From patchwork Sat Feb 19 21:53:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Drew Fustini X-Patchwork-Id: 544348 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 A84B7C43217 for ; Sat, 19 Feb 2022 21:56:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243232AbiBSV4R (ORCPT ); Sat, 19 Feb 2022 16:56:17 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:55388 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243237AbiBSV4P (ORCPT ); Sat, 19 Feb 2022 16:56:15 -0500 Received: from mail-pj1-x1034.google.com (mail-pj1-x1034.google.com [IPv6:2607:f8b0:4864:20::1034]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 92B0754199 for ; Sat, 19 Feb 2022 13:55:54 -0800 (PST) Received: by mail-pj1-x1034.google.com with SMTP id v4so11570292pjh.2 for ; Sat, 19 Feb 2022 13:55:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ALItf1cmaYde5anKiXpaOkvR8+mXdj6IXy5l9T74CXY=; b=Fn3Ru8rk2m6UM8OQLbL67IIZ8/ISkk5RdEHaoDTmx+kgG1d3LaSWDLlgU5hpIz1l7O J7wJiWswQe2eiNiH9NK+KlcuyYwX5V/xk9AHURcL6gvv2KVTbN0ZXmOqjFP+Ymae+m6A XsyBw4215bt3cTNo+f3XJ9PD+lGYKgdRNXJuv4eDuVCSb1Kd3aWbB/DRxrG1zuO6qOK6 bmbXgCSMop4xAHAEGWRHJpJPJUIw19GqTB9pqV/e0IkSqhlP2Oz0sYn9UK88VS0LbwQK NDpXPd0nK3sJsBc29nP85v40SbCnUAjXVZumbtGJ7Ffb2doMS7kbn7u00qZ8C4AP5K39 rWYg== 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=ALItf1cmaYde5anKiXpaOkvR8+mXdj6IXy5l9T74CXY=; b=vGm37BOBjxpYwWEHFSRExwS3gQczV86tXDahrYgPwiTpzaP5lQG1kZ+8FZWh3CGDtG azm2EPQI57Q485D0OHKF57iTfJ4IiUGL0sinF8Sdlq9uaULcMHVhEHNn9oS758R0smQ2 c0v6N9GRqCLgU7t3kRzH1WZ4M9/miaDkiUA3O/HMduFPHkL4n2XL5xGyelPBtQ43URNq PAFrQTIVi8udRZtgkkEC8L1LVaydGJP5P/Jr6KmNKqdV+gMIr77DufC4yc9baTakWNN3 smznTmrK9epFG2pHAURE6Q8W5jnQ8m/kyy6WQ706BoJOFoWe52oodrXDuA7+6I8t8Fo5 CNfw== X-Gm-Message-State: AOAM532MmADrpPbH393Dwq28n/6nGbxbbtzAKTxWqbYFi3RAAEVEOK2z Z2II0TURX2zGH3gKO880EW7Vpg== X-Google-Smtp-Source: ABdhPJxMLUiSjR9mcVV1iK9+hG/lKSlGmCHqWar1s22AM6LNq/uC41pK9n3kfEId/9Rjt1hG8v3Asg== X-Received: by 2002:a17:902:ba96:b0:14c:8407:8e4b with SMTP id k22-20020a170902ba9600b0014c84078e4bmr12646881pls.135.1645307754101; Sat, 19 Feb 2022 13:55:54 -0800 (PST) Received: from x1.hsd1.or.comcast.net ([2601:1c2:1001:7090:31ab:1e81:9550:f30a]) by smtp.gmail.com with ESMTPSA id i17sm13447337pgn.82.2022.02.19.13.55.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 19 Feb 2022 13:55:53 -0800 (PST) From: Drew Fustini To: =?utf-8?q?Beno=C3=AEt_Cousson?= , Bjorn Andersson , Dave Gerlach , devicetree@vger.kernel.org, Drew Fustini , Keerthy , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-remoteproc@vger.kernel.org, Mathieu Poirier , Nishanth Menon , Rob Herring , Santosh Shilimkar , Tony Lindgren , s-anna@ti.com, khilman@baylibre.com Cc: Brad Griffis Subject: [PATCH 11/11] soc: ti: wkup_m3_ipc: Add debug option to halt m3 in suspend Date: Sat, 19 Feb 2022 13:53:28 -0800 Message-Id: <20220219215328.485660-12-dfustini@baylibre.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220219215328.485660-1-dfustini@baylibre.com> References: <20220219215328.485660-1-dfustini@baylibre.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From: Dave Gerlach Add a debugfs option to allow configurable halting of the wkup_m3 during suspend at the last possible point before low power mode entry. This condition can only be resolved through JTAG and advancing beyond the while loop in a8_lp_ds0_handler. Although this hangs the system it forces the system to remain active once it has been entirely configured for low power mode entry, allowing for register inspection through JTAG to help in debugging transition errors. Halt mode can be set using the enable_off_mode entry under wkup_m3_ipc in the