compute Module
Topic: [SOLVED] Compute Module Boot Issues
Replies: 4
Views: 1108

Re: Compute Module Boot Issues

I got the CM3+ 8B version to the console (Getty Login). It looks like that SDCARD Voltage Translator/ESD chip messed up the data just enough that it failed to boot.

I'm going to try to bypass that chip.

Thanks again for the help!
by gizmomouse
Tue Sep 24, 2019 6:51 am
Forum: Compute Module
Topic: [SOLVED] Compute Module Boot Issues
Replies: 4
Views: 1108

Re: Compute Module Boot Issues

Phile, Thanks so much for looking at this, I appreciate you and your team are very busy. Regarding the extra byte, I'm confused as well but the code blocks I pasted are copied directly from the UART output of the bootloader. Obviously something is wrong with the hardware. When I first got the board ...
by gizmomouse
Sun Sep 22, 2019 1:53 am
Forum: Compute Module
Topic: [SOLVED] Compute Module Boot Issues
Replies: 4
Views: 1108

[SOLVED] Compute Module Boot Issues

Hello, I've designed and built a carrier board for the CM3+ Lite. It's in the form factor of a Nintendo Switch and has a lot of peripherals on it including a DSI LCD connector, WIFI, IMU, multi-cell battery... blah blah, there is a lot of stuff and here is a link to the schematic if you are interest...
by gizmomouse
Wed Jun 26, 2019 2:20 pm
Forum: Compute Module
Topic: PI 4 Compute module with pci-e?
Replies: 58
Views: 20683

Re: PI 4 Compute module with pci-e?

Please bring out PCIE on CM4. I have been working on a portable handheld that has an FPGA. I have been grudgingly working with the CM3 planning on attaching the FPGA using the secondary memory interface. I'm not very happy with the throughput I will be able to achieve between the SOC and FPGA but I ...

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