Panel sometimes fails to start

[jepler]

The debugger shows that pio_sm_xfer_data is blocking:

#1  0x0000007f945506c4 in rp1_ioctl (pio=<optimized out>, request=<optimized out>, args=args@entry=0x7f8806e818) at src/piolib/pio_rp1.c:219
#2  0x0000007f945517dc in rp1_pio_sm_xfer_data (pio=<optimized out>, sm=<optimized out>, dir=<optimized out>, data_bytes=<optimized out>, data=<optimized out>) at src/piolib/pio_rp1.c:247
#3  0x0000007f94552e48 in pio_sm_xfer_data (data=0x7f877de010, data_bytes=65532, dir=0, sm=0, pio=0x3445cc60) at ./src/piolib/include/piolib.h:290
#4  piomatter::pio_sm_xfer_data_large (pio=0x3445cc60, sm=0, direction=direction@entry=0, size=<optimized out>, size@entry=202240, databuf=databuf@entry=0x7f877de010) at ./src/include/piomatter/piomatter.h:27
#5  0x0000007f94585b38 in piomatter::piomatter<piomatter::adafruit_matrix_bonnet_pinout_bgr, piomatter::colorspace_rgb888_packed>::blit_thread (this=0x343b6630) at ./src/include/piomatter/piomatter.h:181

dmesg shows that there's a problem with dma

[  391.580761] rp1-pio 1f00178000.pio: DMA wait timed out

OS & firmware:

$ uname -a
Linux m5 6.6.74+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.6.74-1+rpt1 (2025-01-27) aarch64 GNU/Linux
$ rpi-eeprom-update | grep CURRENT
   CURRENT: Wed 22 Jan 00:16:51 UTC 2025 (1737505011)