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From:   Brian Starkey <Brian.Starkey@arm.com>
To:     "Lowry Li (Arm Technology China)" <Lowry.Li@arm.com>
CC:     Liviu Dudau <Liviu.Dudau@arm.com>,
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Subject: Re: [PATCH] drm/komeda: Adds output-color format/depth support
Thread-Topic: [PATCH] drm/komeda: Adds output-color format/depth support
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Date:   Mon, 23 Sep 2019 12:16:12 +0000
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Hi Lowry,

On Fri, Sep 20, 2019 at 09:43:47AM +0000, Lowry Li (Arm Technology China) w=
rote:
> From: "Lowry Li (Arm Technology China)" <Lowry.Li@arm.com>
>=20
> Sets color_depth according to connector->bpc.
> Adds a new optional DT attribute "color-format" to represent a
> preferred color formats for a specific pipeline, and the select order
> is:
> 	YCRCB420 > YCRCB422 > YCRCB444 > RGB444
> The color-format can be anyone of these 4 format, one color-format not
> only represent one format, but also include the lower formats, like
>=20
> color-format         preferred_color_formats
> YCRCB420        YCRCB420 > YCRCB422 > YCRCB444 > RGB444
> YCRCB422        YCRCB422 > YCRCB444 > RGB444
> YCRCB444        YCRCB444 > RGB444
> RGB444          RGB444
>=20
> Then the final color_format is calculated by 3 steps:
> 1. calculate HW available formats.
>   avail_formats =3D connector_color_formats & improc->color_formats;
> 2. filter out un-preferred format.
>   avail_formats &=3D preferred_color_formats;
> 3. select the final format according to the preferred order.
>   color_format =3D BIT(__fls(aval_formats));

Is there a specific use-case for the DT property for selecting color
format?

I think in general the color format should be determined according to
the rules in the CEA spec. There's also the drm_mode_is_420_only()
helper we can use to determine if YCBCR420 must be used. For the cases
where it's optional, I think we can default to RGB444.

