+++ /dev/null
-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,
- },
- };
-
projects / openwrt / staging / wigyori.git / blobdiff