From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
To: Jayesh Choudhary <j-choudhary@ti.com>,
dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: andrzej.hajda@intel.com, neil.armstrong@linaro.org,
rfoss@kernel.org, Laurent.pinchart@ideasonboard.com,
jonas@kwiboo.se, jernej.skrabec@gmail.com, airlied@gmail.com,
daniel@ffwll.ch, robh+dt@kernel.org,
krzysztof.kozlowski+dt@linaro.org, sam@ravnborg.org,
jani.nikula@intel.com, tzimmermann@suse.de, javierm@redhat.com,
ville.syrjala@linux.intel.com, r-ravikumar@ti.com,
lyude@redhat.com, alexander.deucher@amd.com,
sjakhade@cadence.com, yamonkar@cadence.com, a-bhatia1@ti.com
Subject: Re: [PATCH 1/2] dt-bindings: drm/bridge: Add no-hpd property
Date: Tue, 21 Mar 2023 13:38:06 +0100 [thread overview]
Message-ID: <55cfacf6-03e0-b9bc-83f3-3e9f2d7b2d4d@linaro.org> (raw)
In-Reply-To: <79ce5fe8-9fb0-5caa-67a0-87dee7867856@ti.com>
On 21/03/2023 13:02, Jayesh Choudhary wrote:
>>
>>> + type: boolean
>>> + description:
>>> + Set if the HPD line on the bridge isn't hooked up to anything or is
>>> + otherwise unusable.
>>
>> It's the property of the panel, not bridge. Unless you want to say that
>> bridge physically does not have HPD? Does it follow the standard in such
>> case?
>
> MHDP does have hpd. But the mhdp driver should handle the cases when the
This is about bindings, not driver. Your driver can still handle this as
it wishes.
> hpd pin of bridge is not connected to that of the DP-connector. This is
> to add support for that. (optional property)
Which is indicated by panel no-hpd, right? Or you mean now that HPD
physically cannot go to panel because it is cut on the bridge side? But
isn't this the same case (from hardware/bindings point, not driver) as
panel would not have HPD?
Best regards,
Krzysztof
next prev parent reply other threads:[~2023-03-21 12:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-16 14:08 [PATCH 0/2] "no-hpd" support in CDNS DP bridge driver Jayesh Choudhary
2023-03-16 14:08 ` [PATCH 1/2] dt-bindings: drm/bridge: Add no-hpd property Jayesh Choudhary
2023-03-17 12:38 ` Krzysztof Kozlowski
2023-03-21 12:02 ` Jayesh Choudhary
2023-03-21 12:38 ` Krzysztof Kozlowski [this message]
2023-03-21 14:28 ` Jayesh Choudhary
2023-03-21 15:17 ` Krzysztof Kozlowski
2023-03-23 12:26 ` Jayesh Choudhary
2023-03-16 14:08 ` [PATCH 2/2] drm: bridge: cdns-mhdp8546: Add support for no-hpd Jayesh Choudhary
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