Re: [PATCH v2 2/3] drm/exynos: use generic code for managing zpos plane property

[Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>]

Hello,

On 2016-01-11 16:13, Daniel Vetter wrote:
> On Mon, Jan 11, 2016 at 12:03:04PM +0100, Marek Szyprowski wrote:
> > This patch replaces zpos property handling custom code in Exynos DRM
> > driver with calls to generic DRM code.
> >
> > Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> > ---
> >   drivers/gpu/drm/exynos/exynos_drm_drv.h   |  1 -
> >   drivers/gpu/drm/exynos/exynos_drm_plane.c | 66 +++++++------------------------
> >   drivers/gpu/drm/exynos/exynos_mixer.c     | 19 +++++++--
> >   3 files changed, 30 insertions(+), 56 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
> > index 17b5ded72ff1..244ae6c4482c 100644
> > --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
> > +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
> > @@ -217,7 +217,6 @@ struct exynos_drm_private {
> >   	 * this array is used to be aware of which crtc did it request vblank.
> >   	 */
> >   	struct drm_crtc *crtc[MAX_CRTC];
> > -	struct drm_property *plane_zpos_property;
> >   
> >   	unsigned long da_start;
> >   	unsigned long da_space_size;
> > diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c
> > index d86227236f55..ba46bc3de796 100644
> > --- a/drivers/gpu/drm/exynos/exynos_drm_plane.c
> > +++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c
> > @@ -137,9 +137,9 @@ static void exynos_drm_plane_reset(struct drm_plane *plane)
> >   
> >   	exynos_state = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
> >   	if (exynos_state) {
> > -		exynos_state->zpos = exynos_plane->config->zpos;
> >   		plane->state = &exynos_state->base;
> >   		plane->state->plane = plane;
> > +		plane->state->zpos = exynos_plane->config->zpos;
> >   	}
> >   }
> >   
> > @@ -155,7 +155,6 @@ exynos_drm_plane_duplicate_state(struct drm_plane *plane)
> >   		return NULL;
> >   
> >   	__drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
> > -	copy->zpos = exynos_state->zpos;
> >   	return &copy->base;
> >   }
> >   
> > @@ -168,43 +167,6 @@ static void exynos_drm_plane_destroy_state(struct drm_plane *plane,
> >   	kfree(old_exynos_state);
> >   }
> >   
> > -static int exynos_drm_plane_atomic_set_property(struct drm_plane *plane,
> > -						struct drm_plane_state *state,
> > -						struct drm_property *property,
> > -						uint64_t val)
> > -{
> > -	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
> > -	struct exynos_drm_plane_state *exynos_state =
> > -					to_exynos_plane_state(state);
> > -	struct exynos_drm_private *dev_priv = plane->dev->dev_private;
> > -	const struct exynos_drm_plane_config *config = exynos_plane->config;
> > -
> > -	if (property == dev_priv->plane_zpos_property &&
> > -	    (config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS))
> > -		exynos_state->zpos = val;
> > -	else
> > -		return -EINVAL;
> > -
> > -	return 0;
> > -}
> > -
> > -static int exynos_drm_plane_atomic_get_property(struct drm_plane *plane,
> > -					  const struct drm_plane_state *state,
> > -					  struct drm_property *property,
> > -					  uint64_t *val)
> > -{
> > -	const struct exynos_drm_plane_state *exynos_state =
> > -		container_of(state, const struct exynos_drm_plane_state, base);
> > -	struct exynos_drm_private *dev_priv = plane->dev->dev_private;
> > -
> > -	if (property == dev_priv->plane_zpos_property)
> > -		*val = exynos_state->zpos;
> > -	else
> > -		return -EINVAL;
> > -
> > -	return 0;
> > -}
> > -
> >   static struct drm_plane_funcs exynos_plane_funcs = {
> >   	.update_plane	= drm_atomic_helper_update_plane,
> >   	.disable_plane	= drm_atomic_helper_disable_plane,
> > @@ -213,8 +175,6 @@ static struct drm_plane_funcs exynos_plane_funcs = {
> >   	.reset		= exynos_drm_plane_reset,
> >   	.atomic_duplicate_state = exynos_drm_plane_duplicate_state,
> >   	.atomic_destroy_state = exynos_drm_plane_destroy_state,
> > -	.atomic_set_property = exynos_drm_plane_atomic_set_property,
> > -	.atomic_get_property = exynos_drm_plane_atomic_get_property,
> >   };
> >   
> >   static int
> > @@ -302,20 +262,21 @@ static const struct drm_plane_helper_funcs plane_helper_funcs = {
> >   };
> >   
> >   static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
> > -					      unsigned int zpos)
> > +					      unsigned int zpos, bool immutable)
> >   {
> >   	struct drm_device *dev = plane->dev;
> > -	struct exynos_drm_private *dev_priv = dev->dev_private;
> >   	struct drm_property *prop;
> >   
> > -	prop = dev_priv->plane_zpos_property;
> > -	if (!prop) {
