From patchwork Sat Nov 16 08:18:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 13877529 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 09506D68BD2 for ; Sat, 16 Nov 2024 08:24:02 +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=NgXb1td7DF2l84CX27nRb6yiXc8AJKijgPvBho0FrJE=; b=l18nvU0VV0SaEj2ASGwhEj40uB gWGArs9fYvsVqhhMzk9nYngMwYSQeDb7i0RPzYhUeL1Ws+8A1NFMw077V8mkaxzs6ww+bvTKz+KiO sjTsLiGm5xmxOI5e39bmKnkPnP5nESQaWfwk0BKiihgpnBuIF/XoNuJTpL3PcQcr3qWe91c+8KTYc 9MYT5/2vNKoI1LTjDKYXU38LevVneWIfhx8oM+7mT/46rgO6NDyy4hYjO8LDh1FKbOidDHNNHXcUw f9KOPBAPjcANPjG9JqIOFWWclMg3A523o455YEqWPFunVFszLdohN7LJWG/IJxd3mAFZ9od5khQ8x zQhjbYUg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tCE5x-00000005DwI-2HdN; Sat, 16 Nov 2024 08:23:53 +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 1tCE1l-00000005D9V-1PlF; Sat, 16 Nov 2024 08:19:34 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 60040A40085; Sat, 16 Nov 2024 08:17:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6D290C4CEC3; Sat, 16 Nov 2024 08:19:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731745171; bh=GCOmRbv/GyYdnHeXa5q5vrx3cB5TAF+dSdL665F3kuE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=MO5STveOVD0odbSgLIzSj/yq1GdC7poAi7FEnmHg+3sKxl4fm0Aqp6/mvYCGHq5Jo IlnRpPxwGsZZZbTCIqwFWml87iKrbTZOgXkT4x4SdPGCaSXxD+ySsinDvstOy4f20X QPAfXVTugoivf4Rt+OPYCJ2NUaNpec5IJbjGl+CIJXrBkzGSE/l91lRxft3DnOBpyA uBasviRc7HqVfUHf9t/oFITErP3ptGDhSZ2tcI8s01amyOWeHYM52rSaq80jxbC8Vi ME4uodSh3QS8xpRiNXtwRMQ3X544fERN1CrVKqNGZV/fLlwqcHYGH1Z8Qg2AlpB7nF MT9/VM5giFWXA== From: Lorenzo Bianconi Date: Sat, 16 Nov 2024 09:18:25 +0100 Subject: [PATCH v3 4/6] PCI: mediatek-gen3: Add comment about initialization order in mtk_pcie_en7581_power_up() MIME-Version: 1.0 Message-Id: <20241116-pcie-en7581-fixes-v3-4-f7add3afc27e@kernel.org> References: <20241116-pcie-en7581-fixes-v3-0-f7add3afc27e@kernel.org> In-Reply-To: <20241116-pcie-en7581-fixes-v3-0-f7add3afc27e@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-20241116_001933_451006_E00979B2 X-CRM114-Status: UNSURE ( 9.75 ) 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 MediaTek PCIe controller, the Airoha EN7581 requires PHY initialization and power-on before PHY reset deassert. Reviewed-by: Manivannan Sadhasivam 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..dd30530a43b1097871acc9e76a7534f30819432d 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 MediaTek 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");