[PATCH 20/21] drm/etnaviv: enable debug registers on demand

[Lucas Stach]

Please add a short description, stating that the perfmon registers are
debug regs.

Am Freitag, den 09.06.2017, 12:26 +0200 schrieb Christian Gmeiner:
> Signed-off-by: Christian Gmeiner <christian.gmeiner at gmail.com>

Reviewed-by: Lucas Stach <l.stach at pengutronix.de>

> ---
>  drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> index 1e23472..faf2925 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> @@ -1336,6 +1336,11 @@ static void
> sync_point_perfmon_sample_pre(struct etnaviv_gpu *gpu,
>  	val &= ~VIVS_PM_POWER_CONTROLS_ENABLE_MODULE_CLOCK_GATING;
>  	gpu_write(gpu, VIVS_PM_POWER_CONTROLS, val);
>  
> +	/* enable debug register */
> +	val = gpu_read(gpu, VIVS_HI_CLOCK_CONTROL);
> +	val &= ~VIVS_HI_CLOCK_CONTROL_DISABLE_DEBUG_REGISTERS;
> +	gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, val);
> +
>  	sync_point_perfmon_sample(gpu, event, ETNA_PM_PROCESS_PRE);
>  }
>  
> @@ -1353,6 +1358,11 @@ static void
> sync_point_perfmon_sample_post(struct etnaviv_gpu *gpu,
>  		*pmr->bo_vma = pmr->sequence;
>  	}
>  
> +	/* disable debug register */
> +	val = gpu_read(gpu, VIVS_HI_CLOCK_CONTROL);
> +	val |= VIVS_HI_CLOCK_CONTROL_DISABLE_DEBUG_REGISTERS;
> +	gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, val);
> +
>  	/* enable clock gating */
>  	val = gpu_read(gpu, VIVS_PM_POWER_CONTROLS);
>  	val |= VIVS_PM_POWER_CONTROLS_ENABLE_MODULE_CLOCK_GATING;