From patchwork Thu Dec 14 11:46:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudiu Beznea X-Patchwork-Id: 13492871 X-Patchwork-Delegate: geert@linux-m68k.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=tuxon.dev header.i=@tuxon.dev header.b="VH2cq5w1" Received: from mail-ed1-x529.google.com (mail-ed1-x529.google.com [IPv6:2a00:1450:4864:20::529]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A3C26171A for ; Thu, 14 Dec 2023 03:46:54 -0800 (PST) Received: by mail-ed1-x529.google.com with SMTP id 4fb4d7f45d1cf-54f4f7e88feso8845049a12.3 for ; Thu, 14 Dec 2023 03:46:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tuxon.dev; s=google; t=1702554413; x=1703159213; darn=vger.kernel.org; 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=AHdjbrsgC9c7zj7iW7XF4dehsvpJIxxX32noXPZIWvM=; b=VH2cq5w1BQ0Zbv/cNEd4CUZaRS8dyZjc4zE+W1wM4RqrCRVoR5xKR4uoz7hWqSGsHA DbhoR7p5hQ4v/uDaj0XiLwEjCI+im9ODDaJ9CSsxSGirOfFQ0IAYjV3OL3ZY1Xjv+W9V oM3GbU3NOcLAWVjdwTVD0bcLROXGqW4Ke5UpA5y5vTzeJR6EHc/tZ/kLz5yPMtPA+gP8 xmpv68vR2iJzUeXGGwRKynq1mn12XMVc3AAV2jA2BomxyfhUwe0LvvQYK+Ex311ELynx mErJJPbFEnscJrKgnWeDBblsz8C0BxMsYZj+M0bB8BsT4G8swO/IuypMyKS6H4pgQlD+ DtvQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702554413; x=1703159213; 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=AHdjbrsgC9c7zj7iW7XF4dehsvpJIxxX32noXPZIWvM=; b=FmrvzCUl90La4OOemIXvbcfGhuNC0NhHAEZuRMWdlrI5llLkhWKgW4mfRoLpH+xBKe 37+Nox+/HowjOjo+1Zb+w3GAerH2358qF/wpBZLfMUQW5A2VXpYKQoPieSjfKvhWKdir HuQ7gmf9dE7YQFEpQlhJ1wFPB9M0qLGnorLw7R8gS7quTqwFB73uZjDhipSDzZhlranz UG1YOh2qaGvDJbGcStY80WeE1IUDL9BAtV91JePtN+1ozQk+1UvftaA4UPHZvNgyVHzj IGZtzmIe09/kLsqzfSY4dQNXOGoHp4JLEn9/PspLdNQUnXoWBqFr4dAJrnLvCqiQqu5N b/7w== X-Gm-Message-State: AOJu0Yz2JUTTCTeZw3LEUU1V8TNunwkPDoFzyULlG/wACC1caql5tEFe gvSCtzqj8EG6WHf/NR46qy0Qjg== X-Google-Smtp-Source: AGHT+IFrFS+Z+MB4DKzhISgHNRoGJDDklWTn4/FS7HR5/yJpAYoiauOPD4XcVQ8K730XQ5ToztxooQ== X-Received: by 2002:a17:906:284:b0:a19:940f:b9d3 with SMTP id 4-20020a170906028400b00a19940fb9d3mr4327540ejf.25.1702554413073; Thu, 14 Dec 2023 03:46:53 -0800 (PST) Received: from claudiu-X670E-Pro-RS.. ([82.78.167.103]) by smtp.gmail.com with ESMTPSA id ll9-20020a170907190900b00a1da2f7c1d8sm9240877ejc.77.2023.12.14.03.46.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Dec 2023 03:46:52 -0800 (PST) From: Claudiu X-Google-Original-From: Claudiu To: s.shtylyov@omp.ru, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, richardcochran@gmail.com, p.zabel@pengutronix.de, yoshihiro.shimoda.uh@renesas.com, wsa+renesas@sang-engineering.com, geert+renesas@glider.be Cc: netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Claudiu Beznea Subject: [PATCH net-next v2 21/21] net: ravb: Add runtime PM support Date: Thu, 14 Dec 2023 13:46:00 +0200 Message-Id: <20231214114600.2451162-22-claudiu.beznea.uj@bp.renesas.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231214114600.2451162-1-claudiu.beznea.uj@bp.renesas.com> References: <20231214114600.2451162-1-claudiu.beznea.uj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-renesas-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Claudiu Beznea Add runtime PM support for the ravb driver. As the driver is used by different IP variants, with different behaviors, to be able to have the runtime PM support available for all devices, the preparatory commits moved all the resources parsing and allocations in the driver's probe function and kept the settings for ravb_open(). This is due to the fact that on some IP variants-platforms tuples disabling/enabling the clocks will switch the IP to the reset operation mode where registers' content is lost and reconfiguration needs to be done. For this the rabv_open() function enables the clocks, switches the IP to configuration mode, applies all the registers settings and switches the IP to the operational mode. At the end of ravb_open() IP is ready to send/receive data. In ravb_close() necessary reverts are done (compared with ravb_open()), the IP is switched to reset mode and clocks are disabled. The ethtool APIs or IOCTLs that might execute while the interface is down are either cached (and applied in ravb_open()) or rejected (as at that time the IP is