This patch series adds a DRM driver for the Solomon OLED SSD1305, SSD1306, SSD1307 and SSD1309 displays. It is a port of the ssd1307fb fbdev driver.
Using the DRM fb emulation, all the tests from Geert Uytterhoeven's fbtest (https://git.kernel.org/pub/scm/linux/kernel/git/geert/fbtest.git) passes. I've also tested it using the display as a VT output and even though fbcon seems to work, it is mostly unusable on a 128x64 SSD1306 display. This is a v3 that addresses all the issues pointed in v2. Thanks a lot to everyone that gave me feedback and reviews. Patch #1 splits per-line conversion logic in drm_fb_xrgb8888_to_gray8() to a separate drm_fb_xrgb8888_to_gray8_line() helper function. Patch #2 adds two new helpers, drm_fb_gray8_to_mono_reversed() to convert from grayscale to monochrome and a drm_fb_xrgb8888_to_mono_reversed() to convert from XR24 to monochrome. The latter internally converts each line first to gray8 and then to reversed monochrome. Patch #3 adds the driver. This only has the core support but doesn't have any bus specific code, separate drivers are needed for the transport used. Patch #4 adds a driver to use the I2C bus to communicate with the device and patch #5 adds a similar driver for SPI. This one is a WIP and wasn't tested. I'm including for people to test and modify for their displays. Patch #6 just adds a MAINTAINERS entry for the DRM driver and patch #7 adds myself as a co-maintainer of the existing Device Tree binding for ssd1307fb, since the same is shared between the fbdev and DRM drivers. Best regards, Javier Changes in v3: - Add a drm_fb_xrgb8888_to_gray8_line() helper function (Thomas Zimmermann) - Also add a drm_fb_xrgb8888_to_mono_reversed() helper (Thomas Zimmermann) - Split lines copy to drm_fb_gray8_to_mono_reversed_line() (Thomas Zimmermann) - Handle case where the source buffer is not aligned to 8 (Thomas Zimmermann) - Move driver from tiny sub-dir to drivers/gpu/drm/solomon (Sam Ravnborg) - Split driver in a bus agnostic core and bus specific (Andy Shevchenko) - Use regmap to access the chip registers (Andy Shevchenko) - Remove unnecessary blank lines (Andy Shevchenko) - Remove unneeded inline specifier in functions (Andy Shevchenko) - Add a comment about always returning a single mode (Andy Shevchenko) - Change write command logic to use do while loop (Andy Shevchenko) - Use "firmware description" instead of "device tree" (Andy Shevchenko) - Use return foo() instead of returning the return value (Andy Shevchenko) - Don't split lines longer than 80 chars if makes less readable (Andy Shevchenko) - Remove redundant else statements in .mode_valid callback (Andy Shevchenko) - Rename powero{n,ff}() functions to power_o{n,ff)() (Andy Shevchenko) - Use dev_err_probe() to prevent spam logs on probe deferral (Andy Shevchenko) - Remove ',' after sentinel terminator in array (Andy Shevchenko) - Fix a bug when doing partial updates (Geert Uytterhoeven) - Add a separate driver for SSD130X chips I2C support (Andy Shevchenko) - Add a separate driver for SSD130X chips SPI support (Andy Shevchenko) - Adapt MAINTAINERS entry to point to the new drivers/gpu/drm/solomon directory. Changes in v2: - Drop patch that was adding a DRM_MODE_CONNECTOR_I2C type. - Invert order of backlight {en,dis}able and display {on,off} (Sam Ravnborg) - Don't clear the screen and turn on display on probe (Sam Ravnborg) - Use backlight_get_brightness() macro to get BL brightness (Sam Ravnborg) - Use dev managed version of devm_backlight_device_register() (Sam Ravnborg) - Use dev_name(dev) for backlight name instead of an array (Sam Ravnborg) - Drop the .get_brightness callback since isn't needed (Sam Ravnborg) - Rename driver to ssd130x since supports a display family (Thomas Zimmermann) - Drop the TINY prefix from the Kconfig symbol (Thomas Zimmermann) - Sort the Kconfig symbol dependencies alphabetically (Thomas Zimmermann) - Rename struct ssd130x_array to struct ssd130x_i2c_msg (Thomas Zimmermann) - Rename struct ssd130x_i2c_msg .type member to .cmd (Thomas Zimmermann) - Use sizeof(*foo) instead of sizeof(struct foo) (Thomas Zimmermann) - Use struct_size() macro to calculate sizeof(*foo) + len (Thomas Zimmermann) - Use kcalloc() instead of kmalloc_array() + memset() (Thomas Zimmermann) - Use shadow plane helpers virtual screen support (Thomas Zimmermann) - Remove unused goto label in ssd1307_fb_blit_rect() (Thomas Zimmermann) - Use drm_set_preferred_mode() inset of manually set (Thomas Zimmermann) - Use shadow plane helpers virtual screen support (Thomas Zimmermann) - Remove unused goto label in ssd1307_fb_blit_rect() (Thomas Zimmermann) - Use drm_set_preferred_mode() inset of manually set (Thomas Zimmermann) - Reorganize code in probe to make it more legible (Thomas Zimmermann) - ssd130x_write_cmd() uses varargs to simplify I2C code (Thomas Zimmermann) - Move regulator/pwm init logic to display pipe enable callback. - Add Sam Ravnborg's acked-by to patch adding a MAINTAINERS entry (Sam Ravnborg) - Add myself as co-maintainer of the ssd1370fb DT binding (Sam Ravnborg). Javier Martinez Canillas (7): drm/format-helper: Add drm_fb_xrgb8888_to_gray8_line() drm/format-helper: Add drm_fb_{xrgb8888,gray8}_to_mono_reversed() drm: Add driver for Solomon SSD130X OLED displays drm/solomon: Add SSD130X OLED displays I2C support (WIP) drm/solomon: Add SSD130X OLED displays SPI support MAINTAINERS: Add entry for Solomon SSD130X OLED displays DRM driver dt-bindings: display: ssd1307fb: Add myself as binding co-maintainer .../bindings/display/solomon,ssd1307fb.yaml | 1 + MAINTAINERS | 7 + drivers/gpu/drm/Kconfig | 2 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/drm_format_helper.c | 188 +++- drivers/gpu/drm/solomon/Kconfig | 30 + drivers/gpu/drm/solomon/Makefile | 3 + drivers/gpu/drm/solomon/ssd130x-i2c.c | 117 +++ drivers/gpu/drm/solomon/ssd130x-spi.c | 114 +++ drivers/gpu/drm/solomon/ssd130x.c | 823 ++++++++++++++++++ drivers/gpu/drm/solomon/ssd130x.h | 76 ++ include/drm/drm_format_helper.h | 8 + 12 files changed, 1358 insertions(+), 12 deletions(-) create mode 100644 drivers/gpu/drm/solomon/Kconfig create mode 100644 drivers/gpu/drm/solomon/Makefile create mode 100644 drivers/gpu/drm/solomon/ssd130x-i2c.c create mode 100644 drivers/gpu/drm/solomon/ssd130x-spi.c create mode 100644 drivers/gpu/drm/solomon/ssd130x.c create mode 100644 drivers/gpu/drm/solomon/ssd130x.h -- 2.34.1
