From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <dri-devel-bounces@lists.freedesktop.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by smtp.lore.kernel.org (Postfix) with ESMTPS id 7D04BEB64DC
	for <dri-devel@archiver.kernel.org>; Sun, 25 Jun 2023 09:26:24 +0000 (UTC)
Received: from gabe.freedesktop.org (localhost [127.0.0.1])
	by gabe.freedesktop.org (Postfix) with ESMTP id 7A6B910E152;
	Sun, 25 Jun 2023 09:26:21 +0000 (UTC)
Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163])
 by gabe.freedesktop.org (Postfix) with ESMTP id E8D8010E10A
 for <dri-devel@lists.freedesktop.org>; Sun, 25 Jun 2023 07:56:47 +0000 (UTC)
Received: from loongson.cn (unknown [10.20.42.72])
 by gateway (Coremail) with SMTP id _____8Bx2cU885dk0X8BAA--.2311S3;
 Sun, 25 Jun 2023 15:56:44 +0800 (CST)
Received: from [10.20.42.72] (unknown [10.20.42.72])
 by localhost.localdomain (Coremail) with SMTP id
 AQAAf8BxSM0485dkxpAGAA--.3850S2; 
 Sun, 25 Jun 2023 15:56:40 +0800 (CST)
Subject: Re: [PATCH v15 1/2] drm: Add kms driver for loongson display
 controller
To: Sui Jingfeng <15330273260@189.cn>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>,
 David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
 Sumit Semwal <sumit.semwal@linaro.org>,
 Sui Jingfeng <suijingfeng@loongson.cn>,
 Christian Koenig <christian.koenig@amd.com>
References: <20230615143613.1236245-1-15330273260@189.cn>
 <20230615143613.1236245-2-15330273260@189.cn>
From: liyi <liyi@loongson.cn>
Message-ID: <876700a9-a9e5-4f85-477a-88b8c85947c8@loongson.cn>
Date: Sun, 25 Jun 2023 15:56:40 +0800
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.3.0
MIME-Version: 1.0
In-Reply-To: <20230615143613.1236245-2-15330273260@189.cn>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
Content-Language: uk-UA
X-CM-TRANSID: AQAAf8BxSM0485dkxpAGAA--.3850S2
X-CM-SenderInfo: pol1xqxorr0wxvrqhubq/
X-Coremail-Antispam: 1Uk129KBj9DXoWkCw4UZw17KF1kury5ur17Arc_yoW8Zw18Jr
 c_uFy2vF4kGwn8AF1Fqw1UCw12qas3Gr97XFs8XFWIqFZ7AwnrXa48CrWrXr1xuFWUuw18
 tF9xJ34kGFy2y3Z2gosvyTuYvTs0mTUanT9S1TB71UUUUjJqnTZGkaVYY2UrUUUUj1kv1T
 uYvTs0mT0YCTnIWjqI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9f
 nUUIcSsGvfJTRUUUbqxYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4
 v20xvaj40_Wr0E3s1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0
 rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW8JVW5JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267
 AKxVW8JVWxJwA2z4x0Y4vEx4A2jsIE14v26r4UJVWxJr1l84ACjcxK6I8E87Iv6xkF7I0E
 14v26r4UJVWxJr1ln4kS14v26r126r1DM2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6x
 kI12xvs2x26I8E6xACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v2
 6r126r1DMcIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IY64
 vIr41lc7I2V7IY0VAS07AlzVAYIcxG8wCY1x0262kKe7AKxVWUAVWUtwCF04k20xvY0x0E
 wIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwCFI7km07C267AKxVWUAVWUtwC20s026c02F4
 0E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_GFv_Wryl
 IxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUCVW8JwCI42IY6xIIjxv20xvEc7CjxV
 AFwI0_Jr0_Gr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j
 6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Jr0_GrUvcSsGvfC2KfnxnUUI43ZEXa7IU8Dl1D
 UUUUU==
X-Mailman-Approved-At: Sun, 25 Jun 2023 09:26:15 +0000
X-BeenThere: dri-devel@lists.freedesktop.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Direct Rendering Infrastructure - Development
 <dri-devel.lists.freedesktop.org>
List-Unsubscribe: <https://lists.freedesktop.org/mailman/options/dri-devel>,
 <mailto:dri-devel-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <https://lists.freedesktop.org/archives/dri-devel>
List-Post: <mailto:dri-devel@lists.freedesktop.org>
List-Help: <mailto:dri-devel-request@lists.freedesktop.org?subject=help>
List-Subscribe: <https://lists.freedesktop.org/mailman/listinfo/dri-devel>,
 <mailto:dri-devel-request@lists.freedesktop.org?subject=subscribe>
Cc: Nathan Chancellor <nathan@kernel.org>, inux-kernel@vger.kernel.org,
 Geert Uytterhoeven <geert+renesas@glider.be>,
 Emil Velikov <emil.l.velikov@gmail.com>, dri-devel@lists.freedesktop.org,
 loongson-kernel@lists.loongnix.cn, Liu Peibao <liupeibao@loongson.cn>,
 linux-media@vger.kernel.org
Errors-To: dri-devel-bounces@lists.freedesktop.org
Sender: "dri-devel" <dri-devel-bounces@lists.freedesktop.org>

The patch is tested  on  3A5000 + 7A2000 board ,  it looks  works good.

Tested-by: Li Yi  <liyi@loongson.cn>

> From: Sui Jingfeng <suijingfeng@loongson.cn>
>
> Loongson display controller IP has been integrated in both Loongson north
> bridge chipset (ls7a1000/ls7a2000) and Loongson SoCs (ls2k1000/ls2k2000).
> It has even been included in Loongson's BMC products. It has two display
> pipes, and each display pipe supports a primary plane and a cursor plane.
>
> For the DC in the LS7a1000, each display pipe has a DVO output interface,
> which is able to support 1920x1080@60Hz. For the DC in the LS7A2000, each
> display pipe is equipped with a built-in HDMI encoder, which is compliant
> with the HDMI 1.4 specification. The first display pipe is also equipped
> with a transparent VGA encoder, which is parallel with the HDMI encoder.
> To get a decent performance for writing framebuffer data to the VRAM, the
> write combine support should be enabled.
>
> v1 -> v2:
>   1) Use hpd status reg when polling for ls7a2000.
>   2) Fix all warnings that emerged when compiling with W=1.
>
> v2 -> v3:
>   1) Add COMPILE_TEST to Kconfig and make the driver off by default
>   2) Alphabetical sorting headers (Thomas)
>   3) Untangle register access functions as much as possible (Thomas)
>   4) Switch to TTM-based memory manager (Thomas)
>   5) Add the chip ID detection function which can be used to distinguish
>      chip models
>   6) Revise the built-in HDMI phy driver, nearly all main stream mode below
>      4K@30Hz is tested, and this driver supports clone(mirror) display mode
>      and extend(joint) display mode.
>
> v3 -> v4:
>   1) Quickly fix a small mistake.
>
> v4 -> v5:
>   1) Add per display pipe debugfs support to the builtin HDMI encoder.
>
> v5 -> v6:
>   1) Remove stray code which didn't get used, say lsdc_of_get_reserved_ram
>   2) Fix all typos I could found, make sentences and code more readable
>   3) Untangle lsdc_hdmi*_connector_detect() function according to the pipe
>   4) Rename this driver as loongson.
>
> v6 -> v7:
> 1) Add prime support for buffer self-sharing, sharing buffer with
>     drm/etnaviv is also tested and it works with limitations.
> 2) Implement buffer object tracking with list_head.
> 3) Add S3(sleep to RAM) support
> 4) Rewrite lsdc_bo_move since TTM core stop allocating resources
>      during BO creation. Patch V1 ~ V6 of this series no longer work.
>      Thus, we send V7.
>
> v7 -> v8:
>   1) Zero a compile warning on a 32-bit platform, compile with W=1
>   2) Revise lsdc_bo_gpu_offset() and make minor cleanups.
>   3) Pageflip tested on the virtual terminal with the following commands:
>
>      modetest -M loongson -s 32:1920x1080 -v
>      modetest -M loongson -s 34:1920x1080 -v -F tiles
>
>     It works like a charm, when running the pageflip test with dual screens
>     configuration, another two additional BOs were created by the modetest,
>     VRAM usage up to 40+ MB, well we have at least 64MB, still enough.
>
>     # cat bos
>
>         bo[0000]: size:     8112kB VRAM
>         bo[0001]: size:       16kB VRAM
>         bo[0002]: size:       16kB VRAM
>         bo[0003]: size:    16208kB VRAM
>         bo[0004]: size:     8112kB VRAM
>         bo[0005]: size:     8112kB VRAM
>
> v8 -> v9:
>   1) Select I2C and I2C_ALGOBIT in Kconfig, should depend on MMU.
>   2) Using pci_get_domain_bus_and_slot to get the GPU device.
>
> v9 -> v10:
>   1) Revise lsdc_drm_freeze() to implement S3 correctly. We realized that
>      the pinned BO could not be moved, the VRAM lost power when sleeping
>      to RAM. Thus, the data in the buffer who is pinned in VRAM will get
>      lost when resumed. Yet it's not a big problem because this driver
>      relies on the CPU to update the front framebuffer. We can see the
>      garbage data when resume from S3, but the screen will show the right
>      image as I move the cursor. This is due to the CPU repaint. v10 of
>      this patch makes S3 perfect by unpin all of the BOs in VRAM, evict
>      them all to system RAM in lsdc_drm_freeze().
>
> v10 -> v11:
>   1) On a double-screen case, The buffer object backing the single giant
>      framebuffer is referenced by two GEM objects; hence, it will be
>      pinned at least twice by prepare_fb() function. This causes its pin
>      count > 1. V10 of this patch only unpins VRAM BOs once when suspend,
>      which is not correct on double-screen case. V11 of this patch unpin
>      the BOs until its pin count reaches zero when suspend. Then, we make
>      the S3 support complete finally. With v11, I can't see any garbage
>      data when resume.
>
>   2) Fix vblank wait timeout when disable CRTC.
>   3) Test against IGT, at least fbdev test and kms_flip test passed.
>   4) Rewrite pixel PLL update function, magic numbers eliminated (Emil)
>   5) Drop a few common hardware features description in lsdc_desc (Emil)
>   6) Drop lsdc_mode_config_mode_valid(), instead add restrictions in dumb
>      create function. (Emil)
>   7) Untangle the ls7a1000 case and ls7a2000 case completely (Thomas)
>
> v11 -> v12:
>   none
>
> v12 -> v13:
>   1) Add benchmarks to figure out the bandwidth of the hardware platform.
>      Usage:
>      # cd /sys/kernel/debug/dri/0/
>      # cat benchmark
>
>   2) VRAM is filled with garbage data if uninitialized, add a buffer
>      clearing procedure (lsdc_bo_clear), clear the BO on creation time.
>   3) Update copyrights and adjust coding style (Huacai)
>
> v13 -> v14:
>   1) Trying to add async update support for cursor plane.
>
> v14 -> v15:
>   1) Add lsdc_vga_set_decode() funciton, which allow us remove multi-video
>      cards workaround, now it allow drm/loongson, drm/amdgpu, drm/etnaviv
>      co-exist in the system, more is also possible (Emil and Xuerui)
>   2) Fix typos and grammar mistakes as much as possible (Xuerui)
>   3) Unify copyrights as GPL-2.0+ (Xuerui)
>   4) Fix a bug introduce since V13, TTM may import BO from other drivers,
>      we shouldn't clear it on such a case.
>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <mripard@kernel.org>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: David Airlie <airlied@gmail.com>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Sumit Semwal <sumit.semwal@linaro.org>
> Cc: "Christian König" <christian.koenig@amd.com>
> Cc: Nathan Chancellor <nathan@kernel.org>
> Cc: Emil Velikov <emil.l.velikov@gmail.com>
> Cc: Geert Uytterhoeven <geert+renesas@glider.be>
> Cc: loongson-kernel@lists.loongnix.cn
> Tested-by: Liu Peibao <liupeibao@loongson.cn>
> Signed-off-by: Sui Jingfeng <suijingfeng@loongson.cn>
> ---
>   drivers/gpu/drm/Kconfig                       |    2 +
>   drivers/gpu/drm/Makefile                      |    1 +
>   drivers/gpu/drm/loongson/Kconfig              |   17 +
>   drivers/gpu/drm/loongson/Makefile             |   22 +
>   drivers/gpu/drm/loongson/loongson_device.c    |  102 ++
>   drivers/gpu/drm/loongson/loongson_module.c    |   33 +
>   drivers/gpu/drm/loongson/loongson_module.h    |   12 +
>   drivers/gpu/drm/loongson/lsdc_benchmark.c     |  133 +++
>   drivers/gpu/drm/loongson/lsdc_benchmark.h     |   13 +
>   drivers/gpu/drm/loongson/lsdc_crtc.c          | 1024 +++++++++++++++++
>   drivers/gpu/drm/loongson/lsdc_debugfs.c       |  110 ++
>   drivers/gpu/drm/loongson/lsdc_drv.c           |  458 ++++++++
>   drivers/gpu/drm/loongson/lsdc_drv.h           |  388 +++++++
>   drivers/gpu/drm/loongson/lsdc_gem.c           |  311 +++++
>   drivers/gpu/drm/loongson/lsdc_gem.h           |   37 +
>   drivers/gpu/drm/loongson/lsdc_gfxpll.c        |  199 ++++
>   drivers/gpu/drm/loongson/lsdc_gfxpll.h        |   52 +
>   drivers/gpu/drm/loongson/lsdc_i2c.c           |  179 +++
>   drivers/gpu/drm/loongson/lsdc_i2c.h           |   29 +
>   drivers/gpu/drm/loongson/lsdc_irq.c           |   74 ++
>   drivers/gpu/drm/loongson/lsdc_irq.h           |   16 +
>   drivers/gpu/drm/loongson/lsdc_output.h        |   21 +
>   drivers/gpu/drm/loongson/lsdc_output_7a1000.c |  178 +++
>   drivers/gpu/drm/loongson/lsdc_output_7a2000.c |  552 +++++++++
>   drivers/gpu/drm/loongson/lsdc_pixpll.c        |  481 ++++++++
>   drivers/gpu/drm/loongson/lsdc_pixpll.h        |   86 ++
>   drivers/gpu/drm/loongson/lsdc_plane.c         |  799 +++++++++++++
>   drivers/gpu/drm/loongson/lsdc_probe.c         |   56 +
>   drivers/gpu/drm/loongson/lsdc_probe.h         |   12 +
>   drivers/gpu/drm/loongson/lsdc_regs.h          |  406 +++++++
>   drivers/gpu/drm/loongson/lsdc_ttm.c           |  591 ++++++++++
>   drivers/gpu/drm/loongson/lsdc_ttm.h           |   99 ++
>   32 files changed, 6493 insertions(+)
>   create mode 100644 drivers/gpu/drm/loongson/Kconfig
>   create mode 100644 drivers/gpu/drm/loongson/Makefile
>   create mode 100644 drivers/gpu/drm/loongson/loongson_device.c
>   create mode 100644 drivers/gpu/drm/loongson/loongson_module.c
>   create mode 100644 drivers/gpu/drm/loongson/loongson_module.h
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_benchmark.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_benchmark.h
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_crtc.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_debugfs.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_drv.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_drv.h
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_gem.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_gem.h
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_gfxpll.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_gfxpll.h
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_i2c.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_i2c.h
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_irq.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_irq.h
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_output.h
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_output_7a1000.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_output_7a2000.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_pixpll.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_pixpll.h
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_plane.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_probe.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_probe.h
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_regs.h
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_ttm.c
>   create mode 100644 drivers/gpu/drm/loongson/lsdc_ttm.h
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index afb3b2f5f425..cc9c9947fdef 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -323,6 +323,8 @@ source "drivers/gpu/drm/v3d/Kconfig"
>   
>   source "drivers/gpu/drm/vc4/Kconfig"
>   
> +source "drivers/gpu/drm/loongson/Kconfig"
> +
>   source "drivers/gpu/drm/etnaviv/Kconfig"
>   
>   source "drivers/gpu/drm/hisilicon/Kconfig"
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 7a09a89b493b..1c0f5204e47b 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -194,3 +194,4 @@ obj-y			+= gud/
>   obj-$(CONFIG_DRM_HYPERV) += hyperv/
>   obj-y			+= solomon/
>   obj-$(CONFIG_DRM_SPRD) += sprd/
> +obj-$(CONFIG_DRM_LOONGSON) += loongson/
> diff --git a/drivers/gpu/drm/loongson/Kconfig b/drivers/gpu/drm/loongson/Kconfig
> new file mode 100644
> index 000000000000..df6946d505fa
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/Kconfig
> @@ -0,0 +1,17 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +config DRM_LOONGSON
> +	tristate "DRM support for Loongson Graphics"
> +	depends on DRM && PCI && MMU
> +	select DRM_KMS_HELPER
> +	select DRM_TTM
> +	select I2C
> +	select I2C_ALGOBIT
> +	help
> +	  This is a DRM driver for Loongson Graphics, it may including
> +	  LS7A2000, LS7A1000, LS2K2000 and LS2K1000 etc. Loongson LS7A
> +	  series are bridge chipset, while Loongson LS2K series are SoC.
> +
> +	  If "M" is selected, the module will be called loongson.
> +
> +	  If in doubt, say "N".
> diff --git a/drivers/gpu/drm/loongson/Makefile b/drivers/gpu/drm/loongson/Makefile
> new file mode 100644
> index 000000000000..91e72bd900c1
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/Makefile
> @@ -0,0 +1,22 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +loongson-y := \
> +	lsdc_benchmark.o \
> +	lsdc_crtc.o \
> +	lsdc_debugfs.o \
> +	lsdc_drv.o \
> +	lsdc_gem.o \
> +	lsdc_gfxpll.o \
> +	lsdc_i2c.o \
> +	lsdc_irq.o \
> +	lsdc_output_7a1000.o \
> +	lsdc_output_7a2000.o \
> +	lsdc_plane.o \
> +	lsdc_pixpll.o \
> +	lsdc_probe.o \
> +	lsdc_ttm.o
> +
> +loongson-y += loongson_device.o \
> +	      loongson_module.o
> +
> +obj-$(CONFIG_DRM_LOONGSON) += loongson.o
> diff --git a/drivers/gpu/drm/loongson/loongson_device.c b/drivers/gpu/drm/loongson/loongson_device.c
> new file mode 100644
> index 000000000000..9986c8a2a255
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/loongson_device.c
> @@ -0,0 +1,102 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/pci.h>
> +
> +#include "lsdc_drv.h"
> +
> +static const struct lsdc_kms_funcs ls7a1000_kms_funcs = {
> +	.create_i2c = lsdc_create_i2c_chan,
> +	.irq_handler = ls7a1000_dc_irq_handler,
> +	.output_init = ls7a1000_output_init,
> +	.cursor_plane_init = ls7a1000_cursor_plane_init,
> +	.primary_plane_init = lsdc_primary_plane_init,
> +	.crtc_init = ls7a1000_crtc_init,
> +};
> +
> +static const struct lsdc_kms_funcs ls7a2000_kms_funcs = {
> +	.create_i2c = lsdc_create_i2c_chan,
> +	.irq_handler = ls7a2000_dc_irq_handler,
> +	.output_init = ls7a2000_output_init,
> +	.cursor_plane_init = ls7a2000_cursor_plane_init,
> +	.primary_plane_init = lsdc_primary_plane_init,
> +	.crtc_init = ls7a2000_crtc_init,
> +};
> +
> +static const struct loongson_gfx_desc ls7a1000_gfx = {
> +	.dc = {
> +		.num_of_crtc = 2,
> +		.max_pixel_clk = 200000,
> +		.max_width = 2048,
> +		.max_height = 2048,
> +		.num_of_hw_cursor = 1,
> +		.hw_cursor_w = 32,
> +		.hw_cursor_h = 32,
> +		.pitch_align = 256,
> +		.has_vblank_counter = false,
> +		.funcs = &ls7a1000_kms_funcs,
> +	},
> +	.conf_reg_base = LS7A1000_CONF_REG_BASE,
> +	.gfxpll = {
> +		.reg_offset = LS7A1000_PLL_GFX_REG,
> +		.reg_size = 8,
> +	},
> +	.pixpll = {
> +		[0] = {
> +			.reg_offset = LS7A1000_PIXPLL0_REG,
> +			.reg_size = 8,
> +		},
> +		[1] = {
> +			.reg_offset = LS7A1000_PIXPLL1_REG,
> +			.reg_size = 8,
> +		},
> +	},
> +	.chip_id = CHIP_LS7A1000,
> +	.model = "LS7A1000 bridge chipset",
> +};
> +
> +static const struct loongson_gfx_desc ls7a2000_gfx = {
> +	.dc = {
> +		.num_of_crtc = 2,
> +		.max_pixel_clk = 350000,
> +		.max_width = 4096,
> +		.max_height = 4096,
> +		.num_of_hw_cursor = 2,
> +		.hw_cursor_w = 64,
> +		.hw_cursor_h = 64,
> +		.pitch_align = 64,
> +		.has_vblank_counter = true,
> +		.funcs = &ls7a2000_kms_funcs,
> +	},
> +	.conf_reg_base = LS7A2000_CONF_REG_BASE,
> +	.gfxpll = {
> +		.reg_offset = LS7A2000_PLL_GFX_REG,
> +		.reg_size = 8,
> +	},
> +	.pixpll = {
> +		[0] = {
> +			.reg_offset = LS7A2000_PIXPLL0_REG,
> +			.reg_size = 8,
> +		},
> +		[1] = {
> +			.reg_offset = LS7A2000_PIXPLL1_REG,
> +			.reg_size = 8,
> +		},
> +	},
> +	.chip_id = CHIP_LS7A2000,
> +	.model = "LS7A2000 bridge chipset",
> +};
> +
> +static const struct lsdc_desc *__chip_id_desc_table[] = {
> +	[CHIP_LS7A1000] = &ls7a1000_gfx.dc,
> +	[CHIP_LS7A2000] = &ls7a2000_gfx.dc,
> +	[CHIP_LS_LAST] = NULL,
> +};
> +
> +const struct lsdc_desc *
> +lsdc_device_probe(struct pci_dev *pdev, enum loongson_chip_id chip_id)
> +{
> +	return __chip_id_desc_table[chip_id];
> +}
> diff --git a/drivers/gpu/drm/loongson/loongson_module.c b/drivers/gpu/drm/loongson/loongson_module.c
> new file mode 100644
> index 000000000000..d2a51bd395f6
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/loongson_module.c
> @@ -0,0 +1,33 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/pci.h>
> +
> +#include <video/nomodeset.h>
> +
> +#include "loongson_module.h"
> +
> +static int loongson_modeset = -1;
> +MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
> +module_param_named(modeset, loongson_modeset, int, 0400);
> +
> +int loongson_vblank = 1;
> +MODULE_PARM_DESC(vblank, "Disable/Enable hw vblank support");
> +module_param_named(vblank, loongson_vblank, int, 0400);
> +
> +static int __init loongson_module_init(void)
> +{
> +	if (!loongson_modeset || video_firmware_drivers_only())
> +		return -ENODEV;
> +
> +	return pci_register_driver(&lsdc_pci_driver);
> +}
> +module_init(loongson_module_init);
> +
> +static void __exit loongson_module_exit(void)
> +{
> +	pci_unregister_driver(&lsdc_pci_driver);
> +}
> +module_exit(loongson_module_exit);
> diff --git a/drivers/gpu/drm/loongson/loongson_module.h b/drivers/gpu/drm/loongson/loongson_module.h
> new file mode 100644
> index 000000000000..931c17521bf0
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/loongson_module.h
> @@ -0,0 +1,12 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LOONGSON_MODULE_H__
> +#define __LOONGSON_MODULE_H__
> +
> +extern int loongson_vblank;
> +extern struct pci_driver lsdc_pci_driver;
> +
> +#endif
> diff --git a/drivers/gpu/drm/loongson/lsdc_benchmark.c b/drivers/gpu/drm/loongson/lsdc_benchmark.c
> new file mode 100644
> index 000000000000..b088646a2ff9
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_benchmark.c
> @@ -0,0 +1,133 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <drm/drm_debugfs.h>
> +
> +#include "lsdc_benchmark.h"
> +#include "lsdc_drv.h"
> +#include "lsdc_gem.h"
> +#include "lsdc_ttm.h"
> +
> +typedef void (*lsdc_copy_proc_t)(struct lsdc_bo *src_bo,
> +				 struct lsdc_bo *dst_bo,
> +				 unsigned int size,
> +				 int n);
> +
> +static void lsdc_copy_gtt_to_vram_cpu(struct lsdc_bo *src_bo,
> +				      struct lsdc_bo *dst_bo,
> +				      unsigned int size,
> +				      int n)
> +{
> +	lsdc_bo_kmap(src_bo);
> +	lsdc_bo_kmap(dst_bo);
> +
> +	while (n--)
> +		memcpy_toio(dst_bo->kptr, src_bo->kptr, size);
> +
> +	lsdc_bo_kunmap(src_bo);
> +	lsdc_bo_kunmap(dst_bo);
> +}
> +
> +static void lsdc_copy_vram_to_gtt_cpu(struct lsdc_bo *src_bo,
> +				      struct lsdc_bo *dst_bo,
> +				      unsigned int size,
> +				      int n)
> +{
> +	lsdc_bo_kmap(src_bo);
> +	lsdc_bo_kmap(dst_bo);
> +
> +	while (n--)
> +		memcpy_fromio(dst_bo->kptr, src_bo->kptr, size);
> +
> +	lsdc_bo_kunmap(src_bo);
> +	lsdc_bo_kunmap(dst_bo);
> +}
> +
> +static void lsdc_copy_gtt_to_gtt_cpu(struct lsdc_bo *src_bo,
> +				     struct lsdc_bo *dst_bo,
> +				     unsigned int size,
> +				     int n)
> +{
> +	lsdc_bo_kmap(src_bo);
> +	lsdc_bo_kmap(dst_bo);
> +
> +	while (n--)
> +		memcpy(dst_bo->kptr, src_bo->kptr, size);
> +
> +	lsdc_bo_kunmap(src_bo);
> +	lsdc_bo_kunmap(dst_bo);
> +}
> +
> +static void lsdc_benchmark_copy(struct lsdc_device *ldev,
> +				unsigned int size,
> +				unsigned int n,
> +				u32 src_domain,
> +				u32 dst_domain,
> +				lsdc_copy_proc_t copy_proc,
> +				struct drm_printer *p)
> +{
> +	struct drm_device *ddev = &ldev->base;
> +	struct lsdc_bo *src_bo;
> +	struct lsdc_bo *dst_bo;
> +	unsigned long start_jiffies;
> +	unsigned long end_jiffies;
> +	unsigned int throughput;
> +	unsigned int time;
> +
> +	src_bo = lsdc_bo_create_kernel_pinned(ddev, src_domain, size);
> +	dst_bo = lsdc_bo_create_kernel_pinned(ddev, dst_domain, size);
> +
> +	start_jiffies = jiffies;
> +
> +	copy_proc(src_bo, dst_bo, size, n);
> +
> +	end_jiffies = jiffies;
> +
> +	lsdc_bo_free_kernel_pinned(src_bo);
> +	lsdc_bo_free_kernel_pinned(dst_bo);
> +
> +	time = jiffies_to_msecs(end_jiffies - start_jiffies);
> +
> +	throughput = (n * (size >> 10)) / time;
> +
> +	drm_printf(p,
> +		   "Copy bo of %uKiB %u times from %s to %s in %ums: %uMB/s\n",
> +		   size >> 10, n,
> +		   lsdc_domain_to_str(src_domain),
> +		   lsdc_domain_to_str(dst_domain),
> +		   time, throughput);
> +}
> +
> +int lsdc_show_benchmark_copy(struct lsdc_device *ldev, struct drm_printer *p)
> +{
> +	unsigned int buffer_size = 1920 * 1080 * 4;
> +	unsigned int iteration = 60;
> +
> +	lsdc_benchmark_copy(ldev,
> +			    buffer_size,
> +			    iteration,
> +			    LSDC_GEM_DOMAIN_GTT,
> +			    LSDC_GEM_DOMAIN_GTT,
> +			    lsdc_copy_gtt_to_gtt_cpu,
> +			    p);
> +
> +	lsdc_benchmark_copy(ldev,
> +			    buffer_size,
> +			    iteration,
> +			    LSDC_GEM_DOMAIN_GTT,
> +			    LSDC_GEM_DOMAIN_VRAM,
> +			    lsdc_copy_gtt_to_vram_cpu,
> +			    p);
> +
> +	lsdc_benchmark_copy(ldev,
> +			    buffer_size,
> +			    iteration,
> +			    LSDC_GEM_DOMAIN_VRAM,
> +			    LSDC_GEM_DOMAIN_GTT,
> +			    lsdc_copy_vram_to_gtt_cpu,
> +			    p);
> +
> +	return 0;
> +}
> diff --git a/drivers/gpu/drm/loongson/lsdc_benchmark.h b/drivers/gpu/drm/loongson/lsdc_benchmark.h
> new file mode 100644
> index 000000000000..36110278237e
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_benchmark.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LSDC_BENCHMARK_H__
> +#define __LSDC_BENCHMARK_H__
> +
> +#include "lsdc_drv.h"
> +
> +int lsdc_show_benchmark_copy(struct lsdc_device *ldev, struct drm_printer *p);
> +
> +#endif
> diff --git a/drivers/gpu/drm/loongson/lsdc_crtc.c b/drivers/gpu/drm/loongson/lsdc_crtc.c
> new file mode 100644
> index 000000000000..827acab580fa
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_crtc.c
> @@ -0,0 +1,1024 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/delay.h>
> +
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_debugfs.h>
> +#include <drm/drm_vblank.h>
> +
> +#include "lsdc_drv.h"
> +
> +/*
> + * After the CRTC soft reset, the vblank counter would be reset to zero.
