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Fri, 05 Jun 2026 18:42:06 +0200 (CEST) Date: Fri, 5 Jun 2026 18:42:06 +0200 From: Sebastian Reichel To: Luca Ceresoli Cc: Sandy Huang , Heiko =?utf-8?Q?St=C3=BCbner?= , Andy Yan , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Rob Herring , Krzysztof Kozlowski , Conor Dooley , David Airlie , Simona Vetter , Dmitry Baryshkov , Cristian Ciocaltea , Damon Ding , Dmitry Baryshkov , Alexey Charkov , dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, kernel@collabora.com, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 05/12] drm/bridge: synopsys: dw-dp: Add follow-up bridge support Message-ID: References: <20260501-synopsys-dw-dp-improvements-v2-0-d7e7f6bac77f@collabora.com> <20260501-synopsys-dw-dp-improvements-v2-5-d7e7f6bac77f@collabora.com> <177918892313.537125.10814687633426590148.b4-review@b4> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="m4w4l56frz4pgctv" Content-Disposition: inline In-Reply-To: <177918892313.537125.10814687633426590148.b4-review@b4> X-Zoho-Virus-Status: 1 X-Zoho-AV-Stamp: zmail-av-0.2.2.1.5.2/280.674.88 X-ZohoMailClient: External --m4w4l56frz4pgctv Content-Type: text/plain; protected-headers=v1; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH v2 05/12] drm/bridge: synopsys: dw-dp: Add follow-up bridge support MIME-Version: 1.0 Hello Luca, On Tue, May 19, 2026 at 01:08:43PM +0200, Luca Ceresoli wrote: > On Fri, 01 May 2026 00:20:32 +0200, Sebastian Reichel wrote: > > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/= bridge/synopsys/dw-dp.c > > index fc4ddb7792d7..ccc55e40e81c 100644 > > --- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c > > +++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c > > @@ -2064,6 +2064,20 @@ struct dw_dp *dw_dp_bind(struct device *dev, str= uct drm_encoder *encoder, > > goto unregister_aux; > > } > > =20 > > + next_bridge =3D devm_drm_of_get_bridge(dev, dev->of_node, 1, 0); >=20 > devm_drm_of_get_bridge() looks for either a panel or a bridge. Is it > possible to have a panel connected here? >=20 > If it isn't, then using of_drm_get_bridge_by_endpoint() which has just be= en > merged [0] would be much simpler and cleaner. Technically this should always be connected to the USBDP PHY on the Rockchip platforms using this IP (RK3588 & RK3576) and there are no other upstream platforms using this code so far. Having said that, we do have some upstream DTs, which directly connect it to a DP connector instead (as the PHY does not yet expose a DRM bridge, that's being handled in a different series). But there is no upstream board connecting it to an eDP panel, so I will switch over to of_drm_get_bridge_by_endpoint(). Thanks for the info. Greetings, -- Sebastian >=20 > [0] https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/03d1078112fdd= d706b2c1e4a7d98cf18700eb5df >=20 > Luca >=20 > --=20 > Luca Ceresoli, Bootlin > Embedded Linux and Kernel engineering > https://bootlin.com >=20 --m4w4l56frz4pgctv Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEE72YNB0Y/i3JqeVQT2O7X88g7+poFAmoi/FMACgkQ2O7X88g7 +pphnA//Ybl+zfoxQYVFEOrEKJfflb05xZ7uBHTS161zwMfNHamKHq0m5XtJ0Cfy 5HrJ/AQ8R5Eizb3kI09PWMimzpjr/9pDFo7d1xb25zzP42pPFsCniXq1W4p/+D39 tsiUc7RruHWxniCf4xsZHSyYQd1L05KUwPbldLV1n7P+GEp5qGdmpsCPtlCxNJxr SJv1dGUo6Oq/enMdVd7Qs7gfE6ZQWXQ3+EHACruc7OldzfQoxi9L6+LFigsk8eAJ 9zxlu/MVy7rDhRNLzZ0JApYpXpbPz/G5mbCQFEbAhRrf1YRhiSwE3XtVyvicBUXL 8YeA+0/2e2W4WygQnC8B7bbOwnwaCYaek2hr5ftlVSjax8pLSJyH9LxGAgxY0tLF hxTl88B9PjKJUF8zTJLasGn/amgbB2amzfQKFxn8HYxQHy3k4MuP4uyhPE4PoVWH 5CH5HQF/sHk9eEwoMowUI9Lvn8hM6iRkh2djcm4LzdAlfeVMRiV45V0nYlhvMIHZ d6h182Vgk6yxsIhTv0bNHjkU4VTi9nslIyOhGi4hnin9BrdLdhfl+5RHQVNCb4pX Re7DOKH8LtCN9TJkwJL7pHsN6dCdnWyYkiJc8Am2nkiNZQDXrpoZGDzxDrwU8aJZ uyDrcem4Z+CEK8DSg6I24U5a5vJa/WPLK5VN7EF1QpXO/vij2S0= =dAt0 -----END PGP SIGNATURE----- --m4w4l56frz4pgctv--