From patchwork Tue Sep 12 09:17:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Victor Shih X-Patchwork-Id: 722920 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7DE06CA0EC3 for ; Tue, 12 Sep 2023 09:17:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230225AbjILJRW (ORCPT ); Tue, 12 Sep 2023 05:17:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37026 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229509AbjILJRW (ORCPT ); Tue, 12 Sep 2023 05:17:22 -0400 Received: from mail-pf1-x430.google.com (mail-pf1-x430.google.com [IPv6:2607:f8b0:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 362DAA9; Tue, 12 Sep 2023 02:17:18 -0700 (PDT) Received: by mail-pf1-x430.google.com with SMTP id d2e1a72fcca58-68fbb10dea4so1649315b3a.3; Tue, 12 Sep 2023 02:17:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1694510237; x=1695115037; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=owu+iw/2FkUrRYrZDkX+J602qOAcIdeb4iAQuIcFb/M=; b=blxTRj4oK1E/xG/KC2l0mWgEeBMaxnpHIPMUbhoUzxGTekbyDM5NZ9N/Y/L9QoPT3C Y7spyiTvr9AiHVVG0ZNOw0MO3s0ZLUemGwE3gQrgPuJ1RIpS90Swz5tBbVsfrW+PdL0a kHPlka9J/GBc3tYfKPVlQdDCV1eJSq9RcoxiWRoAth1nWAxkndFQ66DysgGrrCfX/bDm K1//tH1ZcWrpNUCcx3C3HxwtDxRSWwx33sN9JFjH858lrcsoUYnjsUXt8PBTl8O/Y20R VUmOzxmH76yrGFAHrd+fNJaruwvb55WvkSuaRJw7LYKvir9UyjFvt7nnJ/TyLdycm+q1 YnWA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694510237; x=1695115037; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=owu+iw/2FkUrRYrZDkX+J602qOAcIdeb4iAQuIcFb/M=; b=pn0hU1zkD8oYy9nE0HFbLqe3rlMPEtH69gz1npBlfean3rC7hky+N6c6F8XJ4bLZUV m+lxVXD0/5roHeoyb/mEZknHUKQQxVgS2y9FdVAgS4mWRYXTm1vLU+8kDo2fRT0PhIOC oKGq6+aIWdtMASy0MATj4J7iD+w4wh5eDOMWKD5nASu2/E2q9/pRTEe3CvvMEp9UbXGZ 4BjNqWREDkhQmjds2dy61pL8munDlsVu4zcuOK2BOKwP2LKOOqbbRa9Jd6dV9+wIco3Q 8vovSSV2IYG2Oz2Ku7EYRpqQC5xv+BH5vDDvfVYsYyOfIEQkeGMirLJSe0hrel8ydgNP hmDw== X-Gm-Message-State: AOJu0YycX/dcFTYziv8Xm57BBJIsbnUMmo4WATG3QoZiyke+7Q6xs5ZV JdGEudmKf6o+EKdME+gK2BQ= X-Google-Smtp-Source: AGHT+IGqXNDHKApQE1bCCD8nNs98zTt/9xRUjd40elC0JNPe6ofIn7CyEUKrWqEeqzUgxUAAINQ11A== X-Received: by 2002:a05:6a20:3d82:b0:13d:bf07:7444 with SMTP id s2-20020a056a203d8200b0013dbf077444mr12497353pzi.0.1694510237473; Tue, 12 Sep 2023 02:17:17 -0700 (PDT) Received: from localhost.localdomain (2001-b400-e3a1-00a4-e9b8-a113-90c8-ebfb.emome-ip6.hinet.net. [2001:b400:e3a1:a4:e9b8:a113:90c8:ebfb]) by smtp.gmail.com with ESMTPSA id fa5-20020a056a002d0500b0068fb5e44827sm4186555pfb.67.2023.09.12.02.17.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Sep 2023 02:17:17 -0700 (PDT) From: Victor Shih To: ulf.hansson@linaro.org, adrian.hunter@intel.com Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, benchuanggli@gmail.com, HL.Liu@genesyslogic.com.tw, Greg.tu@genesyslogic.com.tw, liukun11@huaqin.com, Victor Shih , Victor Shih Subject: [PATCH V1] mmc: sdhci-pci-gli: A workaround to allow GL9750 to enter ASPM L1.2 Date: Tue, 12 Sep 2023 17:17:10 +0800 Message-Id: <20230912091710.7797-1-victorshihgli@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org From: Victor Shih When GL9750 enters ASPM L1 sub-states, it will stay at L1.1 and will not enter L1.2. The workaround is to toggle PM state to allow GL9750 to enter ASPM L1.2. Signed-off-by: Victor Shih --- drivers/mmc/host/sdhci-pci-gli.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c index ae8c307b7aa7..dd6f09024f08 100644 --- a/drivers/mmc/host/sdhci-pci-gli.c +++ b/drivers/mmc/host/sdhci-pci-gli.c @@ -25,6 +25,9 @@ #define GLI_9750_WT_EN_ON 0x1 #define GLI_9750_WT_EN_OFF 0x0 +#define PCI_GLI_9750_PM_CTRL 0xFC +#define PCI_GLI_9750_PM_STATE GENMASK(1, 0) + #define SDHCI_GLI_9750_CFG2 0x848 #define SDHCI_GLI_9750_CFG2_L1DLY GENMASK(28, 24) #define GLI_9750_CFG2_L1DLY_VALUE 0x1F @@ -536,8 +539,12 @@ static void sdhci_gl9750_set_clock(struct sdhci_host *host, unsigned int clock) static void gl9750_hw_setting(struct sdhci_host *host) { + struct sdhci_pci_slot *slot = sdhci_priv(host); + struct pci_dev *pdev; u32 value; + pdev = slot->chip->pdev; + gl9750_wt_on(host); value = sdhci_readl(host, SDHCI_GLI_9750_CFG2); @@ -547,6 +554,13 @@ static void gl9750_hw_setting(struct sdhci_host *host) GLI_9750_CFG2_L1DLY_VALUE); sdhci_writel(host, value, SDHCI_GLI_9750_CFG2); + /* toggle PM state to allow GL9750 to enter ASPM L1.2 */ + pci_read_config_dword(pdev, PCI_GLI_9750_PM_CTRL, &value); + value |= PCI_GLI_9750_PM_STATE; + pci_write_config_dword(pdev, PCI_GLI_9750_PM_CTRL, value); + value &= ~PCI_GLI_9750_PM_STATE; + pci_write_config_dword(pdev, PCI_GLI_9750_PM_CTRL, value); + gl9750_wt_off(host); }