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Date: Tue, 17 May 2016 09:05:01 +0200
From: Daniel Vetter <daniel@...ll.ch>
To: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc: Noralf Trønnes <noralf@...nnes.org>,
jsarha@...com, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] drm: Add helper for simple display pipeline
On Thu, May 12, 2016 at 09:36:14PM +0300, Ville Syrjälä wrote:
> On Thu, May 12, 2016 at 08:25:23PM +0200, Noralf Trønnes wrote:
> > Provides helper functions for drivers that have a simple display
> > pipeline. Plane, crtc and encoder are collapsed into one entity.
> >
> > Cc: jsarha@...com
> > Signed-off-by: Noralf Trønnes <noralf@...nnes.org>
> > ---
> >
> > Changes since v3:
> > - (struct drm_simple_display_pipe *)->funcs should be const
> >
> > Changes since v2:
> > - Drop Kconfig knob DRM_KMS_HELPER
> > - Expand documentation
> >
> > Changes since v1:
> > - Add DOC header and add to gpu.tmpl
> > - Fix docs: @funcs is optional, "negative error code",
> > "This hook is optional."
> > - Add checks to drm_simple_kms_plane_atomic_check()
> >
> > Documentation/DocBook/gpu.tmpl | 6 +
> > drivers/gpu/drm/Makefile | 2 +-
> > drivers/gpu/drm/drm_simple_kms_helper.c | 208 ++++++++++++++++++++++++++++++++
> > include/drm/drm_simple_kms_helper.h | 94 +++++++++++++++
> > 4 files changed, 309 insertions(+), 1 deletion(-)
> > create mode 100644 drivers/gpu/drm/drm_simple_kms_helper.c
> > create mode 100644 include/drm/drm_simple_kms_helper.h
> >
> > diff --git a/Documentation/DocBook/gpu.tmpl b/Documentation/DocBook/gpu.tmpl
> > index 4a0c599..cf3f5a8 100644
> > --- a/Documentation/DocBook/gpu.tmpl
> > +++ b/Documentation/DocBook/gpu.tmpl
> > @@ -1693,6 +1693,12 @@ void intel_crt_init(struct drm_device *dev)
> > !Edrivers/gpu/drm/drm_panel.c
> > !Pdrivers/gpu/drm/drm_panel.c drm panel
> > </sect2>
> > + <sect2>
> > + <title>Simple KMS Helper Reference</title>
> > +!Iinclude/drm/drm_simple_kms_helper.h
> > +!Edrivers/gpu/drm/drm_simple_kms_helper.c
> > +!Pdrivers/gpu/drm/drm_simple_kms_helper.c overview
> > + </sect2>
> > </sect1>
> >
> > <!-- Internals: kms properties -->
> > diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> > index 2bd3e5a..31b85df5 100644
> > --- a/drivers/gpu/drm/Makefile
> > +++ b/drivers/gpu/drm/Makefile
> > @@ -23,7 +23,7 @@ drm-$(CONFIG_AGP) += drm_agpsupport.o
> >
> > drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \
> > drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
> > - drm_kms_helper_common.o
> > + drm_kms_helper_common.o drm_simple_kms_helper.o
> >
> > drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
> > drm_kms_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fb_helper.o
> > diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
> > new file mode 100644
> > index 0000000..d45417a
> > --- /dev/null
> > +++ b/drivers/gpu/drm/drm_simple_kms_helper.c
> > @@ -0,0 +1,208 @@
> > +/*
> > + * Copyright (C) 2016 Noralf Trønnes
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License as published by
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + */
> > +
> > +#include <drm/drmP.h>
> > +#include <drm/drm_atomic.h>
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_crtc_helper.h>
> > +#include <drm/drm_plane_helper.h>
> > +#include <drm/drm_simple_kms_helper.h>
> > +#include <linux/slab.h>
> > +
> > +/**
> > + * DOC: overview
> > + *
> > + * This helper library provides helpers for drivers for simple display
> > + * hardware.
