Re: [PATCH] drm: atmel-hlcdc: update the LCDC_ATTRE register in plane atomic_disable

[Nicolas Ferre <nicolas.ferre@microchip.com>]

On 14/10/2024 at 08:46, Manikandan Muralidharan wrote:
> update the LCDC_ATTRE register in drm plane atomic_disable to handle
> the configuration changes of each layer when a plane is disabled.
> 
> Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>

Reviewed-by: Nicolas Ferre <nicolas.ferre@microchip.com>

Thanks Mani. Best regards,
   Nicolas

> ---
>   drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h    |  3 ++-
>   drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 17 ++++++++++++++---
>   2 files changed, 16 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> index e1a0bb24b511..53d47f01db0b 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> @@ -378,7 +378,8 @@ struct atmel_lcdc_dc_ops {
>   	void (*lcdc_update_buffers)(struct atmel_hlcdc_plane *plane,
>   				    struct atmel_hlcdc_plane_state *state,
>   				    u32 sr, int i);
> -	void (*lcdc_atomic_disable)(struct atmel_hlcdc_plane *plane);
> +	void (*lcdc_atomic_disable)(struct atmel_hlcdc_plane *plane,
> +				    struct atmel_hlcdc_dc *dc);
>   	void (*lcdc_update_general_settings)(struct atmel_hlcdc_plane *plane,
>   					     struct atmel_hlcdc_plane_state *state);
>   	void (*lcdc_atomic_update)(struct atmel_hlcdc_plane *plane,
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> index 4a7ba0918eca..4bcaf2cd7672 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> @@ -816,7 +816,8 @@ static int atmel_hlcdc_plane_atomic_check(struct drm_plane *p,
>   	return 0;
>   }
>   
> -static void atmel_hlcdc_atomic_disable(struct atmel_hlcdc_plane *plane)
> +static void atmel_hlcdc_atomic_disable(struct atmel_hlcdc_plane *plane,
> +				       struct atmel_hlcdc_dc *dc)
>   {
>   	/* Disable interrupts */
>   	atmel_hlcdc_layer_write_reg(&plane->layer, ATMEL_HLCDC_LAYER_IDR,
> @@ -832,7 +833,8 @@ static void atmel_hlcdc_atomic_disable(struct atmel_hlcdc_plane *plane)
>   	atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_HLCDC_LAYER_ISR);
>   }
>   
> -static void atmel_xlcdc_atomic_disable(struct atmel_hlcdc_plane *plane)
> +static void atmel_xlcdc_atomic_disable(struct atmel_hlcdc_plane *plane,
> +				       struct atmel_hlcdc_dc *dc)
>   {
>   	/* Disable interrupts */
>   	atmel_hlcdc_layer_write_reg(&plane->layer, ATMEL_XLCDC_LAYER_IDR,
> @@ -842,6 +844,15 @@ static void atmel_xlcdc_atomic_disable(struct atmel_hlcdc_plane *plane)
>   	atmel_hlcdc_layer_write_reg(&plane->layer,
>   				    ATMEL_XLCDC_LAYER_ENR, 0);
>   
> +	/*
> +	 * Updating XLCDC_xxxCFGx, XLCDC_xxxFBA and XLCDC_xxxEN,
> +	 * (where xxx indicates each layer) requires writing one to the
> +	 * Update Attribute field for each layer in LCDC_ATTRE register for SAM9X7.
> +	 */
> +	regmap_write(dc->hlcdc->regmap, ATMEL_XLCDC_ATTRE, ATMEL_XLCDC_BASE_UPDATE |
> +		     ATMEL_XLCDC_OVR1_UPDATE | ATMEL_XLCDC_OVR3_UPDATE |
> +		     ATMEL_XLCDC_HEO_UPDATE);
> +
>   	/* Clear all pending interrupts */
>   	atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_XLCDC_LAYER_ISR);
>   }
> @@ -852,7 +863,7 @@ static void atmel_hlcdc_plane_atomic_disable(struct drm_plane *p,
>   	struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
>   	struct atmel_hlcdc_dc *dc = plane->base.dev->dev_private;
>   
> -	dc->desc->ops->lcdc_atomic_disable(plane);
> +	dc->desc->ops->lcdc_atomic_disable(plane, dc);
>   }
>   
>   static void atmel_hlcdc_atomic_update(struct atmel_hlcdc_plane *plane,