linux-kernel - Re: [PATCH 2/2] drm/bridge: synopsys: Add DW HDMI QP TX Controller driver

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Message-ID: <2c9099b1-f742-4092-90d0-24aba51fc198@kernel.org>
Date: Thu, 1 Aug 2024 16:17:30 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
 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>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Heiko Stübner <heiko@...ech.de>,
 Andy Yan <andy.yan@...k-chips.com>, Alexandre ARNOUD <aarnoud@...com>,
 Luis de Arquer <ldearquer@...il.com>, Algea Cao <algea.cao@...k-chips.com>
Subject: Re: [PATCH 2/2] drm/bridge: synopsys: Add DW HDMI QP TX Controller
 driver

On 01/08/2024 11:43, Cristian Ciocaltea wrote:
> On 8/1/24 11:50 AM, Krzysztof Kozlowski wrote:
>> On 01/08/2024 04:05, Cristian Ciocaltea wrote:
>>> The Synopsys DesignWare HDMI 2.1 Quad-Pixel (QP) TX Controller supports
>>> the following features, among others:
>>
>> ...
>>
>>> +
>>> +void dw_hdmi_qp_unbind(struct dw_hdmi_qp *hdmi)
>>> +{
>>> +}
>>> +EXPORT_SYMBOL_GPL(dw_hdmi_qp_unbind);
>>
>> This looks like quite useless export. Drop.
>>
>>
>>> +
>>> +void dw_hdmi_qp_resume(struct device *dev, struct dw_hdmi_qp *hdmi)
>>> +{
>>> +	dw_hdmi_qp_init_hw(hdmi);
>>> +}
>>> +EXPORT_SYMBOL_GPL(dw_hdmi_qp_resume);
>>> +
>>> +MODULE_AUTHOR("Algea Cao <algea.cao@...k-chips.com>");
>>> +MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@...labora.com>");
>>> +MODULE_DESCRIPTION("DW HDMI QP transmitter driver");
>>> +MODULE_LICENSE("GPL");
>>> +MODULE_ALIAS("platform:dw-hdmi-qp");
>>
>> That's not a platform driver. That does not look like driver at all,
>> just some helper code without any user
> 
> This is actually used to provide RK3588 HDMI output support:
> 
> https://lore.kernel.org/lkml/20240801-b4-rk3588-bridge-upstream-v2-3-9fa657a4e15b@collabora.com/

That is supposed to be in one patchset, so we can see how you use the
introduced functions.


Best regards,
Krzysztof