From patchwork Fri Dec 7 10:36:08 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 13413 Return-Path: X-Original-To: patchwork@peony.canonical.com Delivered-To: patchwork@peony.canonical.com Received: from fiordland.canonical.com (fiordland.canonical.com [91.189.94.145]) by peony.canonical.com (Postfix) with ESMTP id 07ADD23FC0 for ; Fri, 7 Dec 2012 10:36:37 +0000 (UTC) Received: from mail-ia0-f169.google.com (mail-ia0-f169.google.com [209.85.210.169]) by fiordland.canonical.com (Postfix) with ESMTP id 8F9B9A187E4 for ; Fri, 7 Dec 2012 10:36:36 +0000 (UTC) Received: by mail-ia0-f169.google.com with SMTP id r4so356502iaj.0 for ; Fri, 07 Dec 2012 02:36:35 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-forwarded-to:x-forwarded-for:delivered-to:received-spf:from:to:cc :subject:date:message-id:x-mailer:mime-version:content-type :x-gm-message-state; bh=aqyz8WFL+bEv99RsaSLhF6dgHZiFsc4zPP2xiXaXptA=; b=IJES3WTmk9xuuqq5nPOMSzhik+jn4RieLbzgZBrBaX7LFcLWbXPmRljbMnUchXnICs yZ2AuPyM5RyLxyRiShO5Z3k01JvJfMbYSyisoditG4EkQP8XUZ1nVIb79FEZUmPgwn9p 11MF0KswiQlS32AFHng9d1StiKiC5fksiJ1PFvsBAKOrcBigkus1XpWw2r0pmzU65F9P KKB8CVQgC5KJm+CWbKp0JMfzkm0klafLs9YDBv+OEsNg9u+Q5+0BQ5rxLBk+ZtGCPBvG XmorB2LOmYgkYmk6O9kgyfo35CxqvZbxuW+poI20b9oalLEpadz3Xu1kn//DfuO4gHHR kRcg== Received: by 10.50.187.197 with SMTP id fu5mr4451001igc.70.1354876595799; Fri, 07 Dec 2012 02:36:35 -0800 (PST) X-Forwarded-To: linaro-patchwork@canonical.com X-Forwarded-For: patch@linaro.org linaro-patchwork@canonical.com Delivered-To: patches@linaro.org Received: by 10.50.67.148 with SMTP id n20csp465980igt; Fri, 7 Dec 2012 02:36:35 -0800 (PST) Received: by 10.14.214.132 with SMTP id c4mr15415603eep.18.1354876594506; Fri, 07 Dec 2012 02:36:34 -0800 (PST) Received: from eu1sys200aog103.obsmtp.com (eu1sys200aog103.obsmtp.com [207.126.144.115]) by mx.google.com with SMTP id i42si23369218eem.124.2012.12.07.02.36.30 (version=TLSv1/SSLv3 cipher=OTHER); Fri, 07 Dec 2012 02:36:34 -0800 (PST) Received-SPF: neutral (google.com: 207.126.144.115 is neither permitted nor denied by best guess record for domain of linus.walleij@stericsson.com) client-ip=207.126.144.115; Authentication-Results: mx.google.com; spf=neutral (google.com: 207.126.144.115 is neither permitted nor denied by best guess record for domain of linus.walleij@stericsson.com) smtp.mail=linus.walleij@stericsson.com Received: from beta.dmz-eu.st.com ([164.129.1.35]) (using TLSv1) by eu1sys200aob103.postini.com ([207.126.147.11]) with SMTP ID DSNKUMHGrtUgmT6YFxB/KgBRtEBsb7cT2yS+@postini.com; Fri, 07 Dec 2012 10:36:34 UTC Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 3D2588C; Fri, 7 Dec 2012 10:36:28 +0000 (GMT) Received: from relay1.stm.gmessaging.net (unknown [10.230.100.17]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id B3CC32B25; Fri, 7 Dec 2012 10:36:27 +0000 (GMT) Received: from exdcvycastm004.EQ1STM.local (alteon-source-exch [10.230.100.61]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (Client CN "exdcvycastm004", Issuer "exdcvycastm004" (not verified)) by relay1.stm.gmessaging.net (Postfix) with ESMTPS id 081C024C301; Fri, 7 Dec 2012 11:36:12 +0100 (CET) Received: from steludxu4075.lud.stericsson.com (10.230.100.153) by smtp.stericsson.com (10.230.100.2) with Microsoft SMTP Server (TLS) id 8.3.83.0; Fri, 7 Dec 2012 11:36:17 +0100 From: Linus Walleij To: , Greg Kroah-Hartman Cc: Alan Cox , Rickard Andersson , , Linus Walleij Subject: [PATCH v2] tty: serial core: decouple pm states from ACPI Date: Fri, 7 Dec 2012 11:36:08 +0100 Message-ID: <1354876568-10617-1-git-send-email-linus.walleij@stericsson.com> X-Mailer: git-send-email 1.7.11.3 MIME-Version: 1.0 X-Gm-Message-State: ALoCoQnwreO8DAosRiGAqF8HfkIxdgSDJvTLx7hgZnf5UaEGpxPqhC3/nPKWBTngOuUX+cxKkisW From: Linus Walleij The serial core is using power states lifted from ACPI for no good reason. Remove this reference from the documentation and alter all users to use an enum specific to the serial core instead, and define it in . Signed-off-by: Linus Walleij --- ChangeLog v1->v2: - rename states from _DEFAULT and _SLEEP to simply _ON and _OFF as Rafael suggests. --- Documentation/serial/driver | 5 ++--- drivers/tty/serial/serial_core.c | 30 ++++++++++++++++-------------- include/linux/serial_core.h | 14 +++++++++++++- 3 files changed, 31 insertions(+), 18 deletions(-) diff --git a/Documentation/serial/driver b/Documentation/serial/driver index 0a25a91..a6ef8dc 100644 --- a/Documentation/serial/driver +++ b/Documentation/serial/driver @@ -242,9 +242,8 @@ hardware. pm(port,state,oldstate) Perform any power management related activities on the specified - port. State indicates the new state (defined by ACPI D0-D3), - oldstate indicates the previous state. Essentially, D0 means - fully on, D3 means powered down. + port. State