From: Udit Kumar <u-kumar1@ti.com>

Few times, core1 was scheduled to boot first before core0, which leads
to error:

'k3_r5_rproc_start: can not start core 1 before core 0'.

This was happening due to some scheduling between prepare and start
callback. The probe function waits for event, which is getting
triggered by prepare callback. To avoid above condition move event
trigger to start instead of prepare callback.

Fixes: 61f6f68447ab ("remoteproc: k3-r5: Wait for core0 power-up before powering up core1")
Signed-off-by: Udit Kumar <u-kumar1@ti.com>
[ Applied wakeup event trigger only for Split-Mode booted rprocs ]
Signed-off-by: Beleswar Padhi <b-padhi@ti.com>
---
 drivers/remoteproc/ti_k3_r5_remoteproc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/ti_k3_r5_remoteproc.c b/drivers/remoteproc/ti_k3_r5_remoteproc.c
index 39a47540c590..f1710a61247f 100644
--- a/drivers/remoteproc/ti_k3_r5_remoteproc.c
+++ b/drivers/remoteproc/ti_k3_r5_remoteproc.c
@@ -464,8 +464,6 @@ static int k3_r5_rproc_prepare(struct rproc *rproc)
 			ret);
 		return ret;
 	}
-	core->released_from_reset = true;
-	wake_up_interruptible(&cluster->core_transition);
 
 	/*
 	 * Newer IP revisions like on J7200 SoCs support h/w auto-initialization
@@ -587,6 +585,9 @@ static int k3_r5_rproc_start(struct rproc *rproc)
 		ret = k3_r5_core_run(core);
 		if (ret)
 			goto put_mbox;
+
+		core->released_from_reset = true;
+		wake_up_interruptible(&cluster->core_transition);
 	}
 
 	return 0;
-- 
2.34.1

On Fri, Aug 09, 2024 at 11:31:32AM +0530, Beleswar Padhi wrote:
> From: Udit Kumar <u-kumar1@ti.com>
> 
> Few times, core1 was scheduled to boot first before core0, which leads
> to error:
> 
> 'k3_r5_rproc_start: can not start core 1 before core 0'.
> 
> This was happening due to some scheduling between prepare and start
> callback. The probe function waits for event, which is getting
> triggered by prepare callback. To avoid above condition move event
> trigger to start instead of prepare callback.

I can see the race condition.

> 
> Fixes: 61f6f68447ab ("remoteproc: k3-r5: Wait for core0 power-up before powering up core1")
> Signed-off-by: Udit Kumar <u-kumar1@ti.com>
> [ Applied wakeup event trigger only for Split-Mode booted rprocs ]
> Signed-off-by: Beleswar Padhi <b-padhi@ti.com>
> ---
>  drivers/remoteproc/ti_k3_r5_remoteproc.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/remoteproc/ti_k3_r5_remoteproc.c b/drivers/remoteproc/ti_k3_r5_remoteproc.c
> index 39a47540c590..f1710a61247f 100644
> --- a/drivers/remoteproc/ti_k3_r5_remoteproc.c
> +++ b/drivers/remoteproc/ti_k3_r5_remoteproc.c
> @@ -464,8 +464,6 @@ static int k3_r5_rproc_prepare(struct rproc *rproc)
>  			ret);
>  		return ret;
>  	}
> -	core->released_from_reset = true;
> -	wake_up_interruptible(&cluster->core_transition);
>  
>  	/*
>  	 * Newer IP revisions like on J7200 SoCs support h/w auto-initialization
> @@ -587,6 +585,9 @@ static int k3_r5_rproc_start(struct rproc *rproc)
>  		ret = k3_r5_core_run(core);
>  		if (ret)
>  			goto put_mbox;
> +
> +		core->released_from_reset = true;
> +		wake_up_interruptible(&cluster->core_transition);

This patch doesn't apply due to recent changes made to the k3-r5 driver.  Please
rebase and resubmit.

Thanks,
Mathieu

>  	}
>  
>  	return 0;
> -- 
> 2.34.1
>