kernel/include/drm/drm_panel.h, branch linux-5.11.y

drm/panel: Add helper for reading DT rotation

2020-08-16T15:12:18Z

This adds a helper function for reading the rotation (panel orientation) from the device tree. Reviewed-by: Sam Ravnborg Tested-by: Dmitry Osipenko Signed-off-by: Derek Basehore Signed-off-by: Dmitry Osipenko Signed-off-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20200813215609.28643-2-digetx@gmail.com

drm: Remove unnecessary drm_panel_attach and drm_panel_detach

2020-08-08T07:06:33Z

These functions are now empty and no longer useful so remove the functions and their uses. Signed-off-by: Joe Perches Cc: Bernard Zhao Cc: Maarten Lankhorst Cc: Maxime Ripard , Cc: Thomas Zimmermann Cc: Thierry Reding Cc: David Airlie Cc: Daniel Vetter Cc: Linus Walleij Cc: Icenowy Zheng , Cc: Jagan Teki Cc: Laurent Pinchart Cc: Robert Chiras Cc: dri-devel@lists.freedesktop.org, Cc: linux-kernel@vger.kernel.org Cc: opensource.kernel@vivo.com Signed-off-by: Sam Ravnborg # Fixed build and a few warnings Link: https://patchwork.freedesktop.org/patch/msgid/9e13761020750b1ce2f1fabee23ef6e2a2942882.camel@perches.com

drm/panel: remove return value of function drm_panel_add

2020-08-02T06:59:06Z

The function "int drm_panel_add(struct drm_panel *panel)" always returns 0, this return value is meaningless. Also, there is no need to check return value which calls "drm_panel_add and", error branch code will never run. Signed-off-by: Bernard Zhao Reviewed-by: Linus Walleij Signed-off-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20200801120216.8488-1-bernard@vivo.com

drm/drm_panel: fix export of drm_panel_of_backlight, try #3

2020-01-12T20:16:30Z

Making this IS_REACHABLE() was still wrong, as that just determines whether the lower-level backlight code would be reachable from the panel driver. However, with CONFIG_DRM=y and CONFIG_BACKLIGHT_CLASS_DEVICE=m, the drm_panel_of_backlight is left out of drm_panel.o but the condition tells the driver that it is there, leading to multiple link errors such as ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-sitronix-st7701.ko] undefined! ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-sharp-ls043t1le01.ko] undefined! ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-seiko-43wvf1g.ko] undefined! ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-ronbo-rb070d30.ko] undefined! ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-rocktech-jh057n00900.ko] undefined! ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.ko] undefined! ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.ko] undefined! Change the condition to check for whether the function was actually part of the drm module. This version of the patch survived a few hundred randconfig builds, so I have a good feeling this might be the last one for the export. Fixes: 4a34a9dcec94 ("drm/drm_panel: Fix EXPORT of drm_panel_of_backlight() one more time") Fixes: 907aa265fde6 ("drm/drm_panel: fix EXPORT of drm_panel_of_backlight") Fixes: 152dbdeab1b2 ("drm/panel: add backlight support") Signed-off-by: Arnd Bergmann Signed-off-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20200107203231.920256-1-arnd@arndb.de

drm/drm_panel: Fix EXPORT of drm_panel_of_backlight() one more time

2019-12-17T19:39:33Z

The initial commit followed by the fix didn't take into consideration the case: CONFIG_DRM_PANEL=y CONFIG_BACKLIGHT_CLASS_DEVICE=m CONFIG_DRM_I915=y where symbol devm_of_find_backlight() is not reachable from DRM subsystem. Quick fix is to avoid drm_panel_of_backlight() from exporting in such case. Fixes: 907aa265fde6 ("drm/drm_panel: fix EXPORT of drm_panel_of_backlight") Reported-by: Randy Dunlap Acked-by: Randy Dunlap # build-tested Cc: Linus Walleij Cc: Sam Ravnborg Cc: Laurent Pinchart Cc: Thierry Reding Cc: Maarten Lankhorst Cc: Sean Paul Cc: David Airlie Cc: Daniel Vetter Cc: Maxime Ripard Cc: dri-devel@lists.freedesktop.org Signed-off-by: Andy Shevchenko Signed-off-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20191217140721.42432-1-andriy.shevchenko@linux.intel.com

drm/panel: drop drm_device from drm_panel

2019-12-09T21:57:26Z

The panel drivers used drm_panel.drm for two purposes: 1) Argument to drm_mode_duplicate() 2) drm->dev was used in error messages The first usage is replaced with drm_connector.dev - drm_connector is already connected to a drm_device and we have a valid connector The second usage is replaced with drm_panel.dev - this makes drivers more consistent in their dev argument used for dev_err() and friends With these replacements there are no more uses of drm_panel.drm, so it is removed from struct drm_panel. With this change drm_panel_attach() and drm_panel_detach() no longer have any use as they are empty functions. v2: - editorial correction in changelog (Laurent) Signed-off-by: Sam Ravnborg Reviewed-by: Laurent Pinchart Reviewed-by: Linus Walleij Cc: Thierry Reding Cc: Laurent Pinchart Cc: Sam Ravnborg Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: David Airlie Cc: Daniel Vetter Cc: Linus Walleij Cc: Jagan Teki Cc: Stefan Mavrodiev Cc: Robert Chiras Cc: "Guido Günther" Cc: Purism Kernel Team Link: https://patchwork.freedesktop.org/patch/msgid/20191207140353.23967-8-sam@ravnborg.org

