linux-kernel - Re: [PATCH 3/7] drm/bridge: ite-it6232: declare supported infoframes

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Message-ID: <185e3a1f-0d84-460f-a9b3-bc4bdc13e543@nxp.com>
Date: Wed, 20 Aug 2025 11:28:14 +0800
From: Liu Ying <victor.liu@....com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.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>, Simona Vetter <simona@...ll.ch>,
 Sandy Huang <hjc@...k-chips.com>, Heiko Stübner
 <heiko@...ech.de>, Andy Yan <andy.yan@...k-chips.com>,
 Chen-Yu Tsai <wens@...e.org>, Samuel Holland <samuel@...lland.org>,
 Dave Stevenson <dave.stevenson@...pberrypi.com>,
 Maíra Canal <mcanal@...lia.com>,
 Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>,
 Rob Clark <robin.clark@....qualcomm.com>, Dmitry Baryshkov
 <lumag@...nel.org>, Abhinav Kumar <abhinav.kumar@...ux.dev>,
 Jessica Zhang <jessica.zhang@....qualcomm.com>, Sean Paul <sean@...rly.run>,
 Marijn Suijten <marijn.suijten@...ainline.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
 freedreno@...ts.freedesktop.org
Subject: Re: [PATCH 3/7] drm/bridge: ite-it6232: declare supported infoframes

On 08/19/2025, Dmitry Baryshkov wrote:
> On 19/08/2025 12:49, Liu Ying wrote:
>> Hi Dmitry,
>>
>> On 08/16/2025, Dmitry Baryshkov wrote:
>>> Declare which infoframes are supported via the .hdmi_write_infoframe()
>>> interface.
>>>
>>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
>>> ---
>>>   drivers/gpu/drm/bridge/ite-it6263.c | 1 +
>>>   1 file changed, 1 insertion(+)
>>
>> For subject, s/it6232/it6263.
> 
> Ack
> 
>>
>>>
>>> diff --git a/drivers/gpu/drm/bridge/ite-it6263.c b/drivers/gpu/drm/bridge/ite-it6263.c
>>> index cf813672b4ffb8ab5c524c6414ee7b414cebc018..b1956891a8388401c13cd2fc5c78f0779063adf4 100644
>>> --- a/drivers/gpu/drm/bridge/ite-it6263.c
>>> +++ b/drivers/gpu/drm/bridge/ite-it6263.c
>>> @@ -875,6 +875,7 @@ static int it6263_probe(struct i2c_client *client)
>>>       it->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
>>>       it->bridge.vendor = "ITE";
>>>       it->bridge.product = "IT6263";
>>> +    it->bridge.supported_infoframes = DRM_CONNECTOR_INFOFRAME_AVI;
>>
>> With supported_infoframes set, the two lines setting vendor and product
>> are dead code.  I think it's worth dropping them and updating kerneldoc
>> for vendor and product members because they don't have to be required if
>> DRM_BRIDGE_OP_HDMI is set.  But, this could be done with future patch(not
>> in this patch series).
> 
> They are still required by the framework itself, see drmm_connector_hdmi_init().

Yes.  But it's a bit too strict since SPD infoframe is optional according
to CTA standard documentation.

> 
> BTW: I don't have ITE datasheet. Do you know if it really supports only the AVI frame?

AFAICS, it seems that ITE6263 supports inforframes from 0x81 to 0x85, so
including SPD inforframe.  Maybe, just keep those dead vendor&product
settings for now and add SPD inforframe in future.

> 
> 
>>
>> Reviewed-by: Liu Ying <victor.liu@....com>
>>
>>>         return devm_drm_bridge_add(dev, &it->bridge);
>>>   }
>>>
>>
>>
> 
> 


-- 
Regards,
Liu Ying