From patchwork Wed Nov 16 07:32:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Elder X-Patchwork-Id: 625641 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 32442C43217 for ; Wed, 16 Nov 2022 07:33:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232760AbiKPHd2 (ORCPT ); Wed, 16 Nov 2022 02:33:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48018 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232762AbiKPHdH (ORCPT ); Wed, 16 Nov 2022 02:33:07 -0500 Received: from mail-wm1-x334.google.com (mail-wm1-x334.google.com [IPv6:2a00:1450:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E6213BC37 for ; Tue, 15 Nov 2022 23:33:05 -0800 (PST) Received: by mail-wm1-x334.google.com with SMTP id o30so11280285wms.2 for ; Tue, 15 Nov 2022 23:33:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; 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=QmJK2z6YewxghveqGIb9UQBF6OMvTjY+OevUyUnH0xk=; b=AlwDnToVO2of7fWwUMmka1YavMRruNRrWzdBbvlUDfspCxIL90nNvyGeVYFxHCrwSa qiaS3T7X63l9vutvktkMzPsvV8+N7I0qVjejVbxzFPUn4sPaJ9OvXFZQf/3f/5Ln5k/J 27Ef6HD165TVua+NrERnzzR9+lFEZMrxkT+ZvGI5Ar3alJ/9KDz7dwt28z68oxuq6yex NjSkHgdlAHsHw0IWX+vT0UusfXj/zSydp4igAc+jsX7kHqFJvcBcfuPkR1jKh8G9IMZL uyl10CjRKz1Pwp714ZcObGaRQTsbaKt022qSs/ZqnPdqurS8vCUHEnKTzKUM61/2OolN 3GGw== 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=QmJK2z6YewxghveqGIb9UQBF6OMvTjY+OevUyUnH0xk=; b=u4nfbpLO9ZQ/NJLkbrqFm0gHujGJ/ZePcFCzqCa0aIYDKJKuuagaqjIy/qVghcBu54 WRQ0nGakkjNp4sqGKk7Zi1LZ9LtKqW79NQbGk4YOxjqV+zLMnC/WnD052enqK7mCHDS1 OVl98uLju+f2HycBmq8dAtgehUdvJTva3ouwIYtEr5DEdWdGLhEwfnQwQ5mrDTBqLdY+ 3tG4PGgrPyRix6R5YbFVUQcWkYPvziqz6VDO/qsZEqZpDXjmnM7eOsxg+nt3N9t5G1E8 q3oEaNHcQQgbvSOKJmOH4L740Fh60dFCZE/OhCsSfiU6HN+avu3Dcp7mKXbb7NANhu0r lQVg== X-Gm-Message-State: ANoB5pkEOc/GtKzHROJL69itlwUQDNNmgPYMOTNM4tS1AqV4uPSYJgmm 8ywYVY/Aia01GrIsirkUu+7V3Q== X-Google-Smtp-Source: AA0mqf62Ld8reiwgFoaddozR7mLXKWhrMlpi/Ugv0wlkVD+1Yr31Rmsy7IfPlu/JMX7DeFk05uwbXQ== X-Received: by 2002:a1c:e914:0:b0:3cf:d055:9138 with SMTP id q20-20020a1ce914000000b003cfd0559138mr1126362wmc.140.1668583985420; Tue, 15 Nov 2022 23:33:05 -0800 (PST) Received: from zoltan.localdomain ([167.98.215.174]) by smtp.gmail.com with ESMTPSA id g34-20020a05600c4ca200b003cfd4e6400csm1058823wmp.19.2022.11.15.23.33.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Nov 2022 23:33:04 -0800 (PST) From: Alex Elder To: robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: andersson@kernel.org, konrad.dybcio@linaro.org, agross@kernel.org, elder@kernel.org, linux-arm-msm@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next v3 3/5] net: ipa: introduce "qcom,gsi-loader" property Date: Wed, 16 Nov 2022 01:32:54 -0600 Message-Id: <20221116073257.34010-4-elder@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221116073257.34010-1-elder@linaro.org> References: <20221116073257.34010-1-elder@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Introduce a new way of specifying how the GSI firmware gets loaded for IPA. Currently, this is indicated by the presence or absence of the Boolean "modem-init" Device Tree property. The new property must have a value--either "self" or "modem"--which indicates whether the AP or modem is the GSI