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Date:   Wed, 14 Aug 2019 08:10:34 +0000
From:   "james qian wang (Arm Technology China)" <james.qian.wang@....com>
To:     Mihail Atanassov <Mihail.Atanassov@....com>
CC:     Liviu Dudau <Liviu.Dudau@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        Brian Starkey <Brian.Starkey@....com>,
        "maarten.lankhorst@...ux.intel.com" 
        <maarten.lankhorst@...ux.intel.com>,
        "sean@...rly.run" <sean@...rly.run>,
        "Jonathan Chai (Arm Technology China)" <Jonathan.Chai@....com>,
        "Julien Yin (Arm Technology China)" <Julien.Yin@....com>,
        "Thomas Sun (Arm Technology China)" <thomas.Sun@....com>,
        "Lowry Li (Arm Technology China)" <Lowry.Li@....com>,
        Ayan Halder <Ayan.Halder@....com>,
        "Tiannan Zhu (Arm Technology China)" <Tiannan.Zhu@....com>,
        "Yiqi Kang (Arm Technology China)" <Yiqi.Kang@....com>,
        nd <nd@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Ben Davis <Ben.Davis@....com>,
        "Oscar Zhang (Arm Technology China)" <Oscar.Zhang@....com>,
        "Channing Chen (Arm Technology China)" <Channing.Chen@....com>
Subject: Re: [PATCH v2 4/4] drm/komeda: Enable Layer color management for
 komeda

On Tue, Aug 13, 2019 at 10:07:36AM +0000, Mihail Atanassov wrote:
> Hi James,
> 
> On Tuesday, 13 August 2019 05:56:19 BST james qian wang (Arm Technology China) wrote:
> > - D71 has 3 global layer gamma table which can be used for all layers as
> >   gamma lookup table, no matter inverse or forward.
> > - Add komeda_color_manager/state to layer/layer_state for describe the
> >   color caps for the specific layer which will be initialized in
> >   d71_layer_init, and for D71 only layer with L_INFO_CM (color mgmt) bit
> >   can support forward gamma, and CSC.
> > - Update komeda-CORE code to validate and convert the plane color state to
> >   komeda_color_state.
> > - Enable plane color mgmt according to layer komeda_color_manager
> > 
> > This patch depends on:
> > - https://patchwork.freedesktop.org/series/30876/
> > 
> > Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@....com>
> > ---
> >  .../arm/display/komeda/d71/d71_component.c    | 64 +++++++++++++++++++
> >  .../gpu/drm/arm/display/komeda/d71/d71_dev.c  |  5 +-
> >  .../gpu/drm/arm/display/komeda/d71/d71_dev.h  |  2 +
> >  .../drm/arm/display/komeda/komeda_pipeline.h  |  4 +-
> >  .../display/komeda/komeda_pipeline_state.c    | 53 ++++++++++++++-
> >  .../gpu/drm/arm/display/komeda/komeda_plane.c | 12 ++++
> >  .../arm/display/komeda/komeda_private_obj.c   |  4 ++
> >  7 files changed, 139 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c b/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
> > index 55a8cc94808a..c9c40a36e4d2 100644
> > --- a/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
> > +++ b/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
> > @@ -189,6 +189,46 @@ static void d71_layer_update_fb(struct komeda_component *c,
> >  	malidp_write32(reg, LAYER_FMT, kfb->format_caps->hw_id);
> >  }
> >  
> > +static u32 d71_layer_update_color(struct drm_plane_state *st,
> > +				  u32 __iomem *reg,
> > +				  struct komeda_color_state *color_st,
> > +				  u32 *mask)
> > +{
> > +	struct komeda_coeffs_table *igamma = color_st->igamma;
> > +	struct komeda_coeffs_table *fgamma = color_st->fgamma;
> > +	u32 ctrl = 0, v = 0;
> > +
> > +	if (!st->color_mgmt_changed)
> > +		return 0;
> > +
> > +	*mask |= L_IT | L_R2R | L_FT;
> > +
> > +	if (igamma) {
> > +		komeda_coeffs_update(igamma);
> > +		ctrl |= L_IT;
> > +		v = L_ITSEL(igamma->hw_id);
> > +	}
> > +
> > +	if (st->ctm) {
> > +		u32 ctm_coeffs[KOMEDA_N_CTM_COEFFS];
> > +
> > +		drm_ctm_to_coeffs(st->ctm, ctm_coeffs);
> > +		malidp_write_group(reg, LAYER_RGB_RGB_COEFF0,
> > +				   ARRAY_SIZE(ctm_coeffs),
> > +				   ctm_coeffs);
> > +		ctrl |= L_R2R; /* enable RGB2RGB conversion */
> > +	}
> > +
> > +	if (fgamma) {
> > +		komeda_coeffs_update(fgamma);
> > +		ctrl |= L_FT;
