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mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Received: from PH8PR11MB8287.namprd11.prod.outlook.com (2603:10b6:510:1c7::14) by CY8PR11MB7924.namprd11.prod.outlook.com (2603:10b6:930:7a::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8943.30; Tue, 22 Jul 2025 11:57:34 +0000 Received: from PH8PR11MB8287.namprd11.prod.outlook.com ([fe80::7e8b:2e5:8ce4:2350]) by PH8PR11MB8287.namprd11.prod.outlook.com ([fe80::7e8b:2e5:8ce4:2350%6]) with mapi id 15.20.8943.028; Tue, 22 Jul 2025 11:57:33 +0000 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable In-Reply-To: <20250722101317.1728499-2-jouni.hogander@intel.com> References: <20250722101317.1728499-1-jouni.hogander@intel.com> <20250722101317.1728499-2-jouni.hogander@intel.com> Subject: Re: [PATCH v2 1/4] drm/i915/display: Write PHY_CMN1_CONTROL only when using AUXLess ALPM From: Gustavo Sousa CC: Jouni =?utf-8?q?H=C3=B6gander?= To: Jouni =?utf-8?q?H=C3=B6gander?= , , Date: Tue, 22 Jul 2025 08:57:27 -0300 Message-ID: <175318544750.16862.14298552021054861249@intel.com> User-Agent: alot/0.12.dev27+gd21c920b07eb X-ClientProxiedBy: MW4PR04CA0187.namprd04.prod.outlook.com (2603:10b6:303:86::12) To PH8PR11MB8287.namprd11.prod.outlook.com (2603:10b6:510:1c7::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8287:EE_|CY8PR11MB7924:EE_ X-MS-Office365-Filtering-Correlation-Id: d37dfc42-fa24-442f-da2e-08ddc916f1aa X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|366016; 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According to Bspec Configuring >LFPS sending is needed only when using AUXLess ALPM. This patch avoids >these failures by configuring LFPS sending only when using AUXLess ALPM. > >Fixes: 9dc619680de4 ("drm/i915/display: Add function to configure LFPS sen= ding") >Signed-off-by: Jouni H=C3=B6gander I'm really curious if the programming works on the AUXLess ALPM case... That said, this matches the spec, so Reviewed-by: Gustavo Sousa Could you also put the reference to the respective Bspec page in the trailers? That could be done while pushing, I think. -- Gustavo Sousa >--- > drivers/gpu/drm/i915/display/intel_cx0_phy.c | 8 +++----- > 1 file changed, 3 insertions(+), 5 deletions(-) > >diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/dr= m/i915/display/intel_cx0_phy.c >index ed8e640b96b0..2b0305bb04cd 100644 >--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c >+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c >@@ -3240,11 +3240,10 @@ void intel_lnl_mac_transmit_lfps(struct intel_enco= der *encoder, > { > struct intel_display *display =3D to_intel_display(encoder); > u8 owned_lane_mask =3D intel_cx0_get_owned_lane_mask(encoder); >- bool enable =3D intel_alpm_is_alpm_aux_less(enc_to_intel_dp(encod= er), >- crtc_state); > int i; >=20 >- if (DISPLAY_VER(display) < 20) >+ if (DISPLAY_VER(display) < 20 || >+ !intel_alpm_is_alpm_aux_less(enc_to_intel_dp(encoder), crtc_s= tate)) > return; >=20 > for (i =3D 0; i < 4; i++) { >@@ -3256,8 +3255,7 @@ void intel_lnl_mac_transmit_lfps(struct intel_encode= r *encoder, >=20 > intel_cx0_rmw(encoder, lane_mask, PHY_CMN1_CONTROL(tx, 0)= , > CONTROL0_MAC_TRANSMIT_LFPS, >- enable ? CONTROL0_MAC_TRANSMIT_LFPS : 0, >- MB_WRITE_COMMITTED); >+ CONTROL0_MAC_TRANSMIT_LFPS, MB_WRITE_COMMIT= TED); > } > } >=20 >--=20 >2.43.0 >