debugfs. Suggested-by: Brad Griffis Signed-off-by: Dave Gerlach [dfustini: resolve trivial line conflicts] Signed-off-by: Drew Fustini --- drivers/soc/ti/wkup_m3_ipc.c | 78 +++++++++++++++++++++++++++++++++++- include/linux/wkup_m3_ipc.h | 2 + 2 files changed, 79 insertions(+), 1 deletion(-) diff --git a/drivers/soc/ti/wkup_m3_ipc.c b/drivers/soc/ti/wkup_m3_ipc.c index 5a1722c3bf1a..244bce3f52e8 100644 --- a/drivers/soc/ti/wkup_m3_ipc.c +++ b/drivers/soc/ti/wkup_m3_ipc.c @@ -7,6 +7,7 @@ * Dave Gerlach */ +#include #include #include #include @@ -50,6 +51,9 @@ #define IPC_IO_ISOLATION_STAT_SHIFT (10) #define IPC_IO_ISOLATION_STAT_MASK (0x1 << 10) +#define IPC_DBG_HALT_SHIFT (11) +#define IPC_DBG_HALT_MASK (0x1 << 11) + #define M3_STATE_UNKNOWN 0 #define M3_STATE_RESET 1 #define M3_STATE_INITED 2 @@ -137,6 +141,73 @@ static void wkup_m3_scale_data_fw_cb(const struct firmware *fw, void *context) release_firmware(fw); }; +#ifdef CONFIG_DEBUG_FS +static void wkup_m3_set_halt_late(bool enabled) +{ + if (enabled) + m3_ipc_state->halt = (1 << IPC_DBG_HALT_SHIFT); + else + m3_ipc_state->halt = 0; +} + +static int option_get(void *data, u64 *val) +{ + u32 *option = data; + + *val = *option; + + return 0; +} + +static int option_set(void *data, u64 val) +{ + u32 *option = data; + + *option = val; + + if (option == &m3_ipc_state->halt) { + if (val) + wkup_m3_set_halt_late(true); + else + wkup_m3_set_halt_late(false); + } + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(wkup_m3_ipc_option_fops, option_get, option_set, + "%llu\n"); + +static int wkup_m3_ipc_dbg_init(struct wkup_m3_ipc *m3_ipc) +{ + m3_ipc->dbg_path = debugfs_create_dir("wkup_m3_ipc", NULL); + + if (!m3_ipc->dbg_path) + return -EINVAL; + + (void)debugfs_create_file("enable_late_halt", 0644, + m3_ipc->dbg_path, + &m3_ipc->halt, + &wkup_m3_ipc_option_fops); + + return 0; +} + +static inline void wkup_m3_ipc_dbg_destroy(struct wkup_m3_ipc *m3_ipc) +{ + debugfs_remove_recursive(m3_ipc->dbg_path); +} +#else +static inline int wkup_m3_ipc_dbg_init(struct wkup_m3_ipc *m3_ipc) +{ + return 0; +} + +static inline void wkup_m3_ipc_dbg_destroy(struct wkup_m3_ipc *m3_ipc) +{ +} +#endif /* CONFIG_DEBUG_FS */ + static int wkup_m3_init_scale_data(struct wkup_m3_ipc *m3_ipc, struct device *dev) { @@ -402,7 +473,8 @@ static int wkup_m3_prepare_low_power(struct wkup_m3_ipc *m3_ipc, int state) wkup_m3_ctrl_ipc_write(m3_ipc, m3_power_state, 1); wkup_m3_ctrl_ipc_write(m3_ipc, m3_ipc->mem_type | m3_ipc->vtt_conf | - m3_ipc->isolation_conf, 4); + m3_ipc->isolation_conf | + m3_ipc->halt, 4); wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 2); wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 3); wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 6); @@ -634,6 +706,8 @@ static int wkup_m3_ipc_probe(struct platform_device *pdev) goto err_put_rproc; } + wkup_m3_ipc_dbg_init(m3_ipc); + return 0; err_put_rproc: @@ -645,6 +719,8 @@ static int wkup_m3_ipc_probe(struct platform_device *pdev) static int wkup_m3_ipc_remove(struct platform_device *pdev) { + wkup_m3_ipc_dbg_destroy(m3_ipc_state); + mbox_free_channel(m3_ipc_state->mbox); rproc_shutdown(m3_ipc_state->rproc); diff --git a/include/linux/wkup_m3_ipc.h b/include/linux/wkup_m3_ipc.h index fef0fac60f8c..26d1eb058fa3 100644 --- a/include/linux/wkup_m3_ipc.h +++ b/include/linux/wkup_m3_ipc.h @@ -36,6 +36,7 @@ struct wkup_m3_ipc { int vtt_conf; int isolation_conf; int state; + u32 halt; unsigned long volt_scale_offsets; const char *sd_fw_name; @@ -46,6 +47,7 @@ struct wkup_m3_ipc { struct wkup_m3_ipc_ops *ops; int is_rtc_only; + struct dentry *dbg_path; }; struct wkup_m3_wakeup_src {