[ALSA] cs4281 - fix DLLRDY not seen problem
CS4281 driver
Reset the FPDN bit of the EPPMC register if needed.
Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/pci/cs4281.c b/sound/pci/cs4281.c
index 8b42e86..b6e1854 100644
--- a/sound/pci/cs4281.c
+++ b/sound/pci/cs4281.c
@@ -206,7 +206,10 @@
#define BA0_PMCS 0x0344 /* Power Management Control/Status */
#define BA0_CWPR 0x03e0 /* Configuration Write Protect */
+
#define BA0_EPPMC 0x03e4 /* Extended PCI Power Management Control */
+#define BA0_EPPMC_FPDN (1<<14) /* Full Power DowN */
+
#define BA0_GPIOR 0x03e8 /* GPIO Pin Interface Register */
#define BA0_SPMC 0x03ec /* Serial Port Power Management Control (& ASDIN2 enable) */
@@ -1461,6 +1464,11 @@
int timeout;
int retry_count = 2;
+ /* Having EPPMC.FPDN=1 prevent proper chip initialisation */
+ tmp = snd_cs4281_peekBA0(chip, BA0_EPPMC);
+ if (tmp & BA0_EPPMC_FPDN)
+ snd_cs4281_pokeBA0(chip, BA0_EPPMC, tmp & ~BA0_EPPMC_FPDN);
+
__retry:
tmp = snd_cs4281_peekBA0(chip, BA0_CFLR);
if (tmp != BA0_CFLR_DEFAULT) {