linux-kernel - [PATCH v5 0/3] Support non-default LVDS data mapping for simple panel

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Date:   Fri, 29 Sep 2023 14:33:30 +0200
From:   Johannes Zink <j.zink@...gutronix.de>
To:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>
Cc:     kernel test robot <lkp@...el.com>,
        Dan Carpenter <error27@...il.com>,
        patchwork-jzi@...gutronix.de, kernel@...gutronix.de,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Johannes Zink <j.zink@...gutronix.de>,
        Conor Dooley <conor.dooley@...rochip.com>
Subject: [PATCH v5 0/3] Support non-default LVDS data mapping for simple
 panel

Some LVDS panels, such as the innolux,g101ice-l01 support multiple LVDS
data mapping modes, which can be configured by strapping a dataformat
pin on the display to a specific voltage.

This can be particularly useful for using the jeida-18 format, which
requires only 3 instead of 4 LVDS lanes.

This series moves the data-mapping property for LVDS panels in a
separate file and optionally adds it to simple-panel when matching to
the innolux,g101ice-l01 compatible. This property allows to override
the default data mapping set in the panel description in simple-panel.

The last patch in this series actually adds the driver support for
parsing the data format override device tree property and modifying the
corresponding values for bit per color and media bus format in the panel
descriptor.

Best regards
Johannes

---

Changelog:

v4 -> v5:  - no changes, but added the reviewed-by-tags from v3 that
             were lost in v3/v4
	   - Link to v4: https://lore.kernel.org/r/20230523-simplepanel_support_nondefault_datamapping-v4-0-e6e7011f34b5@pengutronix.de

v3 -> v4:  - driver: worked in Dan's Feedback:
             - return with proper error in case the call into
	       panel_simple_override_nondefault_lvds_datamapping()
	       failed
	     - drop the unneeded and ambiguous ret local value
	    - Link to v3: https://lore.kernel.org/r/20230523-simplepanel_support_nondefault_datamapping-v3-0-78ede374d3d9@pengutronix.de

v2 -> v3:  - dt bindings: Worked in Conor's and Laurent's Feedback
	     (thanks for your review): Drop the chomping indicator
	   - dt bindings: Worked in Laurent's Feedback: fix typos
	   - driver: worked in Laurent's review findings:
	     - extract function for fixing up the bus format
	     - only call this function on LVDS panels
	     - fix typo
           - Link to v2: https://lore.kernel.org/r/20230523-simplepanel_support_nondefault_datamapping-v2-0-87196f0d0b64@pengutronix.de

v1 -> v2:  - dt bindings: Worked in Rob's review findings (thanks for your
             review), refactored to use common include instead of duplication
           - driver: added missing error unwinding goto, as found by Dan
             Carpenter's test robot:
             Reported-by: kernel test robot <lkp@...el.com>
             Reported-by: Dan Carpenter <error27@...il.com>
             Link: https://lore.kernel.org/r/202304160359.4LHmFOlU-lkp@intel.com/

To: David Airlie <airlied@...il.com>
To: Daniel Vetter <daniel@...ll.ch>
To: Rob Herring <robh+dt@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
To: Conor Dooley <conor+dt@...nel.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Thierry Reding <thierry.reding@...il.com>
To: Neil Armstrong <neil.armstrong@...aro.org>
To: Sam Ravnborg <sam@...nborg.org>
Cc: patchwork-jzi@...gutronix.de
Cc: kernel@...gutronix.de
Cc: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Cc: dri-devel@...ts.freedesktop.org
Cc: devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Johannes Zink <j.zink@...gutronix.de>

---

---
Johannes Zink (3):
      dt-bindings: display: move LVDS data-mapping definition to separate file
      dt-bindings: display: simple: support non-default data-mapping
      drm/panel-simple: allow LVDS format override

 .../bindings/display/lvds-data-mapping.yaml        | 84 ++++++++++++++++++++++
 .../devicetree/bindings/display/lvds.yaml          | 77 +++-----------------
 .../bindings/display/panel/panel-simple.yaml       | 26 ++++++-
 drivers/gpu/drm/panel/panel-simple.c               | 53 ++++++++++++++
 4 files changed, 171 insertions(+), 69 deletions(-)
---
base-commit: 79fb229b8810071648b65c37382aea7819a5f935
change-id: 20230523-simplepanel_support_nondefault_datamapping-13c3f2ea28f8

Best regards,
-- 
Johannes Zink <j.zink@...gutronix.de>