linux-kernel - Re: [PATCH 2/4] drm/bridge: dw-hdmi: Fix color space conversion detection

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Date:   Mon, 2 Mar 2020 10:26:09 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Jernej Skrabec <jernej.skrabec@...l.net>, a.hajda@...sung.com
Cc:     Laurent.pinchart@...asonboard.com, jonas@...boo.se,
        airlied@...ux.ie, daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] drm/bridge: dw-hdmi: Fix color space conversion
 detection

Hi Jernej,

On 29/02/2020 17:30, Jernej Skrabec wrote:
> Currently, is_color_space_conversion() compares not only color spaces
> but also formats. For example, function would return true if YCbCr 4:4:4
> and YCbCr 4:2:2 would be set. Obviously in that case color spaces are
> the same.
> 
> Fix that by comparing if both values represent RGB color space.
> 
> Fixes: b21f4b658df8 ("drm: imx: imx-hdmi: move imx-hdmi to bridge/dw_hdmi")
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> ---
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 24965e53d351..9d7bfb1cb213 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -956,7 +956,8 @@ static void hdmi_video_sample(struct dw_hdmi *hdmi)
>  
>  static int is_color_space_conversion(struct dw_hdmi *hdmi)
>  {
> -	return hdmi->hdmi_data.enc_in_bus_format != hdmi->hdmi_data.enc_out_bus_format;
> +	return hdmi_bus_fmt_is_rgb(hdmi->hdmi_data.enc_in_bus_format) !=
> +		hdmi_bus_fmt_is_rgb(hdmi->hdmi_data.enc_out_bus_format);
>  }
>  
>  static int is_color_space_decimation(struct dw_hdmi *hdmi)
> 

I think in this case you should also fix the CEC enablement to:
if (is_color_space_conversion(hdmi) || is_color_space_decimation(hdmi))

in dw_hdmi_enable_video_path() otherwise CSC won't be enabled and will be bypassed
in decimation case only.

Neil