Fwd: [PATCH v5 2/6] drm/rockchip: dw_hdmi: Allow outputs that don't need output switching

[Zheng Yang]

Hi, Heiko:

Hi, Heiko:

Hi, Heiko:

Reviewed-by: zhengyang <zhengyang at rock-chips.com>

>
> So far we always encountered socs with 2 output crtcs needing the driver
> to tell the hdmi block which output to connect to. But there also exist
> socs with only one crtc like the rk3228, rk3328 and rk3368.
>
> So adapt the register field to simply carry a negative value to signal
> that no output-switching is necessary.
>
> Signed-off-by: Heiko Stuebner <heiko at sntech.de>
> Tested-by: Robin Murphy <robin.murphy at arm.com>
>
> changes in v3:
> - fixed wording issue found by Robin Murphy
> ---
>  drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c 
> b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> index 11309a2a4e43..b09c3531305b 100644
> --- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> @@ -36,7 +36,7 @@
>   * @lcdsel_lit: reg value of selecting vop little for HDMI
>   */
>  struct rockchip_hdmi_chip_data {
> -    u32    lcdsel_grf_reg;
> +    int    lcdsel_grf_reg;
>      u32    lcdsel_big;
>      u32    lcdsel_lit;
>  };
> @@ -245,6 +245,9 @@ static void dw_hdmi_rockchip_encoder_enable(struct 
> drm_encoder *encoder)
>      u32 val;
>      int ret;
>  +    if (hdmi->chip_data->lcdsel_grf_reg < 0)
> +        return;
> +
>      ret = drm_of_encoder_active_endpoint_id(hdmi->dev->of_node, 
> encoder);
>      if (ret)
>          val = hdmi->chip_data->lcdsel_lit;