Thanks,
-Brian

>=20
> Changes since v1:
> Rebased to the drm-misc-next branch.
>=20
> Signed-off-by: Lowry Li (Arm Technology China) <lowry.li@arm.com>
> ---
>  .../arm/display/komeda/d71/d71_component.c    | 15 ++++++++-
>  .../gpu/drm/arm/display/komeda/komeda_crtc.c  | 27 ++++++++++++++++
>  .../gpu/drm/arm/display/komeda/komeda_dev.c   | 32 ++++++++++++++++++-
>  .../gpu/drm/arm/display/komeda/komeda_kms.h   |  2 ++
>  .../drm/arm/display/komeda/komeda_pipeline.h  |  3 ++
>  .../display/komeda/komeda_pipeline_state.c    | 31 ++++++++++++++++++
>  .../arm/display/komeda/komeda_wb_connector.c  |  5 +++
>  7 files changed, 113 insertions(+), 2 deletions(-)
>=20
> diff --git a/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c b/dri=
vers/gpu/drm/arm/display/komeda/d71/d71_component.c
> index c3d29c0b051b..7b374a3b911e 100644
> --- a/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
> +++ b/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
> @@ -944,13 +944,26 @@ static void d71_improc_update(struct komeda_compone=
nt *c,
>  {
>  	struct komeda_improc_state *st =3D to_improc_st(state);
>  	u32 __iomem *reg =3D c->reg;
> -	u32 index;
> +	u32 index, mask =3D 0, ctrl =3D 0;
> =20
>  	for_each_changed_input(state, index)
>  		malidp_write32(reg, BLK_INPUT_ID0 + index * 4,
>  			       to_d71_input_id(state, index));
> =20
>  	malidp_write32(reg, BLK_SIZE, HV_SIZE(st->hsize, st->vsize));
> +	malidp_write32(reg, IPS_DEPTH, st->color_depth);
> +
> +	mask |=3D IPS_CTRL_YUV | IPS_CTRL_CHD422 | IPS_CTRL_CHD420;
> +
> +	/* config color format */
> +	if (st->color_format =3D=3D DRM_COLOR_FORMAT_YCRCB420)
> +		ctrl |=3D IPS_CTRL_YUV | IPS_CTRL_CHD422 | IPS_CTRL_CHD420;
> +	else if (st->color_format =3D=3D DRM_COLOR_FORMAT_YCRCB422)
> +		ctrl |=3D IPS_CTRL_YUV | IPS_CTRL_CHD422;
> +	else if (st->color_format =3D=3D DRM_COLOR_FORMAT_YCRCB444)
> +		ctrl |=3D IPS_CTRL_YUV;
> +
> +	malidp_write32_mask(reg, BLK_CONTROL, mask, ctrl);
>  }
> =20
>  static void d71_improc_dump(struct komeda_component *c, struct seq_file =
*sf)
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/g=
pu/drm/arm/display/komeda/komeda_crtc.c
> index 624d257da20f..38d5cb20e908 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> @@ -18,6 +18,33 @@
>  #include "komeda_dev.h"
>  #include "komeda_kms.h"
> =20
> +void komeda_crtc_get_color_config(struct drm_crtc_state *crtc_st,
> +				  u32 *color_depths, u32 *color_formats)
> +{
> +	struct drm_connector *conn;
> +	struct drm_connector_state *conn_st;
> +	u32 conn_color_formats =3D ~0u;
> +	int i, min_bpc =3D 31, conn_bpc =3D 0;
> +
> +	for_each_new_connector_in_state(crtc_st->state, conn, conn_st, i) {
> +		if (conn_st->crtc !=3D crtc_st->crtc)
> +			continue;
> +
> +		conn_bpc =3D conn->display_info.bpc ? conn->display_info.bpc : 8;
> +		conn_color_formats &=3D conn->display_info.color_formats;
> +
> +		if (conn_bpc < min_bpc)
> +			min_bpc =3D conn_bpc;
> +	}
> +
> +	/* connector doesn't config any color_format, use RGB444 as default */
> +	if (conn_color_formats =3D=3D 0)
> +		conn_color_formats =3D DRM_COLOR_FORMAT_RGB444;
> +
> +	*color_depths =3D GENMASK(conn_bpc, 0);
> +	*color_formats =3D conn_color_formats;
> +}
> +
>  static void komeda_crtc_update_clock_ratio(struct komeda_crtc_state *kcr=
tc_st)
>  {
>  	u64 pxlclk, aclk;
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c b/drivers/gp=
u/drm/arm/display/komeda/komeda_dev.c
> index 9cbcd56e54cd..bee4633cdd9f 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
> @@ -113,12 +113,34 @@ static struct attribute_group komeda_sysfs_attr_gro=
up =3D {
>  	.attrs =3D komeda_sysfs_entries,
>  };
> =20
> +static int to_color_format(const char *str)
> +{
> +	int format;
> +
> +	if (!strncmp(str, "RGB444", 7)) {
> +		format =3D DRM_COLOR_FORMAT_RGB444;
> +	} else if (!strncmp(str, "YCRCB444", 9)) {
> +		format =3D DRM_COLOR_FORMAT_YCRCB444;
> +	} else if (!strncmp(str, "YCRCB422", 9)) {
> +		format =3D DRM_COLOR_FORMAT_YCRCB422;
> +	} else if (!strncmp(str, "YCRCB420", 9)) {
> +		format =3D DRM_COLOR_FORMAT_YCRCB420;
> +	} else {
> +		DRM_WARN("invalid color_format: %s, please set it to RGB444, YCRCB444,=
 YCRCB422 or YCRCB420\n",
> +			 str);
> +		format =3D DRM_COLOR_FORMAT_RGB444;
> +	}
> +
> +	return format;
> +}
> +
>  static int komeda_parse_pipe_dt(struct komeda_dev *mdev, struct device_n=
ode *np)
>  {
>  	struct komeda_pipeline *pipe;
>  	struct clk *clk;
>  	u32 pipe_id;
> -	int ret =3D 0;
> +	int ret =3D 0, color_format;
> +	const char *str;
> =20
>  	ret =3D of_property_read_u32(np, "reg", &pipe_id);
>  	if (ret !=3D 0 || pipe_id >=3D mdev->n_pipelines)
