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 497A6391E51; Sat, 17 Oct 2026 17:10:23 +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=1792257024; cv=none; b=TzQhxmnGrgWLn1yhDkAVzC8rc6AXwEZlMs2cyQCJ+bVxLxhjSM7kg7/gH2+yafPVeIG3O9v3BHvYdpjgrzHYF2cEyVjzzHhLhtSOv+lmgR2rNcqH9Qzf6hsYMFolsTlo86a8fVnJxJde+LL6y4BdPfS4FpmmO5+hkHn56VxTtLk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792257024; c=relaxed/simple; bh=lVAFFTjDU6J7SHWa/eQybdd78xyddXitqOZ1awfL7F4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=qx8fx3rEu3c6AY4bGfODN82TEBPpvB62QPiAXbawCSs3/1OQfnLaTldP9ahYwvhYmVtckLCjKQeZIlBRhGh9grqNIGPbLJbA6SeXiEWf4VET2UIrpw5NvmvqcuVZHXqhZZLOio0Iz1UoLHXGZuH0re+MIlPEkbDmUcaPR50aZT0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=vERj2Olw; 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="vERj2Olw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 94D971F000C4; Sat, 17 Oct 2026 17:10:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1792257023; bh=TpVqtKU/cTVw8X1Sw4Ke290R8a43jfeROJfI/C2Fsp0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=vERj2OlwE07aXCI/6XF0K96LmdaCrd7JXjJMImWd1F7tPuzppqw/+4+P9YhrBtHOd nSg7PJg0x3ITzIa8pDxBO4TgWHpp39mWfp2wE2ntfVPiTbrIrOt/XT/oEuqGHxjD6z h2M9sXxufgQCUy0XOclvLkI60EvGqJERsBvSQjOE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Christian=20K=C3=B6nig?= , Alex Deucher , =?UTF-8?q?Francisco=20Beltr=C3=A1n=20Millal=C3=A9n?= , Sasha Levin Subject: [PATCH 6.6 0390/1674] drm/amdgpu: reset VI ASIC on MacBookPro14,3 Date: Sat, 17 Oct 2026 17:44:22 +0200 Message-ID: <20261017160441.118981265@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261017160431.119607952@linuxfoundation.org> References: <20261017160431.119607952@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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Francisco Beltrán Millalén [ Upstream commit a22e5e4f2ebbdbb962cc3233094d189c4dfaa051 ] On a MacBookPro14,3 with a Radeon Pro 555 (Polaris11), the framebuffer is at MC address 0 when amdgpu loads after a cold boot, as the firmware leaves it (MC_VM_FB_LOCATION = 0x007f0000), while the VBIOS ASIC_Init table places it at 0xF4_0000_0000 (0xf47ff400). amdgpu reads the location once, at init, so after a re-POST (S3 resume or GPU reset) the framebuffer has moved and the driver keeps programming the old one: the SMU is handed a table that was never written and the GPU does not come back, which leaves the internal panel black. Resetting the ASIC on load makes ASIC_Init run before the driver reads the location, so the driver uses the VBIOS placement from the start and every later re-POST puts the framebuffer back where it already is. Add the Radeon Pro 555 used in this machine to the existing VI reset quirk table. Tested on a MacBookPro14,3 on 6.18.49 with the quirk table backported (the kernel also carries unrelated local PCI and ACPI patches for this machine). The framebuffer is at 0x000000F400000000 after both cold and warm boot, and the GPU survived 9 S3 cycles (lid close and rtcwake, one of them with the lid closed for about 7.5 minutes and a USB-C disk attached), each followed by a few minutes of 3D load; no ring timeouts or VM faults were reported. The reset adds about 0.23 s to amdgpu init. Suggested-by: Christian König Suggested-by: Alex Deucher Link: https://lore.kernel.org/all/20260924132952.25054-1-fbeltranmillalen@gmail.com/ Assisted-by: Claude:claude-opus-5-5 Signed-off-by: Francisco Beltrán Millalén Signed-off-by: Alex Deucher (cherry picked from commit b6b1d97218518003107d4446fac278fa3e0a19a0) Cc: stable@vger.kernel.org Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/amdgpu/vi.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c index 162077d3bf765..86be88171bbaf 100644 --- a/drivers/gpu/drm/amd/amdgpu/vi.c +++ b/drivers/gpu/drm/amd/amdgpu/vi.c @@ -1419,6 +1419,7 @@ struct vi_reset_quirk { static const struct vi_reset_quirk vi_reset_quirks[] = { { 0x67ef, PCI_VENDOR_ID_APPLE, 0x0190, 0xe3 }, /* Radeon Pro 555X */ { 0x67ef, PCI_VENDOR_ID_APPLE, 0x018f, 0xc2 }, /* Radeon Pro 560X */ + { 0x67ef, PCI_VENDOR_ID_APPLE, 0x017a, 0xc7 }, /* Radeon Pro 555 */ }; static bool vi_need_reset_on_init(struct amdgpu_device *adev) -- 2.53.0