From patchwork Mon Nov 18 08:04:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 13878252 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 7277ED43FEC for ; Mon, 18 Nov 2024 08:11:07 +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=S+yQlc4R5M65vr5ZKFW+S2409HIUoh5Leye0oaP7cyg=; b=sVc2tPKKpJ6xeGOnwTyun4npX/ Fz50ZRaIfzVaLjEo4rZHgTgNIyyzntItiYgzc7KsKZEjUcFfvGtnK6tK+ZXvtuwn0CUIcJ5R2T0AV rjE+wNuCJeEn3h44D3s7JOxJ5E6k929ZG8uXuuQQEIdkS3b8iUy4O3L5hL67WmSecyK10kWApTsSU w7dUWghtrHW8kevjbiok+mA1bV+6k+BC7yzaPFk8z35axQ+PfMmDlBtfU84c6bMMdzurhCQm/JTZ8 pHfJZxS4NJHfaNXTc5BYnzPmNEutY2jpxaVmceEexYwf6Wn6247F+QxeUCzE/NgcfKPIY1isVxmv+ fNi8TdLg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tCwqg-00000008j1o-2MM4; Mon, 18 Nov 2024 08:11:06 +0000 Received: from nyc.source.kernel.org ([147.75.193.91]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tCwlM-00000008iES-2pB9; Mon, 18 Nov 2024 08:05:41 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 3E793A4180C; Mon, 18 Nov 2024 08:03:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 35667C4CECC; Mon, 18 Nov 2024 08:05:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731917135; bh=DhSJnQhwThCB5J0umXx/t8RzQXQNejO05g1shMYhbU4=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=e6hpPiY3kW6xbiu60te+uoUxs/sfDCh7sWjP/NPeEdoYRpNa1+/JPOjoeCEo202xu Y8C0gLgoGDfoi5hhxlX5h1LPgaS8KKpXN9cMhe+YyOp7bv0761UPhfMM4X2avsr67i h8nFkhJO4yXDhTi1g0uZwaeuiaE000y9qVLfEOhwc8KMREy+pzDfPe5qH8s0h1IEzb 87gkAnyl7wn+IjPYxg0NO0mNXRLOnc5Kb0tZZeIrAxnl8HbAH2JemtZc0IFPEkpYmu R/MGJASMi4lY8jHZtPjJvhiDcFzPs4zDYBXKaL0I8k0ZZUfcNqd4810ggZdK3pehoK k0/7BXsz+CBQA== From: Lorenzo Bianconi Date: Mon, 18 Nov 2024 09:04:57 +0100 Subject: [PATCH v4 5/6] PCI: mediatek-gen3: Add reset delay in mtk_pcie_en7581_power_up() MIME-Version: 1.0 Message-Id: <20241118-pcie-en7581-fixes-v4-5-24bb61703ad7@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_000536_861837_3429FB27 X-CRM114-Status: GOOD ( 12.65 ) X-BeenThere: linux-mediatek@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-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org 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(). 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 PCIE_T_PVPERL_MS (100ms). Reviewed-by: AngeloGioacchino Del Regno Signed-off-by: Lorenzo Bianconi Acked-by: Stephen Boyd Reviewed-by: Manivannan Sadhasivam --- drivers/clk/clk-en7523.c | 1 - drivers/pci/controller/pcie-mediatek-gen3.c | 7 +++++++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/clk/clk-en7523.c b/drivers/clk/clk-en7523.c index 22fbea61c3dcc05e63f8fa37e203c62b2a6fe79e..bf9d9594bef8a54316e28e56a1642ecb0562377a 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 = readl(np_base + REG_PCI_CONTROL); writel(val | mask, np_base + REG_PCI_CONTROL); - msleep(250); return 0; } diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c index e4f890a73cb8ada7423301fa7a9acc3e177d0cad..f47c0f2995d94ea99bf41146657bd90b87781a7c 100644 --- a/drivers/pci/controller/pcie-mediatek-gen3.c +++ b/drivers/pci/controller/pcie-mediatek-gen3.c @@ -980,6 +980,13 @@ static int mtk_pcie_en7581_power_up(struct mtk_gen3_pcie *pcie) goto err_clk_prepare_enable; } + /* + * 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. + */ + msleep(PCIE_T_PVPERL_MS); + return 0; err_clk_prepare_enable: