From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx5.mail-out.lima-city.de (mx5.mail-out.lima-city.de [91.216.248.207]) (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 249044519A2; Wed, 12 Aug 2026 14:03:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.216.248.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786543438; cv=none; b=PkOL9/PKtYtfGkv6tKkyiuG0zpv4MgkKyFhgHx/dzm7PuTNKPBnnKCZi93iYvvP9XoKR1R9tCTcFVz0KlabC1QsefeYTl5WOw3K6/a6nhgfo0VAGlt8elEmOgQN9Mlne5BLL/+vUIPDNBwtBKxh7mPCGIzO+Y1R5I4eaaohKrbs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786543438; c=relaxed/simple; bh=rMVBYVyYP36ufcy949HDGAJ7V8DX2LXC7yMwpaP6hpQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=grEzm4IkU3gHudUaS+Dnwd0sAFAZNYM1Qx7UUHxTUTPb0PN13iM7Q3cuNm7cyU0cgKd+bldsT3HtCPa/oW6qCJSMhIA8M83X2h55/lNPXWUQNW3m3pR4tHCoperTNEGrFm0XfKeEL5X119GSLu+lRKKstcDqERmlR5D5cCr4VZw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=deq.rocks; spf=none smtp.mailfrom=deq.rocks; dkim=pass (2048-bit key) header.d=deq.rocks header.i=@deq.rocks header.b=fzBxrLN4; arc=none smtp.client-ip=91.216.248.207 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=deq.rocks Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=deq.rocks Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=deq.rocks header.i=@deq.rocks header.b="fzBxrLN4" From: Andre Eikmeyer DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=deq.rocks; s=securedbylima-20251205; t=1786543432; bh=rMVBYVyYP36ufcy949HDGAJ7V8DX2LXC7yMwpaP6hpQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fzBxrLN4Mrud48wkeyqtNytP+uFPd3uaF8Iv6QPGsrIVOHalWEmxWXnrQF7NpvzOb EUfMPWcozRi8IUtB2KDyOjKkbIcKa5wsVQHdGayPKede3qKcXSKn0XX1l/Mrd6jkx5 dXYCDKnpyIHEilgfjfO5xOwMiwjeTiDJHLmqmJC94aueZrdDdapa1ciIAz9ZxXVetI Ze5Q18TbBO3/Otrxp+iVWlFWGwiv5gvvCui2iSbA/dj7mBKGVSi1ZVDK5y79+SQq+b UvfEcamt7AyhKSHdCS2S+e8CIkxr43Fdgm6KcrfY4VvXUBV4t2VnifHB2sVnT8gkOb HCEVSyXikPpOQ== To: Takashi Iwai Cc: platform-driver-x86@vger.kernel.org, amd-gfx@lists.freedesktop.org, linux-sound@vger.kernel.org, Atharva Tiwari , Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , David Airlie , Simona Vetter , Kenneth Feng , Jaroslav Kysela , Takashi Iwai , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Andre Eikmeyer Subject: [PATCH v2 3/3] ALSA: hda: allow direct complete with a powered-off GPU Date: Wed, 12 Aug 2026 16:03:47 +0200 Message-ID: <20260812140347.33360-1-dev@deq.rocks> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260812122206.193680-4-dev@deq.rocks> References: <20260812122206.193680-4-dev@deq.rocks> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The HDA controller normally needs different WAKEEN settings for runtime and system suspend, so azx_prepare() prevents direct complete. For a switcheroo audio client whose bound GPU is already runtime suspended and switched off, however, the controller is physically inaccessible and cannot signal wake events. Resuming the HDA function during system suspend also acquires its runtime PM supplier. This powers the discrete GPU back on only to suspend it again and can expose failures while restoring an otherwise unused GPU. Direct complete is now allowed when the bound VGA device is both runtime suspended and reported off by vga_switcheroo. Active GPUs and HDA controllers without a switcheroo binding retain the existing WAKEEN transition. This was tested as part of the MacBookPro15,1 hybrid graphics series on both the 2018 and 2019 revisions. The discrete GPU remains powered off across system suspend when it is unused, and suspend and resume complete successfully. Signed-off-by: Andre Eikmeyer --- Changes in v2: - Move the SUPPORT_VGA_SWITCHEROO guard to the sole call site. - Explain the significance of the positive azx_prepare() return value. sound/hda/controllers/intel.c | 29 +++++++++++++++++++++++++++-- 1 file changed, 27 insertions(+), 2 deletions(-) diff --git a/sound/hda/controllers/intel.c b/sound/hda/controllers/intel.c index 28c55c5..9132907 100644 --- a/sound/hda/controllers/intel.c +++ b/sound/hda/controllers/intel.c @@ -334,6 +334,7 @@ enum { #ifdef SUPPORT_VGA_SWITCHEROO #define use_vga_switcheroo(chip) ((chip)->use_vga_switcheroo) #define needs_eld_notify_link(chip) ((chip)->bus.keep_power) +static struct pci_dev *get_bound_vga(struct pci_dev *pci); #else #define use_vga_switcheroo(chip) 0 #define needs_eld_notify_link(chip) false @@ -1016,6 +1017,26 @@ static void __azx_runtime_resume(struct azx *chip) display_power(chip, false); } +#ifdef SUPPORT_VGA_SWITCHEROO +static bool azx_vga_is_powered_off(struct azx *chip) +{ + struct pci_dev *pci; + bool powered_off = false; + + if (!use_vga_switcheroo(container_of(chip, struct hda_intel, chip))) + return false; + + pci = get_bound_vga(chip->pci); + if (pci) { + powered_off = pm_runtime_suspended(&pci->dev) && + vga_switcheroo_get_client_state(pci) == VGA_SWITCHEROO_OFF; + pci_dev_put(pci); + } + + return powered_off; +} +#endif + static int azx_prepare(struct device *dev) { struct snd_card *card = dev_get_drvdata(dev); @@ -1025,6 +1046,12 @@ static int azx_prepare(struct device *dev) return 0; chip = card->private_data; +#ifdef SUPPORT_VGA_SWITCHEROO + /* A positive return allows the PM core to use direct complete. */ + if (azx_vga_is_powered_off(chip)) + return 1; +#endif + chip->pm_prepared = 1; snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); @@ -1183,8 +1210,6 @@ static const struct dev_pm_ops azx_pm = { static int azx_probe_continue(struct azx *chip); #ifdef SUPPORT_VGA_SWITCHEROO -static struct pci_dev *get_bound_vga(struct pci_dev *pci); - static void azx_vs_set_state(struct pci_dev *pci, enum vga_switcheroo_state state) { -- 2.55.0