linux-kernel - Re: [PATCH v4 8/8] drm/imagination: Enable PowerVR driver for RISC-V

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Message-ID: <9765c970-55cc-4413-9fd0-5e0cdfa900fa@samsung.com>
Date: Mon, 16 Jun 2025 11:09:42 +0200
From: Michal Wilczynski <m.wilczynski@...sung.com>
To: kernel test robot <lkp@...el.com>, Drew Fustini <drew@...7.com>, Guo Ren
	<guoren@...nel.org>, Fu Wei <wefu@...hat.com>, Rob Herring
	<robh@...nel.org>, Krzysztof Kozlowski <krzk@...nel.org>, Conor Dooley
	<conor+dt@...nel.org>, Bartosz Golaszewski <brgl@...ev.pl>, Philipp Zabel
	<p.zabel@...gutronix.de>, Frank Binns <frank.binns@...tec.com>, Matt Coster
	<matt.coster@...tec.com>, Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>, Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>, Ulf Hansson <ulf.hansson@...aro.org>, Marek
	Szyprowski <m.szyprowski@...sung.com>
Cc: Paul Gazzillo <paul@...zz.com>, Necip Fazil Yildiran
	<fazilyildiran@...il.com>, oe-kbuild-all@...ts.linux.dev,
	linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v4 8/8] drm/imagination: Enable PowerVR driver for
 RISC-V



On 6/15/25 12:51, kernel test robot wrote:
> Hi Michal,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on 4774cfe3543abb8ee98089f535e28ebfd45b975a]
> 
> url:    https://protect2.fireeye.com/v1/url?k=6c3bc994-0cd954c9-6c3a42db-000babd9f1ba-30c2378fa012fc4a&q=1&e=c39c960c-4d5f-44d7-aed7-0097394dfc81&u=https%3A%2F%2Fgithub.com%2Fintel-lab-lkp%2Flinux%2Fcommits%2FMichal-Wilczynski%2Fpower-sequencing-Add-T-HEAD-TH1520-GPU-power-sequencer-driver%2F20250615-021142
> base:   4774cfe3543abb8ee98089f535e28ebfd45b975a
> patch link:    https://lore.kernel.org/r/20250614-apr_14_for_sending-v4-8-8e3945c819cd%40samsung.com
> patch subject: [PATCH v4 8/8] drm/imagination: Enable PowerVR driver for RISC-V
> config: riscv-kismet-CONFIG_DRM_GEM_SHMEM_HELPER-CONFIG_DRM_POWERVR-0-0 (https://download.01.org/0day-ci/archive/20250615/202506151839.IKkZs0Z0-lkp@intel.com/config)
> reproduce: (https://download.01.org/0day-ci/archive/20250615/202506151839.IKkZs0Z0-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202506151839.IKkZs0Z0-lkp@intel.com/
> 
> kismet warnings: (new ones prefixed by >>)
>>> kismet: WARNING: unmet direct dependencies detected for DRM_GEM_SHMEM_HELPER when selected by DRM_POWERVR
>    WARNING: unmet direct dependencies detected for DRM_GEM_SHMEM_HELPER
>      Depends on [n]: HAS_IOMEM [=y] && DRM [=y] && MMU [=n]

I believe this is triggered because RISC-V can be compiled without MMU
support, while MMU support is mandatory for ARM64.

Would an acceptable fix be to require an explicit dependency on the MMU,
like so?

depends on (ARM64 || RISCV) && MMU

>      Selected by [y]:
>      - DRM_POWERVR [=y] && HAS_IOMEM [=y] && (ARM64 || RISCV [=y]) && DRM [=y] && PM [=y]
> 

Best regards,
-- 
Michal Wilczynski <m.wilczynski@...sung.com>