> + * But the address and other settings in the CRTC register remain the same
> + * as before.
> + */
> +
> +static void lsdc_crtc0_soft_reset(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +	u32 val;
> +
> +	val = lsdc_rreg32(ldev, LSDC_CRTC0_CFG_REG);
> +
> +	val &= CFG_VALID_BITS_MASK;
> +
> +	/* Soft reset bit, active low */
> +	val &= ~CFG_RESET_N;
> +
> +	val &= ~CFG_PIX_FMT_MASK;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC0_CFG_REG, val);
> +
> +	udelay(1);
> +
> +	val |= CFG_RESET_N | LSDC_PF_XRGB8888 | CFG_OUTPUT_ENABLE;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC0_CFG_REG, val);
> +
> +	/* Wait about a vblank time */
> +	mdelay(20);
> +}
> +
> +static void lsdc_crtc1_soft_reset(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +	u32 val;
> +
> +	val = lsdc_rreg32(ldev, LSDC_CRTC1_CFG_REG);
> +
> +	val &= CFG_VALID_BITS_MASK;
> +
> +	/* Soft reset bit, active low */
> +	val &= ~CFG_RESET_N;
> +
> +	val &= ~CFG_PIX_FMT_MASK;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC1_CFG_REG, val);
> +
> +	udelay(1);
> +
> +	val |= CFG_RESET_N | LSDC_PF_XRGB8888 | CFG_OUTPUT_ENABLE;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC1_CFG_REG, val);
> +
> +	/* Wait about a vblank time */
> +	msleep(20);
> +}
> +
> +static void lsdc_crtc0_enable(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +	u32 val;
> +
> +	val = lsdc_rreg32(ldev, LSDC_CRTC0_CFG_REG);
> +
> +	/*
> +	 * This may happen in extremely rare cases, but a soft reset can
> +	 * bring it back to normal. We add a warning here, hoping to catch
> +	 * something if it happens.
> +	 */
> +	if (val & CRTC_ANCHORED) {
> +		drm_warn(&ldev->base, "%s stall\n", lcrtc->base.name);
> +		return lsdc_crtc0_soft_reset(lcrtc);
> +	}
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC0_CFG_REG, val | CFG_OUTPUT_ENABLE);
> +}
> +
> +static void lsdc_crtc0_disable(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_ureg32_clr(ldev, LSDC_CRTC0_CFG_REG, CFG_OUTPUT_ENABLE);
> +
> +	udelay(9);
> +}
> +
> +static void lsdc_crtc1_enable(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +	u32 val;
> +
> +	/*
> +	 * This may happen in extremely rare cases, but a soft reset can
> +	 * bring it back to normal. We add a warning here, hoping to catch
> +	 * something if it happens.
> +	 */
> +	val = lsdc_rreg32(ldev, LSDC_CRTC1_CFG_REG);
> +	if (val & CRTC_ANCHORED) {
> +		drm_warn(&ldev->base, "%s stall\n", lcrtc->base.name);
> +		return lsdc_crtc1_soft_reset(lcrtc);
> +	}
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC1_CFG_REG, val | CFG_OUTPUT_ENABLE);
> +}
> +
> +static void lsdc_crtc1_disable(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_ureg32_clr(ldev, LSDC_CRTC1_CFG_REG, CFG_OUTPUT_ENABLE);
> +
> +	udelay(9);
> +}
> +
> +/* All Loongson display controllers have hardware scanout position recoders */
> +
> +static void lsdc_crtc0_scan_pos(struct lsdc_crtc *lcrtc, int *hpos, int *vpos)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +	u32 val;
> +
> +	val = lsdc_rreg32(ldev, LSDC_CRTC0_SCAN_POS_REG);
> +
> +	*hpos = val >> 16;
> +	*vpos = val & 0xffff;
> +}
> +
> +static void lsdc_crtc1_scan_pos(struct lsdc_crtc *lcrtc, int *hpos, int *vpos)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +	u32 val;
> +
> +	val = lsdc_rreg32(ldev, LSDC_CRTC1_SCAN_POS_REG);
> +
> +	*hpos = val >> 16;
> +	*vpos = val & 0xffff;
> +}
> +
> +static void lsdc_crtc0_enable_vblank(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_ureg32_set(ldev, LSDC_INT_REG, INT_CRTC0_VSYNC_EN);
> +}
> +
> +static void lsdc_crtc0_disable_vblank(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_ureg32_clr(ldev, LSDC_INT_REG, INT_CRTC0_VSYNC_EN);
> +}
> +
> +static void lsdc_crtc1_enable_vblank(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_ureg32_set(ldev, LSDC_INT_REG, INT_CRTC1_VSYNC_EN);
> +}
> +
> +static void lsdc_crtc1_disable_vblank(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_ureg32_clr(ldev, LSDC_INT_REG, INT_CRTC1_VSYNC_EN);
> +}
> +
> +static void lsdc_crtc0_flip(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_ureg32_set(ldev, LSDC_CRTC0_CFG_REG, CFG_PAGE_FLIP);
> +}
> +
> +static void lsdc_crtc1_flip(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_ureg32_set(ldev, LSDC_CRTC1_CFG_REG, CFG_PAGE_FLIP);
> +}
> +
> +/*
> + * CRTC0 clone from CRTC1 or CRTC1 clone from CRTC0 using hardware logic
> + * This may be useful for custom cloning (TWIN) applications. Saving the
> + * bandwidth compared with the clone (mirroring) display mode provided by
> + * drm core.
> + */
> +
> +static void lsdc_crtc0_clone(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_ureg32_set(ldev, LSDC_CRTC0_CFG_REG, CFG_HW_CLONE);
> +}
> +
> +static void lsdc_crtc1_clone(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_ureg32_set(ldev, LSDC_CRTC1_CFG_REG, CFG_HW_CLONE);
> +}
> +
> +static void lsdc_crtc0_set_mode(struct lsdc_crtc *lcrtc,
> +				const struct drm_display_mode *mode)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC0_HDISPLAY_REG,
> +		    (mode->crtc_htotal << 16) | mode->crtc_hdisplay);
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC0_VDISPLAY_REG,
> +		    (mode->crtc_vtotal << 16) | mode->crtc_vdisplay);
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC0_HSYNC_REG,
> +		    (mode->crtc_hsync_end << 16) | mode->crtc_hsync_start | HSYNC_EN);
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC0_VSYNC_REG,
> +		    (mode->crtc_vsync_end << 16) | mode->crtc_vsync_start | VSYNC_EN);
> +}
> +
> +static void lsdc_crtc1_set_mode(struct lsdc_crtc *lcrtc,
> +				const struct drm_display_mode *mode)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC1_HDISPLAY_REG,
> +		    (mode->crtc_htotal << 16) | mode->crtc_hdisplay);
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC1_VDISPLAY_REG,
> +		    (mode->crtc_vtotal << 16) | mode->crtc_vdisplay);
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC1_HSYNC_REG,
> +		    (mode->crtc_hsync_end << 16) | mode->crtc_hsync_start | HSYNC_EN);
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC1_VSYNC_REG,
> +		    (mode->crtc_vsync_end << 16) | mode->crtc_vsync_start | VSYNC_EN);
> +}
> +
> +/*
> + * This is required for S3 support.
> + * After resuming from suspend, LSDC_CRTCx_CFG_REG (x = 0 or 1) is filled
> + * with garbage value, which causes the CRTC hang there.
> + *
> + * This function provides minimal settings for the affected registers.
> + * This overrides the firmware's settings on startup, making the CRTC work
> + * on our own, similar to the functional of GPU POST (Power On Self Test).
> + * Only touch CRTC hardware-related parts.
> + */
> +
> +static void lsdc_crtc0_reset(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC0_CFG_REG, CFG_RESET_N | LSDC_PF_XRGB8888);
> +}
> +
> +static void lsdc_crtc1_reset(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC1_CFG_REG, CFG_RESET_N | LSDC_PF_XRGB8888);
> +}
> +
> +static const struct lsdc_crtc_hw_ops ls7a1000_crtc_hw_ops[2] = {
> +	{
> +		.enable = lsdc_crtc0_enable,
> +		.disable = lsdc_crtc0_disable,
> +		.enable_vblank = lsdc_crtc0_enable_vblank,
> +		.disable_vblank = lsdc_crtc0_disable_vblank,
> +		.flip = lsdc_crtc0_flip,
> +		.clone = lsdc_crtc0_clone,
> +		.set_mode = lsdc_crtc0_set_mode,
> +		.get_scan_pos = lsdc_crtc0_scan_pos,
> +		.soft_reset = lsdc_crtc0_soft_reset,
> +		.reset = lsdc_crtc0_reset,
> +	},
> +	{
> +		.enable = lsdc_crtc1_enable,
> +		.disable = lsdc_crtc1_disable,
> +		.enable_vblank = lsdc_crtc1_enable_vblank,
> +		.disable_vblank = lsdc_crtc1_disable_vblank,
> +		.flip = lsdc_crtc1_flip,
> +		.clone = lsdc_crtc1_clone,
> +		.set_mode = lsdc_crtc1_set_mode,
> +		.get_scan_pos = lsdc_crtc1_scan_pos,
> +		.soft_reset = lsdc_crtc1_soft_reset,
> +		.reset = lsdc_crtc1_reset,
> +	},
> +};
> +
> +/*
> + * The 32-bit hardware vblank counter has been available since LS7A2000
> + * and LS2K2000. The counter increases even though the CRTC is disabled,
> + * it will be reset only if the CRTC is being soft reset.
> + * Those registers are also readable for ls7a1000, but its value does not
> + * change.
> + */
> +
> +static u32 lsdc_crtc0_get_vblank_count(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	return lsdc_rreg32(ldev, LSDC_CRTC0_VSYNC_COUNTER_REG);
> +}
> +
> +static u32 lsdc_crtc1_get_vblank_count(struct lsdc_crtc *lcrtc)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +
> +	return lsdc_rreg32(ldev, LSDC_CRTC1_VSYNC_COUNTER_REG);
> +}
> +
> +/*
> + * The DMA step bit fields are available since LS7A2000/LS2K2000, for
> + * supporting odd resolutions. But a large DMA step save the bandwidth.
> + * The larger, the better. Behavior of writing those bits on LS7A1000
> + * or LS2K1000 is underfined.
> + */
> +
> +static void lsdc_crtc0_set_dma_step(struct lsdc_crtc *lcrtc,
> +				    enum lsdc_dma_steps dma_step)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +	u32 val = lsdc_rreg32(ldev, LSDC_CRTC0_CFG_REG);
> +
> +	val &= ~CFG_DMA_STEP_MASK;
> +	val |= dma_step << CFG_DMA_STEP_SHIFT;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC0_CFG_REG, val);
> +}
> +
> +static void lsdc_crtc1_set_dma_step(struct lsdc_crtc *lcrtc,
> +				    enum lsdc_dma_steps dma_step)
> +{
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +	u32 val = lsdc_rreg32(ldev, LSDC_CRTC1_CFG_REG);
> +
> +	val &= ~CFG_DMA_STEP_MASK;
> +	val |= dma_step << CFG_DMA_STEP_SHIFT;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC1_CFG_REG, val);
> +}
> +
> +static const struct lsdc_crtc_hw_ops ls7a2000_crtc_hw_ops[2] = {
> +	{
> +		.enable = lsdc_crtc0_enable,
> +		.disable = lsdc_crtc0_disable,
> +		.enable_vblank = lsdc_crtc0_enable_vblank,
> +		.disable_vblank = lsdc_crtc0_disable_vblank,
> +		.flip = lsdc_crtc0_flip,
> +		.clone = lsdc_crtc0_clone,
> +		.set_mode = lsdc_crtc0_set_mode,
> +		.soft_reset = lsdc_crtc0_soft_reset,
> +		.get_scan_pos = lsdc_crtc0_scan_pos,
> +		.set_dma_step = lsdc_crtc0_set_dma_step,
> +		.get_vblank_counter = lsdc_crtc0_get_vblank_count,
> +		.reset = lsdc_crtc0_reset,
> +	},
> +	{
> +		.enable = lsdc_crtc1_enable,
> +		.disable = lsdc_crtc1_disable,
> +		.enable_vblank = lsdc_crtc1_enable_vblank,
> +		.disable_vblank = lsdc_crtc1_disable_vblank,
> +		.flip = lsdc_crtc1_flip,
> +		.clone = lsdc_crtc1_clone,
> +		.set_mode = lsdc_crtc1_set_mode,
> +		.get_scan_pos = lsdc_crtc1_scan_pos,
> +		.soft_reset = lsdc_crtc1_soft_reset,
> +		.set_dma_step = lsdc_crtc1_set_dma_step,
> +		.get_vblank_counter = lsdc_crtc1_get_vblank_count,
> +		.reset = lsdc_crtc1_reset,
> +	},
> +};
> +
> +static void lsdc_crtc_reset(struct drm_crtc *crtc)
> +{
> +	struct lsdc_crtc *lcrtc = to_lsdc_crtc(crtc);
> +	const struct lsdc_crtc_hw_ops *ops = lcrtc->hw_ops;
> +	struct lsdc_crtc_state *priv_crtc_state;
> +
> +	if (crtc->state)
> +		crtc->funcs->atomic_destroy_state(crtc, crtc->state);
> +
> +	priv_crtc_state = kzalloc(sizeof(*priv_crtc_state), GFP_KERNEL);
> +
> +	if (!priv_crtc_state)
> +		__drm_atomic_helper_crtc_reset(crtc, NULL);
> +	else
> +		__drm_atomic_helper_crtc_reset(crtc, &priv_crtc_state->base);
> +
> +	/* Reset the CRTC hardware, this is required for S3 support */
> +	ops->reset(lcrtc);
> +}
> +
> +static void lsdc_crtc_atomic_destroy_state(struct drm_crtc *crtc,
> +					   struct drm_crtc_state *state)
> +{
> +	struct lsdc_crtc_state *priv_state = to_lsdc_crtc_state(state);
> +
> +	__drm_atomic_helper_crtc_destroy_state(&priv_state->base);
> +
> +	kfree(priv_state);
> +}
> +
> +static struct drm_crtc_state *
> +lsdc_crtc_atomic_duplicate_state(struct drm_crtc *crtc)
> +{
> +	struct lsdc_crtc_state *new_priv_state;
> +	struct lsdc_crtc_state *old_priv_state;
> +
> +	new_priv_state = kzalloc(sizeof(*new_priv_state), GFP_KERNEL);
> +	if (!new_priv_state)
> +		return NULL;
> +
> +	__drm_atomic_helper_crtc_duplicate_state(crtc, &new_priv_state->base);
> +
> +	old_priv_state = to_lsdc_crtc_state(crtc->state);
> +
> +	memcpy(&new_priv_state->pparms, &old_priv_state->pparms,
> +	       sizeof(new_priv_state->pparms));
> +
> +	return &new_priv_state->base;
> +}
> +
> +static u32 lsdc_crtc_get_vblank_counter(struct drm_crtc *crtc)
> +{
> +	struct lsdc_crtc *lcrtc = to_lsdc_crtc(crtc);
> +
> +	/* 32-bit hardware vblank counter */
> +	return lcrtc->hw_ops->get_vblank_counter(lcrtc);
> +}
> +
> +static int lsdc_crtc_enable_vblank(struct drm_crtc *crtc)
> +{
> +	struct lsdc_crtc *lcrtc = to_lsdc_crtc(crtc);
> +
> +	if (!lcrtc->has_vblank)
> +		return -EINVAL;
> +
> +	lcrtc->hw_ops->enable_vblank(lcrtc);
> +
> +	return 0;
> +}
> +
> +static void lsdc_crtc_disable_vblank(struct drm_crtc *crtc)
> +{
> +	struct lsdc_crtc *lcrtc = to_lsdc_crtc(crtc);
> +
> +	if (!lcrtc->has_vblank)
> +		return;
> +
> +	lcrtc->hw_ops->disable_vblank(lcrtc);
> +}
> +
> +/*
> + * CRTC related debugfs
> + * Primary planes and cursor planes belong to the CRTC as well.
> + * For the sake of convenience, plane-related registers are also add here.
> + */
> +
> +#define REG_DEF(reg) { \
> +	.name = __stringify_1(LSDC_##reg##_REG), \
> +	.offset = LSDC_##reg##_REG, \
> +}
> +
> +static const struct lsdc_reg32 lsdc_crtc_regs_array[2][21] = {
> +	[0] = {
> +		REG_DEF(CRTC0_CFG),
> +		REG_DEF(CRTC0_FB_ORIGIN),
> +		REG_DEF(CRTC0_DVO_CONF),
> +		REG_DEF(CRTC0_HDISPLAY),
> +		REG_DEF(CRTC0_HSYNC),
> +		REG_DEF(CRTC0_VDISPLAY),
> +		REG_DEF(CRTC0_VSYNC),
> +		REG_DEF(CRTC0_GAMMA_INDEX),
> +		REG_DEF(CRTC0_GAMMA_DATA),
> +		REG_DEF(CRTC0_SYNC_DEVIATION),
> +		REG_DEF(CRTC0_VSYNC_COUNTER),
> +		REG_DEF(CRTC0_SCAN_POS),
> +		REG_DEF(CRTC0_STRIDE),
> +		REG_DEF(CRTC0_FB1_ADDR_HI),
> +		REG_DEF(CRTC0_FB1_ADDR_LO),
> +		REG_DEF(CRTC0_FB0_ADDR_HI),
> +		REG_DEF(CRTC0_FB0_ADDR_LO),
> +		REG_DEF(CURSOR0_CFG),
> +		REG_DEF(CURSOR0_POSITION),
> +		REG_DEF(CURSOR0_BG_COLOR),
> +		REG_DEF(CURSOR0_FG_COLOR),
> +	},
> +	[1] = {
> +		REG_DEF(CRTC1_CFG),
> +		REG_DEF(CRTC1_FB_ORIGIN),
> +		REG_DEF(CRTC1_DVO_CONF),
> +		REG_DEF(CRTC1_HDISPLAY),
> +		REG_DEF(CRTC1_HSYNC),
> +		REG_DEF(CRTC1_VDISPLAY),
> +		REG_DEF(CRTC1_VSYNC),
> +		REG_DEF(CRTC1_GAMMA_INDEX),
> +		REG_DEF(CRTC1_GAMMA_DATA),
> +		REG_DEF(CRTC1_SYNC_DEVIATION),
> +		REG_DEF(CRTC1_VSYNC_COUNTER),
> +		REG_DEF(CRTC1_SCAN_POS),
> +		REG_DEF(CRTC1_STRIDE),
> +		REG_DEF(CRTC1_FB1_ADDR_HI),
> +		REG_DEF(CRTC1_FB1_ADDR_LO),
> +		REG_DEF(CRTC1_FB0_ADDR_HI),
> +		REG_DEF(CRTC1_FB0_ADDR_LO),
> +		REG_DEF(CURSOR1_CFG),
> +		REG_DEF(CURSOR1_POSITION),
> +		REG_DEF(CURSOR1_BG_COLOR),
> +		REG_DEF(CURSOR1_FG_COLOR),
> +	},
> +};
> +
> +static int lsdc_crtc_show_regs(struct seq_file *m, void *arg)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *)m->private;
> +	struct lsdc_crtc *lcrtc = (struct lsdc_crtc *)node->info_ent->data;
> +	struct lsdc_device *ldev = lcrtc->ldev;
> +	unsigned int i;
> +
> +	for (i = 0; i < lcrtc->nreg; i++) {
> +		const struct lsdc_reg32 *preg = &lcrtc->preg[i];
> +		u32 offset = preg->offset;
> +
> +		seq_printf(m, "%s (0x%04x): 0x%08x\n",
> +			   preg->name, offset, lsdc_rreg32(ldev, offset));
> +	}
> +
> +	return 0;
> +}
> +
> +static int lsdc_crtc_show_scan_position(struct seq_file *m, void *arg)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *)m->private;
> +	struct lsdc_crtc *lcrtc = (struct lsdc_crtc *)node->info_ent->data;
> +	int x, y;
> +
> +	lcrtc->hw_ops->get_scan_pos(lcrtc, &x, &y);
> +	seq_printf(m, "Scanout position: x: %08u, y: %08u\n", x, y);
> +
> +	return 0;
> +}
> +
> +static int lsdc_crtc_show_vblank_counter(struct seq_file *m, void *arg)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *)m->private;
> +	struct lsdc_crtc *lcrtc = (struct lsdc_crtc *)node->info_ent->data;
> +
> +	if (lcrtc->hw_ops->get_vblank_counter)
> +		seq_printf(m, "%s vblank counter: %08u\n\n", lcrtc->base.name,
> +			   lcrtc->hw_ops->get_vblank_counter(lcrtc));
> +
> +	return 0;
> +}
> +
> +static int lsdc_pixpll_show_clock(struct seq_file *m, void *arg)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *)m->private;
> +	struct lsdc_crtc *lcrtc = (struct lsdc_crtc *)node->info_ent->data;
> +	struct lsdc_pixpll *pixpll = &lcrtc->pixpll;
> +	const struct lsdc_pixpll_funcs *funcs = pixpll->funcs;
> +	struct drm_crtc *crtc = &lcrtc->base;
> +	struct drm_display_mode *mode = &crtc->state->mode;
> +	struct drm_printer printer = drm_seq_file_printer(m);
> +	unsigned int out_khz;
> +
> +	out_khz = funcs->get_rate(pixpll);
> +
> +	seq_printf(m, "%s: %dx%d@%d\n", crtc->name,
> +		   mode->hdisplay, mode->vdisplay, drm_mode_vrefresh(mode));
> +
> +	seq_printf(m, "Pixel clock required: %d kHz\n", mode->clock);
> +	seq_printf(m, "Actual frequency output: %u kHz\n", out_khz);
> +	seq_printf(m, "Diff: %d kHz\n", out_khz - mode->clock);
> +
> +	funcs->print(pixpll, &printer);
> +
> +	return 0;
> +}
> +
> +static struct drm_info_list lsdc_crtc_debugfs_list[2][4] = {
> +	[0] = {
> +		{ "regs", lsdc_crtc_show_regs, 0, NULL },
> +		{ "pixclk", lsdc_pixpll_show_clock, 0, NULL },
> +		{ "scanpos", lsdc_crtc_show_scan_position, 0, NULL },
> +		{ "vblanks", lsdc_crtc_show_vblank_counter, 0, NULL },
> +	},
> +	[1] = {
> +		{ "regs", lsdc_crtc_show_regs, 0, NULL },
> +		{ "pixclk", lsdc_pixpll_show_clock, 0, NULL },
> +		{ "scanpos", lsdc_crtc_show_scan_position, 0, NULL },
> +		{ "vblanks", lsdc_crtc_show_vblank_counter, 0, NULL },
> +	},
> +};
> +
> +/* operate manually */
> +
> +static int lsdc_crtc_man_op_show(struct seq_file *m, void *data)
> +{
> +	seq_puts(m, "soft_reset: soft reset this CRTC\n");
> +	seq_puts(m, "enable: enable this CRTC\n");
> +	seq_puts(m, "disable: disable this CRTC\n");
> +	seq_puts(m, "flip: trigger the page flip\n");
> +	seq_puts(m, "clone: clone the another crtc with hardware logic\n");
> +
> +	return 0;
> +}
> +
> +static int lsdc_crtc_man_op_open(struct inode *inode, struct file *file)
> +{
> +	struct drm_crtc *crtc = inode->i_private;
> +
> +	return single_open(file, lsdc_crtc_man_op_show, crtc);
> +}
> +
> +static ssize_t lsdc_crtc_man_op_write(struct file *file,
> +				      const char __user *ubuf,
> +				      size_t len,
> +				      loff_t *offp)
> +{
> +	struct seq_file *m = file->private_data;
> +	struct lsdc_crtc *lcrtc = m->private;
> +	const struct lsdc_crtc_hw_ops *ops = lcrtc->hw_ops;
> +	char buf[16];
> +
> +	if (len > sizeof(buf) - 1)
> +		return -EINVAL;
> +
> +	if (copy_from_user(buf, ubuf, len))
> +		return -EFAULT;
> +
> +	buf[len] = '\0';
> +
> +	if (sysfs_streq(buf, "soft_reset"))
> +		ops->soft_reset(lcrtc);
> +	else if (sysfs_streq(buf, "enable"))
> +		ops->enable(lcrtc);
> +	else if (sysfs_streq(buf, "disable"))
> +		ops->disable(lcrtc);
> +	else if (sysfs_streq(buf, "flip"))
> +		ops->flip(lcrtc);
> +	else if (sysfs_streq(buf, "clone"))
> +		ops->clone(lcrtc);
> +
> +	return len;
> +}
> +
> +static const struct file_operations lsdc_crtc_man_op_fops = {
> +	.owner = THIS_MODULE,
> +	.open = lsdc_crtc_man_op_open,
> +	.read = seq_read,
> +	.llseek = seq_lseek,
> +	.release = single_release,
> +	.write = lsdc_crtc_man_op_write,
> +};
> +
> +static int lsdc_crtc_late_register(struct drm_crtc *crtc)
> +{
> +	struct lsdc_display_pipe *dispipe = crtc_to_display_pipe(crtc);
> +	struct lsdc_crtc *lcrtc = to_lsdc_crtc(crtc);
> +	struct drm_minor *minor = crtc->dev->primary;
> +	unsigned int index = dispipe->index;
> +	unsigned int i;
> +
> +	lcrtc->preg = lsdc_crtc_regs_array[index];
> +	lcrtc->nreg = ARRAY_SIZE(lsdc_crtc_regs_array[index]);
> +	lcrtc->p_info_list = lsdc_crtc_debugfs_list[index];
> +	lcrtc->n_info_list = ARRAY_SIZE(lsdc_crtc_debugfs_list[index]);
> +
> +	for (i = 0; i < lcrtc->n_info_list; ++i)
> +		lcrtc->p_info_list[i].data = lcrtc;
> +
> +	drm_debugfs_create_files(lcrtc->p_info_list, lcrtc->n_info_list,
> +				 crtc->debugfs_entry, minor);
> +
> +	/* Manual operations supported */
> +	debugfs_create_file("ops", 0644, crtc->debugfs_entry, lcrtc,
> +			    &lsdc_crtc_man_op_fops);
> +
> +	return 0;
> +}
> +
> +static void lsdc_crtc_atomic_print_state(struct drm_printer *p,
> +					 const struct drm_crtc_state *state)
> +{
> +	const struct lsdc_crtc_state *priv_state;
> +	const struct lsdc_pixpll_parms *pparms;
> +
> +	priv_state = container_of_const(state, struct lsdc_crtc_state, base);
> +	pparms = &priv_state->pparms;
> +
> +	drm_printf(p, "\tInput clock divider = %u\n", pparms->div_ref);
> +	drm_printf(p, "\tMedium clock multiplier = %u\n", pparms->loopc);
> +	drm_printf(p, "\tOutput clock divider = %u\n", pparms->div_out);
> +}
> +
> +static const struct drm_crtc_funcs ls7a1000_crtc_funcs = {
> +	.reset = lsdc_crtc_reset,
> +	.destroy = drm_crtc_cleanup,
> +	.set_config = drm_atomic_helper_set_config,
> +	.page_flip = drm_atomic_helper_page_flip,
> +	.atomic_duplicate_state = lsdc_crtc_atomic_duplicate_state,
> +	.atomic_destroy_state = lsdc_crtc_atomic_destroy_state,
> +	.late_register = lsdc_crtc_late_register,
> +	.enable_vblank = lsdc_crtc_enable_vblank,
> +	.disable_vblank = lsdc_crtc_disable_vblank,
> +	.get_vblank_timestamp = drm_crtc_vblank_helper_get_vblank_timestamp,
> +	.atomic_print_state = lsdc_crtc_atomic_print_state,
> +};
> +
> +static const struct drm_crtc_funcs ls7a2000_crtc_funcs = {
> +	.reset = lsdc_crtc_reset,
> +	.destroy = drm_crtc_cleanup,
> +	.set_config = drm_atomic_helper_set_config,
> +	.page_flip = drm_atomic_helper_page_flip,
> +	.atomic_duplicate_state = lsdc_crtc_atomic_duplicate_state,
> +	.atomic_destroy_state = lsdc_crtc_atomic_destroy_state,
> +	.late_register = lsdc_crtc_late_register,
> +	.get_vblank_counter = lsdc_crtc_get_vblank_counter,
> +	.enable_vblank = lsdc_crtc_enable_vblank,
> +	.disable_vblank = lsdc_crtc_disable_vblank,
> +	.get_vblank_timestamp = drm_crtc_vblank_helper_get_vblank_timestamp,
> +	.atomic_print_state = lsdc_crtc_atomic_print_state,
> +};
> +
> +static enum drm_mode_status
> +lsdc_crtc_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode)
> +{
> +	struct drm_device *ddev = crtc->dev;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	const struct lsdc_desc *descp = ldev->descp;
> +	unsigned int pitch;
> +
> +	if (mode->hdisplay > descp->max_width)
> +		return MODE_BAD_HVALUE;
> +
> +	if (mode->vdisplay > descp->max_height)
> +		return MODE_BAD_VVALUE;
> +
> +	if (mode->clock > descp->max_pixel_clk) {
> +		drm_dbg_kms(ddev, "mode %dx%d, pixel clock=%d is too high\n",
> +			    mode->hdisplay, mode->vdisplay, mode->clock);
> +		return MODE_CLOCK_HIGH;
> +	}
> +
> +	/* 4 for DRM_FORMAT_XRGB8888 */
> +	pitch = mode->hdisplay * 4;
> +
> +	if (pitch % descp->pitch_align) {
> +		drm_dbg_kms(ddev, "align to %u bytes is required: %u\n",
> +			    descp->pitch_align, pitch);
> +		return MODE_BAD_WIDTH;
> +	}
> +
> +	return MODE_OK;
> +}
> +
> +static int lsdc_pixpll_atomic_check(struct drm_crtc *crtc,
> +				    struct drm_crtc_state *state)
> +{
> +	struct lsdc_crtc *lcrtc = to_lsdc_crtc(crtc);
> +	struct lsdc_pixpll *pixpll = &lcrtc->pixpll;
> +	const struct lsdc_pixpll_funcs *pfuncs = pixpll->funcs;
> +	struct lsdc_crtc_state *priv_state = to_lsdc_crtc_state(state);
> +	unsigned int clock = state->mode.clock;
> +	int ret;
> +
> +	ret = pfuncs->compute(pixpll, clock, &priv_state->pparms);
> +	if (ret) {
> +		drm_warn(crtc->dev, "Failed to find PLL params for %ukHz\n",
> +			 clock);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int lsdc_crtc_helper_atomic_check(struct drm_crtc *crtc,
> +					 struct drm_atomic_state *state)
> +{
> +	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
> +
> +	if (!crtc_state->enable)
> +		return 0;
> +
> +	return lsdc_pixpll_atomic_check(crtc, crtc_state);
> +}
> +
> +static void lsdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
> +{
> +	struct lsdc_crtc *lcrtc = to_lsdc_crtc(crtc);
> +	const struct lsdc_crtc_hw_ops *crtc_hw_ops = lcrtc->hw_ops;
> +	struct lsdc_pixpll *pixpll = &lcrtc->pixpll;
> +	const struct lsdc_pixpll_funcs *pixpll_funcs = pixpll->funcs;
> +	struct drm_crtc_state *state = crtc->state;
> +	struct drm_display_mode *mode = &state->mode;
> +	struct lsdc_crtc_state *priv_state = to_lsdc_crtc_state(state);
> +
> +	pixpll_funcs->update(pixpll, &priv_state->pparms);
> +
> +	if (crtc_hw_ops->set_dma_step) {
> +		unsigned int width_in_bytes = mode->hdisplay * 4;
> +		enum lsdc_dma_steps dma_step;
> +
> +		/*
> +		 * Using DMA step as large as possible, for improving
> +		 * hardware DMA efficiency.
