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Tue, 5 Aug 2025 07:37:08 +0000 From: Imre Deak To: , CC: , Charlton Lin , "Khaled Almahallawy" Subject: [PATCH 01/19] drm/i915/lnl+/tc: Fix handling of an enabled/disconnected dp-alt sink Date: Tue, 5 Aug 2025 10:36:42 +0300 Message-ID: <20250805073700.642107-2-imre.deak@intel.com> X-Mailer: git-send-email 2.49.1 In-Reply-To: <20250805073700.642107-1-imre.deak@intel.com> References: <20250805073700.642107-1-imre.deak@intel.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: DUZP191CA0024.EURP191.PROD.OUTLOOK.COM (2603:10a6:10:4f9::21) To SJ0PR11MB4845.namprd11.prod.outlook.com (2603:10b6:a03:2d1::10) Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ0PR11MB4845:EE_|DS0PR11MB8161:EE_ X-MS-Office365-Filtering-Correlation-Id: 2c6a437c-7f94-4c34-01ef-08ddd3f2e1ad X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|10070799003|366016|1800799024|376014; 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For the PHY to be in DP-alt or legacy mode and for the PHY to be in the connected state in these modes, both the Owned (set by the BIOS/driver) and the Ready (set by the HW) flags should be set. On ICL-MTL the HW kept the PHY's Ready flag set after the driver connected the PHY by acquiring the PHY ownership (by setting the Owned flag), until the driver disconnected the PHY by releasing the PHY ownership (by clearing the Owned flag). On LNL+ this has changed, in that the HW clears the Ready flag as soon as the sink gets disconnected, even if the PHY ownership was acquired already and hence the PHY is being used by the display. When inheriting the HW state from BIOS for a PHY connected in DP-alt mode on which the sink got disconnected - i.e. in a case where the sink was connected while BIOS/GOP was running and so the sink got enabled connecting the PHY, but the user disconnected the sink by the time the driver loaded - the PHY Owned but not Ready state must be accounted for on LNL+ according to the above. Do that by assuming on LNL+ that the PHY is connected in DP-alt mode whenever the PHY Owned flag is set, regardless of the PHY Ready flag. This fixes a problem on LNL+, where the PHY TypeC mode / connected state was detected incorrectly for a DP-alt sink, which got connected and then disconnected by the user in the above way. Cc: stable@vger.kernel.org # v6.8+ Reported-by: Charlton Lin Tested-by: Khaled Almahallawy Signed-off-by: Imre Deak --- drivers/gpu/drm/i915/display/intel_tc.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c index 3bc57579fe53e..73a08bd84a70a 100644 --- a/drivers/gpu/drm/i915/display/intel_tc.c +++ b/drivers/gpu/drm/i915/display/intel_tc.c @@ -1226,14 +1226,18 @@ static void tc_phy_get_hw_state(struct intel_tc_port *tc) tc->phy_ops->get_hw_state(tc); } -static bool tc_phy_is_ready_and_owned(struct intel_tc_port *tc, - bool phy_is_ready, bool phy_is_owned) +static bool tc_phy_in_legacy_or_dp_alt_mode(struct intel_tc_port *tc, + bool phy_is_ready, bool phy_is_owned) { struct intel_display *display = to_intel_display(tc->dig_port); - drm_WARN_ON(display->drm, phy_is_owned && !phy_is_ready); + if (DISPLAY_VER(display) < 20) { + drm_WARN_ON(display->drm, phy_is_owned && !phy_is_ready); - return phy_is_ready && phy_is_owned; + return phy_is_ready && phy_is_owned; + } else { + return phy_is_owned; + } } static bool tc_phy_is_connected(struct intel_tc_port *tc, @@ -1244,7 +1248,7 @@ static bool tc_phy_is_connected(struct intel_tc_port *tc, bool phy_is_owned = tc_phy_is_owned(tc); bool is_connected; - if (tc_phy_is_ready_and_owned(tc, phy_is_ready, phy_is_owned)) + if (tc_phy_in_legacy_or_dp_alt_mode(tc, phy_is_ready, phy_is_owned)) is_connected = port_pll_type == ICL_PORT_DPLL_MG_PHY; else is_connected = port_pll_type == ICL_PORT_DPLL_DEFAULT; @@ -1352,7 +1356,7 @@ tc_phy_get_current_mode(struct intel_tc_port *tc) phy_is_ready = tc_phy_is_ready(tc); phy_is_owned = tc_phy_is_owned(tc); - if (!tc_phy_is_ready_and_owned(tc, phy_is_ready, phy_is_owned)) { + if (!tc_phy_in_legacy_or_dp_alt_mode(tc, phy_is_ready, phy_is_owned)) { mode = get_tc_mode_in_phy_not_owned_state(tc, live_mode); } else { drm_WARN_ON(display->drm, live_mode == TC_PORT_TBT_ALT); -- 2.49.1