[PATCH v4 5/5] drm: rcar-du: dsi: Fix VCLKSET write

[Laurent Pinchart]

Hi Tomi,

Thank you for the patch.

On Wed, Aug 24, 2022 at 03:47:26PM +0300, Tomi Valkeinen wrote:
> From: Tomi Valkeinen <tomi.valkeinen+renesas at ideasonboard.com>
> 
> rcar_mipi_dsi_startup() writes correct values to VCLKSET, but as it uses
> or-operation to add the new values to the current value in the register,
> it should first make sure the fields are cleared.
> 
> Do this by using rcar_mipi_dsi_write() to write the VCLKSET register
> with a variable that has all the unused bits zeroed.
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas at ideasonboard.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>

> ---
>  drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> index 06250f2f3499..90128d5e3d17 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> @@ -414,7 +414,7 @@ static int rcar_mipi_dsi_startup(struct rcar_mipi_dsi *dsi,
>  
>  	/* Enable DOT clock */
>  	vclkset = VCLKSET_CKEN;
> -	rcar_mipi_dsi_set(dsi, VCLKSET, vclkset);
> +	rcar_mipi_dsi_write(dsi, VCLKSET, vclkset);
>  
>  	if (dsi_format == 24)
>  		vclkset |= VCLKSET_BPP_24;
> @@ -429,7 +429,7 @@ static int rcar_mipi_dsi_startup(struct rcar_mipi_dsi *dsi,
>  	vclkset |= VCLKSET_COLOR_RGB | VCLKSET_DIV(setup_info.div)
>  		|  VCLKSET_LANE(dsi->lanes - 1);
>  
> -	rcar_mipi_dsi_set(dsi, VCLKSET, vclkset);
> +	rcar_mipi_dsi_write(dsi, VCLKSET, vclkset);
>  
>  	/* After setting VCLKSET register, enable VCLKEN */
>  	rcar_mipi_dsi_set(dsi, VCLKEN, VCLKEN_CKEN);

-- 
Regards,

Laurent Pinchart