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

From: Neil Armstrong
Date: Wed Jan 18 2017 - 06:24:38 EST


Hi jose,

On 01/18/2017 11:22 AM, Jose Abreu wrote:
> 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@xxxxxxxxxxxx>
>
> 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.

Thanks for the review,
It would certainly need to enforce RGB output colorspace when in DVI mode.

Neil

>
> Reviewed-by: Jose Abreu <joabreu@xxxxxxxxxxxx>
>
> 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
>