From patchwork Mon Nov 18 08:04:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 13878256 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 50B7FD43FEC for ; Mon, 18 Nov 2024 08:10:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=rO/lPSZb8nRec+V1AYL4z/9hDsMUGOgUj+c3xPPWYeU=; b=BoZbIf8TM9jMwdjF3UNjJYLThw zgGO36A1iHbIJo/baEy353T7TCA3ML/InvWCtg2AmsINSRcZ89p7gg5QNRBHyj35mCFN3+IMnofjN Iew3xyCEU8kWlzxpLvm/5skXNhpjDlteTmD0wuxIttgwBqgBLuEKfBTJbt1wiz+VN/3RO1iTeQCVj nSaUz3MwYaXdgrTy+uL8XBgLD0St75YlQ79viYeEq3EplzyN/cYkxQpAqwhLvBHcrfjZVV5N3Sv/X Sma9q6D4XEEmGax4RFUc9n/e2psrh23xKTsgIqd8VEmIT0kz9Bir3ht0bV82zXyidVl2CPeIVAvCe MYitddFw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tCwpm-00000008itm-0SlL; Mon, 18 Nov 2024 08:10:10 +0000 Received: from nyc.source.kernel.org ([2604:1380:45d1:ec00::3]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tCwlJ-00000008iDL-41WB; Mon, 18 Nov 2024 08:05:36 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 9331FA417BD; Mon, 18 Nov 2024 08:03:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 89C3AC4CECC; Mon, 18 Nov 2024 08:05:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731917132; bh=MpFcnXsLs0FykV4/uYqbeWHc6Oz2yoAZD2lwk7/5GiA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=K3h+wdqc2+vd8N2fSa+a+STJtPFjVQh8ET/uuysZZoioX45SIGX7eas+bA20tJ40y LsCowysdMznZeGxfI5SesbDrjRb/jSiEgg9kqfUhwtgpzZqxKbBAtMRSVqPNtgJAqF ZJDyFfok9/ASFk4o6O4MrYa3xZXi9OPL0CHbFqBPnSk8v2XYa/g5/ssIgyvuKaPBub S4fkZCeVTFvUs+DATHKl7eMFgZJMIzl4K8iwJIblUWeDkKv5uOeu/cM0X7wYYutQZ8 a0hfjsrbZEGK4H2tPS7ubg5FmCRPtaxhCP/47d8Qc5isk8rv2kJSoniY/vT5h9gzYf 2RjYeW8FaNvPA== From: Lorenzo Bianconi Date: Mon, 18 Nov 2024 09:04:56 +0100 Subject: [PATCH v4 4/6] PCI: mediatek-gen3: Add comment about initialization order in mtk_pcie_en7581_power_up() MIME-Version: 1.0 Message-Id: <20241118-pcie-en7581-fixes-v4-4-24bb61703ad7@kernel.org> References: <20241118-pcie-en7581-fixes-v4-0-24bb61703ad7@kernel.org> In-Reply-To: <20241118-pcie-en7581-fixes-v4-0-24bb61703ad7@kernel.org> To: Ryder Lee , Jianjun Wang , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Manivannan Sadhasivam , Rob Herring , Bjorn Helgaas , Philipp Zabel , Matthias Brugger , AngeloGioacchino Del Regno , Michael Turquette , Stephen Boyd Cc: linux-pci@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, Lorenzo Bianconi X-Mailer: b4 0.14.2 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241118_000534_108116_4392ABC6 X-CRM114-Status: UNSURE ( 9.92 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a comment in mtk_pcie_en7581_power_up() to clarify, unlike the other MediaTek Gen3 controllers, the Airoha EN7581 requires PHY initialization and power-on before PHY reset deassert. Reviewed-by: Manivannan Sadhasivam Reviewed-by: AngeloGioacchino Del Regno Signed-off-by: Lorenzo Bianconi --- drivers/pci/controller/pcie-mediatek-gen3.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c index 2b80edd4462ad4e9f2a5d192db7f99307113eb8a..e4f890a73cb8ada7423301fa7a9acc3e177d0cad 100644 --- a/drivers/pci/controller/pcie-mediatek-gen3.c +++ b/drivers/pci/controller/pcie-mediatek-gen3.c @@ -928,6 +928,10 @@ static int mtk_pcie_en7581_power_up(struct mtk_gen3_pcie *pcie) */ mdelay(PCIE_EN7581_RESET_TIME_MS); + /* + * Unlike the other MediaTek Gen3 controllers, the Airoha EN7581 + * requires PHY initialization and power-on before PHY reset deassert. + */ err = phy_init(pcie->phy); if (err) { dev_err(dev, "failed to initialize PHY\n");