From patchwork Wed Apr 13 14:48:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Elder X-Patchwork-Id: 561192 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 91DD0C433FE for ; Wed, 13 Apr 2022 14:48:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236127AbiDMOul (ORCPT ); Wed, 13 Apr 2022 10:50:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40258 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229891AbiDMOul (ORCPT ); Wed, 13 Apr 2022 10:50:41 -0400 Received: from mail-io1-xd2c.google.com (mail-io1-xd2c.google.com [IPv6:2607:f8b0:4864:20::d2c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CD24E63BF0 for ; Wed, 13 Apr 2022 07:48:19 -0700 (PDT) Received: by mail-io1-xd2c.google.com with SMTP id p21so2147637ioj.4 for ; Wed, 13 Apr 2022 07:48:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=X5sSdpjUHCfybVwprx6qx71sk3MsE1l8j38zhRYOgvA=; b=LmwOZ9RxrDn0V6KLyIvhi4GfqdnQ4v5IahSBu2X92eHXl4Ai65YlU+6EkOilLbjXkG 9jRnY+oe+uql7tubFiAZdeftpc/VHifxyy/3bx1Yt+n3A4v4z9p3MqQpnlMEgMtEoJdP +XGMptIn/3cVyGLX+23Jl0FR9byx836xJ8Nxv/0v20Dfl9sYiZKtdtkSDIVCJG3oDXjs xvn1ez+vFkp5f6TRJiBczQrn527bwLbgHwZdYq4TFBaJm5ljpEa3VzD6/KhhYaL15Jgx ZA//BnMb5XpVBSdo6QQyPsYTqJiTzn9b9qNbFEUhvHGvyBaxbbr5r2o3xQ3oDS+L7w06 Bpyw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=X5sSdpjUHCfybVwprx6qx71sk3MsE1l8j38zhRYOgvA=; b=IFdBu2UtDAVLMgmasqAKB6zKLwR4d//wnS+TgmhRXa5uayVdtdDbGpzujtpwH5hBxB JDXV1oPvCt0ETZBf7NX+YQxJkxZmfGxQx5mXubzr/Jn/R22iZ2i2sGHQWaL7ZnigQWCU QwsUmH7H0aAOf59zfr3fnHRhyCacHlokjDQqbCSu53t4+ia0BLT76iA0reO0ndghJxqp sfSpjSHhaUvPci6RJ8RbNYyio2je1sjyRd8QpmemUJzNt1lqG3gASk8k1IiMqf2wNc7t yfcEJLy1XOOaC8QTbvkxVteBHDMoAJ8xyQJU1jrS0uHR9gdqW5zCEDM8BbvPl/EmahQv FOQw== X-Gm-Message-State: AOAM531/0tIhWerWuRETmg96zch+UXXVusH8TPolO0Lp/z1cawWc4kNX XDRAT2W+jaFHkgX9RfIF9ibUPxjZYcGf1A== X-Google-Smtp-Source: ABdhPJxpAGG0zohJ+3BFEfkvsyd4fX292L+LzDb6aZkn52SWhHkhtWORE52Z9CUjr41R7UZFEswahg== X-Received: by 2002:a05:6638:110d:b0:326:541a:ef7c with SMTP id n13-20020a056638110d00b00326541aef7cmr3299678jal.208.1649861298876; Wed, 13 Apr 2022 07:48:18 -0700 (PDT) Received: from presto.localdomain (c-73-185-129-58.hsd1.mn.comcast.net. [73.185.129.58]) by smtp.gmail.com with ESMTPSA id u15-20020a056e021a4f00b002c665afb993sm108381ilv.11.2022.04.13.07.48.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Apr 2022 07:48:18 -0700 (PDT) From: Alex Elder To: stable@vger.kernel.org Cc: kuba@kernel.org, clew@codeaurora.org, deesin@codeaurora.org, swboyd@chromium.org, bjorn.andersson@linaro.org, elder@kernel.org, gregkh@linuxfoundation.org Subject: [PATCH 3/3] net: ipa: request IPA register values be retained Date: Wed, 13 Apr 2022 09:48:11 -0500 Message-Id: <20220413144811.522143-4-elder@linaro.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220413144811.522143-1-elder@linaro.org> References: <20220413144811.522143-1-elder@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org commit 34a081761e4e3c35381cbfad609ebae2962fe2f8 upstream. In some cases, the IPA hardware needs to request the always-on subsystem (AOSS) to coordinate with the IPA microcontroller to retain IPA register values at power collapse. This is done by issuing a QMP request to the AOSS microcontroller. A similar request ondoes that request. We must get and hold the "QMP" handle early, because we might get back EPROBE_DEFER for that. But the actual request should be sent while we know the IPA clock is active, and when we know the microcontroller is operational. Fixes: 1aac309d3207 ("net: ipa: use autosuspend") Signed-off-by: Alex Elder Signed-off-by: Jakub Kicinski --- drivers/net/ipa/ipa_power.c | 52 +++++++++++++++++++++++++++++++++++++ drivers/net/ipa/ipa_power.h | 7 +++++ drivers/net/ipa/ipa_uc.c | 5 ++++ 3 files changed, 64 insertions(+) diff --git a/drivers/net/ipa/ipa_power.c b/drivers/net/ipa/ipa_power.c index b1c6c0fcb654f..f2989aac47a62 100644 --- a/drivers/net/ipa/ipa_power.c +++ b/drivers/net/ipa/ipa_power.c @@ -11,6 +11,8 @@ #include #include +#include "linux/soc/qcom/qcom_aoss.h" + #include "ipa.h" #include "ipa_power.h" #include "ipa_endpoint.h" @@ -64,6 +66,7 @@ enum ipa_power_flag { * struct ipa_power - IPA power management information * @dev: IPA device pointer * @core: IPA core clock + * @qmp: QMP handle for AOSS communication * @spinlock: Protects modem TX queue enable/disable * @flags: Boolean state flags * @interconnect_count: Number of elements in interconnect[] @@ -72,6 +75,7 @@ enum ipa_power_flag { struct ipa_power { struct device *dev; struct clk *core; + struct qmp *qmp; spinlock_t spinlock; /* used with STOPPED/STARTED power flags */ DECLARE_BITMAP(flags, IPA_POWER_FLAG_COUNT); u32 interconnect_count; @@ -382,6 +386,47 @@ void ipa_power_modem_queue_active(struct ipa *ipa) clear_bit(IPA_POWER_FLAG_STARTED, ipa->power->flags); } +static int ipa_power_retention_init(struct ipa_power *power) +{ + struct qmp *qmp = qmp_get(power->dev); + + if (IS_ERR(qmp)) { + if (PTR_ERR(qmp) == -EPROBE_DEFER) + return -EPROBE_DEFER; + + /* We assume any other error means it's not defined/needed */ + qmp = NULL; + } + power->qmp = qmp; + + return 0; +} + +static void ipa_power_retention_exit(struct ipa_power *power) +{ + qmp_put(power->qmp); + power->qmp = NULL; +} + +/* Control register retention on power collapse */ +void ipa_power_retention(struct ipa *ipa, bool enable) +{ + static const char fmt[] = "{ class: bcm, res: ipa_pc, val: %c }"; + struct ipa_power *power = ipa->power; + char buf[36]; /* Exactly enough for fmt[]; size a multiple of 4 */ + int ret; + + if (!power->qmp) + return; /* Not needed on this platform */ + + (void)snprintf(buf, sizeof(buf), fmt, enable ? '1' : '0'); + + ret = qmp_send(power->qmp, buf, sizeof(buf)); + if (ret) + dev_err(power->dev, "error %d sending QMP %sable request\n", + ret, enable ? "en" : "dis"); +} + int ipa_power_setup(struct ipa *ipa) { int ret; @@ -438,12 +483,18 @@ ipa_power_init(struct device *dev, const struct ipa_power_data *data) if (ret) goto err_kfree; + ret = ipa_power_retention_init(power); + if (ret) + goto err_interconnect_exit; + pm_runtime_set_autosuspend_delay(dev, IPA_AUTOSUSPEND_DELAY); pm_runtime_use_autosuspend(dev); pm_runtime_enable(dev); return power; +err_interconnect_exit: + ipa_interconnect_exit(power); err_kfree: kfree(power); err_clk_put: @@ -460,6 +511,7 @@ void ipa_power_exit(struct ipa_power *power) pm_runtime_disable(dev); pm_runtime_dont_use_autosuspend(dev); + ipa_power_retention_exit(power); ipa_interconnect_exit(power); kfree(power); clk_put(clk); diff --git a/drivers/net/ipa/ipa_power.h b/drivers/net/ipa/ipa_power.h index 2151805d7fbb0..6f84f057a2095 100644 --- a/drivers/net/ipa/ipa_power.h +++ b/drivers/net/ipa/ipa_power.h @@ -40,6 +40,13 @@ void ipa_power_modem_queue_wake(struct ipa *ipa); */ void ipa_power_modem_queue_active(struct ipa *ipa); +/** + * ipa_power_retention() - Control register retention on power collapse + * @ipa: IPA pointer + * @enable: Whether retention should be enabled or disabled + */ +void ipa_power_retention(struct ipa *ipa, bool enable); + /** * ipa_power_setup() - Set up IPA power management * @ipa: IPA pointer diff --git a/drivers/net/ipa/ipa_uc.c b/drivers/net/ipa/ipa_uc.c index 856e55a080a7f..fe11910518d95 100644 --- a/drivers/net/ipa/ipa_uc.c +++ b/drivers/net/ipa/ipa_uc.c @@ -11,6 +11,7 @@ #include "ipa.h" #include "ipa_uc.h" +#include "ipa_power.h" /** * DOC: The IPA embedded microcontroller @@ -154,6 +155,7 @@ static void ipa_uc_response_hdlr(struct ipa *ipa, enum ipa_irq_id irq_id) case IPA_UC_RESPONSE_INIT_COMPLETED: if (ipa->uc_powered) { ipa->uc_loaded = true; + ipa_power_retention(ipa, true); pm_runtime_mark_last_busy(dev); (void)pm_runtime_put_autosuspend(dev); ipa->uc_powered = false; @@ -184,6 +186,9 @@ void ipa_uc_deconfig(struct ipa *ipa) ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_UC_1); ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_UC_0); + if (ipa->uc_loaded) + ipa_power_retention(ipa, false); + if (!ipa->uc_powered) return;