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Received: from AM7PR04MB7046.eurprd04.prod.outlook.com (2603:10a6:20b:113::22) by AS8PR04MB9189.eurprd04.prod.outlook.com (2603:10a6:20b:44c::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8069.18; Thu, 17 Oct 2024 09:53:31 +0000 Received: from AM7PR04MB7046.eurprd04.prod.outlook.com ([fe80::d1ce:ea15:6648:6f90]) by AM7PR04MB7046.eurprd04.prod.outlook.com ([fe80::d1ce:ea15:6648:6f90%4]) with mapi id 15.20.8069.016; Thu, 17 Oct 2024 09:53:30 +0000 Message-ID: <1360191c-de5f-49eb-8085-afebcb0a1c97@nxp.com> Date: Thu, 17 Oct 2024 17:53:55 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 6/9] drm/bridge: Add ITE IT6263 LVDS to HDMI converter To: Dmitry Baryshkov , Biju Das Cc: "dri-devel@lists.freedesktop.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "imx@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , "andrzej.hajda@intel.com" , "neil.armstrong@linaro.org" , "rfoss@kernel.org" , "laurent.pinchart" , "jonas@kwiboo.se" , "jernej.skrabec@gmail.com" , "airlied@gmail.com" , "simona@ffwll.ch" , "maarten.lankhorst@linux.intel.com" , "mripard@kernel.org" , "tzimmermann@suse.de" , "robh@kernel.org" , "krzk+dt@kernel.org" , "conor+dt@kernel.org" , "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" , "festevam@gmail.com" , "catalin.marinas@arm.com" , "will@kernel.org" , "quic_bjorande@quicinc.com" , "geert+renesas@glider.be" , "arnd@arndb.de" , "nfraprado@collabora.com" , "o.rempel@pengutronix.de" , "y.moog@phytec.de" , "marex@denx.de" , "isaac.scott@ideasonboard.com" References: <20241012073543.1388069-1-victor.liu@nxp.com> <20241012073543.1388069-7-victor.liu@nxp.com> <73k57zpmbbaup37iaoi7lejp6hq3af3nn5amt2bhbe7fpx4m22@n62lid6hw2cl> From: Liu Ying Content-Language: en-US In-Reply-To: <73k57zpmbbaup37iaoi7lejp6hq3af3nn5amt2bhbe7fpx4m22@n62lid6hw2cl> Content-Type: text/plain; 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>>> >>> Use drm_atomic_helper_connector_hdmi_check(). >>> >>> Implement .hdmi_tmds_char_rate_valid(). Also, I think, single and dual link LVDS have different max >>> clock rates. Please correct me if I'm wrong. >> >> I guess this rate will be same for both links in dual lvds mode. >> For single link, it supports only link0. >> We cannot operate link1 its Own. >> >> From ITE point the max rate is rate corresponding to 1080p(148-150MHz) >> >> single and dual link LVDS have different max clock rates, but that constraint is >> in SoC side?? ITE HW manual does not mention about this. > > Huh? I checked the datasheet, version 0.8. > It specifies LVDS clock rate (not the mode clock) up to 150 MHz and HDMI The datasheet says "Features(LVDS RX) * Support input clock rate up to 150MHz". The 150MHz is the mode clock rate which kind of matches the words "Features(Combined) * Support up to Full-HD/1080P and UXGA(1600x 1200) display format". LVDS serial clock rate is either x7 or x3.5 the mode clock rate, depending on single link or dual link. > rate up to 225 MHz. Please check both constraints. Will check both constraints. [...] >>>> + it->bridge.ops = DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_DETECT; >>> >>> | DRM_BRIDGE_OP_HDMI >>> >>> BTW: No HPD IRQ support? >> >> Renesas SMARC RZ/G3E this signal is internal. No dedicted IRQ line >> Populated for this signal. I don't know about NXP and any other platforms >> has HPD wired to test the HPD IRQ support. >> >> Maybe go with poll method now and add hot plug support, >> when we have platform with HPD to test. > > I'm fine with this. According to the datasheet it doesn't seem to have > the IRQ pin at all. It's just surprising to me. It's be nice to mention > that HW doesn't support HPD IRQ either before setting it->bridge.ops or > in the commit message. Will mention this before setting it->bridge.ops. -- Regards, Liu Ying