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Subject[PATCH/Resend 2/2] arm: mach-omap2: prevent UART console idle on suspend while using "no_console_suspend"
Date
With dt boot, uart wakeup after suspend is non functional on omap4/5 while using
"no_console_suspend" in the bootargs. With "no_console_suspend" used, od->flags
should be ORed with "OMAP_DEVICE_NO_IDLE_ON_SUSPEND", thereby not allowing the console
to idle in the suspend path. For non-dt case, this was taken care by platform data.

Tested on omap5430evm, omap4430sdp.

Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Rajendra nayak <rnayak@ti.com>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
---
arch/arm/mach-omap2/omap_device.c | 34 +++++++++++++++++++++++++++++++++-
1 files changed, 33 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c
index 381be7a..71f5a73 100644
--- a/arch/arm/mach-omap2/omap_device.c
+++ b/arch/arm/mach-omap2/omap_device.c
@@ -35,11 +35,17 @@
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/notifier.h>
+#include <linux/platform_data/serial-omap.h>

#include "soc.h"
#include "omap_device.h"
#include "omap_hwmod.h"

+#define MAX_UART_HWMOD_NAME_LEN 16
+
+static u8 no_console_suspend;
+static u8 console_uart_num;
+
/* Private functions */

static void _add_clkdev(struct omap_device *od, const char *clk_alias,
@@ -108,6 +114,12 @@ static void _add_hwmod_clocks_clkdev(struct omap_device *od,
_add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
}

+static char *cmdline_find_option(char *str)
+{
+ extern char *saved_command_line;
+
+ return strstr(saved_command_line, str);
+}

/**
* omap_device_build_from_dt - build an omap_device with multiple hwmods
@@ -129,6 +141,7 @@ static int omap_device_build_from_dt(struct platform_device *pdev)
struct device_node *node = pdev->dev.of_node;
const char *oh_name;
int oh_cnt, i, ret = 0;
+ static u8 console_uart_id;

oh_cnt = of_property_count_strings(node, "ti,hwmods");
if (!oh_cnt || IS_ERR_VALUE(oh_cnt)) {
@@ -170,7 +183,12 @@ static int omap_device_build_from_dt(struct platform_device *pdev)
r->name = dev_name(&pdev->dev);
}

- if (of_get_property(node, "ti,no_idle_on_suspend", NULL))
+ if (no_console_suspend && !strncmp(oh->name, "uart", 4)) {
+ if (console_uart_num == console_uart_id)
+ omap_device_disable_idle_on_suspend(pdev);
+ else
+ console_uart_id++;
+ } else if (of_get_property(node, "ti,no_idle_on_suspend", NULL))
omap_device_disable_idle_on_suspend(pdev);

pdev->dev.pm_domain = &omap_device_pm_domain;
@@ -838,7 +856,21 @@ static struct notifier_block platform_nb = {

static int __init omap_device_init(void)
{
+ int i;
+ char uart_name[MAX_UART_HWMOD_NAME_LEN];
+
bus_register_notifier(&platform_bus_type, &platform_nb);
+
+ if (cmdline_find_option("no_console_suspend")) {
+ no_console_suspend = true;
+ for (i = 0; i < OMAP_MAX_HSUART_PORTS; i++) {
+ snprintf(uart_name, MAX_UART_HWMOD_NAME_LEN,
+ "%s%d", OMAP_SERIAL_NAME, i);
+ if (cmdline_find_option(uart_name))
+ console_uart_num = i;
+ }
+ }
+
return 0;
}
omap_core_initcall(omap_device_init);
--
1.7.1


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