From nobody Fri Dec 19 20:36:46 2025 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 C8D39C4332F for ; Wed, 16 Nov 2022 07:33:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232821AbiKPHdb (ORCPT ); Wed, 16 Nov 2022 02:33:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47984 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232501AbiKPHdI (ORCPT ); Wed, 16 Nov 2022 02:33:08 -0500 Received: from mail-wm1-x331.google.com (mail-wm1-x331.google.com [IPv6:2a00:1450:4864:20::331]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1FA2EF7 for ; Tue, 15 Nov 2022 23:33:07 -0800 (PST) Received: by mail-wm1-x331.google.com with SMTP id v7so11285866wmn.0 for ; Tue, 15 Nov 2022 23:33:07 -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=gJFKPZd2/ngSnq346SqU7Z9D7yjTYDLfGfb+BKnHqE0ILxyzuJ1txDg1MdlAT3sHXl oDwVZ7P61evzq63MIM600KiEJqOy/wjqkXbSvljzfpY0auAaNqgpe4LvUufn7QzhxUeL PWM32Lse3szgKTRnd5VTzN+uEDmrPbmWuL50h1mbS2Bn+nPpSsqn5FcCGUIjvLRGQrgT QUaI5HkPXBcfwAZvDmsy8EQdD2q7t9B7SL6jXCa5swYLQ0Zrk2Eq04LYFyBhGU4rwq1Y jxQ0PbXmJKtq7VsaUOiylKH9lL+OURq7kP5cLVkxMSp+OyUVpzyeAYEvhEB/amLMZOa1 xD5g== X-Gm-Message-State: ANoB5pnN6YfP6cb5RkvIHRQ8/XUr3mJ5qxSs4tSPFMWzCbY1syakr0ro 94ANVJ2yy9wqiFgo0pM8BSSOyg== 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 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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, }; =20 /** @@ -711,9 +713,37 @@ static void ipa_validate_build(void) =20 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 =3D of_property_read_bool(dev->of_node, "modem-init"); + ret =3D of_property_read_string(dev->of_node, "qcom,gsi-loader", &str); + + /* If the new property doesn't exist, it's legacy behavior */ + if (ret =3D=3D -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; =20 + /* 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) } =20 loader =3D ipa_firmware_loader(dev); + if (loader =3D=3D IPA_LOADER_INVALID) + return -EINVAL; if (loader =3D=3D IPA_LOADER_DEFER) return -EPROBE_DEFER; =20 @@ -834,20 +866,18 @@ static int ipa_probe(struct platform_device *pdev) =20 dev_info(dev, "IPA driver initialized"); =20 - /* 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 =3D=3D IPA_LOADER_MODEM) goto done; =20 - /* 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 =3D ipa_firmware_load(dev); if (ret) goto err_deconfig; =20 + /* GSI firmware is loaded; proceed to setup */ ret =3D ipa_setup(ipa); if (ret) goto err_deconfig; --=20 2.34.1