linux-kernel - Re: [PATCH 2/2] drm/tidss: Add support for AM62L display subsystem

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Message-ID: <4a85d26f-19de-4846-998f-c35547e9a7f2@ideasonboard.com>
Date: Mon, 6 Jan 2025 11:28:45 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Devarsh Thakkar <devarsht@...com>
Cc: praneeth@...com, vigneshr@...com, aradhya.bhatia@...ux.dev,
 s-jain1@...com, r-donadkar@...com, j-choudhary@...com, h-shenoy@...com,
 jyri.sarha@....fi, airlied@...il.com, maarten.lankhorst@...ux.intel.com,
 mripard@...nel.org, tzimmermann@...e.de, dri-devel@...ts.freedesktop.org,
 simona@...ll.ch, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org
Subject: Re: [PATCH 2/2] drm/tidss: Add support for AM62L display subsystem

Hi,

On 31/12/2024 11:04, Devarsh Thakkar wrote:
> Enable display for AM62L DSS [1] which supports only a single display
> pipeline using a single overlay manager, single video port and a single
> video lite pipeline which does not support scaling.
> 
> The output of video port is routed to SoC boundary via DPI interface and
> the DPI signals from the video port are also routed to DSI Tx controller
> present within the SoC.
> 
> [1]: Section 11.7 (Display Subsystem and Peripherals)
> Link : https://www.ti.com/lit/pdf/sprujb4
> 
> Signed-off-by: Devarsh Thakkar <devarsht@...com>
> ---
>   drivers/gpu/drm/tidss/tidss_dispc.c | 34 +++++++++++++++++++++++++++++
>   drivers/gpu/drm/tidss/tidss_dispc.h |  2 ++
>   drivers/gpu/drm/tidss/tidss_drv.c   |  1 +
>   3 files changed, 37 insertions(+)
> 
> diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c
> index cacb5f3d8085..cd322d60b825 100644
> --- a/drivers/gpu/drm/tidss/tidss_dispc.c
> +++ b/drivers/gpu/drm/tidss/tidss_dispc.c
> @@ -376,6 +376,35 @@ const struct dispc_features dispc_am62a7_feats = {
>   	.vid_order = { 1, 0 },
>   };
>   
> +const struct dispc_features dispc_am62l_feats = {
> +	.max_pclk_khz = {
> +		[DISPC_VP_DPI] = 165000,
> +	},
> +
> +	.subrev = DISPC_AM62L,
> +
> +	.common = "common",
> +	.common_regs = tidss_am65x_common_regs,
> +
> +	.num_vps = 1,
> +	.vp_name = { "vp1" },
> +	.ovr_name = { "ovr1" },
> +	.vpclk_name =  { "vp1" },
> +	.vp_bus_type = { DISPC_VP_DPI },
> +
> +	.vp_feat = { .color = {
> +			.has_ctm = true,
> +			.gamma_size = 256,
> +			.gamma_type = TIDSS_GAMMA_8BIT,
> +		},
> +	},
> +
> +	.num_planes = 1,
> +	.vid_name = { "vidl1" },
> +	.vid_lite = { true },
> +	.vid_order = { 0 },
> +};
> +
>   static const u16 *dispc_common_regmap;
>   
>   struct dss_vp_data {
> @@ -879,6 +908,7 @@ dispc_irq_t dispc_read_and_clear_irqstatus(struct dispc_device *dispc)
>   		return dispc_k2g_read_and_clear_irqstatus(dispc);
>   	case DISPC_AM625:
>   	case DISPC_AM62A7:
> +	case DISPC_AM62L:
>   	case DISPC_AM65X:
>   	case DISPC_J721E:

Not related to this patch, but these lists are getting a bit silly... We 
probably should handle them in a more centralized way. Maybe with the 
dispc_features.

  Tomi

>   		return dispc_k3_read_and_clear_irqstatus(dispc);
> @@ -896,6 +926,7 @@ void dispc_set_irqenable(struct dispc_device *dispc, dispc_irq_t mask)
>   		break;
>   	case DISPC_AM625:
>   	case DISPC_AM62A7:
> +	case DISPC_AM62L:
>   	case DISPC_AM65X:
>   	case DISPC_J721E:
>   		dispc_k3_set_irqenable(dispc, mask);
> @@ -1388,6 +1419,7 @@ void dispc_ovr_set_plane(struct dispc_device *dispc, u32 hw_plane,
>   		break;
>   	case DISPC_AM625:
>   	case DISPC_AM62A7:
> +	case DISPC_AM62L:
>   	case DISPC_AM65X:
>   		dispc_am65x_ovr_set_plane(dispc, hw_plane, hw_videoport,
>   					  x, y, layer);
> @@ -2308,6 +2340,7 @@ static void dispc_plane_init(struct dispc_device *dispc)
>   		break;
>   	case DISPC_AM625:
>   	case DISPC_AM62A7:
> +	case DISPC_AM62L:
>   	case DISPC_AM65X:
>   	case DISPC_J721E:
>   		dispc_k3_plane_init(dispc);
> @@ -2416,6 +2449,7 @@ static void dispc_vp_write_gamma_table(struct dispc_device *dispc,
>   		break;
>   	case DISPC_AM625:
>   	case DISPC_AM62A7:
> +	case DISPC_AM62L:
>   	case DISPC_AM65X:
>   		dispc_am65x_vp_write_gamma_table(dispc, hw_videoport);
>   		break;
> diff --git a/drivers/gpu/drm/tidss/tidss_dispc.h b/drivers/gpu/drm/tidss/tidss_dispc.h
> index 086327d51a90..275de8d02b75 100644
> --- a/drivers/gpu/drm/tidss/tidss_dispc.h
> +++ b/drivers/gpu/drm/tidss/tidss_dispc.h
> @@ -62,6 +62,7 @@ enum dispc_dss_subrevision {
>   	DISPC_K2G,
>   	DISPC_AM625,
>   	DISPC_AM62A7,
> +	DISPC_AM62L,
>   	DISPC_AM65X,
>   	DISPC_J721E,
>   };
> @@ -91,6 +92,7 @@ struct dispc_features {
>   extern const struct dispc_features dispc_k2g_feats;
>   extern const struct dispc_features dispc_am625_feats;
>   extern const struct dispc_features dispc_am62a7_feats;
> +extern const struct dispc_features dispc_am62l_feats;
>   extern const struct dispc_features dispc_am65x_feats;
>   extern const struct dispc_features dispc_j721e_feats;
>   
> diff --git a/drivers/gpu/drm/tidss/tidss_drv.c b/drivers/gpu/drm/tidss/tidss_drv.c
> index d4652e8cc28c..f2a4f659f574 100644
> --- a/drivers/gpu/drm/tidss/tidss_drv.c
> +++ b/drivers/gpu/drm/tidss/tidss_drv.c
> @@ -242,6 +242,7 @@ static const struct of_device_id tidss_of_table[] = {
>   	{ .compatible = "ti,k2g-dss", .data = &dispc_k2g_feats, },
>   	{ .compatible = "ti,am625-dss", .data = &dispc_am625_feats, },
>   	{ .compatible = "ti,am62a7-dss", .data = &dispc_am62a7_feats, },
> +	{ .compatible = "ti,am62l-dss", .data = &dispc_am62l_feats, },
>   	{ .compatible = "ti,am65x-dss", .data = &dispc_am65x_feats, },
>   	{ .compatible = "ti,j721e-dss", .data = &dispc_j721e_feats, },
>   	{ }