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X-OriginatorOrg: topic.nl X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Sep 2025 05:54:35.5428 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9f0bce73-acc2-4e12-499d-08ddeb77870d 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: AMS1EPF0000004A.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DBBPR04MB8010 On 03-09-2025 17:25, Dmitry Baryshkov wrote: > On Wed, Sep 03, 2025 at 08:17:33AM +0200, 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: >>>> + 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 solde= red >> on. If your clock and serdes are good quality, there's no need for the c= hip >> to be in retimer mode (it will consume more power and actually make the >> signal worse). At higher speeds, that situation may change, hence the ne= ed >> for a way to describe that. The chip has a similar function built in, bu= t >> with only 2 choices of cross-over point. >> >> To tune these parameters (retimer, equalizer), you'll probably have to t= ake >> your equipment to a test facility (like we did). It's not something that >> end-users would want to tune themselves. >> >> Most of these settings can also be done using pin strapping. I guess it'= d be >> 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 H= DMI >> one. I'd consider that hardware. > Do you need to set this if you have DVI monitor attached to the HDMI > connector via the passive cable? In our testing, the setting didn't appear to have any effect on the video=20 signals. Activating the I2C interface blocks the pinstrapping setting of th= is=20 bit, that's the only reason it's there. I've been digging through the datasheet. It appears that the DVI mode disab= les=20 an I2C slave on the DDC bus, when in HDMI_SEL mode the datasheet says:=C2= =A0=20 "Device configured for HDMI (Adaptor ID block is readable through I2C or=20 I2C-over-AUX." Apparently a better name for the pin would be "disable-adaptor-id-block". Another approach would be to just always disable it in the driver. It appea= rs=20 to make the retimer "visible" in the DDC path and even allows to change som= e=20 settings that way (most noticeably, turn it on/off), which will interfere w= ith=20 the driver's functions. If we're directly controlling the device over I2C, = one=20 shouldn't be using this secondary interface. > As for the connector type, you can check it in the .atomic_enable by > checking drm_connector::connector_type. Assuming this is the last bridge, yes. But see above, I suggest removing th= is=20 from the bindings and just always set it in the driver. M.