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ALSA: ump: Explicitly reset RPN with Null RPN

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BugLink: https://bugs.launchpad.net/bugs/2084941

[ Upstream commit 50a6dd19dca9446475f023eaa652016bfe5b1cbe ]

RPN with 127:127 is treated as a Null RPN, just to reset the
parameters, and it's not translated to MIDI2.  Although the current
code can work as is in most cases, better to implement the RPN reset
explicitly for Null message.

Link: https://patch.msgid.link/20240731130528.12600-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Takashi Iwai
2024-07-31 15:05:23 +02:00
committed by Mehmet Basaran
parent c687671585
commit e567ec09d2
1 changed files with 14 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
sound/core/ump_convert.c
+14 -5
View File
@@ -287,6 +287,15 @@ static int cvt_legacy_system_to_ump(struct ump_cvt_to_ump *cvt,
return 4;
}
static void reset_rpn(struct ump_cvt_to_ump_bank *cc)
{
cc->rpn_set = 0;
cc->nrpn_set = 0;
cc->cc_rpn_msb = cc->cc_rpn_lsb = 0;
cc->cc_data_msb = cc->cc_data_lsb = 0;
cc->cc_data_msb_set = cc->cc_data_lsb_set = 0;
}
static int fill_rpn(struct ump_cvt_to_ump_bank *cc,
union snd_ump_midi2_msg *midi2,
bool flush)
@@ -312,11 +321,7 @@ static int fill_rpn(struct ump_cvt_to_ump_bank *cc,
midi2->rpn.data = upscale_14_to_32bit((cc->cc_data_msb << 7) |
cc->cc_data_lsb);
cc->rpn_set = 0;
cc->nrpn_set = 0;
cc->cc_rpn_msb = cc->cc_rpn_lsb = 0;
cc->cc_data_msb = cc->cc_data_lsb = 0;
cc->cc_data_msb_set = cc->cc_data_lsb_set = 0;
reset_rpn(cc);
return 1;
}
@@ -374,11 +379,15 @@ static int cvt_legacy_cmd_to_ump(struct ump_cvt_to_ump *cvt,
ret = fill_rpn(cc, midi2, true);
cc->rpn_set = 1;
cc->cc_rpn_msb = buf[2];
if (cc->cc_rpn_msb == 0x7f && cc->cc_rpn_lsb == 0x7f)
reset_rpn(cc);
return ret;
case UMP_CC_RPN_LSB:
ret = fill_rpn(cc, midi2, true);
cc->rpn_set = 1;
cc->cc_rpn_lsb = buf[2];
if (cc->cc_rpn_msb == 0x7f && cc->cc_rpn_lsb == 0x7f)
reset_rpn(cc);
return ret;
case UMP_CC_NRPN_MSB:
ret = fill_rpn(cc, midi2, true);