Update of /cvsroot/alsa/alsa-kernel/Documentation/DocBook
In directory sc8-pr-cvs1:/tmp/cvs-serv4104
Modified Files:
writing-an-alsa-driver.tmpl
Log Message:
rewritten the PM part
Index: writing-an-alsa-driver.tmpl
===================================================================
RCS file: /cvsroot/alsa/alsa-kernel/Documentation/DocBook/writing-an-alsa-driver.tmpl,v
retrieving revision 1.10
retrieving revision 1.11
diff -u -r1.10 -r1.11
--- writing-an-alsa-driver.tmpl 2 Jun 2003 12:58:04 -0000 1.10
+++ writing-an-alsa-driver.tmpl 18 Jun 2003 11:10:37 -0000 1.11
@@ -3283,13 +3283,6 @@
<function>udelay()</function> or <function>mdelay()</function>.
</para>
- <para>
- This atomicity problem appears also in the initialization of the
- hardware when the power-management is supported. The functions
- for suspending and resuming the chip must be atomic, i.e. no
- mutex nor sleep can be used in them.
- </para>
-
</section>
<section id="pcm-interface-constraints">
<title>Constraints</title>
@@ -4079,8 +4072,7 @@
</para>
<para>
- These callbacks are non-atomic like the callbacks of control API
- unless they are called during suspend/resume phase.
+ These callbacks are non-atomic like the callbacks of control API.
</para>
<para>
@@ -4094,8 +4086,6 @@
The <structfield>reset</structfield> callback is used to reset
the codec. If the chip requires a special way of reset, you can
define this callback.
- This callback must be atomic when it's called in the suspend
- mode.
</para>
<para>
@@ -5212,6 +5202,13 @@
</para>
<para>
+ For keeping the readability of 2.5 source code, it's recommended to
+ separate the above ifdef condition as the patch file in alsa-driver
+ directory.
+ See <filename>alsa-driver/pci/ali5451.c</filename> for example.
+ </para>
+
+ <para>
The scheme of the real suspend job is as following.
<orderedlist>
@@ -5383,15 +5380,6 @@
</informalexample>
</para>
- <para>
- Last but not least: Please keep in mind that you cannot call
- <function>schedule()</function> during the suspend and the resume
- callbacks. If any delay is necessary, you have to use
- <function>mdelay()</function> or <function>udelay()</function>
- instead of <function>schedule_timeout()</function>!
- Of course, semaphores cannot be used, too, which will invoke sleep
- inside.
- </para>
</chapter>
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