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Wed, 15 Jul 2026 21:00:12 +0200 (CEST) Date: Wed, 15 Jul 2026 21:00:12 +0200 From: Sebastian Reichel To: Andy Yan 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 , Luca Ceresoli , 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, yubing.zhang@rock-chips.com Subject: Re: [PATCH v3 08/10] drm/rockchip: dw_dp: Add runtime PM support Message-ID: References: <20260612-synopsys-dw-dp-improvements-v3-0-dc61e6352508@collabora.com> <20260612-synopsys-dw-dp-improvements-v3-8-dc61e6352508@collabora.com> Precedence: bulk X-Mailing-List: linux-kernel@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="m5xipsbap4cvs25e" Content-Disposition: inline In-Reply-To: X-Zoho-Virus-Status: 1 X-Zoho-AV-Stamp: zmail-av-0.2.10.1.5.2/284.121.97 X-ZohoMailClient: External --m5xipsbap4cvs25e Content-Type: text/plain; protected-headers=v1; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH v3 08/10] drm/rockchip: dw_dp: Add runtime PM support MIME-Version: 1.0 Hello Andy, On Tue, Jul 14, 2026 at 06:08:06PM +0800, Andy Yan wrote: > > @@ -58,6 +59,8 @@ static void dw_dp_rockchip_hpd_sw_sel(void *data, bool > > force_hpd_from_sw) > > > > dp->hpd_sel =3D force_hpd_from_sw; > > > > + ACQUIRE(pm_runtime_active_auto, pm)(dp->dev); >=20 > This can triger HPD irq for USB-C DP AltMode, but for a standard > DP port, this is no way to acquire runtime, so there will no irq > when plug in. Right. I don't have any RK3588 or RK3576 system exposing a DP connector directly. This this is non-trivial to test for me :/ I see the following options: 1. Only enable runtime PM when running in USB-C mode 2. Mux the HPD pin as GPIO to support waking up with the controller being suspended; either remux when the controller is awake or use the same mechanism as USB-C to do software based HPD on top of the GPIO (which would allow using any GPIO as HPD). 3. Have a poll function, which wakes up the controller regularly to check the status I consider going for option 1 for now, which allows option 2 to be implemented as a follow up. Mostly to avoid that the series becomes as big and messy as the USBDP PHY series became. 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