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Wed, 3 Sep 2025 06:17:34 +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 06:17:34 +0000 Message-ID: Date: Wed, 3 Sep 2025 08:17:33 +0200 User-Agent: Mozilla Thunderbird From: Mike Looijmans Subject: Re: [PATCH v4 1/2] dt-bindings: drm/bridge: ti-tmds181: Add TI TMDS181 and SN65DP159 bindings 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 06:17:37.9925 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cb5a2fac-70ea-4883-443f-08ddeab194ca 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: DB1PEPF000509FB.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS1PR04MB9560 On 02-09-2025 19:29, Maxime Ripard wrote: > On Mon, Sep 01, 2025 at 04:29:01PM +0200, Mike Looijmans wrote: >> + ti,retimer-threshold-hz: >> + minimum: 25000000 >> + maximum: 600000000 >> + default: 200000000 >> + description: >> + Cross-over point. Up until this pixel clock frequency >> + the chip remains in the low-power redriver mode. Above >> + the threshold the chip should operate in 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 soldered= =20 on. If your clock and serdes are good quality, there's no need for the chip= to=20 be in retimer mode (it will consume more power and actually make the signal= =20 worse). At higher speeds, that situation may change, hence the need for a w= ay=20 to describe that. The chip has a similar function built in, but with only 2= =20 choices of cross-over point. To tune these parameters (retimer, equalizer), you'll probably have to take= =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 b= e=20 helpful if I added that to the description. >> + ti,dvi-mode: >> + type: boolean >> + description: Makes the DP159 chip operate in DVI mode. > Ditto. Both describe policy, not hardware. I would set this flag if I've soldered on a DVI connector instead of a HDMI= =20 one. I'd consider that hardware. >> + ti,slew-rate: >> + $ref: /schemas/types.yaml#/definitions/uint32 >> + minimum: 0 >> + maximum: 3 >> + default: 3 >> + description: Set slew rate, 0 is slowest, 3 is fastest. >> + >> + ti,disable-equalizer: >> + type: boolean >> + description: Disable the equalizer (to save power). > Why shouldn't we disable all the time then? Again, it looks like a > policy, and not something that should be set in stone in the firmware. Again, board property. The equalizer is there to make up for things like PC= B=20 losses (mismatch maybe?) or serdes running at (or beyond) its maximum. Agai= n,=20 depending on your board you may need this or not. It replaces a pinstrappin= g=20 option. >> + ti,adaptive-equalizer: >> + type: boolean >> + description: Set the equalizer to adaptive mode. It's the default setting of the chip so this flag will be removed in the ne= xt=20 version. > Maxime Mike.