Re: [PATCH v1 2/2] drm/tiny: allow a framebuffer larger than the panel on MIPI DBI drivers

[Jonathan Frazin]

On Thu, Sep 10, 2026 at 2:05 PM <sashiko-bot@xxxxxxxxxx> wrote:
> Since tx_buf was strictly allocated during drm_mipi_dbi_dev_init() to hold
> exactly the panel size, copying based on this inflated width and height will
> overflow tx_buf on the heap.

Confirmed. On a fractional plane SRC_X/SRC_Y the damage iterator rounds
the merged rect out by up to a pixel per axis, so it can exceed the
panel and overflow the mode-sized tx_buf. v2 will clamp the rect back to
the panel in mipi_dbi_fb_dirty().