From mboxrd@z Thu Jan 1 00:00:00 1970 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 C88FCE77188 for ; Wed, 8 Jan 2025 09:54:35 +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:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Bn3AnsWhqBgv8hcueIuiEwqJryPTQCqYb9D4mwqFG34=; b=CePKrkjPobPEdPqiN5hmvAqEC/ xBealDSNZCe8XGXaCfg1KNtwROYfZlL6tKoOhtOEMCPNarCNktww51fEfXJHyDBHk6rhNfM6rv3RK wrH42P8Y2VmExmlEEnF8QJ1eAf0g1ASKOuvEeA/NWSJBd6ETz2Io++qMINpWVS35BonjyuO7B3O+S LlP4QCq9K7lcldbyVLiFgfWHdWXeC7srN5uXbSec9zHgqU5AaKjykTpA5nqdk0M4gQEcYDbwMOxl/ AEnhq1oEhwj562+iU3KuWTJAhGcoMHCpCvo6w68H2Ka89A7GPn9jkCCSDRF4UvKqsA2dSiLg7TutI +zKub+pw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tVSlY-00000007sYj-0fSw; Wed, 08 Jan 2025 09:54:20 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tVSZW-00000007puM-09ji; Wed, 08 Jan 2025 09:41:55 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id C6B785C2735; Wed, 8 Jan 2025 09:41:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0FF3EC4CEE0; Wed, 8 Jan 2025 09:41:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1736329312; bh=EntXp4xoflKbAqPs1HYoj7ukYN+nnJIPOzYENz4cHvA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ZmBJBt3ye5TWgQ2ebPu+INxrnEO7li5c1DTwrmISGqEEPqqEJbpeHBgfqe+0wxPYb l/sISxNY67Y+aQ85lTp78YdVXn7i3WjvUjRjOqIaVWyp9l42NN2lnJGlJX6LSwbHkP FKRQq/N4Gg6pE0NgXR9vPAi7cl9RuLQwKKR/kUOQeleLZ+8pNAYZLJTjci/2zlxh0G ajkzB8tcdSN9v7z5QOl6TlroM9nC4lhKTuD1F6hQeR/1d0oIYpuGHESFsCjseXxmtp dIcziBACMLrsq9c7A3mn6gHWqWohkKzW7L4WD8IiboSaDR1A8e8rqNGGMqsHFH5jwf zVwMC/GGy2BmQ== Date: Wed, 8 Jan 2025 10:41:49 +0100 From: Lorenzo Bianconi To: Bjorn Helgaas Cc: Ryder Lee , Jianjun Wang , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Manivannan Sadhasivam , Rob Herring , Bjorn Helgaas , Philipp Zabel , Matthias Brugger , AngeloGioacchino Del Regno , Michael Turquette , Stephen Boyd , linux-pci@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org Subject: Re: [PATCH v5 5/6] PCI: mediatek-gen3: Add reset delay in mtk_pcie_en7581_power_up() Message-ID: References: <20241130-pcie-en7581-fixes-v5-5-dbffe41566b3@kernel.org> <20250103183527.GA3959656@bhelgaas> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="UfOoG4Z6S4fyWZJw" Content-Disposition: inline In-Reply-To: <20250103183527.GA3959656@bhelgaas> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250108_014154_159777_6CC288D9 X-CRM114-Status: GOOD ( 26.00 ) 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 --UfOoG4Z6S4fyWZJw Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable >=20 > If you repost this series, here are a few comments/typos. Otherwise > we can do the trivial updates on the branch. >=20 > In subject: this patch doesn't *add* a delay; it *moves* it. ack, I will fix it. >=20 > On Sat, Nov 30, 2024 at 12:20:14AM +0100, Lorenzo Bianconi wrote: > > Airoha EN7581 has a hw bug asserting/releasing PCIE_PE_RSTB signal > > causing occasional PCIe link down issues. In order to overcome the > > problem, PCIe block is reset using REG_PCI_CONTROL (0x88) and > > REG_RESET_CONTROL (0x834) registers available in the clock module > > running clk_bulk_prepare_enable in mtk_pcie_en7581_power_up(). >=20 > Add parens after clk_bulk_prepare_enable. ack, I will fix it. >=20 > > In order to make the code more readable, move the wait for the time > > needed to complete the PCIe reset from en7581_pci_enable() to > > mtk_pcie_en7581_power_up(). > > Reduce reset timeout from 250ms to the standard PCIE_T_PVPERL_MS value > > (100ms) since it has no impact on the driver behavior. > > > > Reviewed-by: AngeloGioacchino Del Regno > > Acked-by: Stephen Boyd > > Reviewed-by: Manivannan Sadhasivam > > Signed-off-by: Lorenzo Bianconi > > --- > > drivers/clk/clk-en7523.c | 1 - > > drivers/pci/controller/pcie-mediatek-gen3.c | 7 +++++++ > > 2 files changed, 7 insertions(+), 1 deletion(-) > >=20 > > diff --git a/drivers/clk/clk-en7523.c b/drivers/clk/clk-en7523.c > > index 22fbea61c3dcc05e63f8fa37e203c62b2a6fe79e..bf9d9594bef8a54316e28e5= 6a1642ecb0562377a 100644 > > --- a/drivers/clk/clk-en7523.c > > +++ b/drivers/clk/clk-en7523.c > > @@ -393,7 +393,6 @@ static int en7581_pci_enable(struct clk_hw *hw) > > REG_PCI_CONTROL_PERSTOUT; > > val =3D readl(np_base + REG_PCI_CONTROL); > > writel(val | mask, np_base + REG_PCI_CONTROL); > > - msleep(250); > > =20 > > return 0; > > } > > diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/= controller/pcie-mediatek-gen3.c > > index 01e8fde96080fa55f6c23c7d1baab6e22c49fcff..da01e741ff290464d28e172= 879520dbe0670cc41 100644 > > --- a/drivers/pci/controller/pcie-mediatek-gen3.c > > +++ b/drivers/pci/controller/pcie-mediatek-gen3.c > > @@ -977,6 +977,13 @@ static int mtk_pcie_en7581_power_up(struct mtk_gen= 3_pcie *pcie) > > goto err_clk_prepare_enable; > > } > > =20 > > + /* > > + * Airoha EN7581 performs PCIe reset via clk callabacks since it has a > > + * hw issue with PCIE_PE_RSTB signal. Add wait for the time needed to > > + * complete the PCIe reset. >=20 > s/callabacks/callbacks/ ack, I will fix it. Regards, Lorenzo >=20 > > + */ > > + msleep(PCIE_T_PVPERL_MS); > > + > > return 0; > > =20 > > err_clk_prepare_enable: > >=20 > > --=20 > > 2.47.0 > >=20 --UfOoG4Z6S4fyWZJw Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTquNwa3Txd3rGGn7Y6cBh0uS2trAUCZ35IXQAKCRA6cBh0uS2t rNfuAP95qW2o5+5pMdA45lJJrd8AAwCrPov/N/UcDypJjjfnsQEAlJiNopVu7YmP HOKH4pXQZe272nswX6233GV357WPqwk= =k4Zn -----END PGP SIGNATURE----- --UfOoG4Z6S4fyWZJw--