in reset mode). Keeping the IP in the reset mode also increases the power saved (according to the hardware manual). Signed-off-by: Claudiu Beznea Reviewed-by: Sergey Shtylyov --- Changes in v2: - keep RPM support for all platforms drivers/net/ethernet/renesas/ravb_main.c | 47 ++++++++++++++++++++++-- 1 file changed, 44 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index 9ff943dff522..0733b63ff910 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -1839,16 +1839,21 @@ static int ravb_open(struct net_device *ndev) { struct ravb_private *priv = netdev_priv(ndev); const struct ravb_hw_info *info = priv->info; + struct device *dev = &priv->pdev->dev; int error; napi_enable(&priv->napi[RAVB_BE]); if (info->nc_queues) napi_enable(&priv->napi[RAVB_NC]); + error = pm_runtime_resume_and_get(dev); + if (error < 0) + goto out_napi_off; + /* Set AVB config mode */ error = ravb_set_config_mode(ndev); if (error) - goto out_napi_off; + goto out_rpm_put; ravb_set_delay_mode(ndev); ravb_write(ndev, priv->desc_bat_dma, DBAT); @@ -1894,6 +1899,9 @@ static int ravb_open(struct net_device *ndev) ravb_stop_dma(ndev); out_set_reset: ravb_set_reset_mode(ndev); +out_rpm_put: + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); out_napi_off: if (info->nc_queues) napi_disable(&priv->napi[RAVB_NC]); @@ -2189,6 +2197,7 @@ static int ravb_close(struct net_device *ndev) struct ravb_private *priv = netdev_priv(ndev); const struct ravb_hw_info *info = priv->info; struct ravb_tstamp_skb *ts_skb, *ts_skb2; + struct device *dev = &priv->pdev->dev; netif_tx_stop_all_queues(ndev); @@ -2237,6 +2246,9 @@ static int ravb_close(struct net_device *ndev) /* Set reset mode. */ ravb_set_reset_mode(ndev); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + return 0; } @@ -2808,6 +2820,8 @@ static int ravb_probe(struct platform_device *pdev) clk_prepare(priv->refclk); platform_set_drvdata(pdev, ndev); + pm_runtime_set_autosuspend_delay(&pdev->dev, 100); + pm_runtime_use_autosuspend(&pdev->dev); pm_runtime_enable(&pdev->dev); error = pm_runtime_resume_and_get(&pdev->dev); if (error < 0) @@ -2916,6 +2930,9 @@ static int ravb_probe(struct platform_device *pdev) netdev_info(ndev, "Base address at %#x, %pM, IRQ %d.\n", (u32)ndev->base_addr, ndev->dev_addr, ndev->irq); + pm_runtime_mark_last_busy(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); + return 0; out_netdev_unregister: @@ -2934,6 +2951,7 @@ static int ravb_probe(struct platform_device *pdev) pm_runtime_put(&pdev->dev); out_rpm_disable: pm_runtime_disable(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); clk_unprepare(priv->refclk); out_reset_assert: reset_control_assert(rstc); @@ -2947,6 +2965,12 @@ static void ravb_remove(struct platform_device *pdev) struct net_device *ndev = platform_get_drvdata(pdev); struct ravb_private *priv = netdev_priv(ndev); const struct ravb_hw_info *info = priv->info; + struct device *dev = &priv->pdev->dev; + int error; + + error = pm_runtime_resume_and_get(dev); + if (error < 0) + return; unregister_netdev(ndev); if (info->nc_queues) @@ -2958,8 +2982,9 @@ static void ravb_remove(struct platform_device *pdev) dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat, priv->desc_bat_dma); - pm_runtime_put_sync(&pdev->dev); + pm_runtime_put_sync_suspend(&pdev->dev); pm_runtime_disable(&pdev->dev); + pm_runtime_dont_use_autosuspend(dev); clk_unprepare(priv->refclk); reset_control_assert(priv->rstc); free_netdev(ndev); @@ -3041,6 +3066,10 @@ static int ravb_suspend(struct device *dev) if (ret) return ret; + ret = pm_runtime_force_suspend(&priv->pdev->dev); + if (ret) + return ret; + reset_assert: return reset_control_assert(priv->rstc); } @@ -3063,16 +3092,28 @@ static int ravb_resume(struct device *dev) ret = ravb_wol_restore(ndev); if (ret) return ret; + } else { + ret = pm_runtime_force_resume(dev); + if (ret) + return ret; } /* Reopening the interface will restore the device to the working state. */ ret = ravb_open(ndev); if (ret < 0) - return ret; + goto out_rpm_put; ravb_set_rx_mode(ndev); netif_device_attach(ndev); + return 0; + +out_rpm_put: + if (!priv->wol_enabled) { + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + } + return ret; }