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authorOswald Buddenhagen <oswald.buddenhagen@gmx.de>2023-07-15 19:08:02 +0300
committerTakashi Iwai <tiwai@suse.de>2023-07-17 10:29:07 +0300
commitc435d375fd76733218ff59408a4b1f15e50b2e11 (patch)
treeaf5ef029967fee1b007bdefb6e05a6ed79ec5055 /include/sound/emu10k1.h
parentc960b012ec4747265f0392a31570045d3f982447 (diff)
downloadlinux-c435d375fd76733218ff59408a4b1f15e50b2e11.tar.xz
ALSA: emu10k1: set the "no filtering" bits on PCM voices on Audigy
Given that the filter is already set to neutral for PCM voices, the only observable effect is that the Z1/Z2/FXBUS registers don't have a stray bit set for negative numbers anymore. The bit is below the ones significant for output, but it would mess with 32-bit sample recombination, which we intend to add. kX-project does that, but I had to figure out myself why. Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de> Link: https://lore.kernel.org/r/20230715160802.326872-1-oswald.buddenhagen@gmx.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound/emu10k1.h')
-rw-r--r--include/sound/emu10k1.h11
1 files changed, 7 insertions, 4 deletions
diff --git a/include/sound/emu10k1.h b/include/sound/emu10k1.h
index 7c55a8244747..1af9e6819392 100644
--- a/include/sound/emu10k1.h
+++ b/include/sound/emu10k1.h
@@ -902,6 +902,11 @@ SUB_REG_NC(A_EHC, A_I2S_CAPTURE_RATE, 0x00000e00) /* This sets the capture PCM
#define A_TTDA 0x7a /* Tank Table DMA Address */
#define A_TTDD 0x7b /* Tank Table DMA Data */
+// In A_FXRT1 & A_FXRT2, the 0x80 bit of each byte completely disables the
+// filter (CVCF_CURRENTFILTER) for the corresponding channel. There is no
+// effect on the volume (CVCF_CURRENTVOLUME) or the interpolator's filter
+// (CCCA_INTERPROM_MASK).
+
#define A_FXRT2 0x7c
#define A_FXRT_CHANNELE 0x0000003f /* Effects send bus number for channel's effects send E */
#define A_FXRT_CHANNELF 0x00003f00 /* Effects send bus number for channel's effects send F */
@@ -914,8 +919,6 @@ SUB_REG_NC(A_EHC, A_I2S_CAPTURE_RATE, 0x00000e00) /* This sets the capture PCM
#define A_FXSENDAMOUNT_G_MASK 0x0000FF00
#define A_FXSENDAMOUNT_H_MASK 0x000000FF
-/* 0x7c, 0x7e "high bit is used for filtering" */
-
/* The send amounts for this one are the same as used with the emu10k1 */
#define A_FXRT1 0x7e
#define A_FXRT_CHANNELA 0x0000003f
@@ -1526,10 +1529,10 @@ struct snd_emu10k1_pcm_mixer {
((route[0] | (route[1] << 4) | (route[2] << 8) | (route[3] << 12)) << 16)
#define snd_emu10k1_compose_audigy_fxrt1(route) \
-((unsigned int)route[0] | ((unsigned int)route[1] << 8) | ((unsigned int)route[2] << 16) | ((unsigned int)route[3] << 24))
+((unsigned int)route[0] | ((unsigned int)route[1] << 8) | ((unsigned int)route[2] << 16) | ((unsigned int)route[3] << 24) | 0x80808080)
#define snd_emu10k1_compose_audigy_fxrt2(route) \
-((unsigned int)route[4] | ((unsigned int)route[5] << 8) | ((unsigned int)route[6] << 16) | ((unsigned int)route[7] << 24))
+((unsigned int)route[4] | ((unsigned int)route[5] << 8) | ((unsigned int)route[6] << 16) | ((unsigned int)route[7] << 24) | 0x80808080)
#define snd_emu10k1_compose_audigy_sendamounts(vol) \
(((unsigned int)vol[4] << 24) | ((unsigned int)vol[5] << 16) | ((unsigned int)vol[6] << 8) | (unsigned int)vol[7])