mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 08:50:54 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
139 lines
5.6 KiB
Plaintext
139 lines
5.6 KiB
Plaintext
|
|
Documentation for the Cirrus Logic/Crystal SoundFusion cs46xx/cs4280 audio
|
|
controller chips (2001/05/11)
|
|
|
|
The cs46xx audio driver supports the DSP line of Cirrus controllers.
|
|
Specifically, the cs4610, cs4612, cs4614, cs4622, cs4624, cs4630 and the cs4280
|
|
products. This driver uses the generic ac97_codec driver for AC97 codec
|
|
support.
|
|
|
|
|
|
Features:
|
|
|
|
Full Duplex Playback/Capture supported from 8k-48k.
|
|
16Bit Signed LE & 8Bit Unsigned, with Mono or Stereo supported.
|
|
|
|
APM/PM - 2.2.x PM is enabled and functional. APM can also
|
|
be enabled for 2.4.x by modifying the CS46XX_ACPI_SUPPORT macro
|
|
definition.
|
|
|
|
DMA playback buffer size is configurable from 16k (defaultorder=2) up to 2Meg
|
|
(defaultorder=11). DMA capture buffer size is fixed at a single 4k page as
|
|
two 2k fragments.
|
|
|
|
MMAP seems to work well with QuakeIII, and test XMMS plugin.
|
|
|
|
Myth2 works, but the polling logic is not fully correct, but is functional.
|
|
|
|
The 2.4.4-ac6 gameport code in the cs461x joystick driver has been tested
|
|
with a Microsoft Sidewinder joystick (cs461x.o and sidewinder.o). This
|
|
audio driver must be loaded prior to the joystick driver to enable the
|
|
DSP task image supporting the joystick device.
|
|
|
|
|
|
Limitations:
|
|
|
|
SPDIF is currently not supported.
|
|
|
|
Primary codec support only. No secondary codec support is implemented.
|
|
|
|
|
|
|
|
NOTES:
|
|
|
|
Hercules Game Theatre XP - the EGPIO2 pin controls the external Amp,
|
|
and has been tested.
|
|
Module parameter hercules_egpio_disable set to 1, will force a 0 to EGPIODR
|
|
to disable the external amplifier.
|
|
|
|
VTB Santa Cruz - the GPIO7/GPIO8 on the Secondary Codec control
|
|
the external amplifier for the "back" speakers, since we do not
|
|
support the secondary codec then this external amp is not
|
|
turned on. The primary codec external amplifier is supported but
|
|
note that the AC97 EAPD bit is inverted logic (amp_voyetra()).
|
|
|
|
DMA buffer size - there are issues with many of the Linux applications
|
|
concerning the optimal buffer size. Several applications request a
|
|
certain fragment size and number and then do not verify that the driver
|
|
has the ability to support the requested configuration.
|
|
SNDCTL_DSP_SETFRAGMENT ioctl is used to request a fragment size and
|
|
number of fragments. Some applications exit if an error is returned
|
|
on this particular ioctl. Therefore, in alignment with the other OSS audio
|
|
drivers, no error is returned when a SETFRAGs IOCTL is received, but the
|
|
values passed from the app are not used in any buffer calculation
|
|
(ossfragshift/ossmaxfrags are not used).
|
|
Use the "defaultorder=N" module parameter to change the buffer size if
|
|
you have an application that requires a specific number of fragments
|
|
or a specific buffer size (see below).
|
|
|
|
Debug Interface
|
|
---------------
|
|
There is an ioctl debug interface to allow runtime modification of the
|
|
debug print levels. This debug interface code can be disabled from the
|
|
compilation process with commenting the following define:
|
|
#define CSDEBUG_INTERFACE 1
|
|
There is also a debug print methodolgy to select printf statements from
|
|
different areas of the driver. A debug print level is also used to allow
|
|
additional printfs to be active. Comment out the following line in the
|
|
driver to disable compilation of the CS_DBGOUT print statements:
|
|
#define CSDEBUG 1
|
|
|
|
Please see the definitions for cs_debuglevel and cs_debugmask for additional
|
|
information on the debug levels and sections.
|
|
|
|
There is also a csdbg executable to allow runtime manipulation of these
|
|
parameters. for a copy email: twoller@crystal.cirrus.com
|
|
|
|
|
|
|
|
MODULE_PARMS definitions
|
|
------------------------
|
|
MODULE_PARM(defaultorder, "i");
|
|
defaultorder=N
|
|
where N is a value from 1 to 12
|
|
The buffer order determines the size of the dma buffer for the driver.
|
|
under Linux, a smaller buffer allows more responsiveness from many of the
|
|
applications (e.g. games). A larger buffer allows some of the apps (esound)
|
|
to not underrun the dma buffer as easily. As default, use 32k (order=3)
|
|
rather than 64k as some of the games work more responsively.
|
|
(2^N) * PAGE_SIZE = allocated buffer size
|
|
|
|
MODULE_PARM(cs_debuglevel, "i");
|
|
MODULE_PARM(cs_debugmask, "i");
|
|
cs_debuglevel=N
|
|
cs_debugmask=0xMMMMMMMM
|
|
where N is a value from 0 (no debug printfs), to 9 (maximum)
|
|
0xMMMMMMMM is a debug mask corresponding to the CS_xxx bits (see driver source).
|
|
|
|
MODULE_PARM(hercules_egpio_disable, "i");
|
|
hercules_egpio_disable=N
|
|
where N is a 0 (enable egpio), or a 1 (disable egpio support)
|
|
|
|
MODULE_PARM(initdelay, "i");
|
|
initdelay=N
|
|
This value is used to determine the millescond delay during the initialization
|
|
code prior to powering up the PLL. On laptops this value can be used to
|
|
assist with errors on resume, mostly with IBM laptops. Basically, if the
|
|
system is booted under battery power then the mdelay()/udelay() functions fail to
|
|
properly delay the required time. Also, if the system is booted under AC power
|
|
and then the power removed, the mdelay()/udelay() functions will not delay properly.
|
|
|
|
MODULE_PARM(powerdown, "i");
|
|
powerdown=N
|
|
where N is 0 (disable any powerdown of the internal blocks) or 1 (enable powerdown)
|
|
|
|
|
|
MODULE_PARM(external_amp, "i");
|
|
external_amp=1
|
|
if N is set to 1, then force enabling the EAPD support in the primary AC97 codec.
|
|
override the detection logic and force the external amp bit in the AC97 0x26 register
|
|
to be reset (0). EAPD should be 0 for powerup, and 1 for powerdown. The VTB Santa Cruz
|
|
card has inverted logic, so there is a special function for these cards.
|
|
|
|
MODULE_PARM(thinkpad, "i");
|
|
thinkpad=1
|
|
if N is set to 1, then force enabling the clkrun functionality.
|
|
Currently, when the part is being used, then clkrun is disabled for the entire system,
|
|
but re-enabled when the driver is released or there is no outstanding open count.
|
|
|