[PATCH] drm/lima: fix recovering from PLBU out of memory

[Qiang Yu]

Looks good for me, patch is:
Reviewed-by: Qiang Yu <yuq825 at gmail.com>

Regards,
Qiang

On Sat, Feb 15, 2020 at 11:50 AM Vasily Khoruzhick <anarsoul at gmail.com> wrote:
>
> It looks like on PLBU_OUT_OF_MEM interrupt we need to resume from where we
> stopped, i.e. new PLBU heap start is old end. Also update end address
> in GP frame to grow heap on 2nd and subsequent out of memory interrupts.
>
> Fixes: 2081e8dcf1ee ("drm/lima: recover task by enlarging heap buffer")
> Signed-off-by: Vasily Khoruzhick <anarsoul at gmail.com>
> ---
>  drivers/gpu/drm/lima/lima_gp.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/lima/lima_gp.c b/drivers/gpu/drm/lima/lima_gp.c
> index d1e7826c2d74..325604262def 100644
> --- a/drivers/gpu/drm/lima/lima_gp.c
> +++ b/drivers/gpu/drm/lima/lima_gp.c
> @@ -224,8 +224,13 @@ static int lima_gp_task_recover(struct lima_sched_pipe *pipe)
>         }
>
>         gp_write(LIMA_GP_INT_MASK, LIMA_GP_IRQ_MASK_USED);
> +       /* Resume from where we stopped, i.e. new start is old end */
> +       gp_write(LIMA_GP_PLBU_ALLOC_START_ADDR,
> +                f[LIMA_GP_PLBU_ALLOC_END_ADDR >> 2]);
> +       f[LIMA_GP_PLBU_ALLOC_END_ADDR >> 2] =
> +               f[LIMA_GP_PLBU_ALLOC_START_ADDR >> 2] + task->heap->heap_size;
>         gp_write(LIMA_GP_PLBU_ALLOC_END_ADDR,
> -                f[LIMA_GP_PLBU_ALLOC_START_ADDR >> 2] + task->heap->heap_size);
> +                f[LIMA_GP_PLBU_ALLOC_END_ADDR >> 2]);
>         gp_write(LIMA_GP_CMD, LIMA_GP_CMD_UPDATE_PLBU_ALLOC);
>         return 0;
>  }
> --
> 2.25.0
>