linux-kernel - Re: [PATCH v7 2/5] drm/imx: Add initial support for DCSS on iMX8MQ

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Date:   Tue, 21 Jul 2020 14:43:28 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Laurentiu Palcu <laurentiu.palcu@....nxp.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Lucas Stach <l.stach@...gutronix.de>
Cc:     lukas@...mn.com, agx@...xcpu.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v7 2/5] drm/imx: Add initial support for DCSS on iMX8MQ

Hi Laurentiu,

On Tue, 2020-07-21 at 13:20 +0300, Laurentiu Palcu wrote:
> From: Laurentiu Palcu <laurentiu.palcu@....com>
> 
> This adds initial support for iMX8MQ's Display Controller Subsystem (DCSS).
> Some of its capabilities include:
>  * 4K@...ps;
>  * HDR10;
>  * one graphics and 2 video pipelines;
>  * on-the-fly decompression of compressed video and graphics;
> 
> The reference manual can be found here:
> https://www.nxp.com/webapp/Download?colCode=IMX8MDQLQRM
> 
> The current patch adds only basic functionality: one primary plane for
> graphics, linear, tiled and super-tiled buffers support (no graphics
> decompression yet), no HDR10 and no video planes.
> 
> Video planes support and HDR10 will be added in subsequent patches once
> per-plane de-gamma/CSC/gamma support is in.
> 
> Signed-off-by: Laurentiu Palcu <laurentiu.palcu@....com>
> Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
> ---
>  drivers/gpu/drm/imx/Kconfig            |   2 +
>  drivers/gpu/drm/imx/Makefile           |   1 +
>  drivers/gpu/drm/imx/dcss/Kconfig       |   9 +
>  drivers/gpu/drm/imx/dcss/Makefile      |   6 +
>  drivers/gpu/drm/imx/dcss/dcss-blkctl.c |  70 +++
>  drivers/gpu/drm/imx/dcss/dcss-crtc.c   | 219 +++++++
>  drivers/gpu/drm/imx/dcss/dcss-ctxld.c  | 424 +++++++++++++
>  drivers/gpu/drm/imx/dcss/dcss-dev.c    | 314 ++++++++++
>  drivers/gpu/drm/imx/dcss/dcss-dev.h    | 177 ++++++
>  drivers/gpu/drm/imx/dcss/dcss-dpr.c    | 562 +++++++++++++++++
>  drivers/gpu/drm/imx/dcss/dcss-drv.c    | 138 +++++
>  drivers/gpu/drm/imx/dcss/dcss-dtg.c    | 409 ++++++++++++
>  drivers/gpu/drm/imx/dcss/dcss-kms.c    | 177 ++++++
>  drivers/gpu/drm/imx/dcss/dcss-kms.h    |  43 ++
>  drivers/gpu/drm/imx/dcss/dcss-plane.c  | 405 ++++++++++++
>  drivers/gpu/drm/imx/dcss/dcss-scaler.c | 826 +++++++++++++++++++++++++
>  drivers/gpu/drm/imx/dcss/dcss-ss.c     | 180 ++++++
>  17 files changed, 3962 insertions(+)
>  create mode 100644 drivers/gpu/drm/imx/dcss/Kconfig
>  create mode 100644 drivers/gpu/drm/imx/dcss/Makefile
>  create mode 100644 drivers/gpu/drm/imx/dcss/dcss-blkctl.c
>  create mode 100644 drivers/gpu/drm/imx/dcss/dcss-crtc.c
>  create mode 100644 drivers/gpu/drm/imx/dcss/dcss-ctxld.c
>  create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dev.c
>  create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dev.h
>  create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dpr.c
>  create mode 100644 drivers/gpu/drm/imx/dcss/dcss-drv.c
>  create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dtg.c
>  create mode 100644 drivers/gpu/drm/imx/dcss/dcss-kms.c
>  create mode 100644 drivers/gpu/drm/imx/dcss/dcss-kms.h
>  create mode 100644 drivers/gpu/drm/imx/dcss/dcss-plane.c
>  create mode 100644 drivers/gpu/drm/imx/dcss/dcss-scaler.c
>  create mode 100644 drivers/gpu/drm/imx/dcss/dcss-ss.c
> 
> diff --git a/drivers/gpu/drm/imx/Kconfig b/drivers/gpu/drm/imx/Kconfig
> index 207bf7409dfb..6231048aa5aa 100644
> --- a/drivers/gpu/drm/imx/Kconfig
> +++ b/drivers/gpu/drm/imx/Kconfig
> @@ -39,3 +39,5 @@ config DRM_IMX_HDMI
>  	depends on DRM_IMX
>  	help
>  	  Choose this if you want to use HDMI on i.MX6.
> +
> +source "drivers/gpu/drm/imx/dcss/Kconfig"
> diff --git a/drivers/gpu/drm/imx/Makefile b/drivers/gpu/drm/imx/Makefile
> index 21cdcc2faabc..b644deffe948 100644
> --- a/drivers/gpu/drm/imx/Makefile
> +++ b/drivers/gpu/drm/imx/Makefile
> @@ -9,3 +9,4 @@ obj-$(CONFIG_DRM_IMX_TVE) += imx-tve.o
>  obj-$(CONFIG_DRM_IMX_LDB) += imx-ldb.o
>  
>  obj-$(CONFIG_DRM_IMX_HDMI) += dw_hdmi-imx.o
> +obj-$(CONFIG_DRM_IMX_DCSS) += dcss/
> diff --git a/drivers/gpu/drm/imx/dcss/Kconfig b/drivers/gpu/drm/imx/dcss/Kconfig
> new file mode 100644
> index 000000000000..988979bc22cc
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/Kconfig
> @@ -0,0 +1,9 @@
> +config DRM_IMX_DCSS
> +	tristate "i.MX8MQ DCSS"
> +	select RESET_CONTROLLER

Why does DCSS select RESET_CONTROLLER?

regards
Philipp