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Wed, 3 Sep 2025 11:12:34 +0000 Received: from AM8PR04MB7779.eurprd04.prod.outlook.com ([fe80::7417:d17f:8d97:44d2]) by AM8PR04MB7779.eurprd04.prod.outlook.com ([fe80::7417:d17f:8d97:44d2%7]) with mapi id 15.20.9094.015; Wed, 3 Sep 2025 11:12:34 +0000 Message-ID: <4fa96259-5dfd-485f-ab41-c039f4a1f23c@topic.nl> Date: Wed, 3 Sep 2025 13:12:33 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 1/2] dt-bindings: drm/bridge: ti-tmds181: Add TI TMDS181 and SN65DP159 bindings From: Mike Looijmans To: Maxime Ripard CC: dri-devel@lists.freedesktop.org, Andrzej Hajda , Conor Dooley , David Airlie , Jernej Skrabec , Jonas Karlman , Krzysztof Kozlowski , Laurent Pinchart , Maarten Lankhorst , Neil Armstrong , Rob Herring , Robert Foss , Simona Vetter , Thomas Zimmermann , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250901142958.843678-1-mike.looijmans@topic.nl> <1b153bce-a66a-45ee-a5c6-963ea6fb1c82.949ef384-8293-46b8-903f-40a477c056ae.edc18686-244f-441e-a6ac-0b62492b96c8@emailsignatures365.codetwo.com> <20250901142958.843678-2-mike.looijmans@topic.nl> Content-Language: nl, en-US Organization: TOPIC In-Reply-To: Content-Type: text/plain; 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X-OriginatorOrg: topic.nl X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Sep 2025 11:12:37.4334 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4543362f-e459-4bf5-825f-08ddeadaca56 X-MS-Exchange-CrossTenant-Id: 449607a5-3517-482d-8d16-41dd868cbda3 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=449607a5-3517-482d-8d16-41dd868cbda3;Ip=[20.93.157.195];Helo=[westeu11-emailsignatures-cloud.codetwo.com] X-MS-Exchange-CrossTenant-AuthSource: AM2PEPF0001C715.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MRWPR04MB11517 On 03-09-2025 08:17, Mike Looijmans wrote: > On 02-09-2025 19:29, Maxime Ripard wrote: >> On Mon, Sep 01, 2025 at 04:29:01PM +0200, Mike Looijmans wrote: >>> +=C2=A0 ti,retimer-threshold-hz: >>> +=C2=A0=C2=A0=C2=A0 minimum: 25000000 >>> +=C2=A0=C2=A0=C2=A0 maximum: 600000000 >>> +=C2=A0=C2=A0=C2=A0 default: 200000000 >>> +=C2=A0=C2=A0=C2=A0 description: >>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Cross-over point. Up until this pixel c= lock frequency >>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 the chip remains in the low-power redri= ver mode. Above >>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 the threshold the chip should operate i= n retimer mode. >> Why should anyone want to tune this at the firmware level? > > It's a board property. You'd set this based on the hardware you've solder= ed=20 > on. If your clock and serdes are good quality, there's no need for the ch= ip=20 > to be in retimer mode (it will consume more power and actually make the=20 > signal worse). At higher speeds, that situation may change, hence the nee= d=20 > for a way to describe that. The chip has a similar function built in, but= =20 > with only 2 choices of cross-over point. > > To tune these parameters (retimer, equalizer), you'll probably have to ta= ke=20 > your equipment to a test facility (like we did). It's not something that= =20 > end-users would want to tune themselves. > > Most of these settings can also be done using pin strapping. I guess it'd= be=20 > helpful if I added that to the description. Looking back at the datasheet - once you enable the I2C interface of the pi= n,=20 many of the pinstrapping options are no longer available (such as slew-rate= ,=20 dvi/hdmi mode, equalizer and termination). The devicetree properties allow= =20 these settings to be applied again. > ... > M.