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[PATCH v4 05/10] drm/bridge: dw-hdmi-qp: Set bridge supported_formats

Nicolas Frattaroli posted 10 patches 2 weeks ago
There is a newer version of this series
[PATCH v4 05/10] drm/bridge: dw-hdmi-qp: Set bridge supported_formats
Posted by Nicolas Frattaroli 2 weeks ago 
The drm_bridge "supported_formats" member stores a bitmask of supported
HDMI output formats if the bridge is in fact an HDMI bridge.

However, until now, the synopsys dw-hdmi-qp driver did not set this
member in the bridge it creates.

Set it based on the platform data's supported_formats member, and
default to BIT(HDMI_COLORSPACE_RGB) if it's absent, which preserves the
previous behaviour.

Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
index fe4c026280f0..cf888236bd65 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
@@ -1269,6 +1269,11 @@ struct dw_hdmi_qp *dw_hdmi_qp_bind(struct platform_device *pdev,
 		dev_warn(dev, "Set ref_clk_rate to vendor default\n");
 	}
 
+	if (plat_data->supported_formats)
+		hdmi->bridge.supported_formats = plat_data->supported_formats;
+	else
+		hdmi->bridge.supported_formats = BIT(HDMI_COLORSPACE_RGB);
+
 	dw_hdmi_qp_init_hw(hdmi);
 
 	ret = devm_request_threaded_irq(dev, plat_data->main_irq,

-- 
2.51.2
Re: [PATCH v4 05/10] drm/bridge: dw-hdmi-qp: Set bridge supported_formats
Posted by Laurent Pinchart 1 week, 5 days ago 
On Mon, Nov 17, 2025 at 08:11:49PM +0100, Nicolas Frattaroli wrote:
> The drm_bridge "supported_formats" member stores a bitmask of supported
> HDMI output formats if the bridge is in fact an HDMI bridge.

It would be nice to convert the supported_formats field to a bitmask of
DRM_MODE_COLOR_FORMAT_* values.

> 
> However, until now, the synopsys dw-hdmi-qp driver did not set this
> member in the bridge it creates.
> 
> Set it based on the platform data's supported_formats member, and
> default to BIT(HDMI_COLORSPACE_RGB) if it's absent, which preserves the
> previous behaviour.
> 
> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
> ---
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
> index fe4c026280f0..cf888236bd65 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
> @@ -1269,6 +1269,11 @@ struct dw_hdmi_qp *dw_hdmi_qp_bind(struct platform_device *pdev,
>  		dev_warn(dev, "Set ref_clk_rate to vendor default\n");
>  	}
>  
> +	if (plat_data->supported_formats)
> +		hdmi->bridge.supported_formats = plat_data->supported_formats;
> +	else
> +		hdmi->bridge.supported_formats = BIT(HDMI_COLORSPACE_RGB);
> +
>  	dw_hdmi_qp_init_hw(hdmi);
>  
>  	ret = devm_request_threaded_irq(dev, plat_data->main_irq,

-- 
Regards,

Laurent Pinchart
Re: [PATCH v4 05/10] drm/bridge: dw-hdmi-qp: Set bridge supported_formats
Posted by Cristian Ciocaltea 1 week, 6 days ago 
Hi Nicolas,

On 11/17/25 9:11 PM, Nicolas Frattaroli wrote:
> The drm_bridge "supported_formats" member stores a bitmask of supported
> HDMI output formats if the bridge is in fact an HDMI bridge.
> 
> However, until now, the synopsys dw-hdmi-qp driver did not set this
> member in the bridge it creates.
> 
> Set it based on the platform data's supported_formats member, and
> default to BIT(HDMI_COLORSPACE_RGB) if it's absent, which preserves the
> previous behaviour.
> 
> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
> ---
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
> index fe4c026280f0..cf888236bd65 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
> @@ -1269,6 +1269,11 @@ struct dw_hdmi_qp *dw_hdmi_qp_bind(struct platform_device *pdev,
>  		dev_warn(dev, "Set ref_clk_rate to vendor default\n");
>  	}
>  
> +	if (plat_data->supported_formats)
> +		hdmi->bridge.supported_formats = plat_data->supported_formats;

This duplicates a change already introduced via commit 1ff27c5929ab
("drm/bridge: dw-hdmi-qp: Handle platform supported formats and color depth").

> +	else
> +		hdmi->bridge.supported_formats = BIT(HDMI_COLORSPACE_RGB);

And this one looks redundant as well, since RGB is supposed to be mandatory:
supported_formats defaults to RGB in drm_bridge_connector_init() if there's no
HDMI bridge in the pipeline overriding it, while drmm_connector_hdmi_init()
errors out if supported_formats is unset or doesn't advertise RGB.

Hence I think this patch can be dropped.

Regards,
Cristian
Re: [PATCH v4 05/10] drm/bridge: dw-hdmi-qp: Set bridge supported_formats
Posted by Nicolas Frattaroli 1 week, 5 days ago 
On Tuesday, 18 November 2025 21:00:08 Central European Standard Time Cristian Ciocaltea wrote:
> Hi Nicolas,
> 
> On 11/17/25 9:11 PM, Nicolas Frattaroli wrote:
> > The drm_bridge "supported_formats" member stores a bitmask of supported
> > HDMI output formats if the bridge is in fact an HDMI bridge.
> > 
> > However, until now, the synopsys dw-hdmi-qp driver did not set this
> > member in the bridge it creates.
> > 
> > Set it based on the platform data's supported_formats member, and
> > default to BIT(HDMI_COLORSPACE_RGB) if it's absent, which preserves the
> > previous behaviour.
> > 
> > Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
> > ---
> >  drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
> > index fe4c026280f0..cf888236bd65 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
> > @@ -1269,6 +1269,11 @@ struct dw_hdmi_qp *dw_hdmi_qp_bind(struct platform_device *pdev,
> >  		dev_warn(dev, "Set ref_clk_rate to vendor default\n");
> >  	}
> >  
> > +	if (plat_data->supported_formats)
> > +		hdmi->bridge.supported_formats = plat_data->supported_formats;
> 
> This duplicates a change already introduced via commit 1ff27c5929ab
> ("drm/bridge: dw-hdmi-qp: Handle platform supported formats and color depth").

Hmm, looks like I didn't notice that when rebasing onto next-20251117.

(Aside note, that commit is once again lacking from next-20251119,
did it get dropped for some reason or did DRM as a whole not get
pulled into that next version due to a conflict?)

> 
> > +	else
> > +		hdmi->bridge.supported_formats = BIT(HDMI_COLORSPACE_RGB);
> 
> And this one looks redundant as well, since RGB is supposed to be mandatory:
> supported_formats defaults to RGB in drm_bridge_connector_init() if there's no
> HDMI bridge in the pipeline overriding it, while drmm_connector_hdmi_init()
> errors out if supported_formats is unset or doesn't advertise RGB.

Oops, yeah you're right

> 
> Hence I think this patch can be dropped.

Will do! Thanks for the quick review

> 
> Regards,
> Cristian
> 
>

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