wireguard-linux/drivers/staging/fbtft, branch stable

staging: fbtft: fix typo in comment in fb_upd161704.c

2026-07-07T09:22:36Z

Fix spelling mistake found by codespell: "cencter" -> "center". Signed-off-by: Tomasz Unger Reviewed-by: Andy Shevchenko Link: https://patch.msgid.link/20260611-upd161704-typo-v1-1-2e51387c3b28@yahoo.pl Signed-off-by: Greg Kroah-Hartman

staging: fbtft: Use sysfs_emit_at() to print to sysfs file

2026-07-07T09:22:31Z

This scnprintf() uses the wrong limit. It should be "PAGE_SIZE - len" instead of just PAGE_SIZE. We're not going to hit the limit in real life since we are printing at most FBTFT_GAMMA_MAX_VALUES_TOTAL (128) u32 values, however, it's still worth fixing. Use sysfs_emit_at() to fix this since this is a sysfs file. Fixes: c296d5f9957c ("staging: fbtft: core support") Signed-off-by: Dan Carpenter Reviewed-by: Andy Shevchenko Link: https://patch.msgid.link/ah_Y_Y2RtqeGxchF@stanley.mountain Signed-off-by: Greg Kroah-Hartman

staging: fbtft: remove unused function fbtft_write_gpio16_wr_latched

2026-05-04T14:49:10Z

The function fbtft_write_gpio16_wr_latched is not referenced anywhere in the driver and only contains a stub implementation. Remove it from the driver. Signed-off-by: Hungyu Lin Reviewed-by: Andy Shevchenko Link: https://patch.msgid.link/20260430102529.25019-1-dennylin0707@gmail.com Signed-off-by: Greg Kroah-Hartman

staging: fbtft: Use %pe format specifier for error pointers

2026-04-27T11:01:56Z

The %pe format specifier resolves error pointers to their symbolic representation. Previously %ld with PTR_ERR() was being used, %pe is a better alternative. Fixes the following coccinelle warnings reported by coccicheck: WARNING: Consider using %pe to print PTR_ERR() Testing: I do not own the hardware, therefore I could not perform hardware testing. Compile tested only. Signed-off-by: Mahad Ibrahim Link: https://patch.msgid.link/20260412144552.18493-1-mahad.ibrahim.dev@gmail.com Signed-off-by: Greg Kroah-Hartman

staging: fbtft: Update RA8875 Kconfig help description

2026-03-09T16:46:57Z

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

2026-03-09T16:05:48Z

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()

2026-02-23T14:43:56Z

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()

2026-02-23T14:42:45Z

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

2026-02-23T14:38:15Z

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()

2026-02-23T14:08:54Z

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