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Tue, 21 Oct 2025 16:21:34 +0000 Message-ID: Date: Tue, 21 Oct 2025 11:21:31 -0500 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] drm/amd/display: Don't program BLNDGAM_MEM_PWR_FORCE when CM low-power is disabled on DCN30 To: Matthew Schwartz , amd-gfx@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org, alexander.deucher@amd.com, alex.hung@amd.com, daniel.wheeler@amd.com, roman.li@amd.com, misyl@froggi.es References: <20251020230934.387745-1-matthew.schwartz@linux.dev> Content-Language: en-US From: Mario Limonciello In-Reply-To: <20251020230934.387745-1-matthew.schwartz@linux.dev> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DM6PR18CA0012.namprd18.prod.outlook.com (2603:10b6:5:15b::25) To MN0PR12MB6101.namprd12.prod.outlook.com (2603:10b6:208:3cb::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN0PR12MB6101:EE_|DM6PR12MB4251:EE_ X-MS-Office365-Filtering-Correlation-Id: e046feba-4d28-4dc4-4bb2-08de10bde6ba X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|7053199007; 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The BLNDGAM power > helper writes BLNDGAM_MEM_PWR_FORCE when CM low-power is disabled, causing > immediate SRAM power toggles instead of deferring at vupdate. This can > disrupt atomic color/LUT sequencing during transitions between > direct scanout and composition within gamescope's DRM backend on > Steam Deck OLED. > > To fix this, leave the BLNDGAM power state unchanged when low-power is > disabled, matching dpp3_power_on_hdr3dlut and dpp3_power_on_shaper. > > Fixes: 33056a97ae5e ("drm/amd/display: Remove double checks for `debug.enable_mem_low_power.bits.cm`") > Signed-off-by: Matthew Schwartz Reviewed-by: Mario Limonciello > --- > drivers/gpu/drm/amd/display/dc/dpp/dcn30/dcn30_dpp.c | 3 --- > 1 file changed, 3 deletions(-) > > diff --git a/drivers/gpu/drm/amd/display/dc/dpp/dcn30/dcn30_dpp.c b/drivers/gpu/drm/amd/display/dc/dpp/dcn30/dcn30_dpp.c > index 09be2a90cc79d..4f569cd8a5d61 100644 > --- a/drivers/gpu/drm/amd/display/dc/dpp/dcn30/dcn30_dpp.c > +++ b/drivers/gpu/drm/amd/display/dc/dpp/dcn30/dcn30_dpp.c > @@ -578,9 +578,6 @@ static void dpp3_power_on_blnd_lut( > dpp_base->ctx->dc->optimized_required = true; > dpp_base->deferred_reg_writes.bits.disable_blnd_lut = true; > } > - } else { > - REG_SET(CM_MEM_PWR_CTRL, 0, > - BLNDGAM_MEM_PWR_FORCE, power_on == true ? 0 : 1); > } > } >