> +		 */
> +		if (width_in_bytes % 256 == 0)
> +			dma_step = LSDC_DMA_STEP_256_BYTES;
> +		else if (width_in_bytes % 128 == 0)
> +			dma_step = LSDC_DMA_STEP_128_BYTES;
> +		else if (width_in_bytes % 64 == 0)
> +			dma_step = LSDC_DMA_STEP_64_BYTES;
> +		else  /* width_in_bytes % 32 == 0 */
> +			dma_step = LSDC_DMA_STEP_32_BYTES;
> +
> +		crtc_hw_ops->set_dma_step(lcrtc, dma_step);
> +	}
> +
> +	crtc_hw_ops->set_mode(lcrtc, mode);
> +}
> +
> +static void lsdc_crtc_send_vblank(struct drm_crtc *crtc)
> +{
> +	struct drm_device *ddev = crtc->dev;
> +	unsigned long flags;
> +
> +	if (!crtc->state || !crtc->state->event)
> +		return;
> +
> +	drm_dbg(ddev, "Send vblank manually\n");
> +
> +	spin_lock_irqsave(&ddev->event_lock, flags);
> +	drm_crtc_send_vblank_event(crtc, crtc->state->event);
> +	crtc->state->event = NULL;
> +	spin_unlock_irqrestore(&ddev->event_lock, flags);
> +}
> +
> +static void lsdc_crtc_atomic_enable(struct drm_crtc *crtc,
> +				    struct drm_atomic_state *state)
> +{
> +	struct lsdc_crtc *lcrtc = to_lsdc_crtc(crtc);
> +
> +	if (lcrtc->has_vblank)
> +		drm_crtc_vblank_on(crtc);
> +
> +	lcrtc->hw_ops->enable(lcrtc);
> +}
> +
> +static void lsdc_crtc_atomic_disable(struct drm_crtc *crtc,
> +				     struct drm_atomic_state *state)
> +{
> +	struct lsdc_crtc *lcrtc = to_lsdc_crtc(crtc);
> +
> +	if (lcrtc->has_vblank)
> +		drm_crtc_vblank_off(crtc);
> +
> +	lcrtc->hw_ops->disable(lcrtc);
> +
> +	/*
> +	 * Make sure we issue a vblank event after disabling the CRTC if
> +	 * someone was waiting it.
> +	 */
> +	lsdc_crtc_send_vblank(crtc);
> +}
> +
> +static void lsdc_crtc_atomic_flush(struct drm_crtc *crtc,
> +				   struct drm_atomic_state *state)
> +{
> +	spin_lock_irq(&crtc->dev->event_lock);
> +	if (crtc->state->event) {
> +		if (drm_crtc_vblank_get(crtc) == 0)
> +			drm_crtc_arm_vblank_event(crtc, crtc->state->event);
> +		else
> +			drm_crtc_send_vblank_event(crtc, crtc->state->event);
> +		crtc->state->event = NULL;
> +	}
> +	spin_unlock_irq(&crtc->dev->event_lock);
> +}
> +
> +static bool lsdc_crtc_get_scanout_position(struct drm_crtc *crtc,
> +					   bool in_vblank_irq,
> +					   int *vpos,
> +					   int *hpos,
> +					   ktime_t *stime,
> +					   ktime_t *etime,
> +					   const struct drm_display_mode *mode)
> +{
> +	struct lsdc_crtc *lcrtc = to_lsdc_crtc(crtc);
> +	const struct lsdc_crtc_hw_ops *ops = lcrtc->hw_ops;
> +	int vsw, vbp, vactive_start, vactive_end, vfp_end;
> +	int x, y;
> +
> +	vsw = mode->crtc_vsync_end - mode->crtc_vsync_start;
> +	vbp = mode->crtc_vtotal - mode->crtc_vsync_end;
> +
> +	vactive_start = vsw + vbp + 1;
> +	vactive_end = vactive_start + mode->crtc_vdisplay;
> +
> +	/* last scan line before VSYNC */
> +	vfp_end = mode->crtc_vtotal;
> +
> +	if (stime)
> +		*stime = ktime_get();
> +
> +	ops->get_scan_pos(lcrtc, &x, &y);
> +
> +	if (y > vactive_end)
> +		y = y - vfp_end - vactive_start;
> +	else
> +		y -= vactive_start;
> +
> +	*vpos = y;
> +	*hpos = 0;
> +
> +	if (etime)
> +		*etime = ktime_get();
> +
> +	return true;
> +}
> +
> +static const struct drm_crtc_helper_funcs lsdc_crtc_helper_funcs = {
> +	.mode_valid = lsdc_crtc_mode_valid,
> +	.mode_set_nofb = lsdc_crtc_mode_set_nofb,
> +	.atomic_enable = lsdc_crtc_atomic_enable,
> +	.atomic_disable = lsdc_crtc_atomic_disable,
> +	.atomic_check = lsdc_crtc_helper_atomic_check,
> +	.atomic_flush = lsdc_crtc_atomic_flush,
> +	.get_scanout_position = lsdc_crtc_get_scanout_position,
> +};
> +
> +int ls7a1000_crtc_init(struct drm_device *ddev,
> +		       struct drm_crtc *crtc,
> +		       struct drm_plane *primary,
> +		       struct drm_plane *cursor,
> +		       unsigned int index,
> +		       bool has_vblank)
> +{
> +	struct lsdc_crtc *lcrtc = to_lsdc_crtc(crtc);
> +	int ret;
> +
> +	ret = lsdc_pixpll_init(&lcrtc->pixpll, ddev, index);
> +	if (ret) {
> +		drm_err(ddev, "pixel pll init failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	lcrtc->ldev = to_lsdc(ddev);
> +	lcrtc->has_vblank = has_vblank;
> +	lcrtc->hw_ops = &ls7a1000_crtc_hw_ops[index];
> +
> +	ret = drm_crtc_init_with_planes(ddev, crtc, primary, cursor,
> +					&ls7a1000_crtc_funcs,
> +					"LS-CRTC-%d", index);
> +	if (ret) {
> +		drm_err(ddev, "crtc init with planes failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	drm_crtc_helper_add(crtc, &lsdc_crtc_helper_funcs);
> +
> +	ret = drm_mode_crtc_set_gamma_size(crtc, 256);
> +	if (ret)
> +		return ret;
> +
> +	drm_crtc_enable_color_mgmt(crtc, 0, false, 256);
> +
> +	return 0;
> +}
> +
> +int ls7a2000_crtc_init(struct drm_device *ddev,
> +		       struct drm_crtc *crtc,
> +		       struct drm_plane *primary,
> +		       struct drm_plane *cursor,
> +		       unsigned int index,
> +		       bool has_vblank)
> +{
> +	struct lsdc_crtc *lcrtc = to_lsdc_crtc(crtc);
> +	int ret;
> +
> +	ret = lsdc_pixpll_init(&lcrtc->pixpll, ddev, index);
> +	if (ret) {
> +		drm_err(ddev, "crtc init with pll failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	lcrtc->ldev = to_lsdc(ddev);
> +	lcrtc->has_vblank = has_vblank;
> +	lcrtc->hw_ops = &ls7a2000_crtc_hw_ops[index];
> +
> +	ret = drm_crtc_init_with_planes(ddev, crtc, primary, cursor,
> +					&ls7a2000_crtc_funcs,
> +					"LS-CRTC-%u", index);
> +	if (ret) {
> +		drm_err(ddev, "crtc init with planes failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	drm_crtc_helper_add(crtc, &lsdc_crtc_helper_funcs);
> +
> +	ret = drm_mode_crtc_set_gamma_size(crtc, 256);
> +	if (ret)
> +		return ret;
> +
> +	drm_crtc_enable_color_mgmt(crtc, 0, false, 256);
> +
> +	return 0;
> +}
> diff --git a/drivers/gpu/drm/loongson/lsdc_debugfs.c b/drivers/gpu/drm/loongson/lsdc_debugfs.c
> new file mode 100644
> index 000000000000..b9c2e6b1701f
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_debugfs.c
> @@ -0,0 +1,110 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <drm/drm_debugfs.h>
> +
> +#include "lsdc_benchmark.h"
> +#include "lsdc_drv.h"
> +#include "lsdc_gem.h"
> +#include "lsdc_probe.h"
> +#include "lsdc_ttm.h"
> +
> +/* device level debugfs */
> +
> +static int lsdc_identify(struct seq_file *m, void *arg)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *)m->private;
> +	struct lsdc_device *ldev = (struct lsdc_device *)node->info_ent->data;
> +	const struct loongson_gfx_desc *gfx = to_loongson_gfx(ldev->descp);
> +	u8 impl, rev;
> +
> +	loongson_cpu_get_prid(&impl, &rev);
> +
> +	seq_printf(m, "Running on cpu 0x%x, cpu revision: 0x%x\n",
> +		   impl, rev);
> +
> +	seq_printf(m, "Contained in: %s\n", gfx->model);
> +
> +	return 0;
> +}
> +
> +static int lsdc_show_mm(struct seq_file *m, void *arg)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *)m->private;
> +	struct drm_device *ddev = node->minor->dev;
> +	struct drm_printer p = drm_seq_file_printer(m);
> +
> +	drm_mm_print(&ddev->vma_offset_manager->vm_addr_space_mm, &p);
> +
> +	return 0;
> +}
> +
> +static int lsdc_show_gfxpll_clock(struct seq_file *m, void *arg)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *)m->private;
> +	struct lsdc_device *ldev = (struct lsdc_device *)node->info_ent->data;
> +	struct drm_printer printer = drm_seq_file_printer(m);
> +	struct loongson_gfxpll *gfxpll = ldev->gfxpll;
> +
> +	gfxpll->funcs->print(gfxpll, &printer, true);
> +
> +	return 0;
> +}
> +
> +static int lsdc_show_benchmark(struct seq_file *m, void *arg)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *)m->private;
> +	struct lsdc_device *ldev = (struct lsdc_device *)node->info_ent->data;
> +	struct drm_printer printer = drm_seq_file_printer(m);
> +
> +	lsdc_show_benchmark_copy(ldev, &printer);
> +
> +	return 0;
> +}
> +
> +static int lsdc_pdev_enable_io_mem(struct seq_file *m, void *arg)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *)m->private;
> +	struct lsdc_device *ldev = (struct lsdc_device *)node->info_ent->data;
> +	u16 cmd;
> +
> +	pci_read_config_word(ldev->dc, PCI_COMMAND, &cmd);
> +
> +	seq_printf(m, "PCI_COMMAND: 0x%x\n", cmd);
> +
> +	cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_IO;
> +
> +	pci_write_config_word(ldev->dc, PCI_COMMAND, cmd);
> +
> +	pci_read_config_word(ldev->dc, PCI_COMMAND, &cmd);
> +
> +	seq_printf(m, "PCI_COMMAND: 0x%x\n", cmd);
> +
> +	return 0;
> +}
> +
> +static struct drm_info_list lsdc_debugfs_list[] = {
> +	{ "benchmark",   lsdc_show_benchmark, 0, NULL },
> +	{ "bos",         lsdc_show_buffer_object, 0, NULL },
> +	{ "chips",       lsdc_identify, 0, NULL },
> +	{ "clocks",      lsdc_show_gfxpll_clock, 0, NULL },
> +	{ "dc_enable",   lsdc_pdev_enable_io_mem, 0, NULL },
> +	{ "mm",          lsdc_show_mm, 0, NULL },
> +};
> +
> +void lsdc_debugfs_init(struct drm_minor *minor)
> +{
> +	struct drm_device *ddev = minor->dev;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	unsigned int n = ARRAY_SIZE(lsdc_debugfs_list);
> +	unsigned int i;
> +
> +	for (i = 0; i < n; ++i)
> +		lsdc_debugfs_list[i].data = ldev;
> +
> +	drm_debugfs_create_files(lsdc_debugfs_list, n, minor->debugfs_root, minor);
> +
> +	lsdc_ttm_debugfs_init(ldev);
> +}
> diff --git a/drivers/gpu/drm/loongson/lsdc_drv.c b/drivers/gpu/drm/loongson/lsdc_drv.c
> new file mode 100644
> index 000000000000..7369a9afb1d9
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_drv.c
> @@ -0,0 +1,458 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/pci.h>
> +#include <linux/vgaarb.h>
> +
> +#include <drm/drm_aperture.h>
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_fbdev_generic.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_ioctl.h>
> +#include <drm/drm_modeset_helper.h>
> +#include <drm/drm_probe_helper.h>
> +#include <drm/drm_vblank.h>
> +
> +#include "loongson_module.h"
> +#include "lsdc_drv.h"
> +#include "lsdc_gem.h"
> +#include "lsdc_ttm.h"
> +
> +#define DRIVER_AUTHOR               "Sui Jingfeng <suijingfeng@loongson.cn>"
> +#define DRIVER_NAME                 "loongson"
> +#define DRIVER_DESC                 "drm driver for loongson graphics"
> +#define DRIVER_DATE                 "20220701"
> +#define DRIVER_MAJOR                1
> +#define DRIVER_MINOR                0
> +#define DRIVER_PATCHLEVEL           0
> +
> +DEFINE_DRM_GEM_FOPS(lsdc_gem_fops);
> +
> +static const struct drm_driver lsdc_drm_driver = {
> +	.driver_features = DRIVER_MODESET | DRIVER_RENDER | DRIVER_GEM | DRIVER_ATOMIC,
> +	.fops = &lsdc_gem_fops,
> +
> +	.name = DRIVER_NAME,
> +	.desc = DRIVER_DESC,
> +	.date = DRIVER_DATE,
> +	.major = DRIVER_MAJOR,
> +	.minor = DRIVER_MINOR,
> +	.patchlevel = DRIVER_PATCHLEVEL,
> +
> +	.debugfs_init = lsdc_debugfs_init,
> +	.dumb_create = lsdc_dumb_create,
> +	.dumb_map_offset = lsdc_dumb_map_offset,
> +	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
> +	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
> +	.gem_prime_import_sg_table = lsdc_prime_import_sg_table,
> +};
> +
> +static const struct drm_mode_config_funcs lsdc_mode_config_funcs = {
> +	.fb_create = drm_gem_fb_create,
> +	.atomic_check = drm_atomic_helper_check,
> +	.atomic_commit = drm_atomic_helper_commit,
> +};
> +
> +/* Display related */
> +
> +static int lsdc_modeset_init(struct lsdc_device *ldev,
> +			     unsigned int num_crtc,
> +			     const struct lsdc_kms_funcs *funcs,
> +			     bool has_vblank)
> +{
> +	struct drm_device *ddev = &ldev->base;
> +	struct lsdc_display_pipe *dispipe;
> +	unsigned int i;
> +	int ret;
> +
> +	for (i = 0; i < num_crtc; i++) {
> +		dispipe = &ldev->dispipe[i];
> +
> +		/* We need an index before crtc is initialized */
> +		dispipe->index = i;
> +
> +		ret = funcs->create_i2c(ddev, dispipe, i);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	for (i = 0; i < num_crtc; i++) {
> +		struct i2c_adapter *ddc = NULL;
> +
> +		dispipe = &ldev->dispipe[i];
> +		if (dispipe->li2c)
> +			ddc = &dispipe->li2c->adapter;
> +
> +		ret = funcs->output_init(ddev, dispipe, ddc, i);
> +		if (ret)
> +			return ret;
> +
> +		ldev->num_output++;
> +	}
> +
> +	for (i = 0; i < num_crtc; i++) {
> +		dispipe = &ldev->dispipe[i];
> +
> +		ret = funcs->primary_plane_init(ddev, &dispipe->primary.base, i);
> +		if (ret)
> +			return ret;
> +
> +		ret = funcs->cursor_plane_init(ddev, &dispipe->cursor.base, i);
> +		if (ret)
> +			return ret;
> +
> +		ret = funcs->crtc_init(ddev, &dispipe->crtc.base,
> +				       &dispipe->primary.base,
> +				       &dispipe->cursor.base,
> +				       i, has_vblank);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	drm_info(ddev, "Total %u outputs\n", ldev->num_output);
> +
> +	return 0;
> +}
> +
> +static const struct drm_mode_config_helper_funcs lsdc_mode_config_helper_funcs = {
> +	.atomic_commit_tail = drm_atomic_helper_commit_tail,
> +};
> +
> +static int lsdc_mode_config_init(struct drm_device *ddev,
> +				 const struct lsdc_desc *descp)
> +{
> +	int ret;
> +
> +	ret = drmm_mode_config_init(ddev);
> +	if (ret)
> +		return ret;
> +
> +	ddev->mode_config.funcs = &lsdc_mode_config_funcs;
> +	ddev->mode_config.min_width = 1;
> +	ddev->mode_config.min_height = 1;
> +	ddev->mode_config.max_width = descp->max_width * LSDC_NUM_CRTC;
> +	ddev->mode_config.max_height = descp->max_height * LSDC_NUM_CRTC;
> +	ddev->mode_config.preferred_depth = 24;
> +	ddev->mode_config.prefer_shadow = 1;
> +
> +	ddev->mode_config.cursor_width = descp->hw_cursor_h;
> +	ddev->mode_config.cursor_height = descp->hw_cursor_h;
> +
> +	ddev->mode_config.helper_private = &lsdc_mode_config_helper_funcs;
> +
> +	if (descp->has_vblank_counter)
> +		ddev->max_vblank_count = 0xffffffff;
> +
> +	return ret;
> +}
> +
> +/*
> + * The GPU and display controller in the LS7A1000/LS7A2000/LS2K2000 are
> + * separated PCIE devices. They are two devices, not one. Bar 2 of the GPU
> + * device contains the base address and size of the VRAM, both the GPU and
> + * the DC could access the on-board VRAM.
> + */
> +static int lsdc_get_dedicated_vram(struct lsdc_device *ldev,
> +				   struct pci_dev *pdev_dc,
> +				   const struct lsdc_desc *descp)
> +{
> +	struct drm_device *ddev = &ldev->base;
> +	struct pci_dev *pdev_gpu;
> +	resource_size_t base, size;
> +
> +	/*
> +	 * The GPU has 00:06.0 as its BDF, while the DC has 00:06.1
> +	 * This is true for the LS7A1000, LS7A2000 and LS2K2000.
