linux-kernel - Re: [PATCH 3/3] drm/amd/display: Support DRM_AMD_DC

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Message-ID: <20231130-pellet-parted-4c3854bda573@spud>
Date:   Thu, 30 Nov 2023 08:27:01 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Conor Dooley <conor.dooley@...rochip.com>,
        Samuel Holland <samuel.holland@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, David Airlie <airlied@...il.com>,
        Christian König <christian.koenig@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Pan Xinhui <Xinhui.Pan@....com>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        llvm@...ts.linux.dev, arnd@...db.de
Subject: Re: [PATCH 3/3] drm/amd/display: Support DRM_AMD_DC_FP on RISC-V

On Wed, Nov 29, 2023 at 05:42:24PM -0700, Nathan Chancellor wrote:
> On Thu, Nov 23, 2023 at 02:23:01PM +0000, Conor Dooley wrote:
> > On Tue, Nov 21, 2023 at 07:05:15PM -0800, Samuel Holland wrote:
> > > RISC-V uses kernel_fpu_begin()/kernel_fpu_end() like several other
> > > architectures. Enabling hardware FP requires overriding the ISA string
> > > for the relevant compilation units.
> > 
> > Ah yes, bringing the joy of frame-larger-than warnings to RISC-V:
> > ../drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn32/display_mode_vba_32.c:58:13: warning: stack frame size (2416) exceeds limit (2048) in 'DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation' [-Wframe-larger-than]
> 
> :(
> 
> > Nathan, have you given up on these being sorted out?
> 
> Does your configuration have KASAN (I don't think RISC-V supports
> KCSAN)? It is possible that dml/dcn32 needs something similar to commit
> 6740ec97bcdb ("drm/amd/display: Increase frame warning limit with KASAN
> or KCSAN in dml2")?

It's from allmodconfig, so yes, I think so.


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