Today to get kgdb to work on qcom-geni-serial devices you need _something_ to init/power on the UART. This could either the kernel console output or an "agetty" running on the port. If nothing else powers the port then you'll end up getting a silent hang when you try to enter kgdb. Let's fix this. The first patch here is for the tty layer to make sure that we power on the port when we init it for polling. This would be important for any drivers similar to qcom-geni-serial that actually need to be powered on. The second patch here hooks up the poll_init() function for qcom-geni-serial, leveraging an existing function in the driver that does everything we need. Originally these two patches were bundled together as pathes 2 and 3 of a 3-patch series. We no longer need the first patch from the orginal series since we landed a similar patch from Johan [1] instead. The second two patches are still useful, though, so I've reposted them alone and added this cover letter. [1] https://lore.kernel.org/r/20230307164405.14218-1-johan+linaro@xxxxxxxxxx Douglas Anderson (2): serial: uart_poll_init() should power on the UART tty: serial: qcom-geni-serial: Add a poll_init() function drivers/tty/serial/qcom_geni_serial.c | 1 + drivers/tty/serial/serial_core.c | 6 ++++++ 2 files changed, 7 insertions(+) -- 2.40.0.rc1.284.g88254d51c5-goog
