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Message-ID: <20250105231853.GA21164@pendragon.ideasonboard.com>
Date: Mon, 6 Jan 2025 01:18:53 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Jani Nikula <jani.nikula@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Karol Herbst <kherbst@...hat.com>, Lyude Paul <lyude@...hat.com>,
	Danilo Krummrich <dakr@...hat.com>,
	Harry Wentland <harry.wentland@....com>,
	Leo Li <sunpeng.li@....com>,
	Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	Xinhui Pan <Xinhui.Pan@....com>,
	Alain Volmat <alain.volmat@...s.st.com>,
	Raphael Gallais-Pou <rgallaispou@...il.com>,
	Liviu Dudau <liviu.dudau@....com>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>, Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Peter Senna Tschudin <peter.senna@...il.com>,
	Ian Ray <ian.ray@...com>,
	Martyn Welch <martyn.welch@...labora.co.uk>,
	Inki Dae <inki.dae@...sung.com>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Stefan Agner <stefan@...er.ch>, Alison Wang <alison.wang@....com>,
	Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Rob Clark <robdclark@...il.com>,
	Abhinav Kumar <quic_abhinavk@...cinc.com>,
	Sean Paul <sean@...rly.run>,
	Marijn Suijten <marijn.suijten@...ainline.org>,
	Dave Airlie <airlied@...hat.com>, Gerd Hoffmann <kraxel@...hat.com>,
	Sandy Huang <hjc@...k-chips.com>,
	Heiko Stübner <heiko@...ech.de>,
	Andy Yan <andy.yan@...k-chips.com>, Chen-Yu Tsai <wens@...e.org>,
	Samuel Holland <samuel@...lland.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Mikko Perttunen <mperttunen@...dia.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Dave Stevenson <dave.stevenson@...pberrypi.com>,
	Maíra Canal <mcanal@...lia.com>,
	Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>,
	Gurchetan Singh <gurchetansingh@...omium.org>,
	Chia-I Wu <olvaffe@...il.com>, Zack Rusin <zack.rusin@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	intel-gfx@...ts.freedesktop.org, intel-xe@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	nouveau@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
	virtualization@...ts.linux.dev, spice-devel@...ts.freedesktop.org,
	linux-rockchip@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
	linux-tegra@...r.kernel.org, Jani Nikula <jani.nikula@...el.com>
Subject: Re: [PATCH v2 0/5] drm/connector: make mode_valid() callback accept
 const mode pointer

On Mon, Jan 06, 2025 at 12:47:07AM +0200, Dmitry Baryshkov wrote:
> On Sat, Dec 14, 2024 at 03:37:04PM +0200, Dmitry Baryshkov wrote:
> > While working on the generic mode_valid() implementation for the HDMI
> > Connector framework I noticed that unlike other DRM objects
> > drm_connector accepts non-const pointer to struct drm_display_mode,
> > while obviously mode_valid() isn't expected to modify the argument.
> > 
> > Mass-change the DRM framework code to pass const argument to that
> > callback.
> > 
> > The series has been compile-tested with defconfig for x86-64, arm and
> > arm64.
> > 
> > Note: yes, I understand that this change might be hard to review and
> > merge. The only viable option that I foresee is to add new callback,
> > having the const argument and migrate drivers into using it one by one.
> 
> Colleagues, I'd like to graciously ping regarding this series. Should it
> be merged as is (possibly requiring more R-B's)? Or should I rework it
> adding something like .mode_valid_new() callback which takes const
> argument?

I personally like the end result. The diffstat isn't very big, I don't
think it's that hard to review.

> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > ---
> > Changes in v2:
> > - Rebased on top of linux-next
> > - Replaced 'accept const argument' with 'take a const arugment'
> >   (Laurent)
> > - Link to v1: https://lore.kernel.org/r/20241115-drm-connector-mode-valid-const-v1-0-b1b523156f71@linaro.org
> > 
> > ---
> > Dmitry Baryshkov (5):
> >       drm/encoder_slave: make mode_valid accept const struct drm_display_mode
> >       drm/amdgpu: don't change mode in amdgpu_dm_connector_mode_valid()
> >       drm/sti: hda: pass const struct drm_display_mode* to hda_get_mode_idx()
> >       drm/connector: make mode_valid_ctx take a const struct drm_display_mode
> >       drm/connector: make mode_valid take a const struct drm_display_mode
> > 
> >  drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c           |  8 ++++----
> >  drivers/gpu/drm/amd/amdgpu/atombios_dp.c                 |  2 +-
> >  drivers/gpu/drm/amd/amdgpu/atombios_dp.h                 |  2 +-
> >  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c        | 12 +++++++++---
> >  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h        |  2 +-
> >  drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c |  2 +-
> >  drivers/gpu/drm/arm/malidp_mw.c                          |  2 +-
> >  drivers/gpu/drm/bridge/adv7511/adv7511_drv.c             |  2 +-
> >  drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c      |  2 +-
> >  drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c |  7 -------
> >  drivers/gpu/drm/display/drm_bridge_connector.c           |  2 +-
> >  drivers/gpu/drm/display/drm_hdmi_state_helper.c          |  2 +-
> >  drivers/gpu/drm/drm_crtc_helper_internal.h               |  2 +-
> >  drivers/gpu/drm/drm_probe_helper.c                       |  2 +-
> >  drivers/gpu/drm/exynos/exynos_hdmi.c                     |  2 +-
> >  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c                |  2 +-
> >  drivers/gpu/drm/gma500/cdv_intel_crt.c                   |  2 +-
> >  drivers/gpu/drm/gma500/cdv_intel_dp.c                    |  2 +-
> >  drivers/gpu/drm/gma500/cdv_intel_hdmi.c                  |  2 +-
> >  drivers/gpu/drm/gma500/cdv_intel_lvds.c                  |  2 +-
> >  drivers/gpu/drm/gma500/oaktrail_hdmi.c                   |  2 +-
> >  drivers/gpu/drm/gma500/psb_intel_drv.h                   |  2 +-
> >  drivers/gpu/drm/gma500/psb_intel_lvds.c                  |  2 +-
> >  drivers/gpu/drm/gma500/psb_intel_sdvo.c                  |  2 +-
> >  drivers/gpu/drm/i2c/ch7006_drv.c                         |  2 +-
> >  drivers/gpu/drm/i2c/sil164_drv.c                         |  2 +-
> >  drivers/gpu/drm/i915/display/dvo_ch7017.c                |  2 +-
> >  drivers/gpu/drm/i915/display/dvo_ch7xxx.c                |  2 +-
> >  drivers/gpu/drm/i915/display/dvo_ivch.c                  |  2 +-
> >  drivers/gpu/drm/i915/display/dvo_ns2501.c                |  2 +-
> >  drivers/gpu/drm/i915/display/dvo_sil164.c                |  2 +-
> >  drivers/gpu/drm/i915/display/dvo_tfp410.c                |  2 +-
> >  drivers/gpu/drm/i915/display/icl_dsi.c                   |  2 +-
> >  drivers/gpu/drm/i915/display/intel_crt.c                 |  2 +-
> >  drivers/gpu/drm/i915/display/intel_dp.c                  |  2 +-
> >  drivers/gpu/drm/i915/display/intel_dp_mst.c              |  2 +-
> >  drivers/gpu/drm/i915/display/intel_dsi.c                 |  2 +-
> >  drivers/gpu/drm/i915/display/intel_dsi.h                 |  2 +-
> >  drivers/gpu/drm/i915/display/intel_dvo.c                 |  2 +-
> >  drivers/gpu/drm/i915/display/intel_dvo_dev.h             |  2 +-
> >  drivers/gpu/drm/i915/display/intel_hdmi.c                |  2 +-
> >  drivers/gpu/drm/i915/display/intel_lvds.c                |  2 +-
> >  drivers/gpu/drm/i915/display/intel_sdvo.c                |  2 +-
> >  drivers/gpu/drm/i915/display/intel_tv.c                  |  2 +-
> >  drivers/gpu/drm/i915/display/vlv_dsi.c                   |  2 +-
> >  drivers/gpu/drm/imx/ipuv3/imx-tve.c                      |  2 +-
> >  drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c      |  2 +-
> >  drivers/gpu/drm/nouveau/dispnv04/tvnv17.c                |  2 +-
> >  drivers/gpu/drm/nouveau/dispnv50/disp.c                  |  2 +-
> >  drivers/gpu/drm/nouveau/nouveau_connector.c              |  2 +-
> >  drivers/gpu/drm/qxl/qxl_display.c                        |  2 +-
> >  drivers/gpu/drm/radeon/atombios_dp.c                     |  2 +-
> >  drivers/gpu/drm/radeon/radeon_connectors.c               | 10 +++++-----
> >  drivers/gpu/drm/radeon/radeon_mode.h                     |  2 +-
> >  drivers/gpu/drm/rockchip/cdn-dp-core.c                   |  2 +-
> >  drivers/gpu/drm/rockchip/inno_hdmi.c                     |  4 ++--
> >  drivers/gpu/drm/rockchip/rk3066_hdmi.c                   |  2 +-
> >  drivers/gpu/drm/sti/sti_dvo.c                            |  2 +-
> >  drivers/gpu/drm/sti/sti_hda.c                            | 12 ++++++------
> >  drivers/gpu/drm/sti/sti_hdmi.c                           |  2 +-
> >  drivers/gpu/drm/tegra/dsi.c                              |  2 +-
> >  drivers/gpu/drm/tegra/hdmi.c                             |  2 +-
> >  drivers/gpu/drm/tegra/sor.c                              |  2 +-
> >  drivers/gpu/drm/vc4/vc4_txp.c                            |  2 +-
> >  drivers/gpu/drm/virtio/virtgpu_display.c                 |  2 +-
> >  drivers/gpu/drm/vmwgfx/vmwgfx_kms.c                      |  2 +-
> >  drivers/gpu/drm/vmwgfx/vmwgfx_kms.h                      |  2 +-
> >  drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c                     |  2 +-
> >  include/drm/display/drm_hdmi_state_helper.h              |  2 +-
> >  include/drm/drm_encoder_slave.h                          |  2 +-
> >  include/drm/drm_modeset_helper_vtables.h                 |  4 ++--
> >  71 files changed, 92 insertions(+), 93 deletions(-)
> > ---
> > base-commit: 4176cf5c5651c33769de83bb61b0287f4ec7719f
> > change-id: 20241115-drm-connector-mode-valid-const-ae3db0ef6cb7

-- 
Regards,

Laurent Pinchart

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