drm/panel: decouple connector from drm_panel

2019-12-09T21:57:26Z

To facilitate moving connector creation to display drivers, decouple the drm_connector from drm_panel. This patch adds a connector argument to drm_panel_get_modes(). All users of drm_panel_get_modes() already had the connector available, so updating users was trivial. With this patch drm_panel no longer keeps a reference to the drm_connector. Signed-off-by: Sam Ravnborg Reviewed-by: Laurent Pinchart Reviewed-by: Linus Walleij Acked-by: Jeffrey Hugo Cc: Thierry Reding Cc: Laurent Pinchart Cc: Sam Ravnborg Cc: Andrzej Hajda Cc: Neil Armstrong Cc: Jonas Karlman Cc: Jernej Skrabec Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: David Airlie Cc: Daniel Vetter Cc: Inki Dae Cc: Joonyoung Shim Cc: Seung-Woo Kim Cc: Kyungmin Park Cc: Kukjin Kim Cc: Krzysztof Kozlowski Cc: Stefan Agner Cc: Alison Wang Cc: Philipp Zabel Cc: Shawn Guo Cc: Sascha Hauer Cc: Pengutronix Kernel Team Cc: Fabio Estevam Cc: NXP Linux Team Cc: CK Hu Cc: Matthias Brugger Cc: Marek Vasut Cc: Tomi Valkeinen Cc: Kieran Bingham Cc: Sandy Huang Cc: "Heiko Stübner" Cc: Benjamin Gaignard Cc: Vincent Abriou Cc: Chen-Yu Tsai Cc: Jonathan Hunter Cc: Torsten Duwe Cc: Vasily Khoruzhick Cc: Icenowy Zheng Cc: Sean Paul Cc: Linus Walleij Cc: Boris Brezillon Cc: Hariprasad Kelam Cc: Alexios Zavras Cc: Brian Masney Cc: Rob Clark Cc: Thomas Gleixner Cc: Allison Randal Cc: Shayenne Moura Cc: Abhinav Kumar Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-mediatek@lists.infradead.org Cc: linux-renesas-soc@vger.kernel.org Cc: linux-rockchip@lists.infradead.org Cc: linux-tegra@vger.kernel.org Link: https://patchwork.freedesktop.org/patch/msgid/20191207140353.23967-7-sam@ravnborg.org

drm/panel: add drm_connector argument to get_modes()

2019-12-09T21:57:26Z

Today the bridge creates the drm_connector, but that is planned to be moved to the display drivers. To facilitate this, update drm_panel_funcs.get_modes() to take drm_connector as an argument. All panel drivers implementing get_modes() are updated. v2: - drop accidental change (Laurent) - update docs for get_modes (Laurent) Signed-off-by: Sam Ravnborg Reviewed-by: Laurent Pinchart Reviewed-by: Linus Walleij Cc: Thierry Reding Cc: Laurent Pinchart Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: David Airlie Cc: Daniel Vetter Cc: Linus Walleij Cc: Jagan Teki Cc: Stefan Mavrodiev Cc: Robert Chiras Cc: "Guido Günther" Cc: Purism Kernel Team Link: https://patchwork.freedesktop.org/patch/msgid/20191207140353.23967-6-sam@ravnborg.org

drm/panel: add backlight support

2019-12-09T21:57:26Z

Panels often support backlight as specified in a device tree. Update the drm_panel infrastructure to support this to simplify the drivers. With this the panel driver just needs to add the following to the probe() function: err = drm_panel_of_backlight(panel); if (err) return err; Then drm_panel will handle all the rest. There is one caveat with the backlight support. If drm_panel_(enable|disable) are called multiple times in a row then backlight_(enable|disable) will be called multiple times. The above will happen when a panel drivers unconditionally calls drm_panel_disable() in their shutdown() function, whan the panel is already disabled and then shutdown() is called. Reading the backlight code it seems safe to call the backlight_(enable|disable) several times. v3: - Improve comments, fix grammar (Laurent) - Do not fail in drm_panel_of_backlight() if no DT support (Laurent) - Log if backlight_(enable|disable) fails (Laurent) - Improve drm_panel_of_backlight() docs - Updated changelog with backlight analysis (triggered by Laurent) v2: - Drop test of CONFIG_DRM_PANEL in header-file (Laurent) - do not enable backlight if ->enable() returns an error Signed-off-by: Sam Ravnborg Reviewed-by: Laurent Pinchart Cc: Thierry Reding Cc: Laurent Pinchart Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Sean Paul Cc: David Airlie Cc: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20191207140353.23967-3-sam@ravnborg.org

drm/drm_panel: no error when no callback

2019-12-09T21:57:26Z

The callbacks in drm_panel_funcs are optional, so do not return an error just because no callback is assigned. v2: - Document what functions in drm_panel_funcs are optional (Laurent) - Return -EOPNOTSUPP if get_modes() is not assigned (Laurent) (Sam: -EOPNOTSUPP seems to best error code in this situation) Signed-off-by: Sam Ravnborg Reviewed-by: Laurent Pinchart Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Thierry Reding Cc: Sam Ravnborg Cc: David Airlie Cc: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20191207140353.23967-2-sam@ravnborg.org