firmware loader, respectively. For legacy systems, the new property will not exist, and the "modem-init" property will be used. For newer systems, the "qcom,gsi-loader" property *must* exist, and must have one of the two prescribed values. It is an error to have both properties defined, and it is an error for the new property to have an unrecognized value. Signed-off-by: Alex Elder --- drivers/net/ipa/ipa_main.c | 44 ++++++++++++++++++++++++++++++++------ 1 file changed, 37 insertions(+), 7 deletions(-) diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c index 9e43b79d233e9..214e524dce795 100644 --- a/drivers/net/ipa/ipa_main.c +++ b/drivers/net/ipa/ipa_main.c @@ -87,11 +87,13 @@ * @IPA_LOADER_DEFER: System not ready; try again later * @IPA_LOADER_SELF: AP loads GSI firmware * @IPA_LOADER_MODEM: Modem loads GSI firmware, signals when done + * @IPA_LOADER_INVALID: GSI firmware loader specification is invalid */ enum ipa_firmware_loader { IPA_LOADER_DEFER, IPA_LOADER_SELF, IPA_LOADER_MODEM, + IPA_LOADER_INVALID, }; /** @@ -711,9 +713,37 @@ static void ipa_validate_build(void) static enum ipa_firmware_loader ipa_firmware_loader(struct device *dev) { - if (of_property_read_bool(dev->of_node, "modem-init")) + bool modem_init; + const char *str; + int ret; + + /* Look up the old and new properties by name */ + modem_init = of_property_read_bool(dev->of_node, "modem-init"); + ret = of_property_read_string(dev->of_node, "qcom,gsi-loader", &str); + + /* If the new property doesn't exist, it's legacy behavior */ + if (ret == -EINVAL) { + if (modem_init) + return IPA_LOADER_MODEM; + goto out_self; + } + + /* Any other error on the new property means it's poorly defined */ + if (ret) + return IPA_LOADER_INVALID; + + /* New property value exists; if old one does too, that's invalid */ + if (modem_init) + return IPA_LOADER_INVALID; + + /* Modem loads GSI firmware for "modem" */ + if (!strcmp(str, "modem")) return IPA_LOADER_MODEM; + /* Any value other than "self" is an error */ + if (strcmp(str, "self")) + return IPA_LOADER_INVALID; +out_self: /* We need Trust Zone to load firmware; make sure it's available */ if (qcom_scm_is_available()) return IPA_LOADER_SELF; @@ -773,6 +803,8 @@ static int ipa_probe(struct platform_device *pdev) } loader = ipa_firmware_loader(dev); + if (loader == IPA_LOADER_INVALID) + return -EINVAL; if (loader == IPA_LOADER_DEFER) return -EPROBE_DEFER; @@ -834,20 +866,18 @@ static int ipa_probe(struct platform_device *pdev) dev_info(dev, "IPA driver initialized"); - /* If the modem is doing early initialization, it will trigger a - * call to ipa_setup() when it has finished. In that case we're - * done here. + /* If the modem is loading GSI firmware, it will trigger a call to + * ipa_setup() when it has finished. In that case we're done here. */ if (loader == IPA_LOADER_MODEM) goto done; - /* Otherwise we need to load the firmware and have Trust Zone validate - * and install it. If that succeeds we can proceed with setup. - */ + /* The AP is loading GSI firmware; do so now */ ret = ipa_firmware_load(dev); if (ret) goto err_deconfig; + /* GSI firmware is loaded; proceed to setup */ ret = ipa_setup(ipa); if (ret) goto err_deconfig;