From nobody Sat Sep 21 09:51:39 2024 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 A77B2C54EBC for ; Thu, 5 Jan 2023 17:15:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235014AbjAERP3 (ORCPT ); Thu, 5 Jan 2023 12:15:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34286 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234975AbjAERO0 (ORCPT ); Thu, 5 Jan 2023 12:14:26 -0500 Received: from mail-wm1-x332.google.com (mail-wm1-x332.google.com [IPv6:2a00:1450:4864:20::332]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 198C467BEC for ; Thu, 5 Jan 2023 09:08:45 -0800 (PST) Received: by mail-wm1-x332.google.com with SMTP id ay2-20020a05600c1e0200b003d22e3e796dso1854930wmb.0 for ; Thu, 05 Jan 2023 09:08:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20210112.gappssmtp.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=sncxYiJ19EBEMYozwgCXbGEKSdQ2+11yxAIRrAVvyso=; b=L8GGi7ni7dl6wFN8IW77qB70367v8PhZ3Sd7+oJtMLY5Ej9cNvDNLQSAsDm09a+xsP wK3c5FXsCw2fAI8nS6woEXI0BA5uhEXQAs1+yNidpxEMs39ztajNLQMH9bjXgBm615vp 3UTrsw/syO8Q2MNa9PtePGoMM7ezHfYurfTCo5Ds8UGYdF/+rmD+F7wd79Y8dZwU7VSn B14ErNIeK6oq02bUfQPt0ZEJNesP1wNbvDsX2THshhyp5+nW2Par/RJXvy52WSR2YMq1 ZFJUeYixlF/HoXntuGwSv4jBB+damvcCP4cq//5M4DNqUB6jD+nSsg5nryz18+5IskYw fWLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=sncxYiJ19EBEMYozwgCXbGEKSdQ2+11yxAIRrAVvyso=; b=S53kgJI4ZQN1rqqNK4n/YdV5FlaWc/V9yH3w91msucvsRJ73rohba/7c5NMfkIHysz TqwKjE1bGBU4XBbTasnuCXNszyfozmyYsaV8x6rXeTrHUbpqVPA3nZ/xY76zRQTlpi+s 1Nl4/1szHUtn/LvqtFtGjTqR2soM6rSDCS4tVokJgOTdiwC7tr4VgBxrrsvZC+4yaLvm gUef+R2jr1K3h/h54S6p7D8UD8dx0IWMsu5bfOFVk/3tiTKcnHKpkpjmet+YysVHRQuK YsiRZIMoC5ahngFGD3nRmvkx4KeaQJxXcP+OCRph71EtT1w9TAWtfvbbz8PzUHssM5Er ZdiA== X-Gm-Message-State: AFqh2koxOxe6yqilv9c4aB7KH9FGhKqZCUD1ojzqSVppxLKhYaq8fcID BlrScrXJlsigkg64of5V3GH8hA== X-Google-Smtp-Source: AMrXdXsa25aMnGI1cayPOWzrjuYzyQhetcgmL1o5YukwOgaRADsQ2/BrQNcacZ4JwiA8kuPZNNtW5g== X-Received: by 2002:a1c:770b:0:b0:3cf:a18d:399c with SMTP id t11-20020a1c770b000000b003cfa18d399cmr39048182wmi.1.1672938474085; Thu, 05 Jan 2023 09:07:54 -0800 (PST) Received: from blmsp.fritz.box ([2001:4091:a245:805c:9cf4:fdb8:bb61:5f4e]) by smtp.gmail.com with ESMTPSA id f14-20020adfe90e000000b002365730eae8sm37164853wrm.55.2023.01.05.09.07.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Jan 2023 09:07:53 -0800 (PST) From: Markus Schneider-Pargmann To: Rob Herring , Krzysztof Kozlowski , Matthias Brugger Cc: Chun-Jie Chen , AngeloGioacchino Del Regno , Fabien Parent , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Alexandre Bailon , Fabien Parent , Markus Schneider-Pargmann Subject: [PATCH 7/8] soc: mediatek: Add support for MTK_SCPD_STRICT_BUS_PROTECTION cap Date: Thu, 5 Jan 2023 18:07:34 +0100 Message-Id: <20230105170735.1637416-8-msp@baylibre.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230105170735.1637416-1-msp@baylibre.com> References: <20230105170735.1637416-1-msp@baylibre.