From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C3A3733DEFE; Fri, 7 Aug 2026 15:28:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786116542; cv=none; b=k1/ojd5cQ1zVqaIemLsUxUoK7nSb+n+3IOt4oiKqwhX0xv1ohTZrG1NqophuBX37P57MnaOdc+1f7bch4KYR6yfMw1ay48xVt0HXq2CsHL7aehpHgMUgU66TvYxMEqCHinrdfMGNIr1IRfM8euBP2nyKXragudgI8XKuOkYtyV8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786116542; c=relaxed/simple; bh=lsst7jXRymPGWymnavfEjfw1LVk7DwpNY2JociBSBwQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rgeR5ENSvLUE9J+YkLERIByM9ifEdgWtw0KevppdZ/v2BxS39XVcgwL55RkEAl5CKkhq5w2fzof/w4PNdC4i2ovqhVugKj3v0pcaXrmE66tcX/z6K8BwR6ckts6v0oNyfn7W3VlmfiDuMLzDfTu/e9/PeOi4h+IpaEiiYjTi/OQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=VVXCX76t; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="VVXCX76t" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 25A771F000E9; Fri, 7 Aug 2026 15:28:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786116539; bh=aX81Lv9k0MpOoDYEZkNn2ByHn2ldur+A+a2Iut9vsHs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=VVXCX76tf237cmPib6tXb7EV8v9uR/Ddz4bQ2aG2ghr1yg73EIkk42fe11wsD4L3X OF5IWr2eb7JbYqIkXpGdoa6odUJO2GgaDMbe5oOcumSG6YLHcY1l28B8UDpwoAgejb zkZ4Kj6BM+nvEr6kyZ1nK3esxJLKU2w4DJVSD9AU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Alexander Kaplan , Kai Vehmanen , Takashi Iwai , Sasha Levin Subject: [PATCH 6.6 259/261] ALSA: hda: codecs: hdmi: disable keep-alive before audio format change Date: Fri, 7 Aug 2026 16:40:16 +0200 Message-ID: <20260807143421.009851909@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260807143415.358597922@linuxfoundation.org> References: <20260807143415.358597922@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kai Vehmanen [ Upstream commit a3d6d3cedfe87bbd5a677d52b22ac20d28e59cf8 ] When a keep-alive (KAE) silent stream is active on an Intel HDMI/DP codec, opening a real PCM stream reprograms the converter format and the audio infoframe in snd_hda_hdmi_generic_pcm_prepare(). Part of that reprogramming - the converter channel count and the channel mapping in snd_hda_hdmi_setup_audio_infoframe() - is not safe to do while a keep-alive stream is active. This is most visible when switching to a multichannel PCM configuration, where the active channel count actually changes. In that case the newly opened PCM stream plays no sound. Add an optional hdmi_ops .prepare hook, called at the start of the PCM prepare sequence (before the format and infoframe are touched), and implement it for HSW+ to release keep-alive. Keep-alive is then re-enabled as before once the new stream has been set up, in the setup_stream op. Fixes: 15175a4f2bbb ("ALSA: hda/hdmi: add keep-alive support for ADL-P and DG2") Reported-by: Alexander Kaplan Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/work_items/8412 Tested-by: Alexander Kaplan Cc: Signed-off-by: Kai Vehmanen Link: https://patch.msgid.link/20260715180610.1371243-1-kai.vehmanen@linux.intel.com Signed-off-by: Takashi Iwai [ adapted three hunks from the post-6.12 split files (hdmi.c/hdmi_local.h/intelhdmi.c) back into the monolithic sound/pci/hda/patch_hdmi.c, with the prepare hook un-indented one level since 6.12 uses plain mutex_lock() instead of scoped_guard() ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- sound/pci/hda/patch_hdmi.c | 48 +++++++++++++++++++++++++++++++++++++++------ 1 file changed, 42 insertions(+), 6 deletions(-) --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -111,6 +111,15 @@ struct hdmi_ops { hda_nid_t pin_nid, int dev_id, u32 stream_tag, int format); + /* + * Optional hook invoked at the beginning of the PCM prepare + * sequence, before the audio infoframe and stream format are + * (re)programmed. Used to disable keep-alive / silent stream so + * that the format change is not done while keep-alive is active. + */ + void (*prepare)(struct hda_codec *codec, + struct hdmi_spec_per_pin *per_pin); + void (*pin_cvt_fixup)(struct hda_codec *codec, struct hdmi_spec_per_pin *per_pin, hda_nid_t cvt_nid); @@ -2134,6 +2143,9 @@ static int generic_hdmi_playback_pcm_pre per_pin->channels = substream->runtime->channels; per_pin->setup = true; + if (spec->ops.prepare) + spec->ops.prepare(codec, per_pin); + if (get_wcaps(codec, cvt_nid) & AC_WCAP_STRIPE) { stripe = snd_hdac_get_stream_stripe_ctl(&codec->bus->core, substream); @@ -2905,6 +2917,28 @@ static void register_i915_notifier(struc codec->relaxed_resume = 1; } +/* + * prepare ops override for HSW+ + * + * Disable keep-alive before the converter format and audio infoframe are + * reprogrammed by the PCM prepare sequence. Changing the audio format (e.g. + * the channel count when switching to multichannel PCM) while a keep-alive + * stream is active is not safe, so release keep-alive here, early in the + * sequence. It is re-enabled once the new stream has been set up, in + * i915_hsw_setup_stream(). + */ +static void i915_hsw_prepare(struct hda_codec *codec, + struct hdmi_spec_per_pin *per_pin) +{ + struct hdmi_spec *spec = codec->spec; + + if (spec->silent_stream_type == SILENT_STREAM_KAE && per_pin->silent_stream) { + silent_stream_set_kae(codec, per_pin, false); + /* wait for pending transfers in codec to clear */ + usleep_range(100, 200); + } +} + /* setup_stream ops override for HSW+ */ static int i915_hsw_setup_stream(struct hda_codec *codec, hda_nid_t cvt_nid, hda_nid_t pin_nid, int dev_id, u32 stream_tag, @@ -2922,15 +2956,16 @@ static int i915_hsw_setup_stream(struct haswell_verify_D0(codec, cvt_nid, pin_nid); - if (spec->silent_stream_type == SILENT_STREAM_KAE && per_pin && per_pin->silent_stream) { - silent_stream_set_kae(codec, per_pin, false); - /* wait for pending transfers in codec to clear */ - usleep_range(100, 200); - } - res = hdmi_setup_stream(codec, cvt_nid, pin_nid, dev_id, stream_tag, format); + /* + * Keep-alive was disabled in i915_hsw_prepare(), re-enable it now. + * The pin lookup above resolves to the same per_pin that prepare + * used (pin_nid comes from that per_pin), so this stays balanced; a + * NULL per_pin only occurs on a lookup failure that also implies no + * active keep-alive stream to restore. + */ if (spec->silent_stream_type == SILENT_STREAM_KAE && per_pin && per_pin->silent_stream) { usleep_range(100, 200); silent_stream_set_kae(codec, per_pin, true); @@ -3106,6 +3141,7 @@ static int intel_hsw_common_init(struct codec->depop_delay = 0; codec->auto_runtime_pm = 1; + spec->ops.prepare = i915_hsw_prepare; spec->ops.setup_stream = i915_hsw_setup_stream; spec->ops.pin_cvt_fixup = i915_pin_cvt_fixup;