From 223293205a7265c8b02882461ba8996650048ade Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 06:33:33 +0000
Subject: [PATCH] audio ok

---
 kernel/Documentation/dev-tools/kgdb.rst |   46 +++++++++++++++++++++++++++++++++++-----------
 1 files changed, 35 insertions(+), 11 deletions(-)

diff --git a/kernel/Documentation/dev-tools/kgdb.rst b/kernel/Documentation/dev-tools/kgdb.rst
index d38be58..77b688e 100644
--- a/kernel/Documentation/dev-tools/kgdb.rst
+++ b/kernel/Documentation/dev-tools/kgdb.rst
@@ -274,6 +274,30 @@
 on the initial connect, or to use a debugger proxy that allows an
 unmodified gdb to do the debugging.
 
+Kernel parameter: ``kgdboc_earlycon``
+-------------------------------------
+
+If you specify the kernel parameter ``kgdboc_earlycon`` and your serial
+driver registers a boot console that supports polling (doesn't need
+interrupts and implements a nonblocking read() function) kgdb will attempt
+to work using the boot console until it can transition to the regular
+tty driver specified by the ``kgdboc`` parameter.
+
+Normally there is only one boot console (especially that implements the
+read() function) so just adding ``kgdboc_earlycon`` on its own is
+sufficient to make this work. If you have more than one boot console you
+can add the boot console's name to differentiate. Note that names that
+are registered through the boot console layer and the tty layer are not
+the same for the same port.
+
+For instance, on one board to be explicit you might do::
+
+   kgdboc_earlycon=qcom_geni kgdboc=ttyMSM0
+
+If the only boot console on the device was "qcom_geni", you could simplify::
+
+   kgdboc_earlycon kgdboc=ttyMSM0
+
 Kernel parameter: ``kgdbwait``
 ------------------------------
 
@@ -292,7 +316,7 @@
 Kernel parameter: ``kgdbcon``
 -----------------------------
 
-The ``kgdbcon`` feature allows you to see :c:func:`printk` messages inside gdb
+The ``kgdbcon`` feature allows you to see printk() messages inside gdb
 while gdb is connected to the kernel. Kdb does not make use of the kgdbcon
 feature.
 
@@ -408,7 +432,7 @@
    ``ps``      Displays only the active processes
    ``ps A``    Shows all the processes
    ``summary`` Shows kernel version info and memory usage
-   ``bt``      Get a backtrace of the current process using :c:func:`dump_stack`
+   ``bt``      Get a backtrace of the current process using dump_stack()
    ``dmesg``   View the kernel syslog buffer
    ``go``      Continue the system
    =========== =================================================================
@@ -700,9 +724,9 @@
    The arch-specific portion implements:
 
    -  contains an arch-specific trap catcher which invokes
-      :c:func:`kgdb_handle_exception` to start kgdb about doing its work
+      kgdb_handle_exception() to start kgdb about doing its work
 
-   -  translation to and from gdb specific packet format to :c:type:`pt_regs`
+   -  translation to and from gdb specific packet format to struct pt_regs
 
    -  Registration and unregistration of architecture specific trap
       hooks
@@ -745,7 +769,7 @@
          config. Later run ``modprobe kdb_hello`` and the next time you
          enter the kdb shell, you can run the ``hello`` command.
 
-   -  The implementation for :c:func:`kdb_printf` which emits messages directly
+   -  The implementation for kdb_printf() which emits messages directly
       to I/O drivers, bypassing the kernel log.
 
    -  SW / HW breakpoint management for the kdb shell
@@ -822,7 +846,7 @@
 the UART driver.
 
 When using kgdboc with a UART, the UART driver must implement two
-callbacks in the :c:type:`struct uart_ops <uart_ops>`.
+callbacks in the struct uart_ops.
 Example from ``drivers/8250.c``::
 
 
@@ -848,10 +872,10 @@
 attached keyboard. The keyboard infrastructure is only compiled into the
 kernel when ``CONFIG_KDB_KEYBOARD=y`` is set in the kernel configuration.
 
-The core polled keyboard driver driver for PS/2 type keyboards is in
+The core polled keyboard driver for PS/2 type keyboards is in
 ``drivers/char/kdb_keyboard.c``. This driver is hooked into the debug core
 when kgdboc populates the callback in the array called
-:c:type:`kdb_poll_funcs[]`. The :c:func:`kdb_get_kbd_char` is the top-level
+:c:expr:`kdb_poll_funcs[]`. The kdb_get_kbd_char() is the top-level
 function which polls hardware for single character input.
 
 kgdboc and kms
@@ -863,10 +887,10 @@
 kernel mode setting support.
 
 Every time the kernel debugger is entered it calls
-:c:func:`kgdboc_pre_exp_handler` which in turn calls :c:func:`con_debug_enter`
+kgdboc_pre_exp_handler() which in turn calls con_debug_enter()
 in the virtual console layer. On resuming kernel execution, the kernel
-debugger calls :c:func:`kgdboc_post_exp_handler` which in turn calls
-:c:func:`con_debug_leave`.
+debugger calls kgdboc_post_exp_handler() which in turn calls
+con_debug_leave().
 
 Any video driver that wants to be compatible with the kernel debugger
 and the atomic kms callbacks must implement the ``mode_set_base_atomic``,

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