Hi all, The native display format of ssd1306 OLED displays is monochrome light-on-dark (R1). This patch series adds support for the R1 buffer format to both the ssd130x DRM driver and the FB helpers, so monochrome applications (including fbdev emulation and the text console) can avoid the overhead of back-and-forth conversions between R1 and XR24. This series is based on drm-misc/for-linux-next with [1] applied, and consists of 4 parts: - Patches 1-3 contain miscellaneous fixes, - Patch 4 adds R1 support to the ssd130x DRM driver, - Patches 5-6 update the DRM client and FB helper code to avoid calling drm_mode_legacy_fb_format() where the exact buffer format is already known, to prepare for R1 support, - Patch 7 adds support for R1 to fbdev emulation and the text console, - Patch 8 switches ssd130x to R1 for fbdev emulation and the text console. This has been tested on an Adafruit FeatherWing 128x32 OLED, connected to an OrangeCrab ECP5 FPGA board running a 64 MHz VexRiscv RISC-V softcore, using the fbdev text console. Thanks for your comments! P.S. Note that the biggest hurdle was the copious use of the drm_mode_legacy_fb_format() helper in various places. This helper cannot decide between C1 and R1 without knowledge of the capabilities of the full display pipeline. Instead of special-casing its return value in three callers, I did so in only one place, and got rid of two of these calls in the call chain. I think Thomas' grand plan is to replace preferred_{bpp,depth} by a preferred fourcc format? That would simplify things a lot... [1] "[PATCH] drm/ssd130x: Change pixel format used to compute the buffer size" https://lore.kernel.org/all/20230713085859.907127-1-javierm@xxxxxxxxxx Geert Uytterhoeven (8): drm/ssd130x: Fix pitch calculation in ssd130x_fb_blit_rect() drm/dumb-buffers: Fix drm_mode_create_dumb() for bpp < 8 [RFC] drm/ssd130x: Bail out early if data_array is not yet available drm/ssd130x: Add support for DRM_FORMAT_R1 drm/client: Convert drm_mode_create_dumb() to drm_mode_addfb2() drm/fb-helper: Pass buffer format via drm_fb_helper_surface_size drm/fb-helper: Add support for DRM_FORMAT_R1 drm/ssd130x: Switch preferred_bpp/depth to 1 drivers/gpu/drm/drm_client.c | 13 +++--- drivers/gpu/drm/drm_dumb_buffers.c | 3 +- drivers/gpu/drm/drm_fb_helper.c | 42 ++++++++++++++----- drivers/gpu/drm/drm_fbdev_generic.c | 9 ++--- drivers/gpu/drm/solomon/ssd130x.c | 62 ++++++++++++++++++++--------- include/drm/drm_fb_helper.h | 2 + 6 files changed, 87 insertions(+), 44 deletions(-) -- 2.34.1 Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds