linux-kernel - [PATCH 0/4] drm/tiny: Add driver for Solomon SSD1307 OLED displays

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Date:   Mon, 31 Jan 2022 21:12:20 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-fbdev@...r.kernel.org, Maxime Ripard <maxime@...no.tech>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        dri-devel@...ts.freedesktop.org,
        Noralf Trønnes <noralf@...nnes.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-pwm@...r.kernel.org
Subject: [PATCH 0/4] drm/tiny: Add driver for Solomon SSD1307 OLED displays

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:

     ./fbtest -f /dev/fb1
    Using drawops cfb32 (32 bpp packed pixels)
    Available visuals:
      Monochrome
      Grayscale 256
      Truecolor 8:8:8:0
    Using visops truecolor
    Running all tests
    test001: PASSED
    test002: PASSED
    test003: PASSED
    test004: PASSED
    test005: PASSED
    test006: PASSED
    test008: PASSED
    test009: PASSED
    test010: PASSED
    Benchmarking... 10x10 squares: 412.99 Mpixels/s
    Benchmarking... 20x20 squares: 857.46 Mpixels/s
    Benchmarking... 50x50 squares: 1593.51 Mpixels/s
    test012: PASSED
    Benchmarking... R5 circles: 237.07 Mpixels/s
    Benchmarking... R10 circles: 501.24 Mpixels/s
    Benchmarking... R25 circles: 947.86 Mpixels/s
    test013: PASSED

Patch #1 adds an I2C connector type since currently there isn't one and
I2C drivers use DRM_MODE_CONNECTOR_Unknown or DRM_MODE_CONNECTOR_VIRTUAL.

Patch #2 adds a drm_fb_gray8_to_mono_reversed() DRM format helper since
most DRM/KMS user-space don't support bpp 1 displays, so drivers expose
a common format that's converted to greyscale and then to monochrome.

Patch #3 adds the driver. The name ssd1307 was used instead of ssd130x
(which would be more accurate) to avoid confusion for users who want to
migrate from the existing ssd1307fb fbdev driver.

Patch #4 just adds a MAINTAINERS entry for this new DRM driver.

Best regards,
Javier


Javier Martinez Canillas (4):
  drm: Add I2C connector type
  drm/format-helper: Add drm_fb_gray8_to_mono_reversed()
  drm/tiny: Add driver for Solomon SSD1307 OLED displays
  MAINTAINERS: Add entry for Solomon SSD1307 OLED displays DRM driver

 MAINTAINERS                         |   7 +
 drivers/gpu/drm/drm_connector.c     |   1 +
 drivers/gpu/drm/drm_format_helper.c |  35 +
 drivers/gpu/drm/tiny/Kconfig        |  12 +
 drivers/gpu/drm/tiny/Makefile       |   1 +
 drivers/gpu/drm/tiny/ssd1307.c      | 976 ++++++++++++++++++++++++++++
 include/drm/drm_format_helper.h     |   2 +
 include/uapi/drm/drm_mode.h         |   1 +
 8 files changed, 1035 insertions(+)
 create mode 100644 drivers/gpu/drm/tiny/ssd1307.c

-- 
2.34.1