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Sun, 10 May 2026 07:18:00 -0700 (PDT) Received: from smtpclient.apple ([151.43.111.228]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e702f4042sm127081015e9.14.2026.05.10.07.17.58 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 10 May 2026 07:17:59 -0700 (PDT) From: Francesco Saverio Pavone Content-Type: multipart/mixed; boundary="Apple-Mail=_F5FE587A-12D7-475B-AC16-577BDBC51A0C" Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3864.500.181\)) Subject: [PATCH] ALSA: pcm_drm_eld: rate-limit ELD parsing errors Message-Id: <8104462D-BF7C-4C66-9442-0F3874A128E3@gmail.com> Date: Sun, 10 May 2026 16:17:47 +0200 Cc: broonie@kernel.org, linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org To: perex@perex.cz, tiwai@suse.com X-Mailer: Apple Mail (2.3864.500.181) --Apple-Mail=_F5FE587A-12D7-475B-AC16-577BDBC51A0C Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Hi all, Sending this via attachment because my Postfix relay setup wasn't usable. Patch is straightforward: rate-limit two dev_info() calls in snd_parse_eld() that get triggered on every PCM open against an HDMI codec with no sink attached. Equivalent fix to the one Mark Brown did for hdac_hdmi in June 2025 (lkml.kernel.org/lkml/2025/6/13/1380), just for the generic helper used by ASoC hdmi-codec. Tested on Rock 5B+ (RK3588): two HDMI outputs, only one cable plugged in. Before: ~30 "HDMI: Unknown ELD version 0" lines per probe burst. After: 0. Let me know if anything needs adjusting. Thanks, Sav --Apple-Mail=_F5FE587A-12D7-475B-AC16-577BDBC51A0C Content-Disposition: attachment; filename=0001-ALSA-pcm_drm_eld-rate-limit-ELD-parsing-errors.patch Content-Type: application/octet-stream; x-unix-mode=0644; name="0001-ALSA-pcm_drm_eld-rate-limit-ELD-parsing-errors.patch" Content-Transfer-Encoding: quoted-printable =46rom=205c740f52f5bc1629125588cc7e5a2731baf91e8b=20Mon=20Sep=2017=20= 00:00:00=202001=0AFrom:=20Sav=20= <62543096+dongioia@users.noreply.github.com>=0ADate:=20Sun,=2010=20May=20= 2026=2010:54:00=20+0000=0ASubject:=20[PATCH]=20ALSA:=20pcm_drm_eld:=20= rate-limit=20ELD=20parsing=20errors=0A=0Asnd_parse_eld()=20is=20the=20= generic=20helper=20used=20by=20ASoC=20hdmi-codec,=20equivalent=0Ato=20= the=20hdac_hdmi=20parse=20path=20Mark=20Brown=20rate-limited=20in=0A= lkml.kernel.org/lkml/2025/6/13/1380.=20The=20same=20spam=20shows=20up=20= here=20for=20the=0Asame=20reason.=0A=0AWhen=20a=20HDMI=20sink=20is=20not=20= connected=20(for=20example=20a=20board=20with=20two=20HDMI=0Aoutputs=20= and=20a=20cable=20in=20only=20one=20of=20them),=20userspace=20audio=20= servers=20like=0APipeWire=20keep=20opening=20the=20empty=20card.=20= snd_parse_eld()=20then=20logs=0A=0A=20=20=20=20HDMI:=20Unknown=20ELD=20= version=200=0A=0Aon=20every=20retry.=20On=20rk3588=20that=20easily=20= produces=2030+=20messages=20per=20burst.=0AA=20malformed=20ELD=20(MNL=20= out=20of=20range)=20hits=20the=20same=20code=20path.=20Neither=20is=0A= worth=20a=20separate=20dev_info()=20per=20occurrence;=20switch=20both=20= to=0Adev_info_ratelimited().=0A=0ASigned-off-by:=20Sav=20= <62543096+dongioia@users.noreply.github.com>=0A---=0A=20= sound/core/pcm_drm_eld.c=20|=204=20++--=0A=201=20file=20changed,=202=20= insertions(+),=202=20deletions(-)=0A=0Adiff=20--git=20= a/sound/core/pcm_drm_eld.c=20b/sound/core/pcm_drm_eld.c=0Aindex=20= cb2eebaac85f..1941ee520063=20100644=0A---=20a/sound/core/pcm_drm_eld.c=0A= +++=20b/sound/core/pcm_drm_eld.c=0A@@=20-334,7=20+334,7=20@@=20int=20= snd_parse_eld(struct=20device=20*dev,=20struct=20snd_parsed_hdmi_eld=20= *e,=0A=20=09e->eld_ver=20=3D=20GRAB_BITS(buf,=200,=203,=205);=0A=20=09if=20= (e->eld_ver=20!=3D=20ELD_VER_CEA_861D=20&&=0A=20=09=20=20=20=20= e->eld_ver=20!=3D=20ELD_VER_PARTIAL)=20{=0A-=09=09dev_info(dev,=20"HDMI:=20= Unknown=20ELD=20version=20%d\n",=20e->eld_ver);=0A+=09=09= dev_info_ratelimited(dev,=20"HDMI:=20Unknown=20ELD=20version=20%d\n",=20= e->eld_ver);=0A=20=09=09goto=20out_fail;=0A=20=09}=0A=20=0A@@=20-357,7=20= +357,7=20@@=20int=20snd_parse_eld(struct=20device=20*dev,=20struct=20= snd_parsed_hdmi_eld=20*e,=0A=20=09e->product_id=09=20=20=3D=20= get_unaligned_le16(buf=20+=2018);=0A=20=0A=20=09if=20(mnl=20>=20= ELD_MAX_MNL)=20{=0A-=09=09dev_info(dev,=20"HDMI:=20MNL=20is=20reserved=20= value=20%d\n",=20mnl);=0A+=09=09dev_info_ratelimited(dev,=20"HDMI:=20MNL=20= is=20reserved=20value=20%d\n",=20mnl);=0A=20=09=09goto=20out_fail;=0A=20=09= }=20else=20if=20(ELD_FIXED_BYTES=20+=20mnl=20>=20size)=20{=0A=20=09=09= dev_info(dev,=20"HDMI:=20out=20of=20range=20MNL=20%d\n",=20mnl);=0A--=20=0A= 2.54.0=0A=0A= --Apple-Mail=_F5FE587A-12D7-475B-AC16-577BDBC51A0C--