jean.pi...@newoldbits.com writes:
> From: Jean Pihet <j-pi...@ti.com>
>
> Some bad interaction between the idle and the suspend paths has been
> noticed: the idle code is called during the suspend enter and exit
> sequences. This could cause corruption or lock-up of resources.
>
> The solution is to move the calls to disable_hlt at the very beginning
> of the suspend sequence (ex. in omap3_pm_begin instead of
> omap3_pm_prepare), and the call to enable_hlt at the very end of
> the suspend sequence (ex. in omap3_pm_end instead of omap3_pm_finish).
In an earlier version, I thought we agreed to just remove the empty
prepare/finish calls. Can you do that?
Also, can you base this on top of my recently posted patch:
[PATCH v3] OMAP2+: PM/serial: fix console semaphore acquire during suspend
since it touches some of the same code for pm24xx.c
Thanks,
Kevin
> Tested with RET and OFF on Beagle and OMAP3EVM.
>
> Signed-off-by: Jean Pihet <j-pi...@ti.com>
> Cc: Kevin Hilman <khil...@deeprootsystems.com>
> ---
> v1: support for OMAP3 only.
> Tested on board.
>
> v2: Added support for OMAP2 and OMAP4.
> Compile tested only for OMAP2 and OMAP4.
> Tested on board for OMAP3.
>
> arch/arm/mach-omap2/pm24xx.c | 16 ++++++++++++++--
> arch/arm/mach-omap2/pm34xx.c | 4 ++--
> arch/arm/mach-omap2/pm44xx.c | 4 ++--
> 3 files changed, 18 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/pm24xx.c b/arch/arm/mach-omap2/pm24xx.c
> index c85923e..3820179 100644
> --- a/arch/arm/mach-omap2/pm24xx.c
> +++ b/arch/arm/mach-omap2/pm24xx.c
> @@ -286,8 +286,6 @@ out:
>
> static int omap2_pm_prepare(void)
> {
> - /* We cannot sleep in idle until we have resumed */
> - disable_hlt();
> return 0;
> }
>
> @@ -330,10 +328,24 @@ static int omap2_pm_enter(suspend_state_t state)
>
> static void omap2_pm_finish(void)
> {
> +}
>
> +
> +static int omap2_pm_begin(suspend_state_t state)
> +{
> + /* We cannot sleep in idle until we have resumed */
> + disable_hlt();
> + return 0;
> +}
> +
> +static void omap2_pm_end(void)
> +{
> enable_hlt();
> + return;
> }
>
> static struct platform_suspend_ops omap_pm_ops = {
> + .begin = omap2_pm_begin,
> + .end = omap2_pm_end,
> .prepare = omap2_pm_prepare,
> .enter = omap2_pm_enter,
> .finish = omap2_pm_finish,
> diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
> index 0ec8a04..ec80d38 100644
> --- a/arch/arm/mach-omap2/pm34xx.c
> +++ b/arch/arm/mach-omap2/pm34xx.c
> @@ -518,7 +518,6 @@ static suspend_state_t suspend_state;
>
> static int omap3_pm_prepare(void)
> {
> - disable_hlt();
> return 0;
> }
>
> @@ -586,12 +585,12 @@ static int omap3_pm_enter(suspend_state_t unused)
>
> static void omap3_pm_finish(void)
> {
> - enable_hlt();
> }
>
> /* Hooks to enable / disable UART interrupts during suspend */
> static int omap3_pm_begin(suspend_state_t state)
> {
> + disable_hlt();
> suspend_state = state;
> omap_uart_enable_irqs(0);
> return 0;
> @@ -601,6 +600,7 @@ static void omap3_pm_end(void)
> {
> suspend_state = PM_SUSPEND_ON;
> omap_uart_enable_irqs(1);
> + enable_hlt();
> return;
> }
>
> diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c
> index 54544b4..f4c4fab 100644
> --- a/arch/arm/mach-omap2/pm44xx.c
> +++ b/arch/arm/mach-omap2/pm44xx.c
> @@ -33,7 +33,6 @@ static LIST_HEAD(pwrst_list);
> #ifdef CONFIG_SUSPEND
> static int omap4_pm_prepare(void)
> {
> - disable_hlt();
> return 0;
> }
>
> @@ -61,17 +60,18 @@ static int omap4_pm_enter(suspend_state_t suspend_state)
>
> static void omap4_pm_finish(void)
> {
> - enable_hlt();
> return;
> }
>
> static int omap4_pm_begin(suspend_state_t state)
> {
> + disable_hlt();
> return 0;
> }
>
> static void omap4_pm_end(void)
> {
> + enable_hlt();
> return;
> }
--
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