diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/819-uart-0009-MLK-17133-02-tty-serial-lpuart-add-runtime-pm-suppor.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/819-uart-0009-MLK-17133-02-tty-serial-lpuart-add-runtime-pm-suppor.patch | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/target/linux/layerscape/patches-5.4/819-uart-0009-MLK-17133-02-tty-serial-lpuart-add-runtime-pm-suppor.patch b/target/linux/layerscape/patches-5.4/819-uart-0009-MLK-17133-02-tty-serial-lpuart-add-runtime-pm-suppor.patch deleted file mode 100644 index 5c0329583b..0000000000 --- a/target/linux/layerscape/patches-5.4/819-uart-0009-MLK-17133-02-tty-serial-lpuart-add-runtime-pm-suppor.patch +++ /dev/null @@ -1,199 +0,0 @@ -From ff3d8063eed907bed728a14e1519dc659036315a Mon Sep 17 00:00:00 2001 -From: Fugang Duan <fugang.duan@nxp.com> -Date: Wed, 11 Sep 2019 16:36:48 +0800 -Subject: [PATCH] MLK-17133-02 tty: serial: lpuart: add runtime pm support - -Add runtime pm support to manage lpuart clock and its power domain -to save power in system idle and system suspend stages. - -Signed-off-by: Fugang Duan <fugang.duan@nxp.com> -Reviewed-by: Robin Gong <yibin.gong@nxp.com> ---- - drivers/tty/serial/fsl_lpuart.c | 80 ++++++++++++++++++++++++++++++++++++----- - 1 file changed, 72 insertions(+), 8 deletions(-) - ---- a/drivers/tty/serial/fsl_lpuart.c -+++ b/drivers/tty/serial/fsl_lpuart.c -@@ -245,6 +245,7 @@ - - /* Rx DMA timeout in ms, which is used to calculate Rx ring buffer size */ - #define DMA_RX_TIMEOUT (10) -+#define UART_AUTOSUSPEND_TIMEOUT 3000 - - #define DRIVER_NAME "fsl-lpuart" - #define DEV_NAME "ttyLP" -@@ -859,6 +860,20 @@ static void lpuart32_start_tx(struct uar - } - } - -+static void -+lpuart_uart_pm(struct uart_port *port, unsigned int state, unsigned int oldstate) -+{ -+ switch (state) { -+ case UART_PM_STATE_OFF: -+ pm_runtime_mark_last_busy(port->dev); -+ pm_runtime_put_autosuspend(port->dev); -+ break; -+ default: -+ pm_runtime_get_sync(port->dev); -+ break; -+ } -+} -+ - /* return TIOCSER_TEMT when transmitter is not busy */ - static unsigned int lpuart_tx_empty(struct uart_port *port) - { -@@ -2283,6 +2298,7 @@ static const struct uart_ops lpuart_pops - .break_ctl = lpuart_break_ctl, - .startup = lpuart_startup, - .shutdown = lpuart_shutdown, -+ .pm = lpuart_uart_pm, - .set_termios = lpuart_set_termios, - .type = lpuart_type, - .request_port = lpuart_request_port, -@@ -2307,6 +2323,7 @@ static const struct uart_ops lpuart32_po - .break_ctl = lpuart32_break_ctl, - .startup = lpuart32_startup, - .shutdown = lpuart32_shutdown, -+ .pm = lpuart_uart_pm, - .set_termios = lpuart32_set_termios, - .type = lpuart_type, - .request_port = lpuart_request_port, -@@ -2769,6 +2786,11 @@ static int lpuart_probe(struct platform_ - if (ret) - goto failed_irq_request; - -+ pm_runtime_use_autosuspend(&pdev->dev); -+ pm_runtime_set_autosuspend_delay(&pdev->dev, UART_AUTOSUSPEND_TIMEOUT); -+ pm_runtime_set_active(&pdev->dev); -+ pm_runtime_enable(&pdev->dev); -+ - ret = uart_add_one_port(&lpuart_reg, &sport->port); - if (ret) - goto failed_attach_port; -@@ -2803,6 +2825,9 @@ static int lpuart_probe(struct platform_ - failed_reset: - uart_remove_one_port(&lpuart_reg, &sport->port); - failed_attach_port: -+ pm_runtime_disable(&pdev->dev); -+ pm_runtime_set_suspended(&pdev->dev); -+ pm_runtime_dont_use_autosuspend(&pdev->dev); - failed_irq_request: - lpuart_disable_clks(sport); - failed_clock_enable: -@@ -2829,15 +2854,41 @@ static int lpuart_remove(struct platform - if (sport->dma_rx_chan) - dma_release_channel(sport->dma_rx_chan); - -+ pm_runtime_disable(&pdev->dev); -+ pm_runtime_set_suspended(&pdev->dev); -+ pm_runtime_dont_use_autosuspend(&pdev->dev); - return 0; - } - - #ifdef CONFIG_PM_SLEEP -+static int lpuart_runtime_suspend(struct device *dev) -+{ -+ struct platform_device *pdev = to_platform_device(dev); -+ struct lpuart_port *sport = platform_get_drvdata(pdev); -+ -+ lpuart_disable_clks(sport); -+ -+ return 0; -+}; -+ -+static int lpuart_runtime_resume(struct device *dev) -+{ -+ struct platform_device *pdev = to_platform_device(dev); -+ struct lpuart_port *sport = platform_get_drvdata(pdev); -+ -+ return lpuart_enable_clks(sport); -+}; -+ - static int lpuart_suspend(struct device *dev) - { - struct lpuart_port *sport = dev_get_drvdata(dev); - unsigned long temp; - bool irq_wake; -+ int ret; -+ -+ ret = clk_prepare_enable(sport->ipg_clk); -+ if (ret) -+ return ret; - - if (lpuart_is_32(sport)) { - /* disable Rx/Tx and interrupts */ -@@ -2851,10 +2902,14 @@ static int lpuart_suspend(struct device - writeb(temp, sport->port.membase + UARTCR2); - } - -+ clk_disable_unprepare(sport->ipg_clk); -+ - uart_suspend_port(&lpuart_reg, &sport->port); - - /* uart_suspend_port() might set wakeup flag */ - irq_wake = irqd_is_wakeup_set(irq_get_irq_data(sport->port.irq)); -+ if (sport->port.suspended && !irq_wake) -+ return 0; - - if (sport->lpuart_dma_rx_use) { - /* -@@ -2885,9 +2940,6 @@ static int lpuart_suspend(struct device - dmaengine_terminate_all(sport->dma_tx_chan); - } - -- if (sport->port.suspended && !irq_wake) -- lpuart_disable_clks(sport); -- - return 0; - } - -@@ -2895,9 +2947,11 @@ static int lpuart_resume(struct device * - { - struct lpuart_port *sport = dev_get_drvdata(dev); - bool irq_wake = irqd_is_wakeup_set(irq_get_irq_data(sport->port.irq)); -+ int ret; - -- if (sport->port.suspended && !irq_wake) -- lpuart_enable_clks(sport); -+ ret = clk_prepare_enable(sport->ipg_clk); -+ if (ret) -+ return ret; - - if (lpuart_is_32(sport)) - lpuart32_setup_watermark_enable(sport); -@@ -2918,13 +2972,23 @@ static int lpuart_resume(struct device * - if (lpuart_is_32(sport)) - lpuart32_configure(sport); - -+ clk_disable_unprepare(sport->ipg_clk); -+ - uart_resume_port(&lpuart_reg, &sport->port); - - return 0; - } --#endif -+static const struct dev_pm_ops lpuart_pm_ops = { -+ SET_RUNTIME_PM_OPS(lpuart_runtime_suspend, -+ lpuart_runtime_resume, NULL) -+ SET_SYSTEM_SLEEP_PM_OPS(lpuart_suspend, lpuart_resume) -+}; -+#define SERIAL_LPUART_PM_OPS (&lpuart_pm_ops) - --static SIMPLE_DEV_PM_OPS(lpuart_pm_ops, lpuart_suspend, lpuart_resume); -+#else /* !CONFIG_PM_SLEEP */ -+ -+#define SERIAL_LPUART_PM_OPS NULL -+#endif - - static struct platform_driver lpuart_driver = { - .probe = lpuart_probe, -@@ -2932,7 +2996,7 @@ static struct platform_driver lpuart_dri - .driver = { - .name = "fsl-lpuart", - .of_match_table = lpuart_dt_ids, -- .pm = &lpuart_pm_ops, -+ .pm = SERIAL_LPUART_PM_OPS, - }, - }; - |