> +	 */
> +	pdev_gpu = pci_get_domain_bus_and_slot(pci_domain_nr(pdev_dc->bus),
> +					       pdev_dc->bus->number,
> +					       PCI_DEVFN(6, 0));
> +	if (!pdev_gpu) {
> +		drm_err(ddev, "No GPU device, then no VRAM\n");
> +		return -ENODEV;
> +	}
> +
> +	base = pci_resource_start(pdev_gpu, 2);
> +	size = pci_resource_len(pdev_gpu, 2);
> +
> +	ldev->vram_base = base;
> +	ldev->vram_size = size;
> +	ldev->gpu = pdev_gpu;
> +
> +	drm_info(ddev, "Dedicated vram start: 0x%llx, size: %uMiB\n",
> +		 (u64)base, (u32)(size >> 20));
> +
> +	return 0;
> +}
> +
> +static struct lsdc_device *
> +lsdc_create_device(struct pci_dev *pdev,
> +		   const struct lsdc_desc *descp,
> +		   const struct drm_driver *driver)
> +{
> +	struct lsdc_device *ldev;
> +	struct drm_device *ddev;
> +	int ret;
> +
> +	ldev = devm_drm_dev_alloc(&pdev->dev, driver, struct lsdc_device, base);
> +	if (IS_ERR(ldev))
> +		return ldev;
> +
> +	ldev->dc = pdev;
> +	ldev->descp = descp;
> +
> +	ddev = &ldev->base;
> +
> +	loongson_gfxpll_create(ddev, &ldev->gfxpll);
> +
> +	ret = lsdc_get_dedicated_vram(ldev, pdev, descp);
> +	if (ret) {
> +		drm_err(ddev, "Init VRAM failed: %d\n", ret);
> +		return ERR_PTR(ret);
> +	}
> +
> +	ret = drm_aperture_remove_conflicting_framebuffers(ldev->vram_base,
> +							   ldev->vram_size,
> +							   driver);
> +	if (ret) {
> +		drm_err(ddev, "Remove firmware framebuffers failed: %d\n", ret);
> +		return ERR_PTR(ret);
> +	}
> +
> +	ret = lsdc_ttm_init(ldev);
> +	if (ret) {
> +		drm_err(ddev, "Memory manager init failed: %d\n", ret);
> +		return ERR_PTR(ret);
> +	}
> +
> +	lsdc_gem_init(ddev);
> +
> +	/* Bar 0 of the DC device contains the MMIO register's base address */
> +	ldev->reg_base = pcim_iomap(pdev, 0, 0);
> +	if (!ldev->reg_base)
> +		return ERR_PTR(-ENODEV);
> +
> +	spin_lock_init(&ldev->reglock);
> +
> +	ret = lsdc_mode_config_init(ddev, descp);
> +	if (ret)
> +		return ERR_PTR(ret);
> +
> +	ret = lsdc_modeset_init(ldev, descp->num_of_crtc, descp->funcs,
> +				loongson_vblank);
> +	if (ret)
> +		return ERR_PTR(ret);
> +
> +	drm_mode_config_reset(ddev);
> +
> +	return ldev;
> +}
> +
> +/* For multiple GPU driver instance co-exixt in the system */
> +
> +static unsigned int lsdc_vga_set_decode(struct pci_dev *pdev, bool state)
> +{
> +	return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
> +}
> +
> +static int lsdc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> +{
> +	const struct lsdc_desc *descp;
> +	struct drm_device *ddev;
> +	struct lsdc_device *ldev;
> +	int ret;
> +
> +	descp = lsdc_device_probe(pdev, ent->driver_data);
> +	if (IS_ERR_OR_NULL(descp))
> +		return -ENODEV;
> +
> +	pci_set_master(pdev);
> +
> +	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40));
> +	if (ret)
> +		return ret;
> +
> +	ret = pcim_enable_device(pdev);
> +	if (ret)
> +		return ret;
> +
> +	dev_info(&pdev->dev, "Found %s, revision: %u",
> +		 to_loongson_gfx(descp)->model, pdev->revision);
> +
> +	ldev = lsdc_create_device(pdev, descp, &lsdc_drm_driver);
> +	if (IS_ERR(ldev))
> +		return PTR_ERR(ldev);
> +
> +	ddev = &ldev->base;
> +
> +	pci_set_drvdata(pdev, ddev);
> +
> +	vga_client_register(pdev, lsdc_vga_set_decode);
> +
> +	drm_kms_helper_poll_init(ddev);
> +
> +	if (loongson_vblank) {
> +		ret = drm_vblank_init(ddev, descp->num_of_crtc);
> +		if (ret)
> +			return ret;
> +
> +		ret = devm_request_irq(&pdev->dev, pdev->irq,
> +				       descp->funcs->irq_handler,
> +				       IRQF_SHARED,
> +				       dev_name(&pdev->dev), ddev);
> +		if (ret) {
> +			drm_err(ddev, "Failed to register interrupt: %d\n", ret);
> +			return ret;
> +		}
> +
> +		drm_info(ddev, "registered irq: %u\n", pdev->irq);
> +	}
> +
> +	ret = drm_dev_register(ddev, 0);
> +	if (ret)
> +		return ret;
> +
> +	drm_fbdev_generic_setup(ddev, 32);
> +
> +	return 0;
> +}
> +
> +static void lsdc_pci_remove(struct pci_dev *pdev)
> +{
> +	struct drm_device *ddev = pci_get_drvdata(pdev);
> +
> +	drm_dev_unregister(ddev);
> +	drm_atomic_helper_shutdown(ddev);
> +}
> +
> +static int lsdc_drm_freeze(struct drm_device *ddev)
> +{
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	struct lsdc_bo *lbo;
> +	int ret;
> +
> +	/* unpin all of buffers in the VRAM */
> +	mutex_lock(&ldev->gem.mutex);
> +	list_for_each_entry(lbo, &ldev->gem.objects, list) {
> +		struct ttm_buffer_object *tbo = &lbo->tbo;
> +		struct ttm_resource *resource = tbo->resource;
> +		unsigned int pin_count = tbo->pin_count;
> +
> +		drm_dbg(ddev, "bo[%p], size: %zuKiB, type: %s, pin count: %u\n",
> +			lbo, lsdc_bo_size(lbo) >> 10,
> +			lsdc_mem_type_to_str(resource->mem_type), pin_count);
> +
> +		if (!pin_count)
> +			continue;
> +
> +		if (resource->mem_type == TTM_PL_VRAM) {
> +			ret = lsdc_bo_reserve(lbo);
> +			if (unlikely(ret)) {
> +				drm_err(ddev, "bo reserve failed: %d\n", ret);
> +				continue;
> +			}
> +
> +			do {
> +				lsdc_bo_unpin(lbo);
> +				--pin_count;
> +			} while (pin_count);
> +
> +			lsdc_bo_unreserve(lbo);
> +		}
> +	}
> +	mutex_unlock(&ldev->gem.mutex);
> +
> +	lsdc_bo_evict_vram(ddev);
> +
> +	ret = drm_mode_config_helper_suspend(ddev);
> +	if (unlikely(ret)) {
> +		drm_err(ddev, "Freeze error: %d", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int lsdc_drm_resume(struct device *dev)
> +{
> +	struct pci_dev *pdev = to_pci_dev(dev);
> +	struct drm_device *ddev = pci_get_drvdata(pdev);
> +
> +	return drm_mode_config_helper_resume(ddev);
> +}
> +
> +static int lsdc_pm_freeze(struct device *dev)
> +{
> +	struct pci_dev *pdev = to_pci_dev(dev);
> +	struct drm_device *ddev = pci_get_drvdata(pdev);
> +
> +	return lsdc_drm_freeze(ddev);
> +}
> +
> +static int lsdc_pm_thaw(struct device *dev)
> +{
> +	return lsdc_drm_resume(dev);
> +}
> +
> +static int lsdc_pm_suspend(struct device *dev)
> +{
> +	struct pci_dev *pdev = to_pci_dev(dev);
> +	int error;
> +
> +	error = lsdc_pm_freeze(dev);
> +	if (error)
> +		return error;
> +
> +	pci_save_state(pdev);
> +	/* Shut down the device */
> +	pci_disable_device(pdev);
> +	pci_set_power_state(pdev, PCI_D3hot);
> +
> +	return 0;
> +}
> +
> +static int lsdc_pm_resume(struct device *dev)
> +{
> +	struct pci_dev *pdev = to_pci_dev(dev);
> +
> +	pci_set_power_state(pdev, PCI_D0);
> +
> +	pci_restore_state(pdev);
> +
> +	if (pcim_enable_device(pdev))
> +		return -EIO;
> +
> +	return lsdc_pm_thaw(dev);
> +}
> +
> +static const struct dev_pm_ops lsdc_pm_ops = {
> +	.suspend = lsdc_pm_suspend,
> +	.resume = lsdc_pm_resume,
> +	.freeze = lsdc_pm_freeze,
> +	.thaw = lsdc_pm_thaw,
> +	.poweroff = lsdc_pm_freeze,
> +	.restore = lsdc_pm_resume,
> +};
> +
> +static const struct pci_device_id lsdc_pciid_list[] = {
> +	{PCI_VDEVICE(LOONGSON, 0x7a06), CHIP_LS7A1000},
> +	{PCI_VDEVICE(LOONGSON, 0x7a36), CHIP_LS7A2000},
> +	{ }
> +};
> +
> +struct pci_driver lsdc_pci_driver = {
> +	.name = DRIVER_NAME,
> +	.id_table = lsdc_pciid_list,
> +	.probe = lsdc_pci_probe,
> +	.remove = lsdc_pci_remove,
> +	.driver.pm = &lsdc_pm_ops,
> +};
> +
> +MODULE_DEVICE_TABLE(pci, lsdc_pciid_list);
> +MODULE_AUTHOR(DRIVER_AUTHOR);
> +MODULE_DESCRIPTION(DRIVER_DESC);
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/gpu/drm/loongson/lsdc_drv.h b/drivers/gpu/drm/loongson/lsdc_drv.h
> new file mode 100644
> index 000000000000..fbf2d760ef27
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_drv.h
> @@ -0,0 +1,388 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LSDC_DRV_H__
> +#define __LSDC_DRV_H__
> +
> +#include <linux/pci.h>
> +
> +#include <drm/drm_connector.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_device.h>
> +#include <drm/drm_encoder.h>
> +#include <drm/drm_file.h>
> +#include <drm/drm_plane.h>
> +#include <drm/ttm/ttm_device.h>
> +
> +#include "lsdc_i2c.h"
> +#include "lsdc_irq.h"
> +#include "lsdc_gfxpll.h"
> +#include "lsdc_output.h"
> +#include "lsdc_pixpll.h"
> +#include "lsdc_regs.h"
> +
> +/* Currently, all Loongson display controllers have two display pipes. */
> +#define LSDC_NUM_CRTC           2
> +
> +/*
> + * LS7A1000/LS7A2000 chipsets function as the south & north bridges of the
> + * Loongson 3 series processors, they are equipped with on-board video RAM
> + * typically. While Loongson LS2K series are low cost SoCs which share the
> + * system RAM as video RAM, they don't has a dedicated VRAM.
> + *
> + * There is only a 1:1 mapping of crtcs, encoders and connectors for the DC
> + *
> + * display pipe 0 = crtc0 + dvo0 + encoder0 + connector0 + cursor0 + primary0
> + * display pipe 1 = crtc1 + dvo1 + encoder1 + connectro1 + cursor1 + primary1
> + */
> +
> +enum loongson_chip_id {
> +	CHIP_LS7A1000 = 0,
> +	CHIP_LS7A2000 = 1,
> +	CHIP_LS_LAST,
> +};
> +
> +const struct lsdc_desc *
> +lsdc_device_probe(struct pci_dev *pdev, enum loongson_chip_id chip);
> +
> +struct lsdc_kms_funcs;
> +
> +/* DC specific */
> +
> +struct lsdc_desc {
> +	u32 num_of_crtc;
> +	u32 max_pixel_clk;
> +	u32 max_width;
> +	u32 max_height;
> +	u32 num_of_hw_cursor;
> +	u32 hw_cursor_w;
> +	u32 hw_cursor_h;
> +	u32 pitch_align;         /* CRTC DMA alignment constraint */
> +	bool has_vblank_counter; /* 32 bit hw vsync counter */
> +
> +	/* device dependent ops, dc side */
> +	const struct lsdc_kms_funcs *funcs;
> +};
> +
> +/* GFX related resources wrangler */
> +
> +struct loongson_gfx_desc {
> +	struct lsdc_desc dc;
> +
> +	u32 conf_reg_base;
> +
> +	/* GFXPLL shared by the DC, GMC and GPU */
> +	struct {
> +		u32 reg_offset;
> +		u32 reg_size;
> +	} gfxpll;
> +
> +	/* Pixel PLL, per display pipe */
> +	struct {
> +		u32 reg_offset;
> +		u32 reg_size;
> +	} pixpll[LSDC_NUM_CRTC];
> +
> +	enum loongson_chip_id chip_id;
> +	char model[64];
> +};
> +
> +static inline const struct loongson_gfx_desc *
> +to_loongson_gfx(const struct lsdc_desc *dcp)
> +{
> +	return container_of_const(dcp, struct loongson_gfx_desc, dc);
> +};
> +
> +struct lsdc_reg32 {
> +	char *name;
> +	u32 offset;
> +};
> +
> +/* crtc hardware related ops */
> +
> +struct lsdc_crtc;
> +
> +struct lsdc_crtc_hw_ops {
> +	void (*enable)(struct lsdc_crtc *lcrtc);
> +	void (*disable)(struct lsdc_crtc *lcrtc);
> +	void (*enable_vblank)(struct lsdc_crtc *lcrtc);
> +	void (*disable_vblank)(struct lsdc_crtc *lcrtc);
> +	void (*flip)(struct lsdc_crtc *lcrtc);
> +	void (*clone)(struct lsdc_crtc *lcrtc);
> +	void (*get_scan_pos)(struct lsdc_crtc *lcrtc, int *hpos, int *vpos);
> +	void (*set_mode)(struct lsdc_crtc *lcrtc, const struct drm_display_mode *mode);
> +	void (*soft_reset)(struct lsdc_crtc *lcrtc);
> +	void (*reset)(struct lsdc_crtc *lcrtc);
> +
> +	u32  (*get_vblank_counter)(struct lsdc_crtc *lcrtc);
> +	void (*set_dma_step)(struct lsdc_crtc *lcrtc, enum lsdc_dma_steps step);
> +};
> +
> +struct lsdc_crtc {
> +	struct drm_crtc base;
> +	struct lsdc_pixpll pixpll;
> +	struct lsdc_device *ldev;
> +	const struct lsdc_crtc_hw_ops *hw_ops;
> +	const struct lsdc_reg32 *preg;
> +	unsigned int nreg;
> +	struct drm_info_list *p_info_list;
> +	unsigned int n_info_list;
> +	bool has_vblank;
> +};
> +
> +/* primary plane hardware related ops */
> +
> +struct lsdc_primary;
> +
> +struct lsdc_primary_plane_ops {
> +	void (*update_fb_addr)(struct lsdc_primary *plane, u64 addr);
> +	void (*update_fb_stride)(struct lsdc_primary *plane, u32 stride);
> +	void (*update_fb_format)(struct lsdc_primary *plane,
> +				 const struct drm_format_info *format);
> +};
> +
> +struct lsdc_primary {
> +	struct drm_plane base;
> +	const struct lsdc_primary_plane_ops *ops;
> +	struct lsdc_device *ldev;
> +};
> +
> +/* cursor plane hardware related ops */
> +
> +struct lsdc_cursor;
> +
> +struct lsdc_cursor_plane_ops {
> +	void (*update_bo_addr)(struct lsdc_cursor *plane, u64 addr);
> +	void (*update_cfg)(struct lsdc_cursor *plane,
> +			   enum lsdc_cursor_size cursor_size,
> +			   enum lsdc_cursor_format);
> +	void (*update_position)(struct lsdc_cursor *plane, int x, int y);
> +};
> +
> +struct lsdc_cursor {
> +	struct drm_plane base;
> +	const struct lsdc_cursor_plane_ops *ops;
> +	struct lsdc_device *ldev;
> +};
> +
> +struct lsdc_output {
> +	struct drm_encoder encoder;
> +	struct drm_connector connector;
> +};
> +
> +static inline struct lsdc_output *
> +connector_to_lsdc_output(struct drm_connector *connector)
> +{
> +	return container_of(connector, struct lsdc_output, connector);
> +}
> +
> +static inline struct lsdc_output *
> +encoder_to_lsdc_output(struct drm_encoder *encoder)
> +{
> +	return container_of(encoder, struct lsdc_output, encoder);
> +}
> +
> +struct lsdc_display_pipe {
> +	struct lsdc_crtc crtc;
> +	struct lsdc_primary primary;
> +	struct lsdc_cursor cursor;
> +	struct lsdc_output output;
> +	struct lsdc_i2c *li2c;
> +	unsigned int index;
> +};
> +
> +static inline struct lsdc_display_pipe *
> +output_to_display_pipe(struct lsdc_output *output)
> +{
> +	return container_of(output, struct lsdc_display_pipe, output);
> +}
> +
> +struct lsdc_kms_funcs {
> +	irqreturn_t (*irq_handler)(int irq, void *arg);
> +
> +	int (*create_i2c)(struct drm_device *ddev,
> +			  struct lsdc_display_pipe *dispipe,
> +			  unsigned int index);
> +
> +	int (*output_init)(struct drm_device *ddev,
> +			   struct lsdc_display_pipe *dispipe,
> +			   struct i2c_adapter *ddc,
> +			   unsigned int index);
> +
> +	int (*cursor_plane_init)(struct drm_device *ddev,
> +				 struct drm_plane *plane,
> +				 unsigned int index);
> +
> +	int (*primary_plane_init)(struct drm_device *ddev,
> +				  struct drm_plane *plane,
> +				  unsigned int index);
> +
> +	int (*crtc_init)(struct drm_device *ddev,
> +			 struct drm_crtc *crtc,
> +			 struct drm_plane *primary,
> +			 struct drm_plane *cursor,
> +			 unsigned int index,
> +			 bool has_vblank);
> +};
> +
> +static inline struct lsdc_crtc *
> +to_lsdc_crtc(struct drm_crtc *crtc)
> +{
> +	return container_of(crtc, struct lsdc_crtc, base);
> +}
> +
> +static inline struct lsdc_display_pipe *
> +crtc_to_display_pipe(struct drm_crtc *crtc)
> +{
> +	return container_of(crtc, struct lsdc_display_pipe, crtc.base);
> +}
> +
> +static inline struct lsdc_primary *
> +to_lsdc_primary(struct drm_plane *plane)
> +{
> +	return container_of(plane, struct lsdc_primary, base);
> +}
> +
> +static inline struct lsdc_cursor *
> +to_lsdc_cursor(struct drm_plane *plane)
> +{
> +	return container_of(plane, struct lsdc_cursor, base);
> +}
> +
> +struct lsdc_crtc_state {
> +	struct drm_crtc_state base;
> +	struct lsdc_pixpll_parms pparms;
> +};
> +
> +struct lsdc_gem {
> +	/* @mutex: protect objects list */
> +	struct mutex mutex;
> +	struct list_head objects;
> +};
> +
> +struct lsdc_device {
> +	struct drm_device base;
> +	struct ttm_device bdev;
> +
> +	/* @descp: features description of the DC variant */
> +	const struct lsdc_desc *descp;
> +	struct pci_dev *dc;
> +	struct pci_dev *gpu;
> +
> +	struct loongson_gfxpll *gfxpll;
> +
> +	/* @reglock: protects concurrent access */
> +	spinlock_t reglock;
> +
> +	void __iomem *reg_base;
> +	resource_size_t vram_base;
> +	resource_size_t vram_size;
> +
> +	resource_size_t gtt_base;
> +	resource_size_t gtt_size;
> +
> +	struct lsdc_display_pipe dispipe[LSDC_NUM_CRTC];
> +
> +	struct lsdc_gem gem;
> +
> +	u32 irq_status;
> +
> +	/* tracking pinned memory */
> +	size_t vram_pinned_size;
> +	size_t gtt_pinned_size;
> +
> +	/* @num_output: count the number of active display pipe */
> +	unsigned int num_output;
> +};
> +
> +static inline struct lsdc_device *tdev_to_ldev(struct ttm_device *bdev)
> +{
> +	return container_of(bdev, struct lsdc_device, bdev);
> +}
> +
> +static inline struct lsdc_device *to_lsdc(struct drm_device *ddev)
> +{
> +	return container_of(ddev, struct lsdc_device, base);
> +}
> +
> +static inline struct lsdc_crtc_state *
> +to_lsdc_crtc_state(struct drm_crtc_state *base)
> +{
> +	return container_of(base, struct lsdc_crtc_state, base);
> +}
> +
> +void lsdc_debugfs_init(struct drm_minor *minor);
> +
> +int ls7a1000_crtc_init(struct drm_device *ddev,
> +		       struct drm_crtc *crtc,
> +		       struct drm_plane *primary,
> +		       struct drm_plane *cursor,
> +		       unsigned int index,
> +		       bool no_vblank);
> +
> +int ls7a2000_crtc_init(struct drm_device *ddev,
> +		       struct drm_crtc *crtc,
> +		       struct drm_plane *primary,
> +		       struct drm_plane *cursor,
> +		       unsigned int index,
> +		       bool no_vblank);
> +
> +int lsdc_primary_plane_init(struct drm_device *ddev,
> +			    struct drm_plane *plane,
> +			    unsigned int index);
> +
> +int ls7a1000_cursor_plane_init(struct drm_device *ddev,
> +			       struct drm_plane *plane,
> +			       unsigned int index);
> +
> +int ls7a2000_cursor_plane_init(struct drm_device *ddev,
> +			       struct drm_plane *plane,
> +			       unsigned int index);
> +
> +/* Registers access helpers */
> +
> +static inline u32 lsdc_rreg32(struct lsdc_device *ldev, u32 offset)
> +{
> +	return readl(ldev->reg_base + offset);
> +}
> +
> +static inline void lsdc_wreg32(struct lsdc_device *ldev, u32 offset, u32 val)
> +{
> +	writel(val, ldev->reg_base + offset);
> +}
> +
> +static inline void lsdc_ureg32_set(struct lsdc_device *ldev,
> +				   u32 offset,
> +				   u32 mask)
> +{
> +	void __iomem *addr = ldev->reg_base + offset;
> +	u32 val = readl(addr);
> +
> +	writel(val | mask, addr);
> +}
> +
> +static inline void lsdc_ureg32_clr(struct lsdc_device *ldev,
> +				   u32 offset,
> +				   u32 mask)
> +{
> +	void __iomem *addr = ldev->reg_base + offset;
> +	u32 val = readl(addr);
> +
> +	writel(val & ~mask, addr);
> +}
> +
> +static inline u32 lsdc_pipe_rreg32(struct lsdc_device *ldev,
> +				   u32 offset, u32 pipe)
> +{
> +	return readl(ldev->reg_base + offset + pipe * CRTC_PIPE_OFFSET);
> +}
> +
> +static inline void lsdc_pipe_wreg32(struct lsdc_device *ldev,
> +				    u32 offset, u32 pipe, u32 val)
> +{
> +	writel(val, ldev->reg_base + offset + pipe * CRTC_PIPE_OFFSET);
> +}
> +
> +#endif
> diff --git a/drivers/gpu/drm/loongson/lsdc_gem.c b/drivers/gpu/drm/loongson/lsdc_gem.c
> new file mode 100644
> index 000000000000..04293df2f0de
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_gem.c
> @@ -0,0 +1,311 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/dma-buf.h>
> +
> +#include <drm/drm_debugfs.h>
> +#include <drm/drm_file.h>
> +#include <drm/drm_gem.h>
> +#include <drm/drm_prime.h>
> +
> +#include "lsdc_drv.h"
> +#include "lsdc_gem.h"
> +#include "lsdc_ttm.h"
> +
> +static int lsdc_gem_prime_pin(struct drm_gem_object *obj)
> +{
> +	struct lsdc_bo *lbo = gem_to_lsdc_bo(obj);
> +	int ret;
> +
> +	ret = lsdc_bo_reserve(lbo);
> +	if (unlikely(ret))
> +		return ret;
> +
> +	ret = lsdc_bo_pin(lbo, LSDC_GEM_DOMAIN_GTT, NULL);
> +	if (likely(ret == 0))
> +		lbo->sharing_count++;
> +
> +	lsdc_bo_unreserve(lbo);
> +
> +	return ret;
> +}
> +
> +static void lsdc_gem_prime_unpin(struct drm_gem_object *obj)
> +{
> +	struct lsdc_bo *lbo = gem_to_lsdc_bo(obj);
> +	int ret;
> +
> +	ret = lsdc_bo_reserve(lbo);
> +	if (unlikely(ret))
> +		return;
> +
> +	lsdc_bo_unpin(lbo);
> +	if (lbo->sharing_count)
> +		lbo->sharing_count--;
> +
> +	lsdc_bo_unreserve(lbo);
> +}
> +
> +static struct sg_table *lsdc_gem_prime_get_sg_table(struct drm_gem_object *obj)
> +{
> +	struct ttm_buffer_object *tbo = to_ttm_bo(obj);
> +	struct ttm_tt *tt = tbo->ttm;
> +
> +	if (!tt) {
> +		drm_err(obj->dev, "sharing a buffer without backing memory\n");
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	return drm_prime_pages_to_sg(obj->dev, tt->pages, tt->num_pages);
> +}
> +
> +static void lsdc_gem_object_free(struct drm_gem_object *obj)
> +{
> +	struct ttm_buffer_object *tbo = to_ttm_bo(obj);
> +
> +	if (tbo)
> +		ttm_bo_put(tbo);
> +}
> +
> +static int lsdc_gem_object_vmap(struct drm_gem_object *obj, struct iosys_map *map)
> +{
> +	struct ttm_buffer_object *tbo = to_ttm_bo(obj);
> +	struct lsdc_bo *lbo = to_lsdc_bo(tbo);
> +	int ret;
> +
> +	if (lbo->vmap_count > 0) {
> +		++lbo->vmap_count;
> +		goto out;
> +	}
> +
> +	ret = lsdc_bo_pin(lbo, 0, NULL);
> +	if (unlikely(ret)) {
> +		drm_err(obj->dev, "pin %p for vmap failed\n", lbo);
> +		return ret;
> +	}
> +
> +	ret = ttm_bo_vmap(tbo, &lbo->map);
> +	if (ret) {
> +		drm_err(obj->dev, "ttm bo vmap failed\n");
> +		lsdc_bo_unpin(lbo);
> +		return ret;
> +	}
> +
> +	lbo->vmap_count = 1;
> +
> +out:
> +	*map = lbo->map;
> +
> +	return 0;
> +}
> +
> +static void lsdc_gem_object_vunmap(struct drm_gem_object *obj, struct iosys_map *map)
> +{
> +	struct ttm_buffer_object *tbo = to_ttm_bo(obj);
> +	struct lsdc_bo *lbo = to_lsdc_bo(tbo);
> +
> +	if (unlikely(!lbo->vmap_count)) {
> +		drm_warn(obj->dev, "%p is not mapped\n", lbo);
> +		return;
> +	}
> +
> +	--lbo->vmap_count;
> +	if (lbo->vmap_count == 0) {
> +		ttm_bo_vunmap(tbo, &lbo->map);
> +
> +		lsdc_bo_unpin(lbo);
> +	}
> +}
> +
> +static int lsdc_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
> +{
> +	struct ttm_buffer_object *tbo = to_ttm_bo(obj);
> +	int ret;
> +
> +	ret = ttm_bo_mmap_obj(vma, tbo);
> +	if (unlikely(ret)) {
> +		drm_warn(obj->dev, "mmap %p failed\n", tbo);
> +		return ret;
> +	}
> +
> +	drm_gem_object_put(obj);
> +
> +	return 0;
> +}
> +
> +static const struct drm_gem_object_funcs lsdc_gem_object_funcs = {
> +	.free = lsdc_gem_object_free,
> +	.export = drm_gem_prime_export,
> +	.pin = lsdc_gem_prime_pin,
> +	.unpin = lsdc_gem_prime_unpin,
> +	.get_sg_table = lsdc_gem_prime_get_sg_table,
> +	.vmap = lsdc_gem_object_vmap,
> +	.vunmap = lsdc_gem_object_vunmap,
> +	.mmap = lsdc_gem_object_mmap,
> +};
> +
> +struct drm_gem_object *lsdc_gem_object_create(struct drm_device *ddev,
> +					      u32 domain,
> +					      size_t size,
> +					      bool kerenl,
> +					      struct sg_table *sg,
> +					      struct dma_resv *resv)
> +{
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	struct drm_gem_object *gobj;
> +	struct lsdc_bo *lbo;
> +	int ret;
> +
> +	lbo = lsdc_bo_create(ddev, domain, size, kerenl, sg, resv);
> +	if (IS_ERR(lbo)) {
> +		ret = PTR_ERR(lbo);
> +		return ERR_PTR(ret);
> +	}
> +
> +	if (!sg) {
> +		/* VRAM is filled with random data */
> +		lsdc_bo_clear(lbo);
> +	}
> +
> +	gobj = &lbo->tbo.base;
> +	gobj->funcs = &lsdc_gem_object_funcs;
> +
> +	/* tracking the BOs we created */
> +	mutex_lock(&ldev->gem.mutex);
> +	list_add_tail(&lbo->list, &ldev->gem.objects);
> +	mutex_unlock(&ldev->gem.mutex);
> +
> +	return gobj;
> +}
> +
> +struct drm_gem_object *
> +lsdc_prime_import_sg_table(struct drm_device *ddev,
> +			   struct dma_buf_attachment *attach,
> +			   struct sg_table *sg)
> +{
> +	struct dma_resv *resv = attach->dmabuf->resv;
> +	u64 size = attach->dmabuf->size;
> +	struct drm_gem_object *gobj;
> +	struct lsdc_bo *lbo;
> +
> +	dma_resv_lock(resv, NULL);
> +	gobj = lsdc_gem_object_create(ddev, LSDC_GEM_DOMAIN_GTT, size, false,
> +				      sg, resv);
> +	dma_resv_unlock(resv);
> +
> +	if (IS_ERR(gobj)) {
> +		drm_err(ddev, "Failed to import sg table\n");
> +		return gobj;
> +	}
> +
> +	lbo = gem_to_lsdc_bo(gobj);
> +	lbo->sharing_count = 1;
> +
> +	return gobj;
> +}
> +
> +int lsdc_dumb_create(struct drm_file *file, struct drm_device *ddev,
> +		     struct drm_mode_create_dumb *args)
> +{
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	const struct lsdc_desc *descp = ldev->descp;
> +	u32 domain = LSDC_GEM_DOMAIN_VRAM;
> +	struct drm_gem_object *gobj;
> +	size_t size;
> +	u32 pitch;
> +	u32 handle;
> +	int ret;
> +
> +	if (!args->width || !args->height)
> +		return -EINVAL;
> +
> +	if (args->bpp != 32 && args->bpp != 16)
> +		return -EINVAL;
> +
> +	pitch = args->width * args->bpp / 8;
> +	pitch = ALIGN(pitch, descp->pitch_align);
> +	size = pitch * args->height;
> +	size = ALIGN(size, PAGE_SIZE);
> +
> +	/* Maximum single bo size allowed is the half vram size available */
> +	if (size > ldev->vram_size / 2) {
> +		drm_err(ddev, "Requesting(%zuMiB) failed\n", size >> 20);
> +		return -ENOMEM;
> +	}
> +
> +	gobj = lsdc_gem_object_create(ddev, domain, size, false, NULL, NULL);
> +	if (IS_ERR(gobj)) {
> +		drm_err(ddev, "Failed to create gem object\n");
> +		return PTR_ERR(gobj);
> +	}
> +
> +	ret = drm_gem_handle_create(file, gobj, &handle);
> +
> +	/* drop reference from allocate, handle holds it now */
> +	drm_gem_object_put(gobj);
> +	if (ret)
> +		return ret;
> +
> +	args->pitch = pitch;
> +	args->size = size;
> +	args->handle = handle;
> +
> +	return 0;
> +}
> +
> +int lsdc_dumb_map_offset(struct drm_file *filp, struct drm_device *ddev,
> +			 u32 handle, uint64_t *offset)
> +{
> +	struct drm_gem_object *gobj;
> +
> +	gobj = drm_gem_object_lookup(filp, handle);
> +	if (!gobj)
> +		return -ENOENT;
> +
> +	*offset = drm_vma_node_offset_addr(&gobj->vma_node);
> +
> +	drm_gem_object_put(gobj);
> +
> +	return 0;
> +}
> +
> +void lsdc_gem_init(struct drm_device *ddev)
> +{
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +
> +	mutex_init(&ldev->gem.mutex);
> +	INIT_LIST_HEAD(&ldev->gem.objects);
> +}
> +
> +int lsdc_show_buffer_object(struct seq_file *m, void *arg)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *)m->private;
> +	struct drm_device *ddev = node->minor->dev;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	struct lsdc_bo *lbo;
> +	unsigned int i;
> +
> +	mutex_lock(&ldev->gem.mutex);
> +
> +	i = 0;
> +
> +	list_for_each_entry(lbo, &ldev->gem.objects, list) {
> +		struct ttm_buffer_object *tbo = &lbo->tbo;
> +		struct ttm_resource *resource = tbo->resource;
> +
> +		seq_printf(m, "bo[%04u][%p]: size: %8zuKiB %s offset: %8llx\n",
> +			   i, lbo, lsdc_bo_size(lbo) >> 10,
> +			   lsdc_mem_type_to_str(resource->mem_type),
> +			   lsdc_bo_gpu_offset(lbo));
> +		i++;
> +	}
> +
> +	mutex_unlock(&ldev->gem.mutex);
> +
> +	seq_printf(m, "Pinned BO size: VRAM: %zuKiB, GTT: %zu KiB\n",
> +		   ldev->vram_pinned_size >> 10, ldev->gtt_pinned_size >> 10);
> +
> +	return 0;
> +}
> diff --git a/drivers/gpu/drm/loongson/lsdc_gem.h b/drivers/gpu/drm/loongson/lsdc_gem.h
> new file mode 100644
> index 000000000000..92cbb10e6e13
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_gem.h
> @@ -0,0 +1,37 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LSDC_GEM_H__
> +#define __LSDC_GEM_H__
> +
> +#include <drm/drm_device.h>
> +#include <drm/drm_gem.h>
> +
> +struct drm_gem_object *
> +lsdc_prime_import_sg_table(struct drm_device *ddev,
> +			   struct dma_buf_attachment *attach,
> +			   struct sg_table *sg);
> +
> +int lsdc_dumb_map_offset(struct drm_file *file,
> +			 struct drm_device *dev,
> +			 u32 handle,
> +			 uint64_t *offset);
> +
> +int lsdc_dumb_create(struct drm_file *file,
> +		     struct drm_device *ddev,
> +		     struct drm_mode_create_dumb *args);
> +
> +void lsdc_gem_init(struct drm_device *ddev);
> +int lsdc_show_buffer_object(struct seq_file *m, void *arg);
> +
> +struct drm_gem_object *
> +lsdc_gem_object_create(struct drm_device *ddev,
> +		       u32 domain,
> +		       size_t size,
> +		       bool kerenl,
> +		       struct sg_table *sg,
> +		       struct dma_resv *resv);
> +
> +#endif
> diff --git a/drivers/gpu/drm/loongson/lsdc_gfxpll.c b/drivers/gpu/drm/loongson/lsdc_gfxpll.c
> new file mode 100644
> index 000000000000..249c09d703ad
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_gfxpll.c
> @@ -0,0 +1,199 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/delay.h>
> +
> +#include <drm/drm_file.h>
> +#include <drm/drm_managed.h>
> +#include <drm/drm_print.h>
> +
> +#include "lsdc_drv.h"
> +
> +/*
> + * GFX PLL is the PLL used by DC, GMC and GPU, the structure of the GFX PLL
> + * may suffer from change across chip variants.
