linux-kernel - Re: [PATCH v3 07/15] drm/connector: hdmi: Use YUV420 output format as an RGB fallback

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Message-ID: <38e67224-d478-42c1-91d4-ba6cdd473227@collabora.com>
Date: Thu, 10 Apr 2025 13:08:35 +0300
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Maxime Ripard <mripard@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>,
 Dave Stevenson <dave.stevenson@...pberrypi.com>,
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, kernel@...labora.com,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 07/15] drm/connector: hdmi: Use YUV420 output format as
 an RGB fallback

On 4/9/25 6:09 PM, Maxime Ripard wrote:
> On Wed, Mar 26, 2025 at 12:19:56PM +0200, Cristian Ciocaltea wrote:
>> Try to make use of YUV420 when computing the best output format and
>> RGB cannot be supported for any of the available color depths.
>>
>> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
>> ---
>>  drivers/gpu/drm/display/drm_hdmi_state_helper.c | 10 ++++++++++
>>  1 file changed, 10 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
>> index 6de0abb15ecb36fd4eb98725e2a3835e5e0db134..3859600c6af4a79f30858adfc9f9a710dfe561a5 100644
>> --- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
>> +++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
>> @@ -650,7 +650,17 @@ hdmi_compute_config(const struct drm_connector *connector,
>>  
>>  	ret = hdmi_compute_format_bpc(connector, conn_state, mode, max_bpc,
>>  				      HDMI_COLORSPACE_RGB);
>> +	if (!ret)
>> +		return 0;
>>  
>> +	if (!connector->ycbcr_420_allowed) {
>> +		drm_dbg_kms(connector->dev,
>> +			    "YUV420 output format not allowed for connector.\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	ret = hdmi_compute_format_bpc(connector, conn_state, mode, max_bpc,
>> +				      HDMI_COLORSPACE_YUV420);
>>  	return ret;
> 
> I think I'd prefer to log a debug message there and return 0 if it
> succeeds, something like

Sure, will do.

> ret = hdmi_compute_format_bpc(..)
> if (ret) {
>    drm_dbg("YUV420 doesn't work").
>    return ret;
> }
> 
> return 0;