From c1a36101040a71dbc42afca5e329048042e4afef Mon Sep 17 00:00:00 2001 From: Takashi Sakamoto Date: Tue, 24 Apr 2018 22:24:32 +0900 Subject: ALSA: dice: improve support for ancient firmware for DICE In early stage of firmware SDK, DICE seems to lose its backward compatibility due to some registers on global address section. I found this with Alesis Multimix 12 FireWire with ancient firmware (approx. shipped version). According to retrieved log from the unit, global section has 96 byte space. On the other hand, current version of ALSA dice driver assumes that all of supported unit has at least 100 byte space. $ ./firewire-request /dev/fw1 read 0xffffe0000000 28 result: 000: 00 00 00 0a 00 00 00 18 00 00 00 22 00 00 00 8a result: 010: 00 00 00 ac 00 00 01 12 00 00 00 00 00 00 00 00 result: 020: 00 00 00 00 00 00 00 00 This commit adds support for the ancient firmware. Check of global section is loosened to accept the smaller space. The lack of information is already compensated by hard-coded parameters. I experienced that the latest version of Windows driver for this model can't handle this unit, too. This means that TCAT releases firmware SDK without backward compatibility for the ancient firmware. Below list is a early history of driver/firmware package released by Alesis. I investigated on wayback machine on Internet Archive: * Unknown: PAL v1.0.41.2, firmware v1.0.3 * Mar 2006: PAL v1.54.0, firmware v1.0.4 * Dec 2006: PAL v2.0.0.2, firmware v2.0 * Jun 2007: PAL v3.0.41.5, firmware v2.0 * Jul 2007: PAL v3.0.56.2. firmware v2.0 * Jan 2008: PAL v3.0.81.1080, firmware v2.0 If I can assume that firmware version is the same as DICE version, DICE version for the issued firmware may be v1.0.3. According to code base of userspace driver project (FFADO), I can read DICE v1.0.4 supports global space larger than 100 byte. I guess the smaller space of global section is a feature of DICE v1.0.3. Signed-off-by: Takashi Sakamoto Signed-off-by: Takashi Iwai --- sound/firewire/dice/dice-interface.h | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'sound/firewire/dice/dice-interface.h') diff --git a/sound/firewire/dice/dice-interface.h b/sound/firewire/dice/dice-interface.h index 15a484b05298..9cad3d608229 100644 --- a/sound/firewire/dice/dice-interface.h +++ b/sound/firewire/dice/dice-interface.h @@ -174,14 +174,19 @@ */ #define GLOBAL_SAMPLE_RATE 0x05c +/* + * Some old firmware versions do not have the following global registers. + * Windows drivers produced by TCAT lost backward compatibility in its + * early release because they can handle firmware only which supports the + * following registers. + */ + /* * The version of the DICE driver specification that this device conforms to; * read-only. */ #define GLOBAL_VERSION 0x060 -/* Some old firmware versions do not have the following global registers: */ - /* * Supported sample rates and clock sources; read-only. */ -- cgit v1.2.3