> > + *
> > + * drm_simple_display_pipe_init() initializes a simple display pipeline
> > + * which has only one full-screen scanout buffer feeding one output. The
> > + * pipeline is represented by struct &drm_simple_display_pipe and binds
> > + * together &drm_plane, &drm_crtc and &drm_encoder structures into one fixed
> > + * entity. Some flexibility for code reuse is provided through a separately
> > + * allocated &drm_connector object and supporting optional &drm_bridge
> > + * encoder drivers.
> > + */
> > +
> > +static const struct drm_encoder_funcs drm_simple_kms_encoder_funcs = {
> > + .destroy = drm_encoder_cleanup,
> > +};
> > +
> > +static void drm_simple_kms_crtc_enable(struct drm_crtc *crtc)
> > +{
> > + struct drm_simple_display_pipe *pipe;
> > +
> > + pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
> > + if (!pipe->funcs || !pipe->funcs->enable)
> > + return;
> > +
> > + pipe->funcs->enable(pipe, crtc->state);
> > +}
> > +
> > +static void drm_simple_kms_crtc_disable(struct drm_crtc *crtc)
> > +{
> > + struct drm_simple_display_pipe *pipe;
> > +
> > + pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
> > + if (!pipe->funcs || !pipe->funcs->disable)
> > + return;
> > +
> > + pipe->funcs->disable(pipe);
> > +}
> > +
> > +static const struct drm_crtc_helper_funcs drm_simple_kms_crtc_helper_funcs = {
> > + .disable = drm_simple_kms_crtc_disable,
> > + .enable = drm_simple_kms_crtc_enable,
> > +};
> > +
> > +static const struct drm_crtc_funcs drm_simple_kms_crtc_funcs = {
> > + .reset = drm_atomic_helper_crtc_reset,
> > + .destroy = drm_crtc_cleanup,
> > + .set_config = drm_atomic_helper_set_config,
> > + .page_flip = drm_atomic_helper_page_flip,
> > + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> > + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> > +};
> > +
> > +static int drm_simple_kms_plane_atomic_check(struct drm_plane *plane,
> > + struct drm_plane_state *plane_state)
> > +{
> > + struct drm_rect src = {
> > + .x1 = plane_state->src_x,
> > + .y1 = plane_state->src_y,
> > + .x2 = plane_state->src_x + plane_state->src_w,
> > + .y2 = plane_state->src_y + plane_state->src_h,
> > + };
> > + struct drm_rect dest = {
> > + .x1 = plane_state->crtc_x,
> > + .y1 = plane_state->crtc_y,
> > + .x2 = plane_state->crtc_x + plane_state->crtc_w,
> > + .y2 = plane_state->crtc_y + plane_state->crtc_h,
> > + };
> > + struct drm_rect clip = { 0 };
> > + struct drm_simple_display_pipe *pipe;
> > + struct drm_crtc_state *crtc_state;
> > + bool visible;
> > + int ret;
> > +
> > + pipe = container_of(plane, struct drm_simple_display_pipe, plane);
> > + crtc_state = drm_atomic_get_existing_crtc_state(plane_state->state,
> > + &pipe->crtc);
> > + if (crtc_state->enable != !!plane_state->crtc)
> > + return -EINVAL; /* plane must match crtc enable state */
> > +
> > + if (!crtc_state->enable)
> > + return 0; /* nothing to check when disabling or disabled */
> > +
> > + clip.x2 = crtc_state->adjusted_mode.hdisplay;
> > + clip.y2 = crtc_state->adjusted_mode.vdisplay;
> > + ret = drm_plane_helper_check_update(plane, &pipe->crtc,
> > + plane_state->fb,
> > + &src, &dest, &clip,
> > + DRM_PLANE_HELPER_NO_SCALING,
> > + DRM_PLANE_HELPER_NO_SCALING,
> > + false, true, &visible);
> > + if (ret)
> > + return ret;
> > +
> > + if (!visible)
> > + return -EINVAL;
> > +
> > + if (!pipe->funcs || !pipe->funcs->check)
> > + return 0;
> > +
> > + return pipe->funcs->check(pipe, plane_state, crtc_state);
> > +}
>
> What's anyone supposed to do with this when the clipped coordinates
> aren't even passed/stored anywhere?
It disallows positioning and scaling, so shouldn't ever need to have the
clipped area?
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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