[PATCH v7 20/21] OMAP2+: UART: Avoid uart idling on suspend for no_console_suspend usecase
From: Govindraj.R <hidden>
Date: 2011-10-18 15:35:40
Also in:
linux-omap, linux-serial
Subsystem:
arm port, omap2+ support, the rest · Maintainers:
Russell King, Aaro Koskinen, Andreas Kemnade, Kevin Hilman, Roger Quadros, Tony Lindgren, Linus Torvalds
If no_console_suspend is used we have prevent uart idling during suspend to provide debug prints. Power domain hooks can idle uarts if left enabled during system wide suspend so re-use the omap_device_disable_idle_on_suspend API's to ensure console_uart is not idled during suspend. omap_device_disable_idle_on_suspend API was used on all uarts since the uart driver was not runtime adapted, now with runtime adaptation we can re-use this API only for no_console_suspend use cases. Signed-off-by: Govindraj.R <redacted> --- arch/arm/mach-omap2/serial.c | 9 ++++++++- 1 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 55903f0..5e3bbce 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c@@ -64,6 +64,7 @@ struct omap_uart_state { static LIST_HEAD(uart_list); static u8 num_uarts; static u8 console_uart_id = -1; +static u8 no_console_suspend; #define DEFAULT_RXDMA_POLLRATE 1 /* RX DMA polling rate (us) */ #define DEFAULT_RXDMA_BUFSIZE 4096 /* RX DMA buffer size */
@@ -308,6 +309,10 @@ static int __init omap_serial_early_init(void) if (cmdline_find_option(uart_name)) { console_uart_id = uart->num; + + if (cmdline_find_option("no_console_suspend")) + no_console_suspend = true; + /* * omap-uart can be used for earlyprintk logs * So if omap-uart is used as console then prevent
@@ -400,7 +405,9 @@ void __init omap_serial_init_port(struct omap_board_data *bdata, od->pm_lats = console_uart_latency; } - omap_device_disable_idle_on_suspend(pdev); + if (no_console_suspend) + omap_device_disable_idle_on_suspend(pdev); + oh->mux = omap_hwmod_mux_init(bdata->pads, bdata->pads_cnt); uart->pdev = pdev;
--
1.7.4.1