Re: [PATCH v3 07/10] drm: rcar-du: Skip LVDS1 output on Gen3 when using dual-link LVDS mode

[Sam Ravnborg <sam@ravnborg.org>]

Hi Laurent.

On Tue, May 28, 2019 at 05:12:31PM +0300, Laurent Pinchart wrote:
> In dual-link LVDS mode, the LVDS1 encoder is used as a companion for
> LVDS0, and both encoders transmit data from DU0. The LVDS1 output of DU1
> can't be used in that case, don't create an encoder and connector for
> it.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> Tested-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
> Changess since v2:
> 
> - Remove unneeded bridge NULL check
> ---
>  drivers/gpu/drm/rcar-du/rcar_du_encoder.c | 12 ++++++++++++
>  drivers/gpu/drm/rcar-du/rcar_du_kms.c     |  2 +-
>  2 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
> index 6c91753af7bc..0f00bdfe2366 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
> @@ -16,6 +16,7 @@
>  #include "rcar_du_drv.h"
>  #include "rcar_du_encoder.h"
>  #include "rcar_du_kms.h"
> +#include "rcar_lvds.h"
>  
>  /* -----------------------------------------------------------------------------
>   * Encoder
> @@ -97,6 +98,17 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
>  		}
>  	}
>  
> +	/*
> +	 * On Gen3 skip the LVDS1 output if the LVDS1 encoder is used as a
> +	 * companion for LVDS0 in dual-link mode.
> +	 */
> +	if (rcdu->info->gen >= 3 && output == RCAR_DU_OUTPUT_LVDS1) {

Both subject and comment above says "On Gen3", but the code looks like
it implements "On Gen3 or newer" - due to use of ">=".
Looks wrong to me.

	Sam
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