linux-kernel - Re: [PATCH] drm: bridge: dw-hdmi: fix input format/encoding from plat

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Date:   Fri, 7 Apr 2017 14:02:06 +0530
From:   Archit Taneja <architt@...eaurora.org>
To:     Neil Armstrong <narmstrong@...libre.com>,
        dri-devel@...ts.freedesktop.org
Cc:     laurent.pinchart+renesas@...asonboard.com, Jose.Abreu@...opsys.com,
        linux-kernel@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH] drm: bridge: dw-hdmi: fix input format/encoding from
 plat_data



On 04/06/2017 03:04 PM, Neil Armstrong wrote:
> The plat_data->input_bus_format and plat_data->input_bus_encoding
> are unsigned long and are alsways >=0, but the value 0 was still

s/alsways/always

> considered as RGB888 like the default behaviour.

Is RGB888 default behaviour for plat_data->input_bus_encoding too?
You might want to rephrase it as the "default color space", or
something along those lines.
>
> This patch changes the if test to > 0.

The change technically makes the if statement check for a
non-zero value.

Reviewed-by: Archit Taneja <architt@...eaurora.org>

Feel free to push to drm-misc after updating the commit message.

Thanks,
Archit

>
> Thanks to Dan Carpenter for his bug report at [1].
>
> Tested on Amlogic P230 (with CSC enabled for YUV444 to RGB) and Rockchip
> RK3288 ACT8846 EVB Board (no CSC involved, direct RGB passthrough).
>
> [1] http://lkml.kernel.org/r/20170406052120.GA26578@mwanda
>
> Cc: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 8b60503..100e1ee 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -1668,14 +1668,14 @@ static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
>  	hdmi->hdmi_data.video_mode.mpixelrepetitioninput = 0;
>
>  	/* TOFIX: Get input format from plat data or fallback to RGB888 */
> -	if (hdmi->plat_data->input_bus_format >= 0)
> +	if (hdmi->plat_data->input_bus_format)
>  		hdmi->hdmi_data.enc_in_bus_format =
>  			hdmi->plat_data->input_bus_format;
>  	else
>  		hdmi->hdmi_data.enc_in_bus_format = MEDIA_BUS_FMT_RGB888_1X24;
>
>  	/* TOFIX: Get input encoding from plat data or fallback to none */
> -	if (hdmi->plat_data->input_bus_encoding >= 0)
> +	if (hdmi->plat_data->input_bus_encoding)
>  		hdmi->hdmi_data.enc_in_encoding =
>  			hdmi->plat_data->input_bus_encoding;
>  	else
>

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