dirty_lines_start=219 is larger than dirty_lines_end=0. Shouldn't happen, will do full display update

[notro]

When compiling adafruit22fb into the kernel, the following appears in the log at boot:

graphics fb1: adafruit22fb frame buffer, 75 KiB video memory, 16 KiB buffer memory, fps=10, spi0.0 at 32 MHz, GPIO25 for reset
bcm2708_spi bcm2708_spi.0: SPI Controller at 0x20204000 (irq 80)
adafruit22fb spi0.0: fbtft_update_display: dirty_lines_start=219 is larger than dirty_lines_end=0. Shouldn't happen, will do full display update
adafruit22fb spi0.0: fbtft_update_display: dirty_lines_start=219 is larger than dirty_lines_end=0. Shouldn't happen, will do full display update
adafruit22fb spi0.0: fbtft_update_display: dirty_lines_start=219 is larger than dirty_lines_end=0. Shouldn't happen, will do full display update
adafruit22fb spi0.0: fbtft_update_display: dirty_lines_start=219 is larger than dirty_lines_end=0. Shouldn't happen, will do full display update
adafruit22fb spi0.0: fbtft_update_display: dirty_lines_start=219 is larger than dirty_lines_end=0. Shouldn't happen, will do full display update

This doesn't affect the working of the driver/display. It states that an unexpected thing happended, and that it is rectified.

I haven't had time to look into it.

If someone will look into it:
Compile fbtft-core.c with DEBUG to find out which framebuffer function that is triggering this display update.

[notro]

I have turned off this message when debug=0 : 286287f

The warning shows up when using the display as boot console. But I don't know why.