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Wed, 21 Jan 2026 06:23:54 +0000 Message-ID: <98a49d10-72ef-4dcc-a836-d7b5d21a6ca3@intel.com> Date: Wed, 21 Jan 2026 11:53:45 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] drm/display: Bump LSPCON mode switch timeout to 1000ms To: TrainedPro , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann CC: David Airlie , Daniel Vetter , , References: <20260111180320.4047086-1-hassaananwar12345@gmail.com> Content-Language: en-US From: "Nautiyal, Ankit K" In-Reply-To: <20260111180320.4047086-1-hassaananwar12345@gmail.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MA1P287CA0002.INDP287.PROD.OUTLOOK.COM (2603:1096:a00:35::22) To DM4PR11MB5341.namprd11.prod.outlook.com (2603:10b6:5:390::22) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR11MB5341:EE_|PH7PR11MB7076:EE_ X-MS-Office365-Filtering-Correlation-Id: f62344e6-d6b3-48e7-d451-08de58b5a684 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7053199007; 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This specific implementation forces a 200ms limit, effectively overriding the driver's knowledge and causing the mode change to time out prematurely, which results in a black screen (never waking up). > > This patch increases the hardcoded timeout in the helper from 200ms to 1000ms. Since the function polls for the status bit, this change does not penalize faster chips but ensures correct operation for slower ones like the PS175. > > Signed-off-by: TrainedPro > --- > drivers/gpu/drm/display/drm_dp_dual_mode_helper.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/display/drm_dp_dual_mode_helper.c b/drivers/gpu/drm/display/drm_dp_dual_mode_helper.c > index 719da3610310f..fda3cb4966adf 100644 > --- a/drivers/gpu/drm/display/drm_dp_dual_mode_helper.c > +++ b/drivers/gpu/drm/display/drm_dp_dual_mode_helper.c > @@ -495,7 +495,7 @@ int drm_lspcon_set_mode(const struct drm_device *dev, struct i2c_adapter *adapte > { > u8 data = 0; > int ret; > - int time_out = 200; > + int time_out = 1000; The change to increase the timeout was already made more than a year ago [1]. Could you please try with the latest drm-tip and see if the issue still persists? [1] https://gitlab.freedesktop.org/drm/tip/-/commit/2e0727c347467775a2dfa7d850a3a029f3212e58 Regards, Ankit > enum drm_lspcon_mode current_mode; > > if (mode == DRM_LSPCON_MODE_PCON)