> > +		v |= L_FTSEL(fgamma->hw_id);
> > +	}
> > +
> > +	malidp_write32(reg, LAYER_LT_COEFFTAB, v);
> > +	return ctrl;
> > +}
> > +
> >  static void d71_layer_disable(struct komeda_component *c)
> >  {
> >  	malidp_write32_mask(c->reg, BLK_CONTROL, L_EN, 0);
> > @@ -261,6 +301,8 @@ static void d71_layer_update(struct komeda_component *c,
> >  
> >  	malidp_write32(reg, BLK_IN_SIZE, HV_SIZE(st->hsize, st->vsize));
> >  
> > +	ctrl |= d71_layer_update_color(plane_st, reg, &st->color_st, &ctrl_mask);
> > +
> >  	if (kfb->is_va)
> >  		ctrl |= L_TBU_EN;
> >  	malidp_write32_mask(reg, BLK_CONTROL, ctrl_mask, ctrl);
> > @@ -365,6 +407,12 @@ static int d71_layer_init(struct d71_dev *d71,
> >  	else
> >  		layer->layer_type = KOMEDA_FMT_SIMPLE_LAYER;
> >  
> > +	layer->color_mgr.igamma_mgr = d71->glb_lt_mgr;
> > +	if (layer_info & L_INFO_CM) {
> > +		layer->color_mgr.has_ctm = true;
> > +		layer->color_mgr.fgamma_mgr = d71->glb_lt_mgr;
> > +	}
> > +
> >  	set_range(&layer->hsize_in, 4, d71->max_line_size);
> >  	set_range(&layer->vsize_in, 4, d71->max_vsize);
> >  
> > @@ -1140,6 +1188,21 @@ static int d71_timing_ctrlr_init(struct d71_dev *d71,
> >  	return 0;
> >  }
> >  
> > +static void d71_gamma_update(struct komeda_coeffs_table *table)
> > +{
> > +	malidp_write_group(table->reg, GLB_LT_COEFF_DATA,
> > +			   GLB_LT_COEFF_NUM, table->coeffs);
> > +}
> > +
> > +static int d71_lt_coeff_init(struct d71_dev *d71,
> > +			     struct block_header *blk, u32 __iomem *reg)
> > +{
> > +	struct komeda_coeffs_manager *mgr = d71->glb_lt_mgr;
> > +	int hw_id = BLOCK_INFO_TYPE_ID(blk->block_info);
> > +
> > +	return komeda_coeffs_add(mgr, hw_id, reg, d71_gamma_update);
> > +}
> > +
> >  int d71_probe_block(struct d71_dev *d71,
> >  		    struct block_header *blk, u32 __iomem *reg)
> >  {
> > @@ -1202,6 +1265,7 @@ int d71_probe_block(struct d71_dev *d71,
> >  		break;
> >  
> >  	case D71_BLK_TYPE_GLB_LT_COEFF:
> > +		err = d71_lt_coeff_init(d71, blk, reg);
> >  		break;
> >  
> >  	case D71_BLK_TYPE_GLB_SCL_COEFF:
> > diff --git a/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c b/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c
> > index d567ab7ed314..edd5d7c7f2a2 100644
> > --- a/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c
> > +++ b/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c
> > @@ -341,7 +341,7 @@ static int d71_enum_resources(struct komeda_dev *mdev)
> >  	struct komeda_pipeline *pipe;
> >  	struct block_header blk;
> >  	u32 __iomem *blk_base;
> > -	u32 i, value, offset;
> > +	u32 i, value, offset, coeffs_size;
> >  	int err;
> >  
> >  	d71 = devm_kzalloc(mdev->dev, sizeof(*d71), GFP_KERNEL);
> > @@ -398,6 +398,9 @@ static int d71_enum_resources(struct komeda_dev *mdev)
> >  		d71->pipes[i] = to_d71_pipeline(pipe);
> >  	}
> >  
> > +	coeffs_size = GLB_LT_COEFF_NUM * sizeof(u32);
> > +	d71->glb_lt_mgr = komeda_coeffs_create_manager(coeffs_size);
> > +
> >  	/* loop the register blks and probe */
> >  	i = 2; /* exclude GCU and PERIPH */
> >  	offset = D71_BLOCK_SIZE; /* skip GCU */
> > diff --git a/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.h b/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.h
> > index 84f1878b647d..009c164a1584 100644
> > --- a/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.h
> > +++ b/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.h
> > @@ -39,6 +39,8 @@ struct d71_dev {
> >  	u32 __iomem	*periph_addr;
> >  
> >  	struct d71_pipeline *pipes[D71_MAX_PIPELINE];
> > +	 /* global layer transform coefficient table manager */
> > +	struct komeda_coeffs_manager *glb_lt_mgr;
> >  };
> >  
> >  #define to_d71_pipeline(x)	container_of(x, struct d71_pipeline, base)
> > diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
> > index a7a84e66549d..4104c81e5032 100644
> > --- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
> > +++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
> > @@ -10,6 +10,7 @@
> >  #include <linux/types.h>
> >  #include <drm/drm_atomic.h>
> >  #include <drm/drm_atomic_helper.h>
> > +#include "komeda_color_mgmt.h"
> >  #include "malidp_utils.h"
> >  
> >  #define KOMEDA_MAX_PIPELINES		2
> > @@ -226,6 +227,7 @@ struct komeda_layer {
> >  	struct komeda_component base;
> >  	/* accepted h/v input range before rotation */
> >  	struct malidp_range hsize_in, vsize_in;
> > +	struct komeda_color_manager color_mgr;
> >  	u32 layer_type; /* RICH, SIMPLE or WB */
> >  	u32 supported_rots;
> >  	/* komeda supports layer split which splits a whole image to two parts
> > @@ -238,7 +240,7 @@ struct komeda_layer {
> >  
> >  struct komeda_layer_state {
> >  	struct komeda_component_state base;
> > -	/* layer specific configuration state */
> > +	struct komeda_color_state color_st;
> >  	u16 hsize, vsize;
> >  	u32 rot;
> >  	u16 afbc_crop_l;
> > diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
> > index ea26bc9c2d00..803715c1128e 100644
> > --- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
> > +++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
> > @@ -95,6 +95,21 @@ komeda_pipeline_get_state_and_set_crtc(struct komeda_pipeline *pipe,
> >  	return st;
> >  }
> >  
> > +static bool komeda_component_is_new_active(struct komeda_component *c,
> > +					   struct drm_atomic_state *state)
> > +{
> > +	struct komeda_pipeline_state *ppl_old_st;
> > +
> > +	ppl_old_st = komeda_pipeline_get_old_state(c->pipeline, state);
> > +	if (IS_ERR(ppl_old_st))
> > +		return true;
> > +
> > +	if (has_bit(c->id, ppl_old_st->active_comps))
> > +		return false;
> > +
> > +	return true;
> > +}
> > +
> >  static struct komeda_component_state *
> >  komeda_component_get_state(struct komeda_component *c,
> >  			   struct drm_atomic_state *state)
> > @@ -279,6 +294,29 @@ komeda_rotate_data_flow(struct komeda_data_flow_cfg *dflow, u32 rot)
> >  	}
> >  }
> >  
> > +static int
> > +komeda_validate_plane_color(struct komeda_component *c,
> > +			    struct komeda_color_manager *color_mgr,
> > +			    struct komeda_color_state *color_st,
> > +			    struct drm_plane_state *plane_st)
> > +{
> > +	int err;
> > +
> > +	if (komeda_component_is_new_active(c, plane_st->state))
> > +		plane_st->color_mgmt_changed = true;
> > +
> > +	if (!plane_st->color_mgmt_changed)
> > +		return 0;
> > +
> > +	err = komeda_color_validate(color_mgr, color_st,
> > +				    plane_st->degamma_lut,
> > +				    plane_st->gamma_lut);
> > +	if (err)
> > +		DRM_DEBUG_ATOMIC("%s validate color failed.\n", c->name);
> > +
> > +	return err;
> > +}
> > +
> >  static int
> >  komeda_layer_check_cfg(struct komeda_layer *layer,
> >  		       struct komeda_fb *kfb,
> > @@ -362,6 +400,11 @@ komeda_layer_validate(struct komeda_layer *layer,
> >  		st->addr[i] = komeda_fb_get_pixel_addr(kfb, dflow->in_x,
> >  						       dflow->in_y, i);
> >  
> > +	err = komeda_validate_plane_color(&layer->base, &layer->color_mgr,
> > +					  &st->color_st, plane_st);
> > +	if (err)
> > +		return err;
> > +
> >  	err = komeda_component_validate_private(&layer->base, c_st);
> >  	if (err)
> >  		return err;
> > @@ -1177,7 +1220,7 @@ komeda_pipeline_unbound_components(struct komeda_pipeline *pipe,
> >  {
> >  	struct drm_atomic_state *drm_st = new->obj.state;
> >  	struct komeda_pipeline_state *old = priv_to_pipe_st(pipe->obj.state);
> > -	struct komeda_component_state *c_st;
> > +	struct komeda_component_state *st;
> >  	struct komeda_component *c;
> >  	u32 disabling_comps, id;
> >  
> > @@ -1188,9 +1231,13 @@ komeda_pipeline_unbound_components(struct komeda_pipeline *pipe,
> >  	/* unbound all disabling component */
> >  	dp_for_each_set_bit(id, disabling_comps) {
> >  		c = komeda_pipeline_get_component(pipe, id);
> > -		c_st = komeda_component_get_state_and_set_user(c,
> > +		st = komeda_component_get_state_and_set_user(c,
> >  				drm_st, NULL, new->crtc);
> > -		WARN_ON(IS_ERR(c_st));
> > +
> > +		WARN_ON(IS_ERR(st));
> I think this needs to be:
> if (WARN_ON(IS_ERR(st)))
>         continue;
> ...because...
