From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) (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 7CACF2405EB for ; Thu, 5 Mar 2026 08:36:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=60.244.123.138 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772699785; cv=none; b=EaDzyq/OexSnMYp7EEPr13/1xGFNDzsZ4iWzbOHLS49x1maRhX0CsGbsV/620ra4O+wAigFnsfGpq9Jq40BpUWcF3xmzpwHUhrAKZFIxRI2oMhxZv4iKUeyYkYoTc/fiRSe5sjMrt7VS/x0lz3meW20Y0BPadebw8Xup5qtYFcQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772699785; c=relaxed/simple; bh=7cFKIXD7/t7HyaEzBB0fiK1PXCn6vl5jUOFCD22aAKI=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=XiX0skQLi+nWBKdMk1qPYtd4qDzmCIwZ9n9s8BV5rYCDezgiCapZ4gQ9k8NrbBKJPsE08eSYIzxD5Shnpx9BYhKjYsN5uLKKOC2sxmTqsN3yuycvD0U7W2xuvzuu37xlY9jNEMiPimPcBdo/Y9Eqkk409zytGqi17LqQNtEJLc0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com; spf=pass smtp.mailfrom=mediatek.com; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b=QisUPOzV; arc=none smtp.client-ip=60.244.123.138 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mediatek.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="QisUPOzV" X-UUID: 616acab8186e11f1bcd7499a721e883d-20260305 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=hatXOazS/PMgDqI8FQgcj0SgTxYF3DGwz2EXpKXIKtE=; b=QisUPOzV5pVZZT3QHIQpjmaxtm6b1b8cR90Qav9Atc7pwW43bjTFNx9THt3PUtY9qA1gzRUDwPMoZ0wjYTOqQ4c4bmvqwhGbmDh9sm8C2GsfEzGnmRUL3/jDebLw8266zHgtzGYWg+LK8FXn+HmqmjcOxhtIGiO0tvaNfvgnaeU=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.11,REQID:a7c401d1-cc52-41b3-909e-00ccd2f38262,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:89c9d04,CLOUDID:55e18c7b-8c8a-4fc4-88c0-3556e7711556,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102|123|836|888|898,TC:-5,Content:0| 15|50,EDM:-3,IP:nil,URL:0,File:130,RT:0,Bulk:nil,QS:nil,BEC:-1,COL:0,OSI:0 ,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 616acab8186e11f1bcd7499a721e883d-20260305 Received: from mtkmbs13n2.mediatek.inc [(172.21.101.108)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 54172591; Thu, 05 Mar 2026 16:36:18 +0800 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.29; Thu, 5 Mar 2026 16:36:17 +0800 Received: from mtksitap99.mediatek.inc (10.233.130.16) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.2562.29 via Frontend Transport; Thu, 5 Mar 2026 16:36:17 +0800 From: To: Matthias Brugger , AngeloGioacchino Del Regno CC: , , Subject: [PATCH 0/2] ufs: add delay for VCC ramp-up stability Date: Thu, 5 Mar 2026 16:29:13 +0800 Message-ID: <20260305083610.2672344-1-ed.tsai@mediatek.com> X-Mailer: git-send-email 2.45.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-MTK: N Hi, This patch series resolves a link stability issue found on our certain platforms where the VCC regulator has a slow ramp-up time. To fix this, a delay is needed after VCC is turned on. The solution is implemented in two parts: 1. Introduced the new host quriks, UFSHCD_QUIRK_VCC_ON_DELAY. 2. Applied in our new platform with UFS5 device to enusre the VCC is ready before we enable the clocks.