linux-kernel - Re: [RFC/RFT PATCH 3/4] drm/bridge: dw-hdmi: Enable CSC even for DVI

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Message-ID: <888e2dfb-db21-04b5-90d3-9f917052f70a@synopsys.com>
Date:   Wed, 18 Jan 2017 10:22:24 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        <dri-devel@...ts.freedesktop.org>,
        <laurent.pinchart+renesas@...asonboard.com>
CC:     <Jose.Abreu@...opsys.com>, <kieran.bingham@...asonboard.com>,
        <linux-amlogic@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC/RFT PATCH 3/4] drm/bridge: dw-hdmi: Enable CSC even for DVI

Hi Neil,


On 17-01-2017 12:31, Neil Armstrong wrote:
> If the input pixel format is not RGB, the CSC must be enabled in order to
> provide valid pixel to DVI sinks.
> This patch removes the hdmi only dependency on the CSC enabling.
>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>

I was going to say that you should make sure the output
colorspace is RGB or else DVI will fail to work, but I just
noticed the output colorspace is fixed in the code to RGB.
Though, that may change in the future.

Reviewed-by: Jose Abreu <joabreu@...opsys.com>

Best regards,
Jose Miguel Abreu

> ---
>  drivers/gpu/drm/bridge/dw-hdmi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/dw-hdmi.c b/drivers/gpu/drm/bridge/dw-hdmi.c
> index 923e250..8a6a183 100644
> --- a/drivers/gpu/drm/bridge/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/dw-hdmi.c
> @@ -1331,8 +1331,8 @@ static void dw_hdmi_enable_video_path(struct dw_hdmi *hdmi)
>  		hdmi_writeb(hdmi, clkdis, HDMI_MC_CLKDIS);
>  	}
>  
> -	/* Enable color space conversion if needed (for HDMI sinks only). */
> -	if (hdmi->sink_is_hdmi && is_color_space_conversion(hdmi))
> +	/* Enable color space conversion if needed */
> +	if (is_color_space_conversion(hdmi))
>  		hdmi_writeb(hdmi, HDMI_MC_FLOWCTRL_FEED_THROUGH_OFF_CSC_IN_PATH,
>  			    HDMI_MC_FLOWCTRL);
>  	else