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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 DM4PR11MB5341.namprd11.prod.outlook.com (2603:10b6:5:390::22) by DM6PR11MB4754.namprd11.prod.outlook.com (2603:10b6:5:2ad::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8398.21; Fri, 31 Jan 2025 16:13:23 +0000 Received: from DM4PR11MB5341.namprd11.prod.outlook.com ([fe80::397:7566:d626:e839]) by DM4PR11MB5341.namprd11.prod.outlook.com ([fe80::397:7566:d626:e839%7]) with mapi id 15.20.8398.017; Fri, 31 Jan 2025 16:13:22 +0000 Message-ID: <68b10ad5-0c67-4bd3-8455-3de81bb727fa@intel.com> Date: Fri, 31 Jan 2025 21:43:15 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 01/14] drm/i915/dp: Iterate DSC BPP from high to low on all platforms To: Jani Nikula , , CC: , References: <3bba67923cbcd13a59d26ef5fa4bb042b13c8a9b.1738327620.git.jani.nikula@intel.com> Content-Language: en-US From: "Nautiyal, Ankit K" In-Reply-To: <3bba67923cbcd13a59d26ef5fa4bb042b13c8a9b.1738327620.git.jani.nikula@intel.com> Content-Type: text/plain; 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However, it iterates from max to min bpp on display 13+, and from > min to max on other platforms. This presumably leads to minimum > compressed bpp always being chosen on display 11-12. > > Iterate from high to low on all platforms to actually use the best > possible compressed bpp. > > Fixes: 1c56e9a39833 ("drm/i915/dp: Get optimal link config to have best compressed bpp") > Cc: Ankit Nautiyal > Cc: Imre Deak > Cc: # v6.7+ > Signed-off-by: Jani Nikula Thanks for the fix. I think I intended to iterate from max to min in initial version of the patch (atleast the one sent to trybot [1]), but some how messed it up while rebasing. Reviewed-by: Ankit Nautiyal [1] https://lists.freedesktop.org/archives/intel-gfx-trybot/2022-June/129432.html > --- > drivers/gpu/drm/i915/display/intel_dp.c | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c > index d1b4fd542a1f..ecf192262eb9 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.c > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > @@ -2073,11 +2073,10 @@ icl_dsc_compute_link_config(struct intel_dp *intel_dp, > /* Compressed BPP should be less than the Input DSC bpp */ > dsc_max_bpp = min(dsc_max_bpp, output_bpp - 1); > > - for (i = 0; i < ARRAY_SIZE(valid_dsc_bpp); i++) { > - if (valid_dsc_bpp[i] < dsc_min_bpp) > + for (i = ARRAY_SIZE(valid_dsc_bpp) - 1; i >= 0; i--) { > + if (valid_dsc_bpp[i] < dsc_min_bpp || > + valid_dsc_bpp[i] > dsc_max_bpp) > continue; > - if (valid_dsc_bpp[i] > dsc_max_bpp) > - break; > > ret = dsc_compute_link_config(intel_dp, > pipe_config,