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([2a02:810d:15c0:828:dad2:72b7:3626:af61]) by smtp.gmail.com with ESMTPSA id r14-20020a170906364e00b0094a82a236cbsm1860935ejb.129.2023.04.10.23.06.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Apr 2023 23:06:42 -0700 (PDT) Message-ID: <6ba8bbcf-0d72-4bb9-a014-85e9f3e22cdb@linaro.org> Date: Tue, 11 Apr 2023 08:06:41 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.9.1 Subject: Re: [PATCH v2 1/2] dt-bindings: drm/bridge: Add no-hpd property Content-Language: en-US To: Jayesh Choudhary , 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, tomi.valkeinen@ideasonboard.com References: <20230405142440.191939-1-j-choudhary@ti.com> <20230405142440.191939-2-j-choudhary@ti.com> From: Krzysztof Kozlowski In-Reply-To: <20230405142440.191939-2-j-choudhary@ti.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On 05/04/2023 16:24, Jayesh Choudhary wrote: > From: Rahul T R > > The mhdp bridge can work without its HPD pin hooked up to the connector, > but the current bridge driver throws an error when hpd line is not > connected to the connector. For such cases, we need an indication for > no-hpd, using which we can bypass the hpd detection and instead use the > auxiliary channels connected to the DP connector to confirm the > connection. > So add no-hpd property to the bindings, to disable hpd when not > connected or unusable. Your subject prefixes miss device specific part. You do not add no-hpd to all bridges. It's also not drm. It is a display directory. > > Signed-off-by: Rahul T R > Signed-off-by: Jayesh Choudhary > --- > .../devicetree/bindings/display/bridge/cdns,mhdp8546.yaml | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml > index c2b369456e4e..3a6c6d837593 100644 > --- a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml > +++ b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml > @@ -57,6 +57,12 @@ properties: > interrupts: > maxItems: 1 > > + cdns,no-hpd: No improvements - use existing no-hpd name. Best regards, Krzysztof