> + *
> + *
> + *                                            +-------------+  sel_out_dc
> + *                                       +----| / div_out_0 | _____/ _____ DC
> + *                                       |    +-------------+
> + * refclk   +---------+      +-------+   |    +-------------+  sel_out_gmc
> + * ---+---> | div_ref | ---> | loopc | --+--> | / div_out_1 | _____/ _____ GMC
> + *    |     +---------+      +-------+   |    +-------------+
> + *    |          /               *       |    +-------------+  sel_out_gpu
> + *    |                                  +----| / div_out_2 | _____/ _____ GPU
> + *    |                                       +-------------+
> + *    |                                                         ^
> + *    |                                                         |
> + *    +--------------------------- bypass ----------------------+
> + */
> +
> +struct loongson_gfxpll_bitmap {
> +	/* Byte 0 ~ Byte 3 */
> +	unsigned div_out_dc    : 7;  /*  6 : 0    DC output clock divider  */
> +	unsigned div_out_gmc   : 7;  /* 13 : 7    GMC output clock divider */
> +	unsigned div_out_gpu   : 7;  /* 20 : 14   GPU output clock divider */
> +	unsigned loopc         : 9;  /* 29 : 21   clock multiplier         */
> +	unsigned _reserved_1_  : 2;  /* 31 : 30                            */
> +
> +	/* Byte 4 ~ Byte 7 */
> +	unsigned div_ref       : 7;   /* 38 : 32   Input clock divider    */
> +	unsigned locked        : 1;   /* 39        PLL locked indicator   */
> +	unsigned sel_out_dc    : 1;   /* 40        dc output clk enable   */
> +	unsigned sel_out_gmc   : 1;   /* 41        gmc output clk enable  */
> +	unsigned sel_out_gpu   : 1;   /* 42        gpu output clk enable  */
> +	unsigned set_param     : 1;   /* 43        Trigger the update     */
> +	unsigned bypass        : 1;   /* 44                               */
> +	unsigned powerdown     : 1;   /* 45                               */
> +	unsigned _reserved_2_  : 18;  /* 46 : 63   no use                 */
> +};
> +
> +union loongson_gfxpll_reg_bitmap {
> +	struct loongson_gfxpll_bitmap bitmap;
> +	u32 w[2];
> +	u64 d;
> +};
> +
> +static void __gfxpll_rreg(struct loongson_gfxpll *this,
> +			  union loongson_gfxpll_reg_bitmap *reg)
> +{
> +#if defined(CONFIG_64BIT)
> +	reg->d = readq(this->mmio);
> +#else
> +	reg->w[0] = readl(this->mmio);
> +	reg->w[1] = readl(this->mmio + 4);
> +#endif
> +}
> +
> +/* Update new parameters to the hardware */
> +
> +static int loongson_gfxpll_update(struct loongson_gfxpll * const this,
> +				  struct loongson_gfxpll_parms const *pin)
> +{
> +	/* None, TODO */
> +
> +	return 0;
> +}
> +
> +static void loongson_gfxpll_get_rates(struct loongson_gfxpll * const this,
> +				      unsigned int *dc,
> +				      unsigned int *gmc,
> +				      unsigned int *gpu)
> +{
> +	struct loongson_gfxpll_parms *pparms = &this->parms;
> +	union loongson_gfxpll_reg_bitmap gfxpll_reg;
> +	unsigned int pre_output;
> +	unsigned int dc_mhz;
> +	unsigned int gmc_mhz;
> +	unsigned int gpu_mhz;
> +
> +	__gfxpll_rreg(this, &gfxpll_reg);
> +
> +	pparms->div_ref = gfxpll_reg.bitmap.div_ref;
> +	pparms->loopc = gfxpll_reg.bitmap.loopc;
> +
> +	pparms->div_out_dc = gfxpll_reg.bitmap.div_out_dc;
> +	pparms->div_out_gmc = gfxpll_reg.bitmap.div_out_gmc;
> +	pparms->div_out_gpu = gfxpll_reg.bitmap.div_out_gpu;
> +
> +	pre_output = pparms->ref_clock / pparms->div_ref * pparms->loopc;
> +
> +	dc_mhz = pre_output / pparms->div_out_dc / 1000;
> +	gmc_mhz = pre_output / pparms->div_out_gmc / 1000;
> +	gpu_mhz = pre_output / pparms->div_out_gpu / 1000;
> +
> +	if (dc)
> +		*dc = dc_mhz;
> +
> +	if (gmc)
> +		*gmc = gmc_mhz;
> +
> +	if (gpu)
> +		*gpu = gpu_mhz;
> +}
> +
> +static void loongson_gfxpll_print(struct loongson_gfxpll * const this,
> +				  struct drm_printer *p,
> +				  bool verbose)
> +{
> +	struct loongson_gfxpll_parms *parms = &this->parms;
> +	unsigned int dc, gmc, gpu;
> +
> +	if (verbose) {
> +		drm_printf(p, "reference clock: %u\n", parms->ref_clock);
> +		drm_printf(p, "div_ref = %u\n", parms->div_ref);
> +		drm_printf(p, "loopc = %u\n", parms->loopc);
> +
> +		drm_printf(p, "div_out_dc = %u\n", parms->div_out_dc);
> +		drm_printf(p, "div_out_gmc = %u\n", parms->div_out_gmc);
> +		drm_printf(p, "div_out_gpu = %u\n", parms->div_out_gpu);
> +	}
> +
> +	this->funcs->get_rates(this, &dc, &gmc, &gpu);
> +
> +	drm_printf(p, "dc: %uMHz, gmc: %uMHz, gpu: %uMHz\n", dc, gmc, gpu);
> +}
> +
> +/* GFX (DC, GPU, GMC) PLL initialization and destroy function */
> +
> +static void loongson_gfxpll_fini(struct drm_device *ddev, void *data)
> +{
> +	struct loongson_gfxpll *this = (struct loongson_gfxpll *)data;
> +
> +	iounmap(this->mmio);
> +
> +	kfree(this);
> +}
> +
> +static int loongson_gfxpll_init(struct loongson_gfxpll * const this)
> +{
> +	struct loongson_gfxpll_parms *pparms = &this->parms;
> +	struct drm_printer printer = drm_info_printer(this->ddev->dev);
> +
> +	pparms->ref_clock = LSDC_PLL_REF_CLK_KHZ;
> +
> +	this->mmio = ioremap(this->reg_base, this->reg_size);
> +	if (IS_ERR_OR_NULL(this->mmio))
> +		return -ENOMEM;
> +
> +	this->funcs->print(this, &printer, false);
> +
> +	return 0;
> +}
> +
> +static const struct loongson_gfxpll_funcs lsdc_gmc_gpu_funcs = {
> +	.init = loongson_gfxpll_init,
> +	.update = loongson_gfxpll_update,
> +	.get_rates = loongson_gfxpll_get_rates,
> +	.print = loongson_gfxpll_print,
> +};
> +
> +int loongson_gfxpll_create(struct drm_device *ddev,
> +			   struct loongson_gfxpll **ppout)
> +{
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	const struct loongson_gfx_desc *gfx = to_loongson_gfx(ldev->descp);
> +	struct loongson_gfxpll *this;
> +	int ret;
> +
> +	this = kzalloc(sizeof(*this), GFP_KERNEL);
> +	if (IS_ERR_OR_NULL(this))
> +		return -ENOMEM;
> +
> +	this->ddev = ddev;
> +	this->reg_size = gfx->gfxpll.reg_size;
> +	this->reg_base = gfx->conf_reg_base + gfx->gfxpll.reg_offset;
> +	this->funcs = &lsdc_gmc_gpu_funcs;
> +
> +	ret = this->funcs->init(this);
> +	if (unlikely(ret)) {
> +		kfree(this);
> +		return ret;
> +	}
> +
> +	*ppout = this;
> +
> +	return drmm_add_action_or_reset(ddev, loongson_gfxpll_fini, this);
> +}
> diff --git a/drivers/gpu/drm/loongson/lsdc_gfxpll.h b/drivers/gpu/drm/loongson/lsdc_gfxpll.h
> new file mode 100644
> index 000000000000..9d59cbfc145d
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_gfxpll.h
> @@ -0,0 +1,52 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LSDC_GFXPLL_H__
> +#define __LSDC_GFXPLL_H__
> +
> +#include <drm/drm_device.h>
> +
> +struct loongson_gfxpll;
> +
> +struct loongson_gfxpll_parms {
> +	unsigned int ref_clock;
> +	unsigned int div_ref;
> +	unsigned int loopc;
> +	unsigned int div_out_dc;
> +	unsigned int div_out_gmc;
> +	unsigned int div_out_gpu;
> +};
> +
> +struct loongson_gfxpll_funcs {
> +	int (*init)(struct loongson_gfxpll * const this);
> +
> +	int (*update)(struct loongson_gfxpll * const this,
> +		      struct loongson_gfxpll_parms const *pin);
> +
> +	void (*get_rates)(struct loongson_gfxpll * const this,
> +			  unsigned int *dc, unsigned int *gmc, unsigned int *gpu);
> +
> +	void (*print)(struct loongson_gfxpll * const this,
> +		      struct drm_printer *printer, bool verbose);
> +};
> +
> +struct loongson_gfxpll {
> +	struct drm_device *ddev;
> +	void __iomem *mmio;
> +
> +	/* PLL register offset */
> +	u32 reg_base;
> +	/* PLL register size in bytes */
> +	u32 reg_size;
> +
> +	const struct loongson_gfxpll_funcs *funcs;
> +
> +	struct loongson_gfxpll_parms parms;
> +};
> +
> +int loongson_gfxpll_create(struct drm_device *ddev,
> +			   struct loongson_gfxpll **ppout);
> +
> +#endif
> diff --git a/drivers/gpu/drm/loongson/lsdc_i2c.c b/drivers/gpu/drm/loongson/lsdc_i2c.c
> new file mode 100644
> index 000000000000..9625d0b1d0b4
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_i2c.c
> @@ -0,0 +1,179 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <drm/drm_managed.h>
> +
> +#include "lsdc_drv.h"
> +#include "lsdc_output.h"
> +
> +/*
> + * __lsdc_gpio_i2c_set - set the state of a gpio pin indicated by mask
> + * @mask: gpio pin mask
> + * @state: "0" for low, "1" for high
> + */
> +static void __lsdc_gpio_i2c_set(struct lsdc_i2c * const li2c, int mask, int state)
> +{
> +	struct lsdc_device *ldev = to_lsdc(li2c->ddev);
> +	unsigned long flags;
> +	u8 val;
> +
> +	spin_lock_irqsave(&ldev->reglock, flags);
> +
> +	if (state) {
> +		/*
> +		 * Setting this pin as input directly, write 1 for input.
> +		 * The external pull-up resistor will pull the level up
> +		 */
> +		val = readb(li2c->dir_reg);
> +		val |= mask;
> +		writeb(val, li2c->dir_reg);
> +	} else {
> +		/* First set this pin as output, write 0 for output */
> +		val = readb(li2c->dir_reg);
> +		val &= ~mask;
> +		writeb(val, li2c->dir_reg);
> +
> +		/* Then, make this pin output 0 */
> +		val = readb(li2c->dat_reg);
> +		val &= ~mask;
> +		writeb(val, li2c->dat_reg);
> +	}
> +
> +	spin_unlock_irqrestore(&ldev->reglock, flags);
> +}
> +
> +/*
> + * __lsdc_gpio_i2c_get - read value back from the gpio pin indicated by mask
> + * @mask: gpio pin mask
> + * return "0" for low, "1" for high
> + */
> +static int __lsdc_gpio_i2c_get(struct lsdc_i2c * const li2c, int mask)
> +{
> +	struct lsdc_device *ldev = to_lsdc(li2c->ddev);
> +	unsigned long flags;
> +	u8 val;
> +
> +	spin_lock_irqsave(&ldev->reglock, flags);
> +
> +	/* First set this pin as input */
> +	val = readb(li2c->dir_reg);
> +	val |= mask;
> +	writeb(val, li2c->dir_reg);
> +
> +	/* Then get level state from this pin */
> +	val = readb(li2c->dat_reg);
> +
> +	spin_unlock_irqrestore(&ldev->reglock, flags);
> +
> +	return (val & mask) ? 1 : 0;
> +}
> +
> +static void lsdc_gpio_i2c_set_sda(void *i2c, int state)
> +{
> +	struct lsdc_i2c * const li2c = (struct lsdc_i2c *)i2c;
> +	/* set state on the li2c->sda pin */
> +	return __lsdc_gpio_i2c_set(li2c, li2c->sda, state);
> +}
> +
> +static void lsdc_gpio_i2c_set_scl(void *i2c, int state)
> +{
> +	struct lsdc_i2c * const li2c = (struct lsdc_i2c *)i2c;
> +	/* set state on the li2c->scl pin */
> +	return __lsdc_gpio_i2c_set(li2c, li2c->scl, state);
> +}
> +
> +static int lsdc_gpio_i2c_get_sda(void *i2c)
> +{
> +	struct lsdc_i2c * const li2c = (struct lsdc_i2c *)i2c;
> +	/* read value from the li2c->sda pin */
> +	return __lsdc_gpio_i2c_get(li2c, li2c->sda);
> +}
> +
> +static int lsdc_gpio_i2c_get_scl(void *i2c)
> +{
> +	struct lsdc_i2c * const li2c = (struct lsdc_i2c *)i2c;
> +	/* read the value from the li2c->scl pin */
> +	return __lsdc_gpio_i2c_get(li2c, li2c->scl);
> +}
> +
> +static void lsdc_destroy_i2c(struct drm_device *ddev, void *data)
> +{
> +	struct lsdc_i2c *li2c = (struct lsdc_i2c *)data;
> +
> +	if (li2c) {
> +		i2c_del_adapter(&li2c->adapter);
> +		kfree(li2c);
> +	}
> +}
> +
> +/*
> + * The DC in ls7a1000/ls7a2000/ls2k2000 has builtin gpio hardware
> + *
> + * @reg_base: gpio reg base
> + * @index: output channel index, 0 for PIPE0, 1 for PIPE1
> + */
> +int lsdc_create_i2c_chan(struct drm_device *ddev,
> +			 struct lsdc_display_pipe *dispipe,
> +			 unsigned int index)
> +{
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	struct i2c_adapter *adapter;
> +	struct lsdc_i2c *li2c;
> +	int ret;
> +
> +	li2c = kzalloc(sizeof(*li2c), GFP_KERNEL);
> +	if (!li2c)
> +		return -ENOMEM;
> +
> +	dispipe->li2c = li2c;
> +
> +	if (index == 0) {
> +		li2c->sda = 0x01;  /* pin 0 */
> +		li2c->scl = 0x02;  /* pin 1 */
> +	} else if (index == 1) {
> +		li2c->sda = 0x04;  /* pin 2 */
> +		li2c->scl = 0x08;  /* pin 3 */
> +	} else {
> +		return -ENOENT;
> +	}
> +
> +	li2c->ddev = ddev;
> +	li2c->dir_reg = ldev->reg_base + LS7A_DC_GPIO_DIR_REG;
> +	li2c->dat_reg = ldev->reg_base + LS7A_DC_GPIO_DAT_REG;
> +
> +	li2c->bit.setsda = lsdc_gpio_i2c_set_sda;
> +	li2c->bit.setscl = lsdc_gpio_i2c_set_scl;
> +	li2c->bit.getsda = lsdc_gpio_i2c_get_sda;
> +	li2c->bit.getscl = lsdc_gpio_i2c_get_scl;
> +	li2c->bit.udelay = 5;
> +	li2c->bit.timeout = usecs_to_jiffies(2200);
> +	li2c->bit.data = li2c;
> +
> +	adapter = &li2c->adapter;
> +	adapter->algo_data = &li2c->bit;
> +	adapter->owner = THIS_MODULE;
> +	adapter->class = I2C_CLASS_DDC;
> +	adapter->dev.parent = ddev->dev;
> +	adapter->nr = -1;
> +
> +	snprintf(adapter->name, sizeof(adapter->name), "lsdc-i2c%u", index);
> +
> +	i2c_set_adapdata(adapter, li2c);
> +
> +	ret = i2c_bit_add_bus(adapter);
> +	if (ret) {
> +		kfree(li2c);
> +		return ret;
> +	}
> +
> +	ret = drmm_add_action_or_reset(ddev, lsdc_destroy_i2c, li2c);
> +	if (ret)
> +		return ret;
> +
> +	drm_info(ddev, "%s(sda pin mask=%u, scl pin mask=%u) created\n",
> +		 adapter->name, li2c->sda, li2c->scl);
> +
> +	return 0;
> +}
> diff --git a/drivers/gpu/drm/loongson/lsdc_i2c.h b/drivers/gpu/drm/loongson/lsdc_i2c.h
> new file mode 100644
> index 000000000000..88cd1a1817a5
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_i2c.h
> @@ -0,0 +1,29 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LSDC_I2C_H__
> +#define __LSDC_I2C_H__
> +
> +#include <linux/i2c.h>
> +#include <linux/i2c-algo-bit.h>
> +
> +struct lsdc_i2c {
> +	struct i2c_adapter adapter;
> +	struct i2c_algo_bit_data bit;
> +	struct drm_device *ddev;
> +	void __iomem *dir_reg;
> +	void __iomem *dat_reg;
> +	/* pin bit mask */
> +	u8 sda;
> +	u8 scl;
> +};
> +
> +struct lsdc_display_pipe;
> +
> +int lsdc_create_i2c_chan(struct drm_device *ddev,
> +			 struct lsdc_display_pipe *dispipe,
> +			 unsigned int index);
> +
> +#endif
> diff --git a/drivers/gpu/drm/loongson/lsdc_irq.c b/drivers/gpu/drm/loongson/lsdc_irq.c
> new file mode 100644
> index 000000000000..efdc4d10792d
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_irq.c
> @@ -0,0 +1,74 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <drm/drm_vblank.h>
> +
> +#include "lsdc_irq.h"
> +
> +/*
> + * For the DC in LS7A2000, clearing interrupt status is achieved by
> + * write "1" to LSDC_INT_REG.
> + *
> + * For the DC in LS7A1000, clear interrupt status is achieved by write "0"
> + * to LSDC_INT_REG.
> + *
> + * Two different hardware engineers modify it as their will.
> + */
> +
> +irqreturn_t ls7a2000_dc_irq_handler(int irq, void *arg)
> +{
> +	struct drm_device *ddev = arg;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	u32 val;
> +
> +	/* Read the interrupt status */
> +	val = lsdc_rreg32(ldev, LSDC_INT_REG);
> +	if ((val & INT_STATUS_MASK) == 0) {
> +		drm_warn(ddev, "no interrupt occurs\n");
> +		return IRQ_NONE;
> +	}
> +
> +	ldev->irq_status = val;
> +
> +	/* write "1" to clear the interrupt status */
> +	lsdc_wreg32(ldev, LSDC_INT_REG, val);
> +
> +	if (ldev->irq_status & INT_CRTC0_VSYNC)
> +		drm_handle_vblank(ddev, 0);
> +
> +	if (ldev->irq_status & INT_CRTC1_VSYNC)
> +		drm_handle_vblank(ddev, 1);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +/* For the DC in LS7A1000 and LS2K1000 */
> +irqreturn_t ls7a1000_dc_irq_handler(int irq, void *arg)
> +{
> +	struct drm_device *ddev = arg;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	u32 val;
> +
> +	/* Read the interrupt status */
> +	val = lsdc_rreg32(ldev, LSDC_INT_REG);
> +	if ((val & INT_STATUS_MASK) == 0) {
> +		drm_warn(ddev, "no interrupt occurs\n");
> +		return IRQ_NONE;
> +	}
> +
> +	ldev->irq_status = val;
> +
> +	/* write "0" to clear the interrupt status */
> +	val &= ~(INT_CRTC0_VSYNC | INT_CRTC1_VSYNC);
> +	lsdc_wreg32(ldev, LSDC_INT_REG, val);
> +
> +	if (ldev->irq_status & INT_CRTC0_VSYNC)
> +		drm_handle_vblank(ddev, 0);
> +
> +	if (ldev->irq_status & INT_CRTC1_VSYNC)
> +		drm_handle_vblank(ddev, 1);
> +
> +	return IRQ_HANDLED;
> +}
> diff --git a/drivers/gpu/drm/loongson/lsdc_irq.h b/drivers/gpu/drm/loongson/lsdc_irq.h
> new file mode 100644
> index 000000000000..726cb3018b89
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_irq.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LSDC_IRQ_H__
> +#define __LSDC_IRQ_H__
> +
> +#include <linux/irqreturn.h>
> +
> +#include "lsdc_drv.h"
> +
> +irqreturn_t ls7a1000_dc_irq_handler(int irq, void *arg);
> +irqreturn_t ls7a2000_dc_irq_handler(int irq, void *arg);
> +
> +#endif
> diff --git a/drivers/gpu/drm/loongson/lsdc_output.h b/drivers/gpu/drm/loongson/lsdc_output.h
> new file mode 100644
> index 000000000000..097789051a1d
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_output.h
> @@ -0,0 +1,21 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LSDC_OUTPUT_H__
> +#define __LSDC_OUTPUT_H__
> +
> +#include "lsdc_drv.h"
> +
> +int ls7a1000_output_init(struct drm_device *ddev,
> +			 struct lsdc_display_pipe *dispipe,
> +			 struct i2c_adapter *ddc,
> +			 unsigned int index);
> +
> +int ls7a2000_output_init(struct drm_device *ldev,
> +			 struct lsdc_display_pipe *dispipe,
> +			 struct i2c_adapter *ddc,
> +			 unsigned int index);
> +
> +#endif
> diff --git a/drivers/gpu/drm/loongson/lsdc_output_7a1000.c b/drivers/gpu/drm/loongson/lsdc_output_7a1000.c
> new file mode 100644
> index 000000000000..6fc8dd1c7d9a
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_output_7a1000.c
> @@ -0,0 +1,178 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_edid.h>
> +#include <drm/drm_probe_helper.h>
> +
> +#include "lsdc_drv.h"
> +#include "lsdc_output.h"
> +
> +/*
> + * The display controller in the LS7A1000 exports two DVO interfaces, thus
> + * external encoder is required, except connected to the DPI panel directly.
