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Thu, 15 Jul 2021 19:40:31 +0000 Subject: Re: [PATCH] drm/amd/display: Fix 10bit 4K display on CIK GPUs To: Mario Kleiner , Alex Deucher Cc: Liviu Dudau , Leo Li , "Pan, Xinhui" , LKML , amd-gfx list , Maling list - DRI developers , Alex Deucher , =?UTF-8?Q?Christian_K=c3=b6nig?= References: <20210714080652.113381-1-liviu@dudau.co.uk> From: Harry Wentland Message-ID: Date: Thu, 15 Jul 2021 15:40:27 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: YQXPR0101CA0033.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c00:15::46) To CO6PR12MB5427.namprd12.prod.outlook.com (2603:10b6:5:358::13) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.50.3] (198.200.67.154) by YQXPR0101CA0033.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c00:15::46) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4331.21 via Frontend Transport; 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On my machine with a HAWAII GPU I get a broken >>> image that looks like it has an effective resolution of 1920x1080 but >>> scaled up in an irregular way. Reverting the commit or applying this >>> patch fixes the problem on v5.14-rc1. >>> >>> Fixes: 72a7cf0aec0c ("drm/amd/display: Keep linebuffer pixel depth at 30bpp for DCE-11.0.") >>> Signed-off-by: Liviu Dudau >> >> Harry or Mario any ideas? Maybe we need finer grained DCE version >> checking? I don't remember all of the caveats of this stuff. DCE11 >> and older is getting to be pretty old at this point. I can just apply >> this if you don't have any insights. >> >> Alex >> > > Hi Alex > > I'd be fine with applying this. As my original commit says, photometer > measurements showed that increasing the line buffer depth was only > needed for my DCN-1 RavenRidge, not for my DCE-11.2 Polaris11 or a > DCE-8.3 cik, so this should probably not cause harm to the increased > precision modes. > > Note that given the hardware and USB-C/DP-HDMI adapters i have, I only > tested this on a 2560x1440@144 Hz DP monitor with DCN-1, DCE-11.2, and > a 2560x1440@100 Hz HDMI monitor iirc with DCN-1, DCE-8.3, and i think > on a 2880x1800@60 Hz MBP Retina eDP panel with DCE-11.2. These are the > highest resolution/framerate monitors I have atm.I don't have access > to any 4k monitors, so maybe the problem is somehow specific to such > high resolutions? Maybe somewhere else in the code something would > need to be adapted? Lacking actual hw docs, my coding here is by > pattern matching against existing DC code, guessing and testing on my > limited hw samples. > > Acked-by: Mario Kleiner Makes sense. Reviewed-by: Harry Wentland Harry > > -mario > >>> --- >>> drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 2 +- >>> 1 file changed, 1 insertion(+), 1 deletion(-) >>> >>> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c >>> index a6a67244a322e..1596f6b7fed7c 100644 >>> --- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c >>> +++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c >>> @@ -1062,7 +1062,7 @@ bool resource_build_scaling_params(struct pipe_ctx *pipe_ctx) >>> * so use only 30 bpp on DCE_VERSION_11_0. Testing with DCE 11.2 and 8.3 >>> * did not show such problems, so this seems to be the exception. >>> */ >>> - if (plane_state->ctx->dce_version != DCE_VERSION_11_0) >>> + if (plane_state->ctx->dce_version > DCE_VERSION_11_0) >>> pipe_ctx->plane_res.scl_data.lb_params.depth = LB_PIXEL_DEPTH_36BPP; >>> else >>> pipe_ctx->plane_res.scl_data.lb_params.depth = LB_PIXEL_DEPTH_30BPP; >>> -- >>> 2.32.0 >>> >>> _______________________________________________ >>> amd-gfx mailing list >>> amd-gfx@lists.freedesktop.org >>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx>