Le Mon, 19 Jun 2017 09:44:25 +0200, Peter Rosin <p...@axentia.se> a écrit :
> DRM drivers supporting clut may want a convenient way to only use > non-default .gamma_set and .gamma_get ops in the drm_fb_helper_funcs > in order to avoid the following > > /* > * The driver really shouldn't advertise pseudo/directcolor > * visuals if it can't deal with the palette. > */ > if (WARN_ON(!fb_helper->funcs->gamma_set || > !fb_helper->funcs->gamma_get)) > return -EINVAL; > > warning in drm_fb_helper.c:setcolreg(). Did you read the FIXME in the struct doc [1]? Shouldn't we try to move to this generic approach instead of exposing fb_cma internals? You could probably mimic (or re-use) what's done in drm_mode_gamma_set/get_ioctl() [2]. [1]http://elixir.free-electrons.com/linux/v4.12-rc6/source/include/drm/drm_fb_helper.h#L110 [2]http://elixir.free-electrons.com/linux/v4.12-rc6/source/drivers/gpu/drm/drm_color_mgmt.c#L214