> > +
> > +		if (has_bit(id, KOMEDA_PIPELINE_LAYERS))
> > +			komeda_color_cleanup_state(&to_layer_st(st)->color_st);
> ... this may deref an invalid `st' otherwise.

Because I don't real think unbound will return a error, so just a lazy
WARN_ON for the error handling. :)

But you are right. here we check the error we need to handle it
correctly. will refine the logic as you suggested.

thanks
james

> >  	}
> >  }
> >  
> > diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> > index 98e915e325dd..69fa1dea41c9 100644
> > --- a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> > +++ b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> > @@ -11,6 +11,7 @@
> >  #include "komeda_dev.h"
> >  #include "komeda_kms.h"
> >  #include "komeda_framebuffer.h"
> > +#include "komeda_color_mgmt.h"
> >  
> >  static int
> >  komeda_plane_init_data_flow(struct drm_plane_state *st,
> > @@ -250,6 +251,7 @@ static int komeda_plane_add(struct komeda_kms_dev *kms,
> >  {
> >  	struct komeda_dev *mdev = kms->base.dev_private;
> >  	struct komeda_component *c = &layer->base;
> > +	struct komeda_color_manager *color_mgr;
> >  	struct komeda_plane *kplane;
> >  	struct drm_plane *plane;
> >  	u32 *formats, n_formats = 0;
> > @@ -306,6 +308,16 @@ static int komeda_plane_add(struct komeda_kms_dev *kms,
> >  	if (err)
> >  		goto cleanup;
> >  
> > +	err = drm_plane_color_create_prop(plane->dev, plane);
> > +	if (err)
> > +		goto cleanup;
> > +
> > +	color_mgr = &layer->color_mgr;
> > +	drm_plane_enable_color_mgmt(plane,
> > +			color_mgr->igamma_mgr ? KOMEDA_COLOR_LUT_SIZE : 0,
> > +			color_mgr->has_ctm,
> > +			color_mgr->fgamma_mgr ? KOMEDA_COLOR_LUT_SIZE : 0);
> > +
> >  	err = drm_plane_create_zpos_property(plane, layer->base.id, 0, 8);
> >  	if (err)
> >  		goto cleanup;
> > diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c b/drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c
> > index 914400c4af73..4c474663f554 100644
> > --- a/drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c
> > +++ b/drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c
> > @@ -19,12 +19,15 @@ komeda_component_state_reset(struct komeda_component_state *st)
> >  static struct drm_private_state *
> >  komeda_layer_atomic_duplicate_state(struct drm_private_obj *obj)
> >  {
> > +	struct komeda_layer_state *old = to_layer_st(priv_to_comp_st(obj->state));
> >  	struct komeda_layer_state *st;
> >  
> >  	st = kmemdup(obj->state, sizeof(*st), GFP_KERNEL);
> >  	if (!st)
> >  		return NULL;
> >  
> > +	komeda_color_duplicate_state(&st->color_st, &old->color_st);
> > +
> >  	komeda_component_state_reset(&st->base);
> >  	__drm_atomic_helper_private_obj_duplicate_state(obj, &st->base.obj);
> >  
> > @@ -37,6 +40,7 @@ komeda_layer_atomic_destroy_state(struct drm_private_obj *obj,
> >  {
> >  	struct komeda_layer_state *st = to_layer_st(priv_to_comp_st(state));
> >  
> > +	komeda_color_cleanup_state(&st->color_st);
> >  	kfree(st);
> >  }
> >  
> > 
> 
> BR,
> Mihail
> 
> 

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