> @@ -133,6 +155,14 @@ static int komeda_parse_pipe_dt(struct komeda_dev *m=
dev, struct device_node *np)
>  	}
>  	pipe->pxlclk =3D clk;
> =20
> +	/* fetch DT configured color-format, if not set, use RGB444 */
> +	if (!of_property_read_string(np, "color-format", &str))
> +		color_format =3D to_color_format(str);
> +	else
> +		color_format =3D DRM_COLOR_FORMAT_RGB444;
> +
> +	pipe->improc->preferred_color_formats =3D (color_format << 1) - 1;
> +
>  	/* enum ports */
>  	pipe->of_output_links[0] =3D
>  		of_graph_get_remote_node(np, KOMEDA_OF_PORT_OUTPUT, 0);
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h b/drivers/gp=
u/drm/arm/display/komeda/komeda_kms.h
> index 45c498e15e7a..456f3c435719 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
> @@ -166,6 +166,8 @@ static inline bool has_flip_h(u32 rot)
>  		return !!(rotation & DRM_MODE_REFLECT_X);
>  }
> =20
> +void komeda_crtc_get_color_config(struct drm_crtc_state *crtc_st,
> +				  u32 *color_depths, u32 *color_formats);
>  unsigned long komeda_crtc_get_aclk(struct komeda_crtc_state *kcrtc_st);
> =20
>  int komeda_kms_setup_crtcs(struct komeda_kms_dev *kms, struct komeda_dev=
 *mdev);
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h b/drive=
rs/gpu/drm/arm/display/komeda/komeda_pipeline.h
> index a7a84e66549d..910d279ae48d 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
> @@ -315,6 +315,8 @@ struct komeda_splitter_state {
>  struct komeda_improc {
>  	struct komeda_component base;
>  	u32 supported_color_formats;  /* DRM_RGB/YUV444/YUV420*/
> +	/* the preferred order is from MSB to LSB YUV420 --> RGB444 */
> +	u32 preferred_color_formats;
>  	u32 supported_color_depths; /* BIT(8) | BIT(10)*/
>  	u8 supports_degamma : 1;
>  	u8 supports_csc : 1;
> @@ -323,6 +325,7 @@ struct komeda_improc {
> =20
>  struct komeda_improc_state {
>  	struct komeda_component_state base;
> +	u8 color_format, color_depth;
>  	u16 hsize, vsize;
>  };
> =20
> 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..5526731f5a33 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
> @@ -743,6 +743,7 @@ komeda_improc_validate(struct komeda_improc *improc,
>  		       struct komeda_data_flow_cfg *dflow)
>  {
>  	struct drm_crtc *crtc =3D kcrtc_st->base.crtc;
> +	struct drm_crtc_state *crtc_st =3D &kcrtc_st->base;
>  	struct komeda_component_state *c_st;
>  	struct komeda_improc_state *st;
> =20
> @@ -756,6 +757,36 @@ komeda_improc_validate(struct komeda_improc *improc,
>  	st->hsize =3D dflow->in_w;
>  	st->vsize =3D dflow->in_h;
> =20
> +	if (drm_atomic_crtc_needs_modeset(crtc_st)) {
> +		u32 output_depths, output_formats;
> +		u32 avail_depths, avail_formats;
> +
> +		komeda_crtc_get_color_config(crtc_st, &output_depths,
> +					     &output_formats);
> +
> +		avail_depths =3D output_depths & improc->supported_color_depths;
> +		if (avail_depths =3D=3D 0) {
> +			DRM_DEBUG_ATOMIC("No available color depths, conn depths: 0x%x & disp=
lay: 0x%x\n",
> +					 output_depths,
> +					 improc->supported_color_depths);
> +			return -EINVAL;
> +		}
> +
> +		avail_formats =3D output_formats &
> +				improc->supported_color_formats &
> +				improc->preferred_color_formats;
> +		if (avail_formats =3D=3D 0) {
> +			DRM_DEBUG_ATOMIC("No available color_formats, conn formats 0x%x & dis=
play: 0x%x & preferred: 0x%x\n",
> +					 output_formats,
> +					 improc->supported_color_formats,
> +					 improc->preferred_color_formats);
> +			return -EINVAL;
> +		}
> +
> +		st->color_depth =3D __fls(avail_depths);
> +		st->color_format =3D BIT(__fls(avail_formats));
> +	}
> +
>  	komeda_component_add_input(&st->base, &dflow->input, 0);
>  	komeda_component_set_output(&dflow->input, &improc->base, 0);
> =20
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c b/d=
rivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
> index 617e1f7b8472..49e5469ba48e 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
> @@ -142,6 +142,7 @@ static int komeda_wb_connector_add(struct komeda_kms_=
dev *kms,
>  	struct komeda_dev *mdev =3D kms->base.dev_private;
>  	struct komeda_wb_connector *kwb_conn;
>  	struct drm_writeback_connector *wb_conn;
> +	struct drm_display_info *info;
>  	u32 *formats, n_formats =3D 0;
>  	int err;
> =20
> @@ -171,6 +172,10 @@ static int komeda_wb_connector_add(struct komeda_kms=
_dev *kms,
> =20
>  	drm_connector_helper_add(&wb_conn->base, &komeda_wb_conn_helper_funcs);
> =20
> +	info =3D &kwb_conn->base.base.display_info;
> +	info->bpc =3D __fls(kcrtc->master->improc->supported_color_depths);
> +	info->color_formats =3D kcrtc->master->improc->supported_color_formats;
> +
>  	kcrtc->wb_conn =3D kwb_conn;
> =20
>  	return 0;
> --=20
> 2.17.1
>=20