> + *
> + *       ___________________                                     _________
> + *      |            -------|                                   |         |
> + *      |  CRTC0 --> | DVO0 ----> Encoder0 ---> Connector0 ---> | Display |
> + *      |  _   _     -------|        ^             ^            |_________|
> + *      | | | | |  +------+ |        |             |
> + *      | |_| |_|  | i2c6 | <--------+-------------+
> + *      |          +------+ |
> + *      |                   |
> + *      |  DC in LS7A1000   |
> + *      |                   |
> + *      |  _   _   +------+ |
> + *      | | | | |  | i2c7 | <--------+-------------+
> + *      | |_| |_|  +------+ |        |             |             _________
> + *      |            -------|        |             |            |         |
> + *      |  CRTC1 --> | DVO1 ----> Encoder1 ---> Connector1 ---> |  Panel  |
> + *      |            -------|                                   |_________|
> + *      |___________________|
> + *
> + * Currently, we assume the external encoders connected to the DVO are
> + * transparent. Loongson's DVO interface can directly drive RGB888 panels.
> + *
> + *  TODO: Add support for non-transparent encoders
> + */
> +
> +static int ls7a1000_dpi_connector_get_modes(struct drm_connector *conn)
> +{
> +	unsigned int num = 0;
> +	struct edid *edid;
> +
> +	if (conn->ddc) {
> +		edid = drm_get_edid(conn, conn->ddc);
> +		if (edid) {
> +			drm_connector_update_edid_property(conn, edid);
> +			num = drm_add_edid_modes(conn, edid);
> +			kfree(edid);
> +		}
> +
> +		return num;
> +	}
> +
> +	num = drm_add_modes_noedid(conn, 1920, 1200);
> +
> +	drm_set_preferred_mode(conn, 1024, 768);
> +
> +	return num;
> +}
> +
> +static struct drm_encoder *
> +ls7a1000_dpi_connector_get_best_encoder(struct drm_connector *connector,
> +					struct drm_atomic_state *state)
> +{
> +	struct lsdc_output *output = connector_to_lsdc_output(connector);
> +
> +	return &output->encoder;
> +}
> +
> +static const struct drm_connector_helper_funcs
> +ls7a1000_dpi_connector_helpers = {
> +	.atomic_best_encoder = ls7a1000_dpi_connector_get_best_encoder,
> +	.get_modes = ls7a1000_dpi_connector_get_modes,
> +};
> +
> +static enum drm_connector_status
> +ls7a1000_dpi_connector_detect(struct drm_connector *connector, bool force)
> +{
> +	struct i2c_adapter *ddc = connector->ddc;
> +
> +	if (ddc) {
> +		if (drm_probe_ddc(ddc))
> +			return connector_status_connected;
> +
> +		return connector_status_disconnected;
> +	}
> +
> +	return connector_status_unknown;
> +}
> +
> +static const struct drm_connector_funcs ls7a1000_dpi_connector_funcs = {
> +	.detect = ls7a1000_dpi_connector_detect,
> +	.fill_modes = drm_helper_probe_single_connector_modes,
> +	.destroy = drm_connector_cleanup,
> +	.reset = drm_atomic_helper_connector_reset,
> +	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state
> +};
> +
> +static void ls7a1000_pipe0_encoder_reset(struct drm_encoder *encoder)
> +{
> +	struct drm_device *ddev = encoder->dev;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +
> +	/*
> +	 * We need this for S3 support, screen will not lightup if don't set
> +	 * this register correctly.
> +	 */
> +	lsdc_wreg32(ldev, LSDC_CRTC0_DVO_CONF_REG,
> +		    PHY_CLOCK_POL | PHY_CLOCK_EN | PHY_DATA_EN);
> +}
> +
> +static void ls7a1000_pipe1_encoder_reset(struct drm_encoder *encoder)
> +{
> +	struct drm_device *ddev = encoder->dev;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +
> +	/*
> +	 * We need this for S3 support, screen will not lightup if don't set
> +	 * this register correctly.
> +	 */
> +
> +	/* DVO */
> +	lsdc_wreg32(ldev, LSDC_CRTC1_DVO_CONF_REG,
> +		    BIT(31) | PHY_CLOCK_POL | PHY_CLOCK_EN | PHY_DATA_EN);
> +}
> +
> +static const struct drm_encoder_funcs ls7a1000_encoder_funcs[2] = {
> +	{
> +		.reset = ls7a1000_pipe0_encoder_reset,
> +		.destroy = drm_encoder_cleanup,
> +	},
> +	{
> +		.reset = ls7a1000_pipe1_encoder_reset,
> +		.destroy = drm_encoder_cleanup,
> +	},
> +};
> +
> +int ls7a1000_output_init(struct drm_device *ddev,
> +			 struct lsdc_display_pipe *dispipe,
> +			 struct i2c_adapter *ddc,
> +			 unsigned int index)
> +{
> +	struct lsdc_output *output = &dispipe->output;
> +	struct drm_encoder *encoder = &output->encoder;
> +	struct drm_connector *connector = &output->connector;
> +	int ret;
> +
> +	ret = drm_encoder_init(ddev, encoder, &ls7a1000_encoder_funcs[index],
> +			       DRM_MODE_ENCODER_TMDS, "encoder-%u", index);
> +	if (ret)
> +		return ret;
> +
> +	encoder->possible_crtcs = BIT(index);
> +
> +	ret = drm_connector_init_with_ddc(ddev, connector,
> +					  &ls7a1000_dpi_connector_funcs,
> +					  DRM_MODE_CONNECTOR_DPI, ddc);
> +	if (ret)
> +		return ret;
> +
> +	drm_info(ddev, "display pipe-%u has a DVO\n", index);
> +
> +	drm_connector_helper_add(connector, &ls7a1000_dpi_connector_helpers);
> +
> +	drm_connector_attach_encoder(connector, encoder);
> +
> +	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
> +			    DRM_CONNECTOR_POLL_DISCONNECT;
> +
> +	connector->interlace_allowed = 0;
> +	connector->doublescan_allowed = 0;
> +
> +	return 0;
> +}
> diff --git a/drivers/gpu/drm/loongson/lsdc_output_7a2000.c b/drivers/gpu/drm/loongson/lsdc_output_7a2000.c
> new file mode 100644
> index 000000000000..ce3dabec887e
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_output_7a2000.c
> @@ -0,0 +1,552 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/delay.h>
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_debugfs.h>
> +#include <drm/drm_edid.h>
> +#include <drm/drm_probe_helper.h>
> +
> +#include "lsdc_drv.h"
> +#include "lsdc_output.h"
> +
> +/*
> + * The display controller in LS7A2000 has two display pipes
> + * Display pipe 0 is attached with a built-in transparent VGA encoder and
> + * a built-in HDMI encoder.
> + * Display pipe 1 has only one built-in HDMI encoder connected.
> + *       ______________________                          _____________
> + *      |             +-----+  |                        |             |
> + *      | CRTC0 -+--> | VGA |  ----> VGA Connector ---> | VGA Monitor |<---+
> + *      |        |    +-----+  |                        |_____________|    |
> + *      |        |             |                         ______________    |
> + *      |        |    +------+ |                        |              |   |
> + *      |        +--> | HDMI | ----> HDMI Connector --> | HDMI Monitor |<--+
> + *      |             +------+ |                        |______________|   |
> + *      |            +------+  |                                           |
> + *      |            | i2c6 |  <-------------------------------------------+
> + *      |            +------+  |
> + *      |                      |
> + *      |    DC in LS7A2000    |
> + *      |                      |
> + *      |            +------+  |
> + *      |            | i2c7 |  <--------------------------------+
> + *      |            +------+  |                                |
> + *      |                      |                          ______|_______
> + *      |            +------+  |                         |              |
> + *      | CRTC1 ---> | HDMI |  ----> HDMI Connector ---> | HDMI Monitor |
> + *      |            +------+  |                         |______________|
> + *      |______________________|
> + */
> +
> +static int ls7a2000_connector_get_modes(struct drm_connector *connector)
> +{
> +	unsigned int num = 0;
> +	struct edid *edid;
> +
> +	if (connector->ddc) {
> +		edid = drm_get_edid(connector, connector->ddc);
> +		if (edid) {
> +			drm_connector_update_edid_property(connector, edid);
> +			num = drm_add_edid_modes(connector, edid);
> +			kfree(edid);
> +		}
> +
> +		return num;
> +	}
> +
> +	num = drm_add_modes_noedid(connector, 1920, 1200);
> +
> +	drm_set_preferred_mode(connector, 1024, 768);
> +
> +	return num;
> +}
> +
> +static struct drm_encoder *
> +ls7a2000_connector_get_best_encoder(struct drm_connector *connector,
> +				    struct drm_atomic_state *state)
> +{
> +	struct lsdc_output *output = connector_to_lsdc_output(connector);
> +
> +	return &output->encoder;
> +}
> +
> +static const struct drm_connector_helper_funcs ls7a2000_connector_helpers = {
> +	.atomic_best_encoder = ls7a2000_connector_get_best_encoder,
> +	.get_modes = ls7a2000_connector_get_modes,
> +};
> +
> +/* debugfs */
> +
> +#define LSDC_HDMI_REG(i, reg) {                               \
> +	.name = __stringify_1(LSDC_HDMI##i##_##reg##_REG),    \
> +	.offset = LSDC_HDMI##i##_##reg##_REG,                 \
> +}
> +
> +static const struct lsdc_reg32 ls7a2000_hdmi0_encoder_regs[] = {
> +	LSDC_HDMI_REG(0, ZONE),
> +	LSDC_HDMI_REG(0, INTF_CTRL),
> +	LSDC_HDMI_REG(0, PHY_CTRL),
> +	LSDC_HDMI_REG(0, PHY_PLL),
> +	LSDC_HDMI_REG(0, AVI_INFO_CRTL),
> +	LSDC_HDMI_REG(0, PHY_CAL),
> +	LSDC_HDMI_REG(0, AUDIO_PLL_LO),
> +	LSDC_HDMI_REG(0, AUDIO_PLL_HI),
> +	{NULL, 0},  /* MUST be {NULL, 0} terminated */
> +};
> +
> +static const struct lsdc_reg32 ls7a2000_hdmi1_encoder_regs[] = {
> +	LSDC_HDMI_REG(1, ZONE),
> +	LSDC_HDMI_REG(1, INTF_CTRL),
> +	LSDC_HDMI_REG(1, PHY_CTRL),
> +	LSDC_HDMI_REG(1, PHY_PLL),
> +	LSDC_HDMI_REG(1, AVI_INFO_CRTL),
> +	LSDC_HDMI_REG(1, PHY_CAL),
> +	LSDC_HDMI_REG(1, AUDIO_PLL_LO),
> +	LSDC_HDMI_REG(1, AUDIO_PLL_HI),
> +	{NULL, 0},  /* MUST be {NULL, 0} terminated */
> +};
> +
> +static int ls7a2000_hdmi_encoder_regs_show(struct seq_file *m, void *data)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *)m->private;
> +	struct drm_device *ddev = node->minor->dev;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	const struct lsdc_reg32 *preg;
> +
> +	preg = (const struct lsdc_reg32 *)node->info_ent->data;
> +
> +	while (preg->name) {
> +		u32 offset = preg->offset;
> +
> +		seq_printf(m, "%s (0x%04x): 0x%08x\n",
> +			   preg->name, offset, lsdc_rreg32(ldev, offset));
> +		++preg;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct drm_info_list ls7a2000_hdmi0_debugfs_files[] = {
> +	{ "regs", ls7a2000_hdmi_encoder_regs_show, 0, (void *)ls7a2000_hdmi0_encoder_regs },
> +};
> +
> +static const struct drm_info_list ls7a2000_hdmi1_debugfs_files[] = {
> +	{ "regs", ls7a2000_hdmi_encoder_regs_show, 0, (void *)ls7a2000_hdmi1_encoder_regs },
> +};
> +
> +static void ls7a2000_hdmi0_late_register(struct drm_connector *connector,
> +					 struct dentry *root)
> +{
> +	struct drm_device *ddev = connector->dev;
> +	struct drm_minor *minor = ddev->primary;
> +
> +	drm_debugfs_create_files(ls7a2000_hdmi0_debugfs_files,
> +				 ARRAY_SIZE(ls7a2000_hdmi0_debugfs_files),
> +				 root, minor);
> +}
> +
> +static void ls7a2000_hdmi1_late_register(struct drm_connector *connector,
> +					 struct dentry *root)
> +{
> +	struct drm_device *ddev = connector->dev;
> +	struct drm_minor *minor = ddev->primary;
> +
> +	drm_debugfs_create_files(ls7a2000_hdmi1_debugfs_files,
> +				 ARRAY_SIZE(ls7a2000_hdmi1_debugfs_files),
> +				 root, minor);
> +}
> +
> +/* monitor present detection */
> +
> +static enum drm_connector_status
> +ls7a2000_hdmi0_vga_connector_detect(struct drm_connector *connector, bool force)
> +{
> +	struct drm_device *ddev = connector->dev;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	u32 val;
> +
> +	val = lsdc_rreg32(ldev, LSDC_HDMI_HPD_STATUS_REG);
> +
> +	if (val & HDMI0_HPD_FLAG)
> +		return connector_status_connected;
> +
> +	if (connector->ddc) {
> +		if (drm_probe_ddc(connector->ddc))
> +			return connector_status_connected;
> +
> +		return connector_status_disconnected;
> +	}
> +
> +	return connector_status_unknown;
> +}
> +
> +static enum drm_connector_status
> +ls7a2000_hdmi1_connector_detect(struct drm_connector *connector, bool force)
> +{
> +	struct lsdc_device *ldev = to_lsdc(connector->dev);
> +	u32 val;
> +
> +	val = lsdc_rreg32(ldev, LSDC_HDMI_HPD_STATUS_REG);
> +
> +	if (val & HDMI1_HPD_FLAG)
> +		return connector_status_connected;
> +
> +	return connector_status_disconnected;
> +}
> +
> +static const struct drm_connector_funcs ls7a2000_hdmi_connector_funcs[2] = {
> +	{
> +		.detect = ls7a2000_hdmi0_vga_connector_detect,
> +		.fill_modes = drm_helper_probe_single_connector_modes,
> +		.destroy = drm_connector_cleanup,
> +		.reset = drm_atomic_helper_connector_reset,
> +		.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> +		.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +		.debugfs_init = ls7a2000_hdmi0_late_register,
> +	},
> +	{
> +		.detect = ls7a2000_hdmi1_connector_detect,
> +		.fill_modes = drm_helper_probe_single_connector_modes,
> +		.destroy = drm_connector_cleanup,
> +		.reset = drm_atomic_helper_connector_reset,
> +		.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> +		.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +		.debugfs_init = ls7a2000_hdmi1_late_register,
> +	},
> +};
> +
> +/* Even though some board has only one hdmi on display pipe 1,
> + * We still need hook lsdc_encoder_funcs up on display pipe 0,
> + * This is because we need its reset() callback get called, to
> + * set the LSDC_HDMIx_CTRL_REG using software gpio emulated i2c.
> + * Otherwise, the firmware may set LSDC_HDMIx_CTRL_REG blindly.
> + */
> +static void ls7a2000_hdmi0_encoder_reset(struct drm_encoder *encoder)
> +{
> +	struct drm_device *ddev = encoder->dev;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	u32 val;
> +
> +	val = PHY_CLOCK_POL | PHY_CLOCK_EN | PHY_DATA_EN;
> +	lsdc_wreg32(ldev, LSDC_CRTC0_DVO_CONF_REG, val);
> +
> +	/* using software gpio emulated i2c */
> +	val = lsdc_rreg32(ldev, LSDC_HDMI0_INTF_CTRL_REG);
> +	val &= ~HW_I2C_EN;
> +	lsdc_wreg32(ldev, LSDC_HDMI0_INTF_CTRL_REG, val);
> +
> +	/* help the hdmi phy to get out of reset state */
> +	lsdc_wreg32(ldev, LSDC_HDMI0_PHY_CTRL_REG, HDMI_PHY_RESET_N);
> +
> +	mdelay(20);
> +
> +	drm_dbg(ddev, "HDMI-0 Reset\n");
> +}
> +
> +static void ls7a2000_hdmi1_encoder_reset(struct drm_encoder *encoder)
> +{
> +	struct drm_device *ddev = encoder->dev;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	u32 val;
> +
> +	val = PHY_CLOCK_POL | PHY_CLOCK_EN | PHY_DATA_EN;
> +	lsdc_wreg32(ldev, LSDC_CRTC1_DVO_CONF_REG, val);
> +
> +	/* using software gpio emulated i2c */
> +	val = lsdc_rreg32(ldev, LSDC_HDMI1_INTF_CTRL_REG);
> +	val &= ~HW_I2C_EN;
> +	lsdc_wreg32(ldev, LSDC_HDMI1_INTF_CTRL_REG, val);
> +
> +	/*  help the hdmi phy to get out of reset state */
> +	lsdc_wreg32(ldev, LSDC_HDMI1_PHY_CTRL_REG, HDMI_PHY_RESET_N);
> +
> +	mdelay(20);
> +
> +	drm_dbg(ddev, "HDMI-1 Reset\n");
> +}
> +
> +static const struct drm_encoder_funcs ls7a2000_encoder_funcs[2] = {
> +	{
> +		.reset = ls7a2000_hdmi0_encoder_reset,
> +		.destroy = drm_encoder_cleanup,
> +	},
> +	{
> +		.reset = ls7a2000_hdmi1_encoder_reset,
> +		.destroy = drm_encoder_cleanup,
> +	},
> +};
> +
> +static int ls7a2000_hdmi_set_avi_infoframe(struct drm_encoder *encoder,
> +					   struct drm_display_mode *mode)
> +{
> +	struct lsdc_output *output = encoder_to_lsdc_output(encoder);
> +	struct lsdc_display_pipe *dispipe = output_to_display_pipe(output);
> +	unsigned int index = dispipe->index;
> +	struct drm_device *ddev = encoder->dev;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	struct hdmi_avi_infoframe infoframe;
> +	u8 buffer[HDMI_INFOFRAME_SIZE(AVI)];
> +	unsigned char *ptr = &buffer[HDMI_INFOFRAME_HEADER_SIZE];
> +	unsigned int content0, content1, content2, content3;
> +	int err;
> +
> +	err = drm_hdmi_avi_infoframe_from_display_mode(&infoframe,
> +						       &output->connector,
> +						       mode);
> +	if (err < 0) {
> +		drm_err(ddev, "failed to setup AVI infoframe: %d\n", err);
> +		return err;
> +	}
> +
> +	/* Fixed infoframe configuration not linked to the mode */
> +	infoframe.colorspace = HDMI_COLORSPACE_RGB;
> +	infoframe.quantization_range = HDMI_QUANTIZATION_RANGE_DEFAULT;
> +	infoframe.colorimetry = HDMI_COLORIMETRY_NONE;
> +
> +	err = hdmi_avi_infoframe_pack(&infoframe, buffer, sizeof(buffer));
> +	if (err < 0) {
> +		drm_err(ddev, "failed to pack AVI infoframe: %d\n", err);
> +			return err;
> +	}
> +
> +	content0 = *(unsigned int *)ptr;
> +	content1 = *(ptr + 4);
> +	content2 = *(unsigned int *)(ptr + 5);
> +	content3 = *(unsigned int *)(ptr + 9);
> +
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_AVI_CONTENT0, index, content0);
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_AVI_CONTENT1, index, content1);
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_AVI_CONTENT2, index, content2);
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_AVI_CONTENT3, index, content3);
> +
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_AVI_INFO_CRTL_REG, index,
> +			 AVI_PKT_ENABLE | AVI_PKT_UPDATE);
> +
> +	drm_dbg(ddev, "Update HDMI-%u avi infoframe\n", index);
> +
> +	return 0;
> +}
> +
> +static void ls7a2000_hdmi_atomic_disable(struct drm_encoder *encoder,
> +					 struct drm_atomic_state *state)
> +{
> +	struct lsdc_output *output = encoder_to_lsdc_output(encoder);
> +	struct lsdc_display_pipe *dispipe = output_to_display_pipe(output);
> +	unsigned int index = dispipe->index;
> +	struct drm_device *ddev = encoder->dev;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	u32 val;
> +
> +	/* Disable the hdmi phy */
> +	val = lsdc_pipe_rreg32(ldev, LSDC_HDMI0_PHY_CTRL_REG, index);
> +	val &= ~HDMI_PHY_EN;
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_PHY_CTRL_REG, index, val);
> +
> +	/* Disable the hdmi interface */
> +	val = lsdc_pipe_rreg32(ldev, LSDC_HDMI0_INTF_CTRL_REG, index);
> +	val &= ~HDMI_INTERFACE_EN;
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_INTF_CTRL_REG, index, val);
> +
> +	drm_dbg(ddev, "HDMI-%u disabled\n", index);
> +}
> +
> +static void ls7a2000_hdmi_atomic_enable(struct drm_encoder *encoder,
> +					struct drm_atomic_state *state)
> +{
> +	struct drm_device *ddev = encoder->dev;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	struct lsdc_output *output = encoder_to_lsdc_output(encoder);
> +	struct lsdc_display_pipe *dispipe = output_to_display_pipe(output);
> +	unsigned int index = dispipe->index;
> +	u32 val;
> +
> +	/* datasheet say it should larger than 48 */
> +	val = 64 << HDMI_H_ZONE_IDLE_SHIFT | 64 << HDMI_V_ZONE_IDLE_SHIFT;
> +
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_ZONE_REG, index, val);
> +
> +	val = HDMI_PHY_TERM_STATUS |
> +	      HDMI_PHY_TERM_DET_EN |
> +	      HDMI_PHY_TERM_H_EN |
> +	      HDMI_PHY_TERM_L_EN |
> +	      HDMI_PHY_RESET_N |
> +	      HDMI_PHY_EN;
> +
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_PHY_CTRL_REG, index, val);
> +
> +	udelay(2);
> +
> +	val = HDMI_CTL_PERIOD_MODE |
> +	      HDMI_AUDIO_EN |
> +	      HDMI_PACKET_EN |
> +	      HDMI_INTERFACE_EN |
> +	      (8 << HDMI_VIDEO_PREAMBLE_SHIFT);
> +
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_INTF_CTRL_REG, index, val);
> +
> +	drm_dbg(ddev, "HDMI-%u enabled\n", index);
> +}
> +
> +/*
> + *  Fout = M * Fin
> + *
> + *  M = (4 * LF) / (IDF * ODF)
> + *
> + *  IDF: Input Division Factor
> + *  ODF: Output Division Factor
> + *   LF: Loop Factor
> + *    M: Required Mult
> + *
> + *  +--------------------------------------------------------+
> + *  |     Fin (kHZ)     | M  | IDF | LF | ODF |   Fout(Mhz)  |
> + *  |-------------------+----+-----+----+-----+--------------|
> + *  |  170000 ~ 340000  | 10 | 16  | 40 |  1  | 1700 ~ 3400  |
> + *  |   85000 ~ 170000  | 10 |  8  | 40 |  2  |  850 ~ 1700  |
> + *  |   42500 ~  85000  | 10 |  4  | 40 |  4  |  425 ~ 850   |
> + *  |   21250 ~  42500  | 10 |  2  | 40 |  8  | 212.5 ~ 425  |
> + *  |   20000 ~  21250  | 10 |  1  | 40 | 16  |  200 ~ 212.5 |
> + *  +--------------------------------------------------------+
> + */
> +static void ls7a2000_hdmi_phy_pll_config(struct lsdc_device *ldev,
> +					 int fin,
> +					 unsigned int index)
> +{
> +	struct drm_device *ddev = &ldev->base;
> +	int count = 0;
> +	u32 val;
> +
> +	/* Firstly, disable phy pll */
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_PHY_PLL_REG, index, 0x0);
> +
> +	/*
> +	 * Most of time, loongson HDMI require M = 10
> +	 * for example, 10 = (4 * 40) / (8 * 2)
> +	 * here, write "1" to the ODF will get "2"
> +	 */
> +
> +	if (fin >= 170000)
> +		val = (16 << HDMI_PLL_IDF_SHIFT) |
> +		      (40 << HDMI_PLL_LF_SHIFT) |
> +		      (0 << HDMI_PLL_ODF_SHIFT);
> +	else if (fin >= 85000)
> +		val = (8 << HDMI_PLL_IDF_SHIFT) |
> +		      (40 << HDMI_PLL_LF_SHIFT) |
> +		      (1 << HDMI_PLL_ODF_SHIFT);
> +	else if (fin >= 42500)
> +		val = (4 << HDMI_PLL_IDF_SHIFT) |
> +		      (40 << HDMI_PLL_LF_SHIFT) |
> +		      (2 << HDMI_PLL_ODF_SHIFT);
> +	else if  (fin >= 21250)
> +		val = (2 << HDMI_PLL_IDF_SHIFT) |
> +		      (40 << HDMI_PLL_LF_SHIFT) |
> +		      (3 << HDMI_PLL_ODF_SHIFT);
> +	else
> +		val = (1 << HDMI_PLL_IDF_SHIFT) |
> +		      (40 << HDMI_PLL_LF_SHIFT) |
> +		      (4 << HDMI_PLL_ODF_SHIFT);
> +
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_PHY_PLL_REG, index, val);
> +
> +	val |= HDMI_PLL_ENABLE;
> +
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_PHY_PLL_REG, index, val);
> +
> +	udelay(2);
> +
> +	drm_dbg(ddev, "Fin of HDMI-%u: %d kHz\n", index, fin);
> +
> +	/* Wait hdmi phy pll lock */
> +	do {
> +		val = lsdc_pipe_rreg32(ldev, LSDC_HDMI0_PHY_PLL_REG, index);
> +
> +		if (val & HDMI_PLL_LOCKED) {
> +			drm_dbg(ddev, "Setting HDMI-%u PLL take %d cycles\n",
> +				index, count);
> +			break;
> +		}
> +		++count;
> +	} while (count < 1000);
> +
> +	lsdc_pipe_wreg32(ldev, LSDC_HDMI0_PHY_CAL_REG, index, 0x0f000ff0);
> +
> +	if (count >= 1000)
> +		drm_err(ddev, "Setting HDMI-%u PLL failed\n", index);
> +}
> +
> +static void ls7a2000_hdmi_atomic_mode_set(struct drm_encoder *encoder,
> +					  struct drm_crtc_state *crtc_state,
> +					  struct drm_connector_state *conn_state)
> +{
> +	struct lsdc_output *output = encoder_to_lsdc_output(encoder);
> +	struct lsdc_display_pipe *dispipe = output_to_display_pipe(output);
> +	unsigned int index = dispipe->index;
> +	struct drm_device *ddev = encoder->dev;
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	struct drm_display_mode *mode = &crtc_state->mode;
> +
> +	ls7a2000_hdmi_phy_pll_config(ldev, mode->clock, index);
> +
> +	ls7a2000_hdmi_set_avi_infoframe(encoder, mode);
> +
> +	drm_dbg(ddev, "%s modeset finished\n", encoder->name);
> +}
> +
> +static const struct drm_encoder_helper_funcs ls7a2000_encoder_helper_funcs = {
> +	.atomic_disable = ls7a2000_hdmi_atomic_disable,
> +	.atomic_enable = ls7a2000_hdmi_atomic_enable,
> +	.atomic_mode_set = ls7a2000_hdmi_atomic_mode_set,
> +};
> +
> +/*
> + * For LS7A2000:
> + *
> + * 1) Most of board export one vga + hdmi output interface.
> + * 2) Yet, Some boards export double hdmi output interface.
> + * 3) Still have boards export three output(2 hdmi + 1 vga).
> + *
> + * So let's hook hdmi helper funcs to all display pipe, don't miss.
> + * writing hdmi register do no harms.
