Re: [PATCH v12 04/36] remoteproc: k3-m4: Don't assert reset in detach routine

[Mathieu Poirier <mathieu.poirier@linaro.org>]

On Tue, May 13, 2025 at 11:14:38AM +0530, Beleswar Padhi wrote:
> The rproc_detach() function invokes __rproc_detach() before
> rproc_unprepare_device(). The __rproc_detach() function sets the
> rproc->state to "RPROC_DETACHED".
> 
> However, the TI K3 M4 driver erroneously looks for "RPROC_ATTACHED"
> state in its .unprepare ops to identify IPC-only mode; which leads to
> resetting the rproc in detach routine.
> 
> Therefore, correct the IPC-only mode detection logic to look for
> "RPROC_DETACHED" in k3_m4_rproc_unprepare() function.
>

This driver has been upstream for 9 whole months, it is hard for me to believe
this but was just noticed.  Martyn from Collabora should be CC'ed on this, and I
will also need the required R-b/T-b tags.

Typically bug fixes are not part of refactoring exercises.  I suggest to apply
this set without this patch - you can then work on fixing this bug.

Thanks,
Mathieu

> Fixes: ebcf9008a895 ("remoteproc: k3-m4: Add a remoteproc driver for M4F subsystem")
> Signed-off-by: Beleswar Padhi <b-padhi@ti.com>
> ---
> v12: Changelog:
> 1. New patch. Fixup a state detection logic.
> 
>  drivers/remoteproc/ti_k3_m4_remoteproc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/ti_k3_m4_remoteproc.c b/drivers/remoteproc/ti_k3_m4_remoteproc.c
> index a16fb165fcedd..6cd50b16a8e82 100644
> --- a/drivers/remoteproc/ti_k3_m4_remoteproc.c
> +++ b/drivers/remoteproc/ti_k3_m4_remoteproc.c
> @@ -228,7 +228,7 @@ static int k3_m4_rproc_unprepare(struct rproc *rproc)
>  	int ret;
>  
>  	/* If the core is going to be detached do not assert the module reset */
> -	if (rproc->state == RPROC_ATTACHED)
> +	if (rproc->state == RPROC_DETACHED)
>  		return 0;
>  
>  	ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> -- 
> 2.34.1
>