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Alexandre Bailon This adds support for MTK_SCPD_STRICT_BUS_PROTECTION capability. It is a strict bus protection policy that requires the bus protection to be disabled before accessing the bus. This is required by the mt8365, for the MM power domain. Signed-off-by: Alexandre Bailon Signed-off-by: Fabien Parent Signed-off-by: Markus Schneider-Pargmann --- Notes: Changes in v4: - Change name in title and commit message =20 Changes in v3: - Rename MTK_SCPD_STRICT_BUSP to MTK_SCPD_STRICT_BUS_PROTECTION - Remove extra bool variable reflecting the capability =20 Changes in v2: - Fixup error handling path. drivers/soc/mediatek/mtk-pm-domains.c | 27 +++++++++++++++++++++++---- drivers/soc/mediatek/mtk-pm-domains.h | 1 + 2 files changed, 24 insertions(+), 4 deletions(-) diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/m= tk-pm-domains.c index d53309f050ee..29a9028dd9b3 100644 --- a/drivers/soc/mediatek/mtk-pm-domains.c +++ b/drivers/soc/mediatek/mtk-pm-domains.c @@ -265,9 +265,17 @@ static int scpsys_power_on(struct generic_pm_domain *g= enpd) regmap_clear_bits(scpsys->base, pd->data->ctl_offs, PWR_ISO_BIT); regmap_set_bits(scpsys->base, pd->data->ctl_offs, PWR_RST_B_BIT); =20 - ret =3D clk_bulk_prepare_enable(pd->num_subsys_clks, pd->subsys_clks); - if (ret) - goto err_pwr_ack; + /* + * In few Mediatek platforms(e.g. MT6779), the bus protect policy is + * stricter, which leads to bus protect release must be prior to bus + * access. + */ + if (!MTK_SCPD_CAPS(pd, MTK_SCPD_STRICT_BUS_PROTECTION)) { + ret =3D clk_bulk_prepare_enable(pd->num_subsys_clks, + pd->subsys_clks); + if (ret) + goto err_pwr_ack; + } =20 ret =3D scpsys_sram_enable(pd); if (ret < 0) @@ -277,12 +285,23 @@ static int scpsys_power_on(struct generic_pm_domain *= genpd) if (ret < 0) goto err_disable_sram; =20 + if (MTK_SCPD_CAPS(pd, MTK_SCPD_STRICT_BUS_PROTECTION)) { + ret =3D clk_bulk_prepare_enable(pd->num_subsys_clks, + pd->subsys_clks); + if (ret) + goto err_enable_bus_protect; + } + return 0; =20 +err_enable_bus_protect: + scpsys_bus_protect_enable(pd); err_disable_sram: scpsys_sram_disable(pd); err_disable_subsys_clks: - clk_bulk_disable_unprepare(pd->num_subsys_clks, pd->subsys_clks); + if (!MTK_SCPD_CAPS(pd, MTK_SCPD_STRICT_BUS_PROTECTION)) + clk_bulk_disable_unprepare(pd->num_subsys_clks, + pd->subsys_clks); err_pwr_ack: clk_bulk_disable_unprepare(pd->num_clks, pd->clks); err_reg: diff --git a/drivers/soc/mediatek/mtk-pm-domains.h b/drivers/soc/mediatek/m= tk-pm-domains.h index 1fa634509db1..e5aa2348a9db 100644 --- a/drivers/soc/mediatek/mtk-pm-domains.h +++ b/drivers/soc/mediatek/mtk-pm-domains.h @@ -11,6 +11,7 @@ /* can't set MTK_SCPD_KEEP_DEFAULT_OFF at the same time */ #define MTK_SCPD_ALWAYS_ON BIT(5) #define MTK_SCPD_HAS_WAY_EN BIT(6) +#define MTK_SCPD_STRICT_BUS_PROTECTION BIT(7) #define MTK_SCPD_CAPS(_scpd, _x) ((_scpd)->data->caps & (_x)) =20 #define SPM_VDE_PWR_CON 0x0210 --=20 2.39.0