> + */
> +int ls7a2000_output_init(struct drm_device *ddev,
> +			 struct lsdc_display_pipe *dispipe,
> +			 struct i2c_adapter *ddc,
> +			 unsigned int pipe)
> +{
> +	struct lsdc_output *output = &dispipe->output;
> +	struct drm_encoder *encoder = &output->encoder;
> +	struct drm_connector *connector = &output->connector;
> +	int ret;
> +
> +	ret = drm_encoder_init(ddev, encoder, &ls7a2000_encoder_funcs[pipe],
> +			       DRM_MODE_ENCODER_TMDS, "encoder-%u", pipe);
> +	if (ret)
> +		return ret;
> +
> +	encoder->possible_crtcs = BIT(pipe);
> +
> +	drm_encoder_helper_add(encoder, &ls7a2000_encoder_helper_funcs);
> +
> +	ret = drm_connector_init_with_ddc(ddev, connector,
> +					  &ls7a2000_hdmi_connector_funcs[pipe],
> +					  DRM_MODE_CONNECTOR_HDMIA, ddc);
> +	if (ret)
> +		return ret;
> +
> +	drm_info(ddev, "display pipe-%u has HDMI %s\n", pipe, pipe ? "" : "and/or VGA");
> +
> +	drm_connector_helper_add(connector, &ls7a2000_connector_helpers);
> +
> +	drm_connector_attach_encoder(connector, encoder);
> +
> +	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
> +			    DRM_CONNECTOR_POLL_DISCONNECT;
> +
> +	connector->interlace_allowed = 0;
> +	connector->doublescan_allowed = 0;
> +
> +	return 0;
> +}
> diff --git a/drivers/gpu/drm/loongson/lsdc_pixpll.c b/drivers/gpu/drm/loongson/lsdc_pixpll.c
> new file mode 100644
> index 000000000000..04c15b4697e2
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_pixpll.c
> @@ -0,0 +1,481 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/delay.h>
> +
> +#include <drm/drm_managed.h>
> +
> +#include "lsdc_drv.h"
> +
> +/*
> + * The structure of the pixel PLL registers is evolved with times,
> + * it can be different across different chip also.
> + */
> +
> +/* size is u64, note that all loongson's cpu is little endian.
> + * This structure is same for ls7a2000, ls7a1000 and ls2k2000.
> + */
> +struct lsdc_pixpll_reg {
> +	/* Byte 0 ~ Byte 3 */
> +	unsigned div_out       : 7;   /*  6 : 0     Output clock divider  */
> +	unsigned _reserved_1_  : 14;  /* 20 : 7                           */
> +	unsigned loopc         : 9;   /* 29 : 21    Clock multiplier      */
> +	unsigned _reserved_2_  : 2;   /* 31 : 30                          */
> +
> +	/* Byte 4 ~ Byte 7 */
> +	unsigned div_ref       : 7;   /* 38 : 32    Input clock divider   */
> +	unsigned locked        : 1;   /* 39         PLL locked indicator  */
> +	unsigned sel_out       : 1;   /* 40         output clk selector   */
> +	unsigned _reserved_3_  : 2;   /* 42 : 41                          */
> +	unsigned set_param     : 1;   /* 43         Trigger the update    */
> +	unsigned bypass        : 1;   /* 44                               */
> +	unsigned powerdown     : 1;   /* 45                               */
> +	unsigned _reserved_4_  : 18;  /* 46 : 63    no use                */
> +};
> +
> +union lsdc_pixpll_reg_bitmap {
> +	struct lsdc_pixpll_reg bitmap;
> +	u32 w[2];
> +	u64 d;
> +};
> +
> +struct clk_to_pixpll_parms_lookup_t {
> +	unsigned int clock;        /* kHz */
> +
> +	unsigned short width;
> +	unsigned short height;
> +	unsigned short vrefresh;
> +
> +	/* Stores parameters for programming the Hardware PLLs */
> +	unsigned short div_out;
> +	unsigned short loopc;
> +	unsigned short div_ref;
> +};
> +
> +static const struct clk_to_pixpll_parms_lookup_t pixpll_parms_table[] = {
> +	{148500, 1920, 1080, 60,  11, 49,  3},   /* 1920x1080@60Hz */
> +	{141750, 1920, 1080, 60,  11, 78,  5},   /* 1920x1080@60Hz */
> +						 /* 1920x1080@50Hz */
> +	{174500, 1920, 1080, 75,  17, 89,  3},   /* 1920x1080@75Hz */
> +	{181250, 2560, 1080, 75,  8,  58,  4},   /* 2560x1080@75Hz */
> +	{297000, 2560, 1080, 30,  8,  95,  4},   /* 3840x2160@30Hz */
> +	{301992, 1920, 1080, 100, 10, 151, 5},   /* 1920x1080@100Hz */
> +	{146250, 1680, 1050, 60,  16, 117, 5},   /* 1680x1050@60Hz */
> +	{135000, 1280, 1024, 75,  10, 54,  4},   /* 1280x1024@75Hz */
> +	{119000, 1680, 1050, 60,  20, 119, 5},   /* 1680x1050@60Hz */
> +	{108000, 1600, 900,  60,  15, 81,  5},   /* 1600x900@60Hz  */
> +						 /* 1280x1024@60Hz */
> +						 /* 1280x960@60Hz */
> +						 /* 1152x864@75Hz */
> +
> +	{106500, 1440, 900,  60,  19, 81,  4},   /* 1440x900@60Hz */
> +	{88750,  1440, 900,  60,  16, 71,  5},   /* 1440x900@60Hz */
> +	{83500,  1280, 800,  60,  17, 71,  5},   /* 1280x800@60Hz */
> +	{71000,  1280, 800,  60,  20, 71,  5},   /* 1280x800@60Hz */
> +
> +	{74250,  1280, 720,  60,  22, 49,  3},   /* 1280x720@60Hz */
> +						 /* 1280x720@50Hz */
> +
> +	{78750,  1024, 768,  75,  16, 63,  5},   /* 1024x768@75Hz */
> +	{75000,  1024, 768,  70,  29, 87,  4},   /* 1024x768@70Hz */
> +	{65000,  1024, 768,  60,  20, 39,  3},   /* 1024x768@60Hz */
> +
> +	{51200,  1024, 600,  60,  25, 64,  5},   /* 1024x600@60Hz */
> +
> +	{57284,  832,  624,  75,  24, 55,  4},   /* 832x624@75Hz */
> +	{49500,  800,  600,  75,  40, 99,  5},   /* 800x600@75Hz */
> +	{50000,  800,  600,  72,  44, 88,  4},   /* 800x600@72Hz */
> +	{40000,  800,  600,  60,  30, 36,  3},   /* 800x600@60Hz */
> +	{36000,  800,  600,  56,  50, 72,  4},   /* 800x600@56Hz */
> +	{31500,  640,  480,  75,  40, 63,  5},   /* 640x480@75Hz */
> +						 /* 640x480@73Hz */
> +
> +	{30240,  640,  480,  67,  62, 75,  4},   /* 640x480@67Hz */
> +	{27000,  720,  576,  50,  50, 54,  4},   /* 720x576@60Hz */
> +	{25175,  640,  480,  60,  85, 107, 5},   /* 640x480@60Hz */
> +	{25200,  640,  480,  60,  50, 63,  5},   /* 640x480@60Hz */
> +						 /* 720x480@60Hz */
> +};
> +
> +static void lsdc_pixel_pll_free(struct drm_device *ddev, void *data)
> +{
> +	struct lsdc_pixpll *this = (struct lsdc_pixpll *)data;
> +
> +	iounmap(this->mmio);
> +
> +	kfree(this->priv);
> +
> +	drm_dbg(ddev, "pixpll private data freed\n");
> +}
> +
> +/*
> + * ioremap the device dependent PLL registers
> + *
> + * @this: point to the object where this function is called from
> + */
> +static int lsdc_pixel_pll_setup(struct lsdc_pixpll * const this)
> +{
> +	struct lsdc_pixpll_parms *pparms;
> +
> +	this->mmio = ioremap(this->reg_base, this->reg_size);
> +	if (IS_ERR_OR_NULL(this->mmio))
> +		return -ENOMEM;
> +
> +	pparms = kzalloc(sizeof(*pparms), GFP_KERNEL);
> +	if (IS_ERR_OR_NULL(pparms))
> +		return -ENOMEM;
> +
> +	pparms->ref_clock = LSDC_PLL_REF_CLK_KHZ;
> +
> +	this->priv = pparms;
> +
> +	return drmm_add_action_or_reset(this->ddev, lsdc_pixel_pll_free, this);
> +}
> +
> +/*
> + * Find a set of pll parameters from a static local table which avoid
> + * computing the pll parameter eachtime a modeset is triggered.
> + *
> + * @this: point to the object where this function is called from
> + * @clock: the desired output pixel clock, the unit is kHz
> + * @pout: point to where the parameters to store if found
> + *
> + * Return 0 if success, return -1 if not found.
> + */
> +static int lsdc_pixpll_find(struct lsdc_pixpll * const this,
> +			    unsigned int clock,
> +			    struct lsdc_pixpll_parms *pout)
> +{
> +	unsigned int num = ARRAY_SIZE(pixpll_parms_table);
> +	const struct clk_to_pixpll_parms_lookup_t *pt;
> +	unsigned int i;
> +
> +	for (i = 0; i < num; ++i) {
> +		pt = &pixpll_parms_table[i];
> +
> +		if (clock == pt->clock) {
> +			pout->div_ref = pt->div_ref;
> +			pout->loopc   = pt->loopc;
> +			pout->div_out = pt->div_out;
> +
> +			return 0;
> +		}
> +	}
> +
> +	drm_dbg_kms(this->ddev, "pixel clock %u: miss\n", clock);
> +
> +	return -1;
> +}
> +
> +/*
> + * Find a set of pll parameters which have minimal difference with the
> + * desired pixel clock frequency. It does that by computing all of the
> + * possible combination. Compute the diff and find the combination with
> + * minimal diff.
> + *
> + * clock_out = refclk / div_ref * loopc / div_out
> + *
> + * refclk is determined by the oscillator mounted on motherboard(100MHz
> + * in almost all board)
> + *
> + * @this: point to the object from where this function is called
> + * @clock: the desired output pixel clock, the unit is kHz
> + * @pout: point to the out struct of lsdc_pixpll_parms
> + *
> + * Return 0 if a set of parameter is found, otherwise return the error
> + * between clock_kHz we wanted and the most closest candidate with it.
> + */
> +static int lsdc_pixel_pll_compute(struct lsdc_pixpll * const this,
> +				  unsigned int clock,
> +				  struct lsdc_pixpll_parms *pout)
> +{
> +	struct lsdc_pixpll_parms *pparms = this->priv;
> +	unsigned int refclk = pparms->ref_clock;
> +	const unsigned int tolerance = 1000;
> +	unsigned int min = tolerance;
> +	unsigned int div_out, loopc, div_ref;
> +	unsigned int computed;
> +
> +	if (!lsdc_pixpll_find(this, clock, pout))
> +		return 0;
> +
> +	for (div_out = 6; div_out < 64; div_out++) {
> +		for (div_ref = 3; div_ref < 6; div_ref++) {
> +			for (loopc = 6; loopc < 161; loopc++) {
> +				unsigned int diff = 0;
> +
> +				if (loopc < 12 * div_ref)
> +					continue;
> +				if (loopc > 32 * div_ref)
> +					continue;
> +
> +				computed = refclk / div_ref * loopc / div_out;
> +
> +				if (clock >= computed)
> +					diff = clock - computed;
> +				else
> +					diff = computed - clock;
> +
> +				if (diff < min) {
> +					min = diff;
> +					pparms->div_ref = div_ref;
> +					pparms->div_out = div_out;
> +					pparms->loopc = loopc;
> +
> +					if (diff == 0) {
> +						*pout = *pparms;
> +						return 0;
> +					}
> +				}
> +			}
> +		}
> +	}
> +
> +	/* still acceptable */
> +	if (min < tolerance) {
> +		*pout = *pparms;
> +		return 0;
> +	}
> +
> +	drm_dbg(this->ddev, "can't find suitable params for %u khz\n", clock);
> +
> +	return min;
> +}
> +
> +/* Pixel pll hardware related ops, per display pipe */
> +
> +static void __pixpll_rreg(struct lsdc_pixpll *this,
> +			  union lsdc_pixpll_reg_bitmap *dst)
> +{
> +#if defined(CONFIG_64BIT)
> +	dst->d = readq(this->mmio);
> +#else
> +	dst->w[0] = readl(this->mmio);
> +	dst->w[1] = readl(this->mmio + 4);
> +#endif
> +}
> +
> +static void __pixpll_wreg(struct lsdc_pixpll *this,
> +			  union lsdc_pixpll_reg_bitmap *src)
> +{
> +#if defined(CONFIG_64BIT)
> +	writeq(src->d, this->mmio);
> +#else
> +	writel(src->w[0], this->mmio);
> +	writel(src->w[1], this->mmio + 4);
> +#endif
> +}
> +
> +static void __pixpll_ops_powerup(struct lsdc_pixpll * const this)
> +{
> +	union lsdc_pixpll_reg_bitmap pixpll_reg;
> +
> +	__pixpll_rreg(this, &pixpll_reg);
> +
> +	pixpll_reg.bitmap.powerdown = 0;
> +
> +	__pixpll_wreg(this, &pixpll_reg);
> +}
> +
> +static void __pixpll_ops_powerdown(struct lsdc_pixpll * const this)
> +{
> +	union lsdc_pixpll_reg_bitmap pixpll_reg;
> +
> +	__pixpll_rreg(this, &pixpll_reg);
> +
> +	pixpll_reg.bitmap.powerdown = 1;
> +
> +	__pixpll_wreg(this, &pixpll_reg);
> +}
> +
> +static void __pixpll_ops_on(struct lsdc_pixpll * const this)
> +{
> +	union lsdc_pixpll_reg_bitmap pixpll_reg;
> +
> +	__pixpll_rreg(this, &pixpll_reg);
> +
> +	pixpll_reg.bitmap.sel_out = 1;
> +
> +	__pixpll_wreg(this, &pixpll_reg);
> +}
> +
> +static void __pixpll_ops_off(struct lsdc_pixpll * const this)
> +{
> +	union lsdc_pixpll_reg_bitmap pixpll_reg;
> +
> +	__pixpll_rreg(this, &pixpll_reg);
> +
> +	pixpll_reg.bitmap.sel_out = 0;
> +
> +	__pixpll_wreg(this, &pixpll_reg);
> +}
> +
> +static void __pixpll_ops_bypass(struct lsdc_pixpll * const this)
> +{
> +	union lsdc_pixpll_reg_bitmap pixpll_reg;
> +
> +	__pixpll_rreg(this, &pixpll_reg);
> +
> +	pixpll_reg.bitmap.bypass = 1;
> +
> +	__pixpll_wreg(this, &pixpll_reg);
> +}
> +
> +static void __pixpll_ops_unbypass(struct lsdc_pixpll * const this)
> +{
> +	union lsdc_pixpll_reg_bitmap pixpll_reg;
> +
> +	__pixpll_rreg(this, &pixpll_reg);
> +
> +	pixpll_reg.bitmap.bypass = 0;
> +
> +	__pixpll_wreg(this, &pixpll_reg);
> +}
> +
> +static void __pixpll_ops_untoggle_param(struct lsdc_pixpll * const this)
> +{
> +	union lsdc_pixpll_reg_bitmap pixpll_reg;
> +
> +	__pixpll_rreg(this, &pixpll_reg);
> +
> +	pixpll_reg.bitmap.set_param = 0;
> +
> +	__pixpll_wreg(this, &pixpll_reg);
> +}
> +
> +static void __pixpll_ops_set_param(struct lsdc_pixpll * const this,
> +				   struct lsdc_pixpll_parms const *p)
> +{
> +	union lsdc_pixpll_reg_bitmap pixpll_reg;
> +
> +	__pixpll_rreg(this, &pixpll_reg);
> +
> +	pixpll_reg.bitmap.div_ref = p->div_ref;
> +	pixpll_reg.bitmap.loopc = p->loopc;
> +	pixpll_reg.bitmap.div_out = p->div_out;
> +
> +	__pixpll_wreg(this, &pixpll_reg);
> +}
> +
> +static void __pixpll_ops_toggle_param(struct lsdc_pixpll * const this)
> +{
> +	union lsdc_pixpll_reg_bitmap pixpll_reg;
> +
> +	__pixpll_rreg(this, &pixpll_reg);
> +
> +	pixpll_reg.bitmap.set_param = 1;
> +
> +	__pixpll_wreg(this, &pixpll_reg);
> +}
> +
> +static void __pixpll_ops_wait_locked(struct lsdc_pixpll * const this)
> +{
> +	union lsdc_pixpll_reg_bitmap pixpll_reg;
> +	unsigned int counter = 0;
> +
> +	do {
> +		__pixpll_rreg(this, &pixpll_reg);
> +
> +		if (pixpll_reg.bitmap.locked)
> +			break;
> +
> +		++counter;
> +	} while (counter < 2000);
> +
> +	drm_dbg(this->ddev, "%u loop waited\n", counter);
> +}
> +
> +/*
> + * Update the PLL parameters to the PLL hardware
> + *
> + * @this: point to the object from which this function is called
> + * @pin: point to the struct of lsdc_pixpll_parms passed in
> + *
> + * return 0 if successful.
> + */
> +static int lsdc_pixpll_update(struct lsdc_pixpll * const this,
> +			      struct lsdc_pixpll_parms const *pin)
> +{
> +	__pixpll_ops_bypass(this);
> +
> +	__pixpll_ops_off(this);
> +
> +	__pixpll_ops_powerdown(this);
> +
> +	__pixpll_ops_toggle_param(this);
> +
> +	__pixpll_ops_set_param(this, pin);
> +
> +	__pixpll_ops_untoggle_param(this);
> +
> +	__pixpll_ops_powerup(this);
> +
> +	udelay(2);
> +
> +	__pixpll_ops_wait_locked(this);
> +
> +	__pixpll_ops_on(this);
> +
> +	__pixpll_ops_unbypass(this);
> +
> +	return 0;
> +}
> +
> +static unsigned int lsdc_pixpll_get_freq(struct lsdc_pixpll * const this)
> +{
> +	struct lsdc_pixpll_parms *ppar = this->priv;
> +	union lsdc_pixpll_reg_bitmap pix_pll_reg;
> +	unsigned int freq;
> +
> +	__pixpll_rreg(this, &pix_pll_reg);
> +
> +	ppar->div_ref = pix_pll_reg.bitmap.div_ref;
> +	ppar->loopc = pix_pll_reg.bitmap.loopc;
> +	ppar->div_out = pix_pll_reg.bitmap.div_out;
> +
> +	freq = ppar->ref_clock / ppar->div_ref * ppar->loopc / ppar->div_out;
> +
> +	return freq;
> +}
> +
> +static void lsdc_pixpll_print(struct lsdc_pixpll * const this,
> +			      struct drm_printer *p)
> +{
> +	struct lsdc_pixpll_parms *parms = this->priv;
> +
> +	drm_printf(p, "div_ref: %u, loopc: %u, div_out: %u\n",
> +		   parms->div_ref, parms->loopc, parms->div_out);
> +}
> +
> +/*
> + * LS7A1000, LS7A2000 and ls2k2000's pixel pll setting register is same,
> + * we take this as default, create a new instance if a different model is
> + * introduced.
> + */
> +static const struct lsdc_pixpll_funcs __pixpll_default_funcs = {
> +	.setup = lsdc_pixel_pll_setup,
> +	.compute = lsdc_pixel_pll_compute,
> +	.update = lsdc_pixpll_update,
> +	.get_rate = lsdc_pixpll_get_freq,
> +	.print = lsdc_pixpll_print,
> +};
> +
> +/* pixel pll initialization */
> +
> +int lsdc_pixpll_init(struct lsdc_pixpll * const this,
> +		     struct drm_device *ddev,
> +		     unsigned int index)
> +{
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	const struct lsdc_desc *descp = ldev->descp;
> +	const struct loongson_gfx_desc *gfx = to_loongson_gfx(descp);
> +
> +	this->ddev = ddev;
> +	this->reg_size = 8;
> +	this->reg_base = gfx->conf_reg_base + gfx->pixpll[index].reg_offset;
> +	this->funcs = &__pixpll_default_funcs;
> +
> +	return this->funcs->setup(this);
> +}
> diff --git a/drivers/gpu/drm/loongson/lsdc_pixpll.h b/drivers/gpu/drm/loongson/lsdc_pixpll.h
> new file mode 100644
> index 000000000000..ec3486d90ab6
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_pixpll.h
> @@ -0,0 +1,86 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LSDC_PIXPLL_H__
> +#define __LSDC_PIXPLL_H__
> +
> +#include <drm/drm_device.h>
> +
> +/*
> + * Loongson Pixel PLL hardware structure
> + *
> + * refclk: reference frequency, 100 MHz from external oscillator
> + * outclk: output frequency desired.
> + *
> + *
> + *               L1       Fref                      Fvco     L2
> + * refclk   +-----------+      +------------------+      +---------+   outclk
> + * ---+---> | Prescaler | ---> | Clock Multiplier | ---> | divider | -------->
> + *    |     +-----------+      +------------------+      +---------+     ^
> + *    |           ^                      ^                    ^          |
> + *    |           |                      |                    |          |
> + *    |           |                      |                    |          |
> + *    |        div_ref                 loopc               div_out       |
> + *    |                                                                  |
> + *    +---- bypass (bypass above software configurable clock if set) ----+
> + *
> + *   outclk = refclk / div_ref * loopc / div_out;
> + *
> + *   sel_out: PLL clock output selector(enable).
> + *
> + *   If sel_out == 1, then enable output clock (turn On);
> + *   If sel_out == 0, then disable output clock (turn Off);
> + *
> + * PLL working requirements:
> + *
> + *  1) 20 MHz <= refclk / div_ref <= 40Mhz
> + *  2) 1.2 GHz <= refclk /div_out * loopc <= 3.2 Ghz
> + */
> +
> +struct lsdc_pixpll_parms {
> +	unsigned int ref_clock;
> +	unsigned int div_ref;
> +	unsigned int loopc;
> +	unsigned int div_out;
> +};
> +
> +struct lsdc_pixpll;
> +
> +struct lsdc_pixpll_funcs {
> +	int (*setup)(struct lsdc_pixpll * const this);
> +
> +	int (*compute)(struct lsdc_pixpll * const this,
> +		       unsigned int clock,
> +		       struct lsdc_pixpll_parms *pout);
> +
> +	int (*update)(struct lsdc_pixpll * const this,
> +		      struct lsdc_pixpll_parms const *pin);
> +
> +	unsigned int (*get_rate)(struct lsdc_pixpll * const this);
> +
> +	void (*print)(struct lsdc_pixpll * const this,
> +		      struct drm_printer *printer);
> +};
> +
> +struct lsdc_pixpll {
> +	const struct lsdc_pixpll_funcs *funcs;
> +
> +	struct drm_device *ddev;
> +
> +	/* PLL register offset */
> +	u32 reg_base;
> +	/* PLL register size in bytes */
> +	u32 reg_size;
> +
> +	void __iomem *mmio;
> +
> +	struct lsdc_pixpll_parms *priv;
> +};
> +
> +int lsdc_pixpll_init(struct lsdc_pixpll * const this,
> +		     struct drm_device *ddev,
> +		     unsigned int index);
> +
> +#endif
> diff --git a/drivers/gpu/drm/loongson/lsdc_plane.c b/drivers/gpu/drm/loongson/lsdc_plane.c
> new file mode 100644
> index 000000000000..2ab3db982aa3
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_plane.c
> @@ -0,0 +1,799 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/delay.h>
> +
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_framebuffer.h>
> +#include <drm/drm_gem_atomic_helper.h>
> +#include <drm/drm_plane_helper.h>
> +
> +#include "lsdc_drv.h"
> +#include "lsdc_regs.h"
> +#include "lsdc_ttm.h"
> +
> +static const u32 lsdc_primary_formats[] = {
> +	DRM_FORMAT_XRGB8888,
> +};
> +
> +static const u32 lsdc_cursor_formats[] = {
> +	DRM_FORMAT_ARGB8888,
> +};
> +
> +static const u64 lsdc_fb_format_modifiers[] = {
> +	DRM_FORMAT_MOD_LINEAR,
> +	DRM_FORMAT_MOD_INVALID
> +};
> +
> +static unsigned int lsdc_get_fb_offset(struct drm_framebuffer *fb,
> +				       struct drm_plane_state *state)
> +{
> +	unsigned int offset = fb->offsets[0];
> +
> +	offset += fb->format->cpp[0] * (state->src_x >> 16);
> +	offset += fb->pitches[0] * (state->src_y >> 16);
> +
> +	return offset;
> +}
> +
> +static u64 lsdc_fb_base_addr(struct drm_framebuffer *fb)
> +{
> +	struct lsdc_device *ldev = to_lsdc(fb->dev);
> +	struct lsdc_bo *lbo = gem_to_lsdc_bo(fb->obj[0]);
> +
> +	return lsdc_bo_gpu_offset(lbo) + ldev->vram_base;
> +}
> +
> +static int lsdc_primary_atomic_check(struct drm_plane *plane,
> +				     struct drm_atomic_state *state)
> +{
> +	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
> +	struct drm_crtc *crtc = new_plane_state->crtc;
> +	struct drm_crtc_state *new_crtc_state;
> +
> +	if (!crtc)
> +		return 0;
> +
> +	new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
> +
> +	return drm_atomic_helper_check_plane_state(new_plane_state,
> +						   new_crtc_state,
> +						   DRM_PLANE_NO_SCALING,
> +						   DRM_PLANE_NO_SCALING,
> +						   false, true);
> +}
> +
> +static void lsdc_primary_atomic_update(struct drm_plane *plane,
> +				       struct drm_atomic_state *state)
> +{
> +	struct lsdc_primary *primary = to_lsdc_primary(plane);
> +	const struct lsdc_primary_plane_ops *ops = primary->ops;
> +	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
> +	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
> +	struct drm_framebuffer *new_fb = new_plane_state->fb;
> +	struct drm_framebuffer *old_fb = old_plane_state->fb;
> +	u64 fb_addr = lsdc_fb_base_addr(new_fb);
> +
> +	fb_addr += lsdc_get_fb_offset(new_fb, new_plane_state);
> +
> +	ops->update_fb_addr(primary, fb_addr);
> +	ops->update_fb_stride(primary, new_fb->pitches[0]);
> +
> +	if (!old_fb || old_fb->format != new_fb->format)
> +		ops->update_fb_format(primary, new_fb->format);
> +}
> +
> +static void lsdc_primary_atomic_disable(struct drm_plane *plane,
> +					struct drm_atomic_state *state)
> +{
> +	/*
> +	 * Do nothing, just prevent call into atomic_update().
> +	 * Writing the format as LSDC_PF_NONE can disable the primary,
> +	 * But it seems not necessary...
