This commit is to fix a warning which is reported in Coverity scan
after device runtime pm is enabled.
Signed-off-by: Roger Wang <roger1.wang@intel.com>
When device runtime pm is enabled on console device, do not suspend
device synchronously on each char transmission, but rather use asynchronous
suspension request.
This will save useless and costly suspension/resumption procedure, which
can involve uart device clock suspension but also pin configuration
to sleep state (which itself involves gpio clock activation ...).
On STM32, using asynch device suspension allows to divide by 3 the
transmission time of a character chain.
Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>
`pm_device_runtime_get` and `pm_device_runtime_put` have returned `0`
when device runtime PM is not enabled since #56222. Manually checking
the state is no longer required.
Additionally, the functions have been able to run in an ISR context
since #60785, which removed the need to special case `k_is_in_isr()`.
Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
Compile the `uart_dev` pointer only when necessary
(when `zephyr,log-uart` is used), this saves 4 bytes in
32-bit systems and 8 bytes in 64-bit systems.
Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Rename the `device` variable in the `struct lbu_cb_ctx` to
`uart_dev`, as it is a convention in Zephyr to not have the
struct variable name after the struct.
Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Updated the `LBU_DEFINE` so that the index is appended only
when given to improve backward compatibility.
When it is depending on the `zephyr,console` node, the backend
is defined as `log_backend_uart`.
When it is depending on the new `zephyr,log-uart` node, the
backend is defined as `log_backend_uart0`,
`log_backend_uart1`, and so on.
Updated the names of the internal variables to follow the same
naming convention.
Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Handling panicking while in an ISR. Instead of attempting to call
`pm_device_get` for each character, ensure that the hardware is enabled
when `log_panic` is called.
Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
Allow the log_backend_uart char_out implementation to integrate with
'Device Runtime Power Management'.
Without using runtime PM, it is impossible for the application to manage
the power state of a UART instance, given that any module in the
application could theoretically LOG_* or printk at any point in time.
This removes the need to manually call `pm_device_state_set` when the
lowest power states must be reached, while still allowing log messages
to be output.
Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
This allows putting the UART backend on a serial device that has to be
quiet unless logging is explicitly enabled at runtime.
Signed-off-by: Armin Brauns <armin.brauns@embedded-solutions.at>
This is mainly to reduce clutter in `subsys/logging`, but also to make
backend management slightly easier.
Signed-off-by: Christopher Friedt <cfriedt@fb.com>
2022-10-01 03:34:48 -07:00
Renamed from subsys/logging/log_backend_uart.c (Browse further)
