linux-kernel - Re: [PATCH 1/5] drm/rockchip: dw_hdmi_qp: Provide CEC IRQ in dw_hdmi_qp_plat

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Message-ID: <f02af24c-18de-4b56-85cd-da7af8a73222@collabora.com>
Date: Fri, 4 Jul 2025 17:46:33 +0300
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Heiko Stübner <heiko@...ech.de>,
 Sandy Huang <hjc@...k-chips.com>, Andy Yan <andy.yan@...k-chips.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Andrzej Hajda <andrzej.hajda@...el.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] drm/rockchip: dw_hdmi_qp: Provide CEC IRQ in
 dw_hdmi_qp_plat_data

Hi Heiko,

On 7/4/25 5:37 PM, Heiko Stübner wrote:
> Hi Cristian,
> 
> Am Freitag, 4. Juli 2025, 16:23:22 Mitteleuropäische Sommerzeit schrieb Cristian Ciocaltea:
>> In preparation to support the CEC interface of the DesignWare HDMI QP IP
>> block, extend the platform data to provide the required IRQ number.
>>
>> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
>> ---
>>  drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c | 4 ++++
>>  include/drm/bridge/dw_hdmi_qp.h                | 1 +
>>  2 files changed, 5 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
>> index 7d531b6f4c098c6c548788dad487ce4613a2f32b..126e556025961e8645f3567b4d7a1c73cc2f2e7f 100644
>> --- a/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
>> +++ b/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
>> @@ -539,6 +539,10 @@ static int dw_hdmi_qp_rockchip_bind(struct device *dev, struct device *master,
>>  	if (plat_data.main_irq < 0)
>>  		return plat_data.main_irq;
>>  
>> +	plat_data.cec_irq = platform_get_irq_byname(pdev, "cec");
>> +	if (plat_data.cec_irq < 0)
>> +		return plat_data.cec_irq;
>> +
>>  	irq = platform_get_irq_byname(pdev, "hpd");
>>  	if (irq < 0)
>>  		return irq;
>> diff --git a/include/drm/bridge/dw_hdmi_qp.h b/include/drm/bridge/dw_hdmi_qp.h
>> index e9be6d507ad9cdc55f5c7d6d3ef37eba41f1ce74..b4a9b739734ec7b67013b683fe6017551aa19172 100644
>> --- a/include/drm/bridge/dw_hdmi_qp.h
>> +++ b/include/drm/bridge/dw_hdmi_qp.h
>> @@ -23,6 +23,7 @@ struct dw_hdmi_qp_plat_data {
>>  	const struct dw_hdmi_qp_phy_ops *phy_ops;
>>  	void *phy_data;
>>  	int main_irq;
>> +	int cec_irq;
>>  };
> 
> from a structure point-of-view, I'd expect the series to be something like:
> 
> (1) drm/bridge: dw-hdmi-qp: Add CEC support
>     -> including adding the cec_irq to dw_hdmi_qp_plat_data
> (2) drm/bridge: dw-hdmi-qp: Fixup timer base setup
>     -> including adding the ref_clk_rate to dw_hdmi_qp_plat_data
> (3) drm/rockchip: dw_hdmi_qp: Provide CEC IRQ in dw_hdmi_qp_plat_data
> (4) drm/rockchip: dw_hdmi_qp: Provide ref clock rate in dw_hdmi_qp_plat_data
> (5) arm64: defconfig: Enable DW HDMI QP CEC support
> 
> The patches adding the generic functionality to the bridge should also
> include the needed elements and not depend on platform-specific patches.

You are right, that's a much better approach.

Thanks for the quick feedback!

Regards,
Cristian