> > -		prop = drm_property_create_range(dev, 0, "zpos",
> > -						 0, MAX_PLANE - 1);
> > -		if (!prop)
> > -			return;
> > -
> > -		dev_priv->plane_zpos_property = prop;
> > +	if (immutable) {
> > +		if (!dev->mode_config.zpos_immutable_property)
> > +			if (!drm_mode_create_zpos_immutable_property(dev))
> > +				return;
> > +		prop = dev->mode_config.zpos_immutable_property;
> > +	} else {
> > +		if (!dev->mode_config.zpos_property)
> > +			if (!drm_mode_create_zpos_property(dev))
> > +				return;
> > +		prop = dev->mode_config.zpos_property;
> >   	}
> >   
> >   	drm_object_attach_property(&plane->base, prop, zpos);
> > @@ -344,7 +305,8 @@ int exynos_plane_init(struct drm_device *dev,
> >   	exynos_plane->index = index;
> >   	exynos_plane->config = config;
> >   
> > -	exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos);
> > +	exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos,
> > +			   !(config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS));
> >   
> >   	return 0;
> >   }
> > diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
> > index b5fbc1cbf024..6ab68eca0004 100644
> > --- a/drivers/gpu/drm/exynos/exynos_mixer.c
> > +++ b/drivers/gpu/drm/exynos/exynos_mixer.c
> > @@ -34,6 +34,7 @@
> >   #include <linux/component.h>
> >   
> >   #include <drm/exynos_drm.h>
> > +#include <drm/drm_atomic_helper.h>
> >   
> >   #include "exynos_drm_drv.h"
> >   #include "exynos_drm_crtc.h"
> > @@ -95,6 +96,8 @@ struct mixer_context {
> >   	struct drm_device	*drm_dev;
> >   	struct exynos_drm_crtc	*crtc;
> >   	struct exynos_drm_plane	planes[MIXER_WIN_NR];
> > +	struct drm_plane	*zpos_planes[MIXER_WIN_NR];
> > +	int			num_planes;
> >   	int			pipe;
> >   	unsigned long		flags;
> >   	bool			interlace;
> > @@ -478,6 +481,7 @@ static void vp_video_buffer(struct mixer_context *ctx,
> >   	struct drm_display_mode *mode = &state->base.crtc->state->adjusted_mode;
> >   	struct mixer_resources *res = &ctx->mixer_res;
> >   	struct drm_framebuffer *fb = state->base.fb;
> > +	unsigned int priority = state->base.normalized_zpos + 1;
> >   	unsigned long flags;
> >   	dma_addr_t luma_addr[2], chroma_addr[2];
> >   	bool tiled_mode = false;
> > @@ -562,7 +566,7 @@ static void vp_video_buffer(struct mixer_context *ctx,
> >   
> >   	mixer_cfg_scan(ctx, mode->vdisplay);
> >   	mixer_cfg_rgb_fmt(ctx, mode->vdisplay);
> > -	mixer_cfg_layer(ctx, plane->index, state->zpos + 1, true);
> > +	mixer_cfg_layer(ctx, plane->index, priority, true);
> >   	mixer_cfg_vp_blend(ctx);
> >   	mixer_run(ctx);
> >   
> > @@ -587,6 +591,7 @@ static void mixer_graph_buffer(struct mixer_context *ctx,
> >   	struct drm_display_mode *mode = &state->base.crtc->state->adjusted_mode;
> >   	struct mixer_resources *res = &ctx->mixer_res;
> >   	struct drm_framebuffer *fb = state->base.fb;
> > +	unsigned int priority = state->base.normalized_zpos + 1;
> >   	unsigned long flags;
> >   	unsigned int win = plane->index;
> >   	unsigned int x_ratio = 0, y_ratio = 0;
> > @@ -678,7 +683,7 @@ static void mixer_graph_buffer(struct mixer_context *ctx,
> >   
> >   	mixer_cfg_scan(ctx, mode->vdisplay);
> >   	mixer_cfg_rgb_fmt(ctx, mode->vdisplay);
> > -	mixer_cfg_layer(ctx, win, state->zpos + 1, true);
> > +	mixer_cfg_layer(ctx, win, priority, true);
> >   	mixer_cfg_gfx_blend(ctx, win, is_alpha_format(fb->pixel_format));
> >   
> >   	/* layer update mandatory for mixer 16.0.33.0 */
> > @@ -981,6 +986,12 @@ static void mixer_atomic_begin(struct exynos_drm_crtc *crtc)
> >   	if (!test_bit(MXR_BIT_POWERED, &mixer_ctx->flags))
> >   		return;
> >   
> > +	/*
> > +	 * Normalizing up to 3 planes is cheap, no need for checking
> > +	 * if zpos has been really changed.
> > +	 */
> > +	drm_atomic_helper_normalize_zpos(mixer_ctx->zpos_planes,
> > +					 mixer_ctx->num_planes);
> Hm, this is a bit a cumbersome interface for drivers and will make
> converting over to the normalized zpos more work. Can't we handle this in
> the atomic helpers directly? I'm thinking of the following flow:
>
> - if new_plane_state->zpos != old_plane_state->zpos then set new_crtc_state->zpos_changed
> - if new_crtc_state->plane_mask != old_crtc_state->plane_mask ||
>    new_crtc_state->zpos_changed then recompute normilized zpos.
>
> Imo that would fit well in drm_atomic_helper_check_planes().
>
> With that bit of additional logic drivers can just use normlized_zpos and
> don't need to care about anything really.

Okay, I will try to implement this logic.


Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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