linux-kernel - [RFC PATCH 0/3] drm: atmel-hlcdc: clut support

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Date:   Fri, 16 Jun 2017 11:12:24 +0200
From:   Peter Rosin <peda@...ntia.se>
To:     linux-kernel@...r.kernel.org
Cc:     Peter Rosin <peda@...ntia.se>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        dri-devel@...ts.freedesktop.org
Subject: [RFC PATCH 0/3] drm: atmel-hlcdc: clut support

Hi!

This series adds support for an 8-bit clut mode in the atmel-hlcdc
driver.

For various reasons I have only tested it with the fbdev interface,
and am therefore not really sure if it works w/o patch 2 and 3.

Also, when using it with the fbdev emulation layer, something seems
to allocate the first 16 clut entries, which throws my users of
ioctl(fb, FBIOPUTCMAP, ...) when index 0 in the given clut is
really pixel value 16. If anyone can shed some light on that, I'd
be most greatful!

Further, I suspect I might need to lock the crtc state when accessing
it in patch 3/3?

Cheers,
peda

Peter Rosin (3):
  atmel-hlcdc: add support for 8-bit color lookup table mode
  drm/fb-cma-helper: expose more of fb cma guts
  atmel-hlcdc: add clut support for legacy fbdev

 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c  | 97 +++++++++++++++++++++++++
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c    | 25 ++++++-
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h    | 20 +++++
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c |  5 ++
 drivers/gpu/drm/drm_fb_cma_helper.c             | 55 +++++++++++---
 include/drm/drm_fb_cma_helper.h                 |  8 +-
 6 files changed, 197 insertions(+), 13 deletions(-)

-- 
2.1.4