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[v2,0/4] drm/msm/dsi: stop using drm_panel directly

Message ID 20220711094320.368062-1-dmitry.baryshkov@linaro.org
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Series drm/msm/dsi: stop using drm_panel directly | expand

Message

Dmitry Baryshkov July 11, 2022, 9:43 a.m. UTC 
This series superseeds two existing patch series ([1] and [2]) and
merges them together in a single patchset to demonstrate necessity for
the first three patches.

The drm/msm/dsi driver has two separate code paths, one utilizing a
chain of drm_bridges and another one for directly interfacing the
drm_panel. We would have dropped the second path completely but for the
DSI DSC pps data.

To properly support DSI DSC the DSI sink driver (panel) has to pass DSC
pps data to the source (DSI host). The commit 0f40ba48de3b
("drm/msm/dsi: Pass DSC params to drm_panel") added a pointer to the DSC
data to the struct drm_panel. However this is not ideal.

First, this keeps DSC-supporting DSI sink bridges out of the picture
(like ANX7625 which support DSC decoding on the MIPI DSI inputs).

Second, this does not play well with the panel_bridge. Drivers depending
solely on the bridge chains will still have to lookup panel and fetch
data from it.

Last, but not least, the DSC data is not relevant for the wide variety
of panels including DPI and LVDS panels.

To solve all these problems, move struct drm_dsc_config pointer from
struct drm_panel to struct mipi_host_device. This way MIPI DSI host
driver receives DSC data during attach callback without additional
lookups.

The last commit drops the drm_panel code from msm/dsi driver, providing
code simplification.

Changes since v1 (of both patchsets):
 - Minor cleanups in the msm/dsi driver, dropping more now-unused code.

[1] https://patchwork.freedesktop.org/series/103411/
[2] https://patchwork.freedesktop.org/series/105995/

Dmitry Baryshkov (4):
  drm/mipi-dsi: pass DSC data through the struct mipi_dsi_device
  drm/msm/dsi: fetch DSC pps payload from struct mipi_dsi_device
  drm/panel: drop DSC pps pointer
  drm/msm/dsi: switch to DRM_PANEL_BRIDGE

 drivers/gpu/drm/msm/dsi/dsi.c         |  38 +---
 drivers/gpu/drm/msm/dsi/dsi.h         |  14 +-
 drivers/gpu/drm/msm/dsi/dsi_host.c    |  50 ++---
 drivers/gpu/drm/msm/dsi/dsi_manager.c | 264 ++------------------------
 include/drm/drm_mipi_dsi.h            |   2 +
 include/drm/drm_panel.h               |   7 -
 6 files changed, 39 insertions(+), 336 deletions(-)