[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <f656c72e-fac8-4345-9b65-1031ebe81c25@collabora.com>
Date: Wed, 5 Jun 2024 00:34:57 +0300
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Sam Ravnborg <sam@...nborg.org>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Sandy Huang <hjc@...k-chips.com>, Heiko Stübner
<heiko@...ech.de>, Andy Yan <andy.yan@...k-chips.com>,
Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Mark Yao <markyao0591@...il.com>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
devicetree@...r.kernel.org, kernel@...labora.com,
Alexandre ARNOUD <aarnoud@...com>, Luis de Arquer <ldearquer@...il.com>,
Algea Cao <algea.cao@...k-chips.com>
Subject: Re: [PATCH 13/14] drm/bridge: synopsys: Add DW HDMI QP TX controller
driver
On 6/4/24 11:41 PM, Sam Ravnborg wrote:
> Hi Cristian.
>
> On Tue, Jun 04, 2024 at 10:32:04PM +0300, Cristian Ciocaltea wrote:
>> Hi Sam,
>>
>> On 6/1/24 5:32 PM, Sam Ravnborg wrote:
>>> Hi Cristian,
>>>
>>> a few drive-by comments below.
>>>
>>> Sam
>>>
>>>
>>>> +
>>>> +static const struct drm_connector_funcs dw_hdmi_qp_connector_funcs = {
>>>> + .fill_modes = drm_helper_probe_single_connector_modes,
>>>> + .detect = dw_hdmi_connector_detect,
>>>> + .destroy = drm_connector_cleanup,
>>>> + .force = dw_hdmi_qp_connector_force,
>>>> + .reset = drm_atomic_helper_connector_reset,
>>>> + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
>>>> + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>>>> +};
>>>> +
>>>> +static int dw_hdmi_qp_bridge_attach(struct drm_bridge *bridge,
>>>> + enum drm_bridge_attach_flags flags)
>>>> +{
>>>> + struct dw_hdmi *hdmi = bridge->driver_private;
>>>> +
>>>> + if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
>>>> + return drm_bridge_attach(bridge->encoder, hdmi->next_bridge,
>>>> + bridge, flags);
>>>> +
>>>> + return dw_hdmi_connector_create(hdmi, &dw_hdmi_qp_connector_funcs);
>>>> +}
>>>
>>> Are there any users left that requires the display driver to create the
>>> connector?
>>> In other words - could this driver fail if DRM_BRIDGE_ATTACH_NO_CONNECTOR
>>> is not passed and drop dw_hdmi_connector_create()?
>>>
>>> I did not try to verify this - just a naive question.
>>
>> I've just tested this and it doesn't work - dw_hdmi_connector_create()
>> is still needed.
>
> Hmm, seems the display driver or some other bridge driver fails to
> support "DRM_BRIDGE_ATTACH_NO_CONNECTOR".
> what other drivers are involved?
Could it be related to the glue driver (updated in the next patch) which
is also responsible for setting up the encoder?
> Note that my comments here should be seen as potential future
> improvements, and do not block the patch from being used.
Thanks for the heads up! Will try to get back to this soon and investigate.
Cristian
Powered by blists - more mailing lists