linux-kernel - Re: [PATCH v7 0/9] drm/omap: Add virtual-planes support

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Message-ID: <797a3b9a-be04-26ef-9d1a-e5283198ab15@baylibre.com>
Date:   Tue, 30 Nov 2021 17:34:57 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     tomba@...nel.org
Cc:     linux-omap@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, khilman@...libre.com
Subject: Re: [PATCH v7 0/9] drm/omap: Add virtual-planes support

Hi Tomi,

On 17/11/2021 15:19, Neil Armstrong wrote:
> This patchset is the follow-up the v4 patchset from Benoit Parrot at [1].
> 
> This patch series adds virtual-plane support to omapdrm driver to allow the use
> of display wider than 2048 pixels.
> 
> In order to do so we introduce the concept of hw_overlay which can then be
> dynamically allocated to a plane. When the requested output width exceed what
> be supported by one overlay a second is then allocated if possible to handle
> display wider then 2048.
> 
> This series replaces an earlier series which was DT based and using statically
> allocated resources.
> 
> This implementation is inspired from the work done in msm/disp/mdp5
> driver.
> 
> Changes since v6 at [3]:
> - Patch 1: Added comment for drm_atomic_helper_check_plane_state, added Reviewed-by
> - Patch 2: added Reviewed-by
> - Patch 3: added Reviewed-by
> - Patch 4: added Reviewed-by
> - Patch 5: added Reviewed-by
> - Patch 6: No changes
> - Patch 7: No changes
> - Patch 8: Reformatted omap_plane_atomic_print_state() output for overlays
> - Patch 9: Added a comment of the utility of the local omap_atomic_update_normalize_zpos() + atomic_print_state() reformat
> 
> Changes since v5 at [2]:
> - Patch 1: renamed width/height_fp to max_width/height
> - Patch 2: no changes
> - Patch 3: removed possible_crtcs stuff,
> 	added cleanup on failure to allocate,
> 	removed name in omap_plane struct & plane_id_to_name in omap_plane.c,
> 	switched all omap_plane->name to plane->name or omap_plane->id
> - Patch 4: aligned omap_plane_atomic_duplicate_state the the crtc style
> - Patch 5: removed glob_obj_lock & reformated global state declaration in omap_drv.h
> - Patch 6: moved drm_atomic_helper_check_plane_state() from atomic_check() in separate commit,
> 	removed zpos change, updated debug messages to be useful,
> 	renamed omap_overlay_disable() to omap_overlay_update_state(),
> 	added useful comments for omap_overlay_assign() & omap_overlay_update_state(),
> 	simplified omap_overlay_assign() & omap_overlay_update_state() for actual use-cases,
> 	refactored omap_plane_atomic_check() changes to be cleaner & simpler
> - Patch 7: no changes (except possible_crtcs print removal)
> - Patch 8: Reformated omap_plane_atomic_check() & omap_overlay_assign() changes to match previous patches layout 
> 
> Changes since v4 at [1]:
> - rebased on v5.15-rc2
> - adapted to drm_atomic_get_new/old_plane_state()
> - tested on Beagle-x15
> - checked for non-regression on Beagle-x15
> - removed unused "state" variable in omap_global_state
> 
> [1] https://lore.kernel.org/all/20181012201703.29065-1-bparrot@ti.com/
> [2] https://lore.kernel.org/all/20210923070701.145377-1-narmstrong@baylibre.com/
> [3] https://lore.kernel.org/all/20211018142842.2511200-1-narmstrong@baylibre.com
> 
> Benoit Parrot (8):
>   drm/omap: Add ability to check if requested plane modes can be
>     supported
>   drm/omap: Add ovl checking funcs to dispc_ops
>   drm/omap: introduce omap_hw_overlay
>   drm/omap: omap_plane: subclass drm_plane_state
>   drm/omap: Add global state as a private atomic object
>   drm/omap: dynamically assign hw overlays to planes
>   drm/omap: add plane_atomic_print_state support
>   drm/omap: Add a 'right overlay' to plane state
> 
> Neil Armstrong (1):
>   drm/omap: add sanity plane state check
> 
>  drivers/gpu/drm/omapdrm/Makefile       |   1 +
>  drivers/gpu/drm/omapdrm/dss/dispc.c    |  31 ++-
>  drivers/gpu/drm/omapdrm/dss/dss.h      |   5 +
>  drivers/gpu/drm/omapdrm/omap_drv.c     | 196 +++++++++++++-
>  drivers/gpu/drm/omapdrm/omap_drv.h     |  24 ++
>  drivers/gpu/drm/omapdrm/omap_fb.c      |  33 ++-
>  drivers/gpu/drm/omapdrm/omap_fb.h      |   4 +-
>  drivers/gpu/drm/omapdrm/omap_overlay.c | 212 +++++++++++++++
>  drivers/gpu/drm/omapdrm/omap_overlay.h |  35 +++
>  drivers/gpu/drm/omapdrm/omap_plane.c   | 349 +++++++++++++++++++++----
>  drivers/gpu/drm/omapdrm/omap_plane.h   |   1 +
>  11 files changed, 832 insertions(+), 59 deletions(-)
>  create mode 100644 drivers/gpu/drm/omapdrm/omap_overlay.c
>  create mode 100644 drivers/gpu/drm/omapdrm/omap_overlay.h
> 
> 
> base-commit: 49c39ec4670a8f045729e3717af2e1a74caf89a5
> 


Gentle ping,

Neil