linux-kernel - Re: [PATCH 09/14] drm/imx: dc-ed: Support getting source selection

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Message-ID: <aM113cxd3sLwEyD1@lizhi-Precision-Tower-5810>
Date: Fri, 19 Sep 2025 11:25:17 -0400
From: Frank Li <Frank.li@....com>
To: Liu Ying <victor.liu@....com>
Cc: Philipp Zabel <p.zabel@...gutronix.de>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Dmitry Baryshkov <lumag@...nel.org>,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/14] drm/imx: dc-ed: Support getting source selection

On Fri, Jul 04, 2025 at 05:03:56PM +0800, Liu Ying wrote:
> Add a helper to get ExtDst source selection.  This is needed by
> disabling CRTC at boot in an upcoming commit which tries to get
> the source selection.
>
> Signed-off-by: Liu Ying <victor.liu@....com>

Reviewed-by: Frank Li <Frank.Li@....com>

> ---
>  drivers/gpu/drm/imx/dc/dc-ed.c | 26 ++++++++++++++++++++++++++
>  drivers/gpu/drm/imx/dc/dc-pe.h |  1 +
>  2 files changed, 27 insertions(+)
>
> diff --git a/drivers/gpu/drm/imx/dc/dc-ed.c b/drivers/gpu/drm/imx/dc/dc-ed.c
> index 86ecc22d0a554bf3eced218df0312b513e10e179..b514790bb765329295553f89d16ee1167ef411dd 100644
> --- a/drivers/gpu/drm/imx/dc/dc-ed.c
> +++ b/drivers/gpu/drm/imx/dc/dc-ed.c
> @@ -150,6 +150,32 @@ void dc_ed_pec_src_sel(struct dc_ed *ed, enum dc_link_id src)
>  	}
>  }
>
> +int dc_ed_pec_src_sel_get(struct dc_ed *ed, enum dc_link_id *src)
> +{
> +	u32 val;
> +
> +	regmap_read(ed->reg_pec, PIXENGCFG_DYNAMIC, &val);
> +
> +	switch (val) {
> +	case LINK_ID_NONE:
> +	case LINK_ID_CONSTFRAME0:
> +	case LINK_ID_CONSTFRAME4:
> +	case LINK_ID_CONSTFRAME1:
> +	case LINK_ID_CONSTFRAME5:
> +	case LINK_ID_FETCHWARP2:
> +	case LINK_ID_FETCHLAYER0:
> +	case LINK_ID_LAYERBLEND0:
> +	case LINK_ID_LAYERBLEND1:
> +	case LINK_ID_LAYERBLEND2:
> +	case LINK_ID_LAYERBLEND3:
> +		*src = val;
> +		dev_dbg(ed->dev, "get source selection: 0x%02x\n", val);
> +		return 0;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
>  void dc_ed_pec_sync_trigger(struct dc_ed *ed)
>  {
>  	regmap_write(ed->reg_pec, PIXENGCFG_TRIGGER, SYNC_TRIGGER);
> diff --git a/drivers/gpu/drm/imx/dc/dc-pe.h b/drivers/gpu/drm/imx/dc/dc-pe.h
> index f5e01a6eb9e918516adfc89949665fdd2ff1e40e..0b81dc6b251c452e7ca72f1cd12af065bafaa198 100644
> --- a/drivers/gpu/drm/imx/dc/dc-pe.h
> +++ b/drivers/gpu/drm/imx/dc/dc-pe.h
> @@ -85,6 +85,7 @@ void dc_cf_init(struct dc_cf *cf);
>
>  /* External Destination Unit */
>  void dc_ed_pec_src_sel(struct dc_ed *ed, enum dc_link_id src);
> +int dc_ed_pec_src_sel_get(struct dc_ed *ed, enum dc_link_id *src);
>  void dc_ed_pec_sync_trigger(struct dc_ed *ed);
>  void dc_ed_init(struct dc_ed *ed);
>
>
> --
> 2.34.1
>