linux-kernel - Re: [PATCH v2 1/1] drm/lsdc: add drm driver for loongson display controller

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Message-ID: <687c2d76-ecfd-f3a4-f9b0-8c0178705cdf@infradead.org>
Date:   Sat, 29 Jan 2022 22:27:12 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Sui Jingfeng <15330273260@....cn>,
        Lucas Stach <l.stach@...gutronix.de>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Roland Scheidegger <sroland@...are.com>,
        Zack Rusin <zackr@...are.com>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>,
        Sam Ravnborg <sam@...nborg.org>,
        suijingfeng <suijingfeng@...ngson.cn>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 1/1] drm/lsdc: add drm driver for loongson display
 controller

Hi--

On 1/29/22 22:04, Sui Jingfeng wrote:
> diff --git a/drivers/gpu/drm/lsdc/Kconfig b/drivers/gpu/drm/lsdc/Kconfig
> new file mode 100644
> index 000000000000..f470892ddf60
> --- /dev/null
> +++ b/drivers/gpu/drm/lsdc/Kconfig
> @@ -0,0 +1,38 @@
> +config DRM_LSDC
> +	tristate "DRM Support for loongson's display controller"
> +	depends on DRM && PCI
> +	depends on MACH_LOONGSON64 || LOONGARCH || MIPS || COMPILE_TEST
> +	select OF
> +	select CMA if HAVE_DMA_CONTIGUOUS
> +	select DMA_CMA if HAVE_DMA_CONTIGUOUS
> +	select DRM_KMS_HELPER
> +	select DRM_KMS_FB_HELPER
> +	select DRM_GEM_CMA_HELPER
> +	select VIDEOMODE_HELPERS
> +	select BACKLIGHT_PWM if CPU_LOONGSON2K
> +	select I2C_GPIO if CPU_LOONGSON2K
> +	select I2C_LS2X if CPU_LOONGSON2K
> +	default m
> +	help
> +	  This is a KMS driver for the display controller in the LS7A1000
> +	  bridge chip and LS2K1000 SoC. The display controller have two

	                                                       has two

> +	  display pipes and it is a PCI device.
> +	  When using this driver on LS2K1000/LS2K0500 SoC, its framebuffer
> +	  is located at system memory.
> +	  If "M" is selected, the module will be called lsdc.
> +
> +	  If in doubt, say "Y".
> +
> +config DRM_LSDC_VRAM_DRIVER
> +	bool "vram helper based device driver support"
> +	depends on DRM_LSDC
> +	select DRM_VRAM_HELPER
> +	default y
> +	help
> +	  When using this driver on LS7A1000 + LS3A3000/LS3A4000/LS3A5000
> +	  platform, the LS7A1000 bridge chip have dedicated video RAM.

	                                     has

> +	  Pass lsdc.use_vram_helper = 1 to the kernel cmd line will enable

	  Using "lsdc.use_vram_helper=1" in the kernel command line will enable

(No spaces allowed in the kernel command line.)

> +	  this driver mode and then the framebuffer will located at the
> +	  VRAM at the price of losing PRIME support.

-- 
~Randy