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Tue, 30 Dec 2025 17:36:40 +0000 Received: from PH8PR11MB8287.namprd11.prod.outlook.com ([fe80::7e8b:2e5:8ce4:2350]) by PH8PR11MB8287.namprd11.prod.outlook.com ([fe80::7e8b:2e5:8ce4:2350%3]) with mapi id 15.20.9456.013; Tue, 30 Dec 2025 17:36:40 +0000 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable In-Reply-To: <20251230083142.70064-4-suraj.kandpal@intel.com> References: <20251230083142.70064-1-suraj.kandpal@intel.com> <20251230083142.70064-4-suraj.kandpal@intel.com> Subject: Re: [PATCH 3/3] drm/i915/cx0: Clear response ready & error bit From: Gustavo Sousa CC: , , Suraj Kandpal To: Suraj Kandpal , , Date: Tue, 30 Dec 2025 14:36:35 -0300 Message-ID: <176711619593.18661.17406989812251209808@intel.com> User-Agent: alot/0.12.dev22+g972188619 X-ClientProxiedBy: SJ0P220CA0030.NAMP220.PROD.OUTLOOK.COM (2603:10b6:a03:41b::6) To PH8PR11MB8287.namprd11.prod.outlook.com (2603:10b6:510:1c7::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8287:EE_|IA3PR11MB9206:EE_ X-MS-Office365-Filtering-Correlation-Id: 5ca871a9-10fb-4623-06e6-08de47c9fd7f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; 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If not done >we find that the PHY hangs since it ends up in a weird state if left >idle for more than 1 hour. Since the series title refers to suspend/resume, is there an easy way of reproducing this via some power state transition? I'm wondering if we are looking at a driver issue here or if this is really something else. I see that we usually call intel_cx0_bus_reset() in error paths, which contains a call to intel_clear_response_ready_flag(), but it could end up being not called if the reset times out. Do we see error messages from the driver when the PHY hangs? -- Gustavo Sousa > >Bspec: 65101 >Signed-off-by: Suraj Kandpal >--- > drivers/gpu/drm/i915/display/intel_cx0_phy.c | 4 ++++ > 1 file changed, 4 insertions(+) > >diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/dr= m/i915/display/intel_cx0_phy.c >index 5edd293b533b..5ebc3404eee2 100644 >--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c >+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c >@@ -222,6 +222,8 @@ static int __intel_cx0_read_once(struct intel_encoder = *encoder, > return -ETIMEDOUT; > } >=20 >+ intel_clear_response_ready_flag(encoder, lane); >+ > intel_de_write(display, XELPDP_PORT_M2P_MSGBUS_CTL(display, port,= lane), > XELPDP_PORT_M2P_TRANSACTION_PENDING | > XELPDP_PORT_M2P_COMMAND_READ | >@@ -293,6 +295,8 @@ static int __intel_cx0_write_once(struct intel_encoder= *encoder, > return -ETIMEDOUT; > } >=20 >+ intel_clear_response_ready_flag(encoder, lane); >+ > intel_de_write(display, XELPDP_PORT_M2P_MSGBUS_CTL(display, port,= lane), > XELPDP_PORT_M2P_TRANSACTION_PENDING | > (committed ? XELPDP_PORT_M2P_COMMAND_WRITE_COMMITT= ED : >--=20 >2.34.1 >