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[147.75.199.223]) by mx.google.com with ESMTPS id b11-20020a05620a126b00b0077f0aef8580si18044757qkl.335.2023.12.28.22.54.42 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Dec 2023 22:54:43 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-12961-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel+bounces-12961-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) smtp.mailfrom="linux-kernel+bounces-12961-ouuuleilei=gmail.com@vger.kernel.org" Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ny.mirrors.kernel.org (Postfix) with ESMTPS id 8D7811C20E0E for ; Fri, 29 Dec 2023 06:54:42 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id B08C26FCE; Fri, 29 Dec 2023 06:54:29 +0000 (UTC) X-Original-To: linux-kernel@vger.kernel.org Received: from ex01.ufhost.com (ex01.ufhost.com [61.152.239.75]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2DBA15669 for ; Fri, 29 Dec 2023 06:54:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=starfivetech.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=starfivetech.com Received: from EXMBX165.cuchost.com (unknown [175.102.18.54]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "EXMBX165", Issuer "EXMBX165" (not verified)) by ex01.ufhost.com (Postfix) with ESMTP id BE36824E03E; Fri, 29 Dec 2023 14:54:21 +0800 (CST) Received: from EXMBX066.cuchost.com (172.16.7.66) by EXMBX165.cuchost.com (172.16.6.75) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Fri, 29 Dec 2023 14:54:21 +0800 Received: from jsia-virtual-machine.localdomain (175.136.135.142) by EXMBX066.cuchost.com (172.16.6.66) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Fri, 29 Dec 2023 14:54:17 +0800 From: Sia Jee Heng To: , CC: , , , , , , , Subject: [RFC v1 1/1] RISC-V: ACPI: Enable SPCR table for console output on RISC-V Date: Fri, 29 Dec 2023 14:54:05 +0800 Message-ID: <20231229065405.235625-2-jeeheng.sia@starfivetech.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231229065405.235625-1-jeeheng.sia@starfivetech.com> References: <20231229065405.235625-1-jeeheng.sia@starfivetech.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: EXCAS066.cuchost.com (172.16.6.26) To EXMBX066.cuchost.com (172.16.6.66) X-YovoleRuleAgent: yovoleflag X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1786598269075785340 X-GMAIL-MSGID: 1786598269075785340 The ACPI SPCR code has been used to enable console output for ARM64 and X86. The same code can be reused for RISC-V. Vendor will enable/disable the SPCR table in the firmware based on the platform design. However, in cases where the SPCR table is not usable, a kernel parameter could be used to specify the preferred console. Signed-off-by: Sia Jee Heng --- arch/riscv/kernel/acpi.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/riscv/kernel/acpi.c b/arch/riscv/kernel/acpi.c index e619edc8b0cc..5ec2fdf9e09f 100644 --- a/arch/riscv/kernel/acpi.c +++ b/arch/riscv/kernel/acpi.c @@ -18,6 +18,7 @@ #include #include #include +#include int acpi_noirq = 1; /* skip ACPI IRQ initialization */ int acpi_disabled = 1; @@ -151,6 +152,9 @@ void __init acpi_boot_table_init(void) if (!param_acpi_force) disable_acpi(); } + + if (!acpi_disabled) + acpi_parse_spcr(earlycon_acpi_spcr_enable, true); } static int acpi_parse_madt_rintc(union acpi_subtable_headers *header, const unsigned long end)