indicates the new state (defined by + enum uart_pm_state), oldstate indicates the previous state. This function should not be used to grab any resources. diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 2c7230a..82d7ce8 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -59,7 +59,8 @@ static struct lock_class_key port_lock_key; static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, struct ktermios *old_termios); static void uart_wait_until_sent(struct tty_struct *tty, int timeout); -static void uart_change_pm(struct uart_state *state, int pm_state); +static void uart_change_pm(struct uart_state *state, + enum uart_pm_state pm_state); static void uart_port_shutdown(struct tty_port *port); @@ -1365,7 +1366,7 @@ static void uart_close(struct tty_struct *tty, struct file *filp) spin_lock_irqsave(&port->lock, flags); } else if (!uart_console(uport)) { spin_unlock_irqrestore(&port->lock, flags); - uart_change_pm(state, 3); + uart_change_pm(state, UART_PM_STATE_OFF); spin_lock_irqsave(&port->lock, flags); } @@ -1579,7 +1580,7 @@ static int uart_open(struct tty_struct *tty, struct file *filp) * Make sure the device is in D0 state. */ if (port->count == 1) - uart_change_pm(state, 0); + uart_change_pm(state, UART_PM_STATE_ON); /* * Start up the serial port. @@ -1620,7 +1621,7 @@ static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) { struct uart_state *state = drv->state + i; struct tty_port *port = &state->port; - int pm_state; + enum uart_pm_state pm_state; struct uart_port *uport = state->uart_port; char stat_buf[32]; unsigned int status; @@ -1645,12 +1646,12 @@ static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) if (capable(CAP_SYS_ADMIN)) { mutex_lock(&port->mutex); pm_state = state->pm_state; - if (pm_state) - uart_change_pm(state, 0); + if (pm_state != UART_PM_STATE_ON) + uart_change_pm(state, UART_PM_STATE_ON); spin_lock_irq(&uport->lock); status = uport->ops->get_mctrl(uport); spin_unlock_irq(&uport->lock); - if (pm_state) + if (pm_state != UART_PM_STATE_ON) uart_change_pm(state, pm_state); mutex_unlock(&port->mutex); @@ -1897,7 +1898,8 @@ EXPORT_SYMBOL_GPL(uart_set_options); * * Locking: port->mutex has to be held */ -static void uart_change_pm(struct uart_state *state, int pm_state) +static void uart_change_pm(struct uart_state *state, + enum uart_pm_state pm_state) { struct uart_port *port = state->uart_port; @@ -1982,7 +1984,7 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) console_stop(uport->cons); if (console_suspend_enabled || !uart_console(uport)) - uart_change_pm(state, 3); + uart_change_pm(state, UART_PM_STATE_OFF); mutex_unlock(&port->mutex); @@ -2027,7 +2029,7 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) termios = port->tty->termios; if (console_suspend_enabled) - uart_change_pm(state, 0); + uart_change_pm(state, UART_PM_STATE_ON); uport->ops->set_termios(uport, &termios, NULL); if (console_suspend_enabled) console_start(uport->cons); @@ -2037,7 +2039,7 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) const struct uart_ops *ops = uport->ops; int ret; - uart_change_pm(state, 0); + uart_change_pm(state, UART_PM_STATE_ON); spin_lock_irq(&uport->lock); ops->set_mctrl(uport, 0); spin_unlock_irq(&uport->lock); @@ -2137,7 +2139,7 @@ uart_configure_port(struct uart_driver *drv, struct uart_state *state, uart_report_port(drv, port); /* Power up port for set_mctrl() */ - uart_change_pm(state, 0); + uart_change_pm(state, UART_PM_STATE_ON); /* * Ensure that the modem control lines are de-activated. @@ -2161,7 +2163,7 @@ uart_configure_port(struct uart_driver *drv, struct uart_state *state, * console if we have one. */ if (!uart_console(port)) - uart_change_pm(state, 3); + uart_change_pm(state, UART_PM_STATE_OFF); } } @@ -2588,7 +2590,7 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) } state->uart_port = uport; - state->pm_state = -1; + state->pm_state = UART_PM_STATE_UNDEFINED; uport->cons = drv->cons; uport->state = state; diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index c6690a2..a116daa 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -208,13 +208,25 @@ static inline void serial_port_out(struct uart_port *up, int offset, int value) up->serial_out(up, offset, value); } +/** + * enum uart_pm_state - power states for UARTs + * @UART_PM_STATE_ON: UART is powered, up and operational + * @UART_PM_STATE_OFF: UART is powered off + * @UART_PM_STATE_UNDEFINED: sentinel + */ +enum uart_pm_state { + UART_PM_STATE_ON = 0, + UART_PM_STATE_OFF = 3, /* number taken from ACPI */ + UART_PM_STATE_UNDEFINED, +}; + /* * This is the state information which is persistent across opens. */ struct uart_state { struct tty_port port; - int pm_state; + enum uart_pm_state pm_state; struct circ_buf xmit; struct uart_port *uart_port;