snd_csa issues in -CURRENT

Hi all,

Since I upgraded from 4.8 to 5.1, I've been following the -CURRENT
branch, doing a new kernel/world roughly once a week. Since the upgrade,
and without exception, I have had some issues with the snd_csa driver
that are slowly getting on my nerves.

Whenever I play back audio, be it mp3's or oggs or videos, no matter
what player I use, there will be occational clicks and pops and hickups
in the sound. This was most definitely not the case on 4.8, so something
must have happened either to the driver or to the subsystems its talking
to, causing this to happen.

My sound chipset is, according to pciconf -l -v :
csa0_at_pci0:5:0:  class=0x040100 card=0x01531014 chip=0x60031013 rev=0x01
hdr=0x00 'Cirrus Logic'
    device   = 'Crystal CS4610/14/22/24/30 SoundFusion PCI Audio
Accelerator'

This is a IBM ThinkPad T21, and the rest of pciconf -l -v is listed
below.

If anyone has a clue, I'd appreciate whatever hints to get rid of these
distortions. Apart from them, audio works fine - no instabilities or
anything.

Best regards,
Eirik Oeverby

[root_at_ranger] ~$ pciconf -l -v
agp0_at_pci0:0:0:  class=0x060000 card=0x00000000 chip=0x71908086 rev=0x03
hdr=0x00    vendor   = 'Intel Corporation'
    device   = '82443BX/ZX 440BX/ZX CPU to PCI Bridge (AGP Implemented)'
    class    = bridge
    subclass = HOST-PCI
pcib1_at_pci0:1:0: class=0x060400 card=0x00000000 chip=0x71918086 rev=0x03
hdr=0x01    vendor   = 'Intel Corporation'
    device   = '82443BX/ZX 440BX/ZX AGPset PCI-to-PCI bridge'
    class    = bridge
    subclass = PCI-PCI
cbb0_at_pci0:2:0:  class=0x060700 card=0x01301014 chip=0xac1b104c rev=0x03
hdr=0x02    vendor   = 'Texas Instruments (TI)'
    device   = 'PCI1450 PC card CardBus Controller'
    class    = bridge
    subclass = PCI-CardBus
cbb1_at_pci0:2:1:  class=0x060700 card=0x01301014 chip=0xac1b104c rev=0x03
hdr=0x02    vendor   = 'Texas Instruments (TI)'
    device   = 'PCI1450 PC card CardBus Controller'
    class    = bridge
    subclass = PCI-CardBus
fxp0_at_pci0:3:0:  class=0x020000 card=0x24088086 chip=0x12298086 rev=0x09
hdr=0x00    vendor   = 'Intel Corporation'
    device   = '82557/8/9 EtherExpress PRO/100(B) Ethernet Adapter'
    class    = network
    subclass = ethernet
none0_at_pci0:3:1: class=0x070002 card=0x24088086 chip=0x000c115d rev=0x00
hdr=0x00    vendor   = 'Xircom'
    device   = 'MPCI 3A56GSP-100 PA Mini-PCI V.90 56k Modem'
    class    = simple comms
    subclass = UART
csa0_at_pci0:5:0:  class=0x040100 card=0x01531014 chip=0x60031013 rev=0x01
hdr=0x00    vendor   = 'Cirrus Logic'
    device   = 'Crystal CS4610/14/22/24/30 SoundFusion PCI Audio
Accelerator'    class    = multimedia
    subclass = audio
isab0_at_pci0:7:0: class=0x068000 card=0x00000000 chip=0x71108086 rev=0x02
hdr=0x00    vendor   = 'Intel Corporation'
    device   = '82371AB/EB/MB PIIX4/4E/4M ISA Bridge'
    class    = bridge
    subclass = PCI-unknown
atapci0_at_pci0:7:1:       class=0x010180 card=0x00000000 chip=0x71118086
rev=0x01 hdr=0x00    vendor   = 'Intel Corporation'
    device   = '82371AB/EB/MB PIIX4/4E/4M IDE Controller'
    class    = mass storage
    subclass = ATA
uhci0_at_pci0:7:2: class=0x0c0300 card=0x00000000 chip=0x71128086 rev=0x01
hdr=0x00    vendor   = 'Intel Corporation'
    device   = '82371AB/EB/MB PIIX4/4E/4M USB Interface'
    class    = serial bus
    subclass = USB
none1_at_pci0:7:3: class=0x068000 card=0x00000000 chip=0x71138086 rev=0x03
hdr=0x00    vendor   = 'Intel Corporation'
    device   = '82371AB/EB/MB PIIX4/4E/4M Power Management Controller'
    class    = bridge
    subclass = PCI-unknown
none2_at_pci1:0:0: class=0x030000 card=0x017f1014 chip=0x8c125333 rev=0x13
hdr=0x00    vendor   = 'S3 Incorporated'
    device   = '86C270 Savage/MX,274 Savage/IX,290 Savage/MX+MV,294
Savage/IX+MV'    class    = display
    subclass = VGA
fwohci0_at_pci5:0:0:       class=0x0c0010 card=0x00000000 chip=0x8023104c
rev=0x00 hdr=0x00    vendor   = 'Texas Instruments (TI)'
    device   = 'TSB43AB22/A IEEE1394a-2000 OHCI PHY/Link-Layer Ctrlr'
    class    = serial bus
    subclass = FireWire
[root_at_ranger] ~$