kernel/linux.git/drivers/staging/fbtft, branch master

staging: fbtft: Update RA8875 Kconfig help description

2026-03-09T16:46:57+00:00

The current description is too brief. Update the description to include the manufacturer (RAiO) and the supported resolution (up to 800x480 pixels) to help users identify the correct driver. Signed-off-by: Adam Azuddin Reviewed-by: Andy Shevchenko Link: https://patch.msgid.link/aaf9uQOBzCwQuff4@marchy Signed-off-by: Greg Kroah-Hartman

fbtft: Update REAMDE to slow down the stream of undesired cleanups

2026-03-09T16:05:48+00:00

Lately the enormous amount of some untested cleanups started coming to a mailing list. This adds an unneeded and undesired burden on the reviewers and maintainers. Try to stop that by clearly state what we accept and on what conditions in the README file. Signed-off-by: Andy Shevchenko Link: https://patch.msgid.link/20260226080845.4081732-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman

staging: fbtft: fb_tinylcd: replace udelay() with fsleep()

2026-02-23T14:43:56+00:00

fsleep() is the preferred modern API for flexible sleeping as it automatically selects the best sleep mechanism based on the duration. Replace udelay() with fsleep() to improve power efficiency. init_display() is a driver initialization callback which runs in sleeping context, so fsleep() is safe to use here. Signed-off-by: Tomasz Unger Acked-by: Andy Shevchenko Link: https://patch.msgid.link/20260219142942.74087-1-tomasz.unger@yahoo.pl Signed-off-by: Greg Kroah-Hartman

staging: fbtft: Remove duplications of fbtft_set_addr_win()

2026-02-23T14:42:45+00:00

Lots of drivers duplicate the default fbtft_set_addr_win(). Just use the default instead. Signed-off-by: Nam Cao Reviewed-by: Andy Shevchenko Link: https://patch.msgid.link/20260213085927.3673653-1-namcao@linutronix.de Signed-off-by: Greg Kroah-Hartman

staging: fbtft: fix unchecked write return value in fb_agm1264k-fl

2026-02-23T14:38:15+00:00

The second call to par->fbtftops.write() does not capture the return value, so the subsequent error check tests a stale value from the first write call. Add the missing assignment so the error check applies to the correct write operation. Signed-off-by: Artem Lytkin Acked-by: Andy Shevchenko Link: https://patch.msgid.link/20260207220523.3816-1-iprintercanon@gmail.com Signed-off-by: Greg Kroah-Hartman

staging: fbtft: Optimize partial write()

2026-02-23T14:08:54+00:00

When user write() only to part of the screen, the driver still updates the entire screen. That wastes CPU cycles. Optimize by updating only the changed lines. Also remove a "special case" in fbtft_mkdirty() as its only user is removed in this patch. Tested with an Adafruit ILI9340 (drivers/staging/fbtft/fb_ili9340.c). Improvement is measured by a pair of trace_printk() at the beginning of fb_write() and at the end of fbtft_deferred_io(). Update type Before After ==================================== full screen 196ms 200ms half screen 200ms 124ms quarter screen 193ms 81ms one pixel 199ms 43ms It is interesting to note that if the deferred IO's delay time (40ms) is subtracted, then the time amount scales linearly with the write size. Reviewed-by: Andy Shevchenko Signed-off-by: Nam Cao Link: https://patch.msgid.link/20260216005730.4535-1-namcao@linutronix.de Signed-off-by: Greg Kroah-Hartman

staging: fbtft: fix spelling mistake "dinamically" -> "dynamically"

2026-02-23T14:08:50+00:00

Correct a typo in the fb_ili9163 driver. Found by codespell. Signed-off-by: Santiago Almeida Link: https://patch.msgid.link/20260212055402.457375-1-santiagoalmeidaburbano@gmail.com Signed-off-by: Greg Kroah-Hartman

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

staging: fbtft: Make framebuffer registration message debug-only

2026-02-14T10:09:47+00:00

The framebuffer registration message is informational only and not useful during normal operation. Convert it to debug-level logging to keep the driver quiet when working correctly. Suggested-by: Greg Kroah-Hartman Reviewed-by: Andy Shevchenko Signed-off-by: Chintan Patel Signed-off-by: Helge Deller

staging: fbtft: Fix build failure when CONFIG_FB_DEVICE=n

2026-02-14T10:09:47+00:00

When CONFIG_FB_DEVICE is disabled, struct fb_info does not provide a valid dev pointer. Direct dereferences of fb_info->dev therefore result in build failures. Fix this by avoiding direct accesses to fb_info->dev and switching the affected debug logging to framebuffer helpers that do not rely on a device pointer. This fixes the following build failure reported by the kernel test robot. Fixes: a06d03f9f238 ("staging: fbtft: Make FB_DEVICE dependency optional") Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202601110740.Y9XK5HtN-lkp@intel.com Reviewed-by: Andy Shevchenko Signed-off-by: Chintan Patel Signed-off-by: Helge Deller