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d="scan'208";a="137664785" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa3.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 23 Sep 2021 06:21:10 -0700 Received: from chn-vm-ex03.mchp-main.com (10.10.85.151) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.14; Thu, 23 Sep 2021 06:21:06 -0700 Received: from rob-dk-mpu01.microchip.com (10.10.115.15) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server id 15.1.2176.14 via Frontend Transport; Thu, 23 Sep 2021 06:21:04 -0700 From: Claudiu Beznea To: , , , , CC: , , , Claudiu Beznea Subject: [PATCH v4 02/17] clk: at91: pmc: execute suspend/resume only for backup mode Date: Thu, 23 Sep 2021 16:20:31 +0300 Message-ID: <20210923132046.1860549-3-claudiu.beznea@microchip.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210923132046.1860549-1-claudiu.beznea@microchip.com> References: <20210923132046.1860549-1-claudiu.beznea@microchip.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210923_062111_186932_899B29E4 X-CRM114-Status: GOOD ( 16.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Before going to backup mode architecture specific PM code sets the first word in securam (file arch/arm/mach-at91/pm.c, function at91_pm_begin()). Thus take this into account when suspending/resuming clocks. This will avoid executing unnecessary instructions when suspending to non backup modes. Also this commit changed the postcore_initcall() with subsys_initcall() to be able to execute of_find_compatible_node() since this was not available at the moment of postcore_initcall(). This should not alter the tcb_clksrc since the changes are related to clocks suspend/resume procedure that will be executed at the user space request, thus long ago after subsys_initcall(). Signed-off-by: Claudiu Beznea --- drivers/clk/at91/pmc.c | 49 ++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 47 insertions(+), 2 deletions(-) diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c index b2806946a77a..58e9c088cb22 100644 --- a/drivers/clk/at91/pmc.c +++ b/drivers/clk/at91/pmc.c @@ -8,6 +8,8 @@ #include #include #include +#include +#include #include #include #include @@ -110,13 +112,35 @@ struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem, } #ifdef CONFIG_PM + +/* Address in SECURAM that say if we suspend to backup mode. */ +static void __iomem *at91_pmc_backup_suspend; + static int at91_pmc_suspend(void) { + unsigned int backup; + + if (!at91_pmc_backup_suspend) + return 0; + + backup = *(unsigned int *)at91_pmc_backup_suspend; + if (!backup) + return 0; + return clk_save_context(); } static void at91_pmc_resume(void) { + unsigned int backup; + + if (!at91_pmc_backup_suspend) + return; + + backup = *(unsigned int *)at91_pmc_backup_suspend; + if (!backup) + return; + clk_restore_context(); } @@ -132,6 +156,7 @@ static const struct of_device_id sama5d2_pmc_dt_ids[] = { static int __init pmc_register_ops(void) { + struct platform_device *pdev; struct device_node *np; np = of_find_matching_node(NULL, sama5d2_pmc_dt_ids); @@ -144,10 +169,30 @@ static int __init pmc_register_ops(void) } of_node_put(np); + np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam"); + if (!np) + return -ENODEV; + + if (!of_device_is_available(np)) { + of_node_put(np); + return -ENODEV; + } + + pdev = of_find_device_by_node(np); + of_node_put(np); + if (!pdev) + return -ENODEV; + + at91_pmc_backup_suspend = of_iomap(np, 0); + if (!at91_pmc_backup_suspend) { + pr_warn("%s(): unable to map securam\n", __func__); + return -ENOMEM; + } + register_syscore_ops(&pmc_syscore_ops); return 0; } -/* This has to happen before arch_initcall because of the tcb_clksrc driver */ -postcore_initcall(pmc_register_ops); + +subsys_initcall(pmc_register_ops); #endif -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel