From patchwork Tue Jul 27 10:31:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 488309 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.9 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B6B92C4320A for ; Tue, 27 Jul 2021 10:31:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9173361884 for ; Tue, 27 Jul 2021 10:31:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236036AbhG0Kby (ORCPT ); Tue, 27 Jul 2021 06:31:54 -0400 Received: from muru.com ([72.249.23.125]:55864 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231745AbhG0Kbx (ORCPT ); Tue, 27 Jul 2021 06:31:53 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 451BD80F0; Tue, 27 Jul 2021 10:32:10 +0000 (UTC) From: Tony Lindgren To: Greg Kroah-Hartman Cc: Vignesh Raghavendra , linux-serial@vger.kernel.org, linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, Andy Shevchenko , Dario Binacchi Subject: [PATCH 1/2] serial: omap: Disable PM runtime autoidle to remove pm_runtime_irq_safe() Date: Tue, 27 Jul 2021 13:31:48 +0300 Message-Id: <20210727103149.51175-1-tony@atomide.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org We want to remove the use of pm_runtime_irq_safe() from serial drivers to allow making PM runtime handling generic. Let's simplify things by disabling PM runtime autoidle for omap-serial as this driver has been deprecated for years because of the 8250_omap driver. There are still some omap-serial users that seem to hang on to it for some unknown rs485 reasons it seems. But presumably those folks do not need PM runtime autoidle with omap-serial, and hopefully can just move to using 8250_omap driver instead. For 8250_omap driver, we will eventually move to use generic serial layer PM based on patches done by Andy Shevchenko to remove pm_runtime_irq_safe() usage. Cc: Andy Shevchenko Cc: Dario Binacchi Cc: Vignesh Raghavendra Signed-off-by: Tony Lindgren --- drivers/tty/serial/omap-serial.c | 75 +------------------------------- 1 file changed, 2 insertions(+), 73 deletions(-) diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -276,11 +276,8 @@ static void serial_omap_enable_ms(struct uart_port *port) dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line); - pm_runtime_get_sync(up->dev); up->ier |= UART_IER_MSI; serial_out(up, UART_IER, up->ier); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); } static void serial_omap_stop_tx(struct uart_port *port) @@ -288,8 +285,6 @@ static void serial_omap_stop_tx(struct uart_port *port) struct uart_omap_port *up = to_uart_omap_port(port); int res; - pm_runtime_get_sync(up->dev); - /* Handle RS-485 */ if (port->rs485.flags & SER_RS485_ENABLED) { if (up->scr & OMAP_UART_SCR_TX_EMPTY) { @@ -330,21 +325,15 @@ static void serial_omap_stop_tx(struct uart_port *port) up->ier &= ~UART_IER_THRI; serial_out(up, UART_IER, up->ier); } - - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); } static void serial_omap_stop_rx(struct uart_port *port) { struct uart_omap_port *up = to_uart_omap_port(port); - pm_runtime_get_sync(up->dev); up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); up->port.read_status_mask &= ~UART_LSR_DR; serial_out(up, UART_IER, up->ier); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); } static void transmit_chars(struct uart_omap_port *up, unsigned int lsr) @@ -399,8 +388,6 @@ static void serial_omap_start_tx(struct uart_port *port) struct uart_omap_port *up = to_uart_omap_port(port); int res; - pm_runtime_get_sync(up->dev); - /* Handle RS-485 */ if (port->rs485.flags & SER_RS485_ENABLED) { /* Fire THR interrupts when FIFO is below trigger level */ @@ -421,8 +408,6 @@ static void serial_omap_start_tx(struct uart_port *port) up->rs485_tx_filter_count = 0; serial_omap_enable_ier_thri(up); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); } static void serial_omap_throttle(struct uart_port *port) @@ -430,13 +415,10 @@ static void serial_omap_throttle(struct uart_port *port) struct uart_omap_port *up = to_uart_omap_port(port); unsigned long flags; - pm_runtime_get_sync(up->dev); spin_lock_irqsave(&up->port.lock, flags); up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); serial_out(up, UART_IER, up->ier); spin_unlock_irqrestore(&up->port.lock, flags); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); } static void serial_omap_unthrottle(struct uart_port *port) @@ -444,13 +426,10 @@ static void serial_omap_unthrottle(struct uart_port *port) struct uart_omap_port *up = to_uart_omap_port(port); unsigned long flags; - pm_runtime_get_sync(up->dev); spin_lock_irqsave(&up->port.lock, flags); up->ier |= UART_IER_RLSI | UART_IER_RDI; serial_out(up, UART_IER, up->ier); spin_unlock_irqrestore(&up->port.lock, flags); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); } static unsigned int check_modem_status(struct uart_omap_port *up) @@ -576,7 +555,6 @@ static irqreturn_t serial_omap_irq(int irq, void *dev_id) int max_count = 256; spin_lock(&up->port.lock); - pm_runtime_get_sync(up->dev); do { iir = serial_in(up, UART_IIR); @@ -616,8 +594,6 @@ static irqreturn_t serial_omap_irq(int irq, void *dev_id) tty_flip_buffer_push(&up->port.state->port); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); up->port_activity = jiffies; return ret; @@ -629,13 +605,11 @@ static unsigned int serial_omap_tx_empty(struct uart_port *port) unsigned long flags; unsigned int ret = 0; - pm_runtime_get_sync(up->dev); dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line); spin_lock_irqsave(&up->port.lock, flags); ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; spin_unlock_irqrestore(&up->port.lock, flags); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); + return ret; } @@ -645,10 +619,7 @@ static unsigned int serial_omap_get_mctrl(struct uart_port *port) unsigned int status; unsigned int ret = 0; - pm_runtime_get_sync(up->dev); status = check_modem_status(up); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line); @@ -680,7 +651,6 @@ static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) if (mctrl & TIOCM_LOOP) mcr |= UART_MCR_LOOP; - pm_runtime_get_sync(up->dev); old_mcr = serial_in(up, UART_MCR); old_mcr &= ~(UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_OUT1 | UART_MCR_DTR | UART_MCR_RTS); @@ -696,9 +666,6 @@ static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) up->efr &= ~UART_EFR_RTS; serial_out(up, UART_EFR, up->efr); serial_out(up, UART_LCR, lcr); - - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); } static void serial_omap_break_ctl(struct uart_port *port, int break_state) @@ -707,7 +674,6 @@ static void serial_omap_break_ctl(struct uart_port *port, int break_state) unsigned long flags; dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line); - pm_runtime_get_sync(up->dev); spin_lock_irqsave(&up->port.lock, flags); if (break_state == -1) up->lcr |= UART_LCR_SBC; @@ -715,8 +681,6 @@ static void serial_omap_break_ctl(struct uart_port *port, int break_state) up->lcr &= ~UART_LCR_SBC; serial_out(up, UART_LCR, up->lcr); spin_unlock_irqrestore(&up->port.lock, flags); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); } static int serial_omap_startup(struct uart_port *port) @@ -788,8 +752,6 @@ static int serial_omap_startup(struct uart_port *port) serial_out(up, UART_OMAP_WER, up->wer); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); up->port_activity = jiffies; return 0; } @@ -801,7 +763,6 @@ static void serial_omap_shutdown(struct uart_port *port) dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line); - pm_runtime_get_sync(up->dev); /* * Disable interrupts from this port */ @@ -825,8 +786,7 @@ static void serial_omap_shutdown(struct uart_port *port) if (serial_in(up, UART_LSR) & UART_LSR_DR) (void) serial_in(up, UART_RX); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); + pm_runtime_put_sync(up->dev); free_irq(up->port.irq, up); dev_pm_clear_wake_irq(up->dev); } @@ -896,7 +856,6 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, * Ok, we're now changing the port state. Do it with * interrupts disabled. */ - pm_runtime_get_sync(up->dev); spin_lock_irqsave(&up->port.lock, flags); /* @@ -1096,8 +1055,6 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, serial_omap_set_mctrl(&up->port, up->port.mctrl); spin_unlock_irqrestore(&up->port.lock, flags); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line); } @@ -1110,7 +1067,6 @@ serial_omap_pm(struct uart_port *port, unsigned int state, dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line); - pm_runtime_get_sync(up->dev); serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); efr = serial_in(up, UART_EFR); serial_out(up, UART_EFR, efr | UART_EFR_ECB); @@ -1120,9 +1076,6 @@ serial_omap_pm(struct uart_port *port, unsigned int state, serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); serial_out(up, UART_EFR, efr); serial_out(up, UART_LCR, 0); - - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); } static void serial_omap_release_port(struct uart_port *port) @@ -1202,11 +1155,8 @@ static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch) { struct uart_omap_port *up = to_uart_omap_port(port); - pm_runtime_get_sync(up->dev); wait_for_xmitr(up); serial_out(up, UART_TX, ch); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); } static int serial_omap_poll_get_char(struct uart_port *port) @@ -1214,7 +1164,6 @@ static int serial_omap_poll_get_char(struct uart_port *port) struct uart_omap_port *up = to_uart_omap_port(port); unsigned int status; - pm_runtime_get_sync(up->dev); status = serial_in(up, UART_LSR); if (!(status & UART_LSR_DR)) { status = NO_POLL_CHAR; @@ -1224,9 +1173,6 @@ static int serial_omap_poll_get_char(struct uart_port *port) status = serial_in(up, UART_RX); out: - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); - return status; } @@ -1309,8 +1255,6 @@ serial_omap_console_write(struct console *co, const char *s, unsigned int ier; int locked = 1; - pm_runtime_get_sync(up->dev); - local_irq_save(flags); if (up->port.sysrq) locked = 0; @@ -1343,8 +1287,6 @@ serial_omap_console_write(struct console *co, const char *s, if (up->msr_saved_flags) check_modem_status(up); - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); if (locked) spin_unlock(&up->port.lock); local_irq_restore(flags); @@ -1403,8 +1345,6 @@ serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485) unsigned int mode; int val; - pm_runtime_get_sync(up->dev); - /* Disable interrupts from this port */ mode = up->ier; up->ier = 0; @@ -1438,9 +1378,6 @@ serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485) serial_out(up, UART_OMAP_SCR, up->scr); } - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); - return 0; } @@ -1737,11 +1674,7 @@ static int serial_omap_probe(struct platform_device *pdev) omap_up_info->autosuspend_timeout = -1; device_init_wakeup(up->dev, true); - pm_runtime_use_autosuspend(&pdev->dev); - pm_runtime_set_autosuspend_delay(&pdev->dev, - omap_up_info->autosuspend_timeout); - pm_runtime_irq_safe(&pdev->dev); pm_runtime_enable(&pdev->dev); pm_runtime_get_sync(&pdev->dev); @@ -1755,12 +1688,9 @@ static int serial_omap_probe(struct platform_device *pdev) if (ret != 0) goto err_add_port; - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); return 0; err_add_port: - pm_runtime_dont_use_autosuspend(&pdev->dev); pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); cpu_latency_qos_remove_request(&up->pm_qos_request); @@ -1778,7 +1708,6 @@ static int serial_omap_remove(struct platform_device *dev) uart_remove_one_port(&serial_omap_reg, &up->port); - pm_runtime_dont_use_autosuspend(up->dev); pm_runtime_put_sync(up->dev); pm_runtime_disable(up->dev); cpu_latency_qos_remove_request(&up->pm_qos_request);