> +	 */
> +	drm_dbg(plane->dev, "%s disabled\n", plane->name);
> +}
> +
> +static int lsdc_plane_prepare_fb(struct drm_plane *plane,
> +				 struct drm_plane_state *new_state)
> +{
> +	struct drm_framebuffer *fb = new_state->fb;
> +	struct lsdc_bo *lbo;
> +	u64 gpu_vaddr;
> +	int ret;
> +
> +	if (!fb)
> +		return 0;
> +
> +	lbo = gem_to_lsdc_bo(fb->obj[0]);
> +
> +	ret = lsdc_bo_reserve(lbo);
> +	if (unlikely(ret)) {
> +		drm_err(plane->dev, "bo %p reserve failed\n", lbo);
> +		return ret;
> +	}
> +
> +	ret = lsdc_bo_pin(lbo, LSDC_GEM_DOMAIN_VRAM, &gpu_vaddr);
> +
> +	lsdc_bo_unreserve(lbo);
> +
> +	if (unlikely(ret)) {
> +		drm_err(plane->dev, "bo %p pin failed\n", lbo);
> +		return ret;
> +	}
> +
> +	lsdc_bo_ref(lbo);
> +
> +	if (plane->type != DRM_PLANE_TYPE_CURSOR)
> +		drm_dbg(plane->dev,
> +			"%s[%p] pin at 0x%llx, bo size: %zu\n",
> +			plane->name, lbo, gpu_vaddr, lsdc_bo_size(lbo));
> +
> +	return drm_gem_plane_helper_prepare_fb(plane, new_state);
> +}
> +
> +static void lsdc_plane_cleanup_fb(struct drm_plane *plane,
> +				  struct drm_plane_state *old_state)
> +{
> +	struct drm_framebuffer *fb = old_state->fb;
> +	struct lsdc_bo *lbo;
> +	int ret;
> +
> +	if (!fb)
> +		return;
> +
> +	lbo = gem_to_lsdc_bo(fb->obj[0]);
> +
> +	ret = lsdc_bo_reserve(lbo);
> +	if (unlikely(ret)) {
> +		drm_err(plane->dev, "%p reserve failed\n", lbo);
> +		return;
> +	}
> +
> +	lsdc_bo_unpin(lbo);
> +
> +	lsdc_bo_unreserve(lbo);
> +
> +	lsdc_bo_unref(lbo);
> +
> +	if (plane->type != DRM_PLANE_TYPE_CURSOR)
> +		drm_dbg(plane->dev, "%s unpin\n", plane->name);
> +}
> +
> +static const struct drm_plane_helper_funcs lsdc_primary_helper_funcs = {
> +	.prepare_fb = lsdc_plane_prepare_fb,
> +	.cleanup_fb = lsdc_plane_cleanup_fb,
> +	.atomic_check = lsdc_primary_atomic_check,
> +	.atomic_update = lsdc_primary_atomic_update,
> +	.atomic_disable = lsdc_primary_atomic_disable,
> +};
> +
> +static int lsdc_cursor_plane_atomic_async_check(struct drm_plane *plane,
> +						struct drm_atomic_state *state)
> +{
> +	struct drm_plane_state *new_state;
> +	struct drm_crtc_state *crtc_state;
> +
> +	new_state = drm_atomic_get_new_plane_state(state, plane);
> +
> +	if (!plane->state || !plane->state->fb) {
> +		drm_dbg(plane->dev, "%s: state is NULL\n", plane->name);
> +		return -EINVAL;
> +	}
> +
> +	if (new_state->crtc_w != new_state->crtc_h) {
> +		drm_dbg(plane->dev, "unsupported cursor size: %ux%u\n",
> +			new_state->crtc_w, new_state->crtc_h);
> +		return -EINVAL;
> +	}
> +
> +	if (new_state->crtc_w != 64 && new_state->crtc_w != 32) {
> +		drm_dbg(plane->dev, "unsupported cursor size: %ux%u\n",
> +			new_state->crtc_w, new_state->crtc_h);
> +		return -EINVAL;
> +	}
> +
> +	if (state) {
> +		crtc_state = drm_atomic_get_existing_crtc_state(state, new_state->crtc);
> +	} else {
> +		crtc_state = plane->crtc->state;
> +		drm_dbg(plane->dev, "%s: atomic state is NULL\n", plane->name);
> +	}
> +
> +	if (!crtc_state->active)
> +		return -EINVAL;
> +
> +	if (plane->state->crtc != new_state->crtc ||
> +	    plane->state->src_w != new_state->src_w ||
> +	    plane->state->src_h != new_state->src_h ||
> +	    plane->state->crtc_w != new_state->crtc_w ||
> +	    plane->state->crtc_h != new_state->crtc_h)
> +		return -EINVAL;
> +
> +	if (new_state->visible != plane->state->visible)
> +		return -EINVAL;
> +
> +	return drm_atomic_helper_check_plane_state(plane->state,
> +						   crtc_state,
> +						   DRM_PLANE_NO_SCALING,
> +						   DRM_PLANE_NO_SCALING,
> +						   true, true);
> +}
> +
> +static void lsdc_cursor_plane_atomic_async_update(struct drm_plane *plane,
> +						  struct drm_atomic_state *state)
> +{
> +	struct lsdc_cursor *cursor = to_lsdc_cursor(plane);
> +	const struct lsdc_cursor_plane_ops *ops = cursor->ops;
> +	struct drm_framebuffer *old_fb = plane->state->fb;
> +	struct drm_framebuffer *new_fb;
> +	struct drm_plane_state *new_state;
> +
> +	new_state = drm_atomic_get_new_plane_state(state, plane);
> +
> +	new_fb = plane->state->fb;
> +
> +	plane->state->crtc_x = new_state->crtc_x;
> +	plane->state->crtc_y = new_state->crtc_y;
> +	plane->state->crtc_h = new_state->crtc_h;
> +	plane->state->crtc_w = new_state->crtc_w;
> +	plane->state->src_x = new_state->src_x;
> +	plane->state->src_y = new_state->src_y;
> +	plane->state->src_h = new_state->src_h;
> +	plane->state->src_w = new_state->src_w;
> +	swap(plane->state->fb, new_state->fb);
> +
> +	if (new_state->visible) {
> +		enum lsdc_cursor_size cursor_size;
> +
> +		switch (new_state->crtc_w) {
> +		case 64:
> +			cursor_size = CURSOR_SIZE_64X64;
> +			break;
> +		case 32:
> +			cursor_size = CURSOR_SIZE_32X32;
> +			break;
> +		default:
> +			cursor_size = CURSOR_SIZE_32X32;
> +			break;
> +		}
> +
> +		ops->update_position(cursor, new_state->crtc_x, new_state->crtc_y);
> +
> +		ops->update_cfg(cursor, cursor_size, CURSOR_FORMAT_ARGB8888);
> +
> +		if (!old_fb || old_fb != new_fb)
> +			ops->update_bo_addr(cursor, lsdc_fb_base_addr(new_fb));
> +	}
> +}
> +
> +/* ls7a1000 cursor plane helpers */
> +
> +static int ls7a1000_cursor_plane_atomic_check(struct drm_plane *plane,
> +					      struct drm_atomic_state *state)
> +{
> +	struct drm_plane_state *new_plane_state;
> +	struct drm_crtc_state *new_crtc_state;
> +	struct drm_crtc *crtc;
> +
> +	new_plane_state = drm_atomic_get_new_plane_state(state, plane);
> +
> +	crtc = new_plane_state->crtc;
> +	if (!crtc) {
> +		drm_dbg(plane->dev, "%s is not bind to a crtc\n", plane->name);
> +		return 0;
> +	}
> +
> +	if (new_plane_state->crtc_w != 32 || new_plane_state->crtc_h != 32) {
> +		drm_dbg(plane->dev, "unsupported cursor size: %ux%u\n",
> +			new_plane_state->crtc_w, new_plane_state->crtc_h);
> +		return -EINVAL;
> +	}
> +
> +	new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
> +
> +	return drm_atomic_helper_check_plane_state(new_plane_state,
> +						   new_crtc_state,
> +						   DRM_PLANE_NO_SCALING,
> +						   DRM_PLANE_NO_SCALING,
> +						   true, true);
> +}
> +
> +static void ls7a1000_cursor_plane_atomic_update(struct drm_plane *plane,
> +						struct drm_atomic_state *state)
> +{
> +	struct lsdc_cursor *cursor = to_lsdc_cursor(plane);
> +	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
> +	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
> +	struct drm_framebuffer *new_fb = new_plane_state->fb;
> +	struct drm_framebuffer *old_fb = old_plane_state->fb;
> +	const struct lsdc_cursor_plane_ops *ops = cursor->ops;
> +	u64 addr = lsdc_fb_base_addr(new_fb);
> +
> +	if (!new_plane_state->visible)
> +		return;
> +
> +	ops->update_position(cursor, new_plane_state->crtc_x, new_plane_state->crtc_y);
> +
> +	if (!old_fb || old_fb != new_fb)
> +		ops->update_bo_addr(cursor, addr);
> +
> +	ops->update_cfg(cursor, CURSOR_SIZE_32X32, CURSOR_FORMAT_ARGB8888);
> +}
> +
> +static void ls7a1000_cursor_plane_atomic_disable(struct drm_plane *plane,
> +						 struct drm_atomic_state *state)
> +{
> +	struct lsdc_cursor *cursor = to_lsdc_cursor(plane);
> +	const struct lsdc_cursor_plane_ops *ops = cursor->ops;
> +
> +	ops->update_cfg(cursor, CURSOR_SIZE_32X32, CURSOR_FORMAT_DISABLE);
> +}
> +
> +static const struct drm_plane_helper_funcs ls7a1000_cursor_plane_helper_funcs = {
> +	.prepare_fb = lsdc_plane_prepare_fb,
> +	.cleanup_fb = lsdc_plane_cleanup_fb,
> +	.atomic_check = ls7a1000_cursor_plane_atomic_check,
> +	.atomic_update = ls7a1000_cursor_plane_atomic_update,
> +	.atomic_disable = ls7a1000_cursor_plane_atomic_disable,
> +	.atomic_async_check = lsdc_cursor_plane_atomic_async_check,
> +	.atomic_async_update = lsdc_cursor_plane_atomic_async_update,
> +};
> +
> +/* ls7a2000 cursor plane helpers */
> +
> +static int ls7a2000_cursor_plane_atomic_check(struct drm_plane *plane,
> +					      struct drm_atomic_state *state)
> +{
> +	struct drm_plane_state *new_plane_state;
> +	struct drm_crtc_state *new_crtc_state;
> +	struct drm_crtc *crtc;
> +
> +	new_plane_state = drm_atomic_get_new_plane_state(state, plane);
> +
> +	crtc = new_plane_state->crtc;
> +	if (!crtc) {
> +		drm_dbg(plane->dev, "%s is not bind to a crtc\n", plane->name);
> +		return 0;
> +	}
> +
> +	if (new_plane_state->crtc_w != new_plane_state->crtc_h) {
> +		drm_dbg(plane->dev, "unsupported cursor size: %ux%u\n",
> +			new_plane_state->crtc_w, new_plane_state->crtc_h);
> +		return -EINVAL;
> +	}
> +
> +	if (new_plane_state->crtc_w != 64 && new_plane_state->crtc_w != 32) {
> +		drm_dbg(plane->dev, "unsupported cursor size: %ux%u\n",
> +			new_plane_state->crtc_w, new_plane_state->crtc_h);
> +		return -EINVAL;
> +	}
> +
> +	new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
> +
> +	return drm_atomic_helper_check_plane_state(new_plane_state,
> +						   new_crtc_state,
> +						   DRM_PLANE_NO_SCALING,
> +						   DRM_PLANE_NO_SCALING,
> +						   true, true);
> +}
> +
> +/* Update the format, size and location of the cursor */
> +
> +static void ls7a2000_cursor_plane_atomic_update(struct drm_plane *plane,
> +						struct drm_atomic_state *state)
> +{
> +	struct lsdc_cursor *cursor = to_lsdc_cursor(plane);
> +	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
> +	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
> +	struct drm_framebuffer *new_fb = new_plane_state->fb;
> +	struct drm_framebuffer *old_fb = old_plane_state->fb;
> +	const struct lsdc_cursor_plane_ops *ops = cursor->ops;
> +	enum lsdc_cursor_size cursor_size;
> +
> +	if (!new_plane_state->visible)
> +		return;
> +
> +	ops->update_position(cursor, new_plane_state->crtc_x, new_plane_state->crtc_y);
> +
> +	if (!old_fb || new_fb != old_fb) {
> +		u64 addr = lsdc_fb_base_addr(new_fb);
> +
> +		ops->update_bo_addr(cursor, addr);
> +	}
> +
> +	switch (new_plane_state->crtc_w) {
> +	case 64:
> +		cursor_size = CURSOR_SIZE_64X64;
> +		break;
> +	case 32:
> +		cursor_size = CURSOR_SIZE_32X32;
> +		break;
> +	default:
> +		cursor_size = CURSOR_SIZE_64X64;
> +		break;
> +	}
> +
> +	ops->update_cfg(cursor, cursor_size, CURSOR_FORMAT_ARGB8888);
> +}
> +
> +static void ls7a2000_cursor_plane_atomic_disable(struct drm_plane *plane,
> +						 struct drm_atomic_state *state)
> +{
> +	struct lsdc_cursor *cursor = to_lsdc_cursor(plane);
> +	const struct lsdc_cursor_plane_ops *hw_ops = cursor->ops;
> +
> +	hw_ops->update_cfg(cursor, CURSOR_SIZE_64X64, CURSOR_FORMAT_DISABLE);
> +}
> +
> +static const struct drm_plane_helper_funcs ls7a2000_cursor_plane_helper_funcs = {
> +	.prepare_fb = lsdc_plane_prepare_fb,
> +	.cleanup_fb = lsdc_plane_cleanup_fb,
> +	.atomic_check = ls7a2000_cursor_plane_atomic_check,
> +	.atomic_update = ls7a2000_cursor_plane_atomic_update,
> +	.atomic_disable = ls7a2000_cursor_plane_atomic_disable,
> +	.atomic_async_check = lsdc_cursor_plane_atomic_async_check,
> +	.atomic_async_update = lsdc_cursor_plane_atomic_async_update,
> +};
> +
> +static void lsdc_plane_atomic_print_state(struct drm_printer *p,
> +					  const struct drm_plane_state *state)
> +{
> +	struct drm_framebuffer *fb = state->fb;
> +	u64 addr;
> +
> +	if (!fb)
> +		return;
> +
> +	addr = lsdc_fb_base_addr(fb);
> +
> +	drm_printf(p, "\tdma addr=%llx\n", addr);
> +}
> +
> +static const struct drm_plane_funcs lsdc_plane_funcs = {
> +	.update_plane = drm_atomic_helper_update_plane,
> +	.disable_plane = drm_atomic_helper_disable_plane,
> +	.destroy = drm_plane_cleanup,
> +	.reset = drm_atomic_helper_plane_reset,
> +	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> +	.atomic_print_state = lsdc_plane_atomic_print_state,
> +};
> +
> +/* Primary plane 0 hardware related ops  */
> +
> +static void lsdc_primary0_update_fb_addr(struct lsdc_primary *primary, u64 addr)
> +{
> +	struct lsdc_device *ldev = primary->ldev;
> +	u32 status;
> +	u32 lo, hi;
> +
> +	/* 40-bit width physical address bus */
> +	lo = addr & 0xFFFFFFFF;
> +	hi = (addr >> 32) & 0xFF;
> +
> +	status = lsdc_rreg32(ldev, LSDC_CRTC0_CFG_REG);
> +	if (status & FB_REG_IN_USING) {
> +		lsdc_wreg32(ldev, LSDC_CRTC0_FB1_ADDR_LO_REG, lo);
> +		lsdc_wreg32(ldev, LSDC_CRTC0_FB1_ADDR_HI_REG, hi);
> +	} else {
> +		lsdc_wreg32(ldev, LSDC_CRTC0_FB0_ADDR_LO_REG, lo);
> +		lsdc_wreg32(ldev, LSDC_CRTC0_FB0_ADDR_HI_REG, hi);
> +	}
> +}
> +
> +static void lsdc_primary0_update_fb_stride(struct lsdc_primary *primary, u32 stride)
> +{
> +	struct lsdc_device *ldev = primary->ldev;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC0_STRIDE_REG, stride);
> +}
> +
> +static void lsdc_primary0_update_fb_format(struct lsdc_primary *primary,
> +					   const struct drm_format_info *format)
> +{
> +	struct lsdc_device *ldev = primary->ldev;
> +	u32 status;
> +
> +	status = lsdc_rreg32(ldev, LSDC_CRTC0_CFG_REG);
> +
> +	/*
> +	 * TODO: add RGB565 support, only support XRBG8888 at present
> +	 */
> +	status &= ~CFG_PIX_FMT_MASK;
> +	status |= LSDC_PF_XRGB8888;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC0_CFG_REG, status);
> +}
> +
> +/* Primary plane 1 hardware related ops */
> +
> +static void lsdc_primary1_update_fb_addr(struct lsdc_primary *primary, u64 addr)
> +{
> +	struct lsdc_device *ldev = primary->ldev;
> +	u32 status;
> +	u32 lo, hi;
> +
> +	/* 40-bit width physical address bus */
> +	lo = addr & 0xFFFFFFFF;
> +	hi = (addr >> 32) & 0xFF;
> +
> +	status = lsdc_rreg32(ldev, LSDC_CRTC1_CFG_REG);
> +	if (status & FB_REG_IN_USING) {
> +		lsdc_wreg32(ldev, LSDC_CRTC1_FB1_ADDR_LO_REG, lo);
> +		lsdc_wreg32(ldev, LSDC_CRTC1_FB1_ADDR_HI_REG, hi);
> +	} else {
> +		lsdc_wreg32(ldev, LSDC_CRTC1_FB0_ADDR_LO_REG, lo);
> +		lsdc_wreg32(ldev, LSDC_CRTC1_FB0_ADDR_HI_REG, hi);
> +	}
> +}
> +
> +static void lsdc_primary1_update_fb_stride(struct lsdc_primary *primary, u32 stride)
> +{
> +	struct lsdc_device *ldev = primary->ldev;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC1_STRIDE_REG, stride);
> +}
> +
> +static void lsdc_primary1_update_fb_format(struct lsdc_primary *primary,
> +					   const struct drm_format_info *format)
> +{
> +	struct lsdc_device *ldev = primary->ldev;
> +	u32 status;
> +
> +	status = lsdc_rreg32(ldev, LSDC_CRTC1_CFG_REG);
> +
> +	/*
> +	 * TODO: add RGB565 support, only support XRBG8888 at present
> +	 */
> +	status &= ~CFG_PIX_FMT_MASK;
> +	status |= LSDC_PF_XRGB8888;
> +
> +	lsdc_wreg32(ldev, LSDC_CRTC1_CFG_REG, status);
> +}
> +
> +static const struct lsdc_primary_plane_ops lsdc_primary_plane_hw_ops[2] = {
> +	{
> +		.update_fb_addr = lsdc_primary0_update_fb_addr,
> +		.update_fb_stride = lsdc_primary0_update_fb_stride,
> +		.update_fb_format = lsdc_primary0_update_fb_format,
> +	},
> +	{
> +		.update_fb_addr = lsdc_primary1_update_fb_addr,
> +		.update_fb_stride = lsdc_primary1_update_fb_stride,
> +		.update_fb_format = lsdc_primary1_update_fb_format,
> +	},
> +};
> +
> +/*
> + * Update location, format, enable and disable state of the cursor,
> + * For those who have two hardware cursor, let cursor 0 is attach to CRTC-0,
> + * cursor 1 is attach to CRTC-1. Compositing the primary plane and cursor
> + * plane is automatically done by hardware, the cursor is alway on the top of
> + * the primary plane. In other word, z-order is fixed in hardware and cannot
> + * be changed. For those old DC who has only one hardware cursor, we made it
> + * shared by the two screen, this works on extend screen mode.
> + */
> +
> +/* cursor plane 0 (for pipe 0) related hardware ops */
> +
> +static void lsdc_cursor0_update_bo_addr(struct lsdc_cursor *cursor, u64 addr)
> +{
> +	struct lsdc_device *ldev = cursor->ldev;
> +
> +	/* 40-bit width physical address bus */
> +	lsdc_wreg32(ldev, LSDC_CURSOR0_ADDR_HI_REG, (addr >> 32) & 0xFF);
> +	lsdc_wreg32(ldev, LSDC_CURSOR0_ADDR_LO_REG, addr);
> +}
> +
> +static void lsdc_cursor0_update_position(struct lsdc_cursor *cursor, int x, int y)
> +{
> +	struct lsdc_device *ldev = cursor->ldev;
> +
> +	if (x < 0)
> +		x = 0;
> +
> +	if (y < 0)
> +		y = 0;
> +
> +	lsdc_wreg32(ldev, LSDC_CURSOR0_POSITION_REG, (y << 16) | x);
> +}
> +
> +static void lsdc_cursor0_update_cfg(struct lsdc_cursor *cursor,
> +				    enum lsdc_cursor_size cursor_size,
> +				    enum lsdc_cursor_format fmt)
> +{
> +	struct lsdc_device *ldev = cursor->ldev;
> +	u32 cfg;
> +
> +	cfg = CURSOR_ON_CRTC0 << CURSOR_LOCATION_SHIFT |
> +	      cursor_size << CURSOR_SIZE_SHIFT |
> +	      fmt << CURSOR_FORMAT_SHIFT;
> +
> +	lsdc_wreg32(ldev, LSDC_CURSOR0_CFG_REG, cfg);
> +}
> +
> +/* cursor plane 1 (for pipe 1) related hardware ops */
> +
> +static void lsdc_cursor1_update_bo_addr(struct lsdc_cursor *cursor, u64 addr)
> +{
> +	struct lsdc_device *ldev = cursor->ldev;
> +
> +	/* 40-bit width physical address bus */
> +	lsdc_wreg32(ldev, LSDC_CURSOR1_ADDR_HI_REG, (addr >> 32) & 0xFF);
> +	lsdc_wreg32(ldev, LSDC_CURSOR1_ADDR_LO_REG, addr);
> +}
> +
> +static void lsdc_cursor1_update_position(struct lsdc_cursor *cursor, int x, int y)
> +{
> +	struct lsdc_device *ldev = cursor->ldev;
> +
> +	if (x < 0)
> +		x = 0;
> +
> +	if (y < 0)
> +		y = 0;
> +
> +	lsdc_wreg32(ldev, LSDC_CURSOR1_POSITION_REG, (y << 16) | x);
> +}
> +
> +static void lsdc_cursor1_update_cfg(struct lsdc_cursor *cursor,
> +				    enum lsdc_cursor_size cursor_size,
> +				    enum lsdc_cursor_format fmt)
> +{
> +	struct lsdc_device *ldev = cursor->ldev;
> +	u32 cfg;
> +
> +	cfg = CURSOR_ON_CRTC1 << CURSOR_LOCATION_SHIFT |
> +	      cursor_size << CURSOR_SIZE_SHIFT |
> +	      fmt << CURSOR_FORMAT_SHIFT;
> +
> +	lsdc_wreg32(ldev, LSDC_CURSOR1_CFG_REG, cfg);
> +}
> +
> +/* The hardware cursors become normal since ls7a2000/ls2k2000 */
> +
> +static const struct lsdc_cursor_plane_ops ls7a2000_cursor_hw_ops[2] = {
> +	{
> +		.update_bo_addr = lsdc_cursor0_update_bo_addr,
> +		.update_cfg = lsdc_cursor0_update_cfg,
> +		.update_position = lsdc_cursor0_update_position,
> +	},
> +	{
> +		.update_bo_addr = lsdc_cursor1_update_bo_addr,
> +		.update_cfg = lsdc_cursor1_update_cfg,
> +		.update_position = lsdc_cursor1_update_position,
> +	},
> +};
> +
> +/* Quirks for cursor 1, only for old loongson display controller */
> +
> +static void lsdc_cursor1_update_bo_addr_quirk(struct lsdc_cursor *cursor, u64 addr)
> +{
> +	struct lsdc_device *ldev = cursor->ldev;
> +
> +	/* 40-bit width physical address bus */
> +	lsdc_wreg32(ldev, LSDC_CURSOR0_ADDR_HI_REG, (addr >> 32) & 0xFF);
> +	lsdc_wreg32(ldev, LSDC_CURSOR0_ADDR_LO_REG, addr);
> +}
> +
> +static void lsdc_cursor1_update_position_quirk(struct lsdc_cursor *cursor, int x, int y)
> +{
> +	struct lsdc_device *ldev = cursor->ldev;
> +
> +	if (x < 0)
> +		x = 0;
> +
> +	if (y < 0)
> +		y = 0;
> +
> +	lsdc_wreg32(ldev, LSDC_CURSOR0_POSITION_REG, (y << 16) | x);
> +}
> +
> +static void lsdc_cursor1_update_cfg_quirk(struct lsdc_cursor *cursor,
> +					  enum lsdc_cursor_size cursor_size,
> +					  enum lsdc_cursor_format fmt)
> +{
> +	struct lsdc_device *ldev = cursor->ldev;
> +	u32 cfg;
> +
> +	cfg = CURSOR_ON_CRTC1 << CURSOR_LOCATION_SHIFT |
> +	      cursor_size << CURSOR_SIZE_SHIFT |
> +	      fmt << CURSOR_FORMAT_SHIFT;
> +
> +	lsdc_wreg32(ldev, LSDC_CURSOR0_CFG_REG, cfg);
> +}
> +
> +/*
> + * The unforgiving LS7A1000/LS2K1000 has only one hardware cursors plane
> + */
> +static const struct lsdc_cursor_plane_ops ls7a1000_cursor_hw_ops[2] = {
> +	{
> +		.update_bo_addr = lsdc_cursor0_update_bo_addr,
> +		.update_cfg = lsdc_cursor0_update_cfg,
> +		.update_position = lsdc_cursor0_update_position,
> +	},
> +	{
> +		.update_bo_addr = lsdc_cursor1_update_bo_addr_quirk,
> +		.update_cfg = lsdc_cursor1_update_cfg_quirk,
> +		.update_position = lsdc_cursor1_update_position_quirk,
> +	},
> +};
> +
> +int lsdc_primary_plane_init(struct drm_device *ddev,
> +			    struct drm_plane *plane,
> +			    unsigned int index)
> +{
> +	struct lsdc_primary *primary = to_lsdc_primary(plane);
> +	int ret;
> +
> +	ret = drm_universal_plane_init(ddev, plane, 1 << index,
> +				       &lsdc_plane_funcs,
> +				       lsdc_primary_formats,
> +				       ARRAY_SIZE(lsdc_primary_formats),
> +				       lsdc_fb_format_modifiers,
> +				       DRM_PLANE_TYPE_PRIMARY,
> +				       "ls-primary-plane-%u", index);
> +	if (ret)
> +		return ret;
> +
> +	drm_plane_helper_add(plane, &lsdc_primary_helper_funcs);
> +
> +	primary->ldev = to_lsdc(ddev);
> +	primary->ops = &lsdc_primary_plane_hw_ops[index];
> +
> +	return 0;
> +}
> +
> +int ls7a1000_cursor_plane_init(struct drm_device *ddev,
> +			       struct drm_plane *plane,
> +			       unsigned int index)
> +{
> +	struct lsdc_cursor *cursor = to_lsdc_cursor(plane);
> +	int ret;
> +
> +	ret = drm_universal_plane_init(ddev, plane, 1 << index,
> +				       &lsdc_plane_funcs,
> +				       lsdc_cursor_formats,
> +				       ARRAY_SIZE(lsdc_cursor_formats),
> +				       lsdc_fb_format_modifiers,
> +				       DRM_PLANE_TYPE_CURSOR,
> +				       "ls-cursor-plane-%u", index);
> +	if (ret)
> +		return ret;
> +
> +	cursor->ldev = to_lsdc(ddev);
> +	cursor->ops = &ls7a1000_cursor_hw_ops[index];
> +
> +	drm_plane_helper_add(plane, &ls7a1000_cursor_plane_helper_funcs);
> +
> +	return 0;
> +}
> +
> +int ls7a2000_cursor_plane_init(struct drm_device *ddev,
> +			       struct drm_plane *plane,
> +			       unsigned int index)
> +{
> +	struct lsdc_cursor *cursor = to_lsdc_cursor(plane);
> +	int ret;
> +
> +	ret = drm_universal_plane_init(ddev, plane, 1 << index,
> +				       &lsdc_plane_funcs,
> +				       lsdc_cursor_formats,
> +				       ARRAY_SIZE(lsdc_cursor_formats),
> +				       lsdc_fb_format_modifiers,
> +				       DRM_PLANE_TYPE_CURSOR,
> +				       "ls-cursor-plane-%u", index);
> +	if (ret)
> +		return ret;
> +
> +	cursor->ldev = to_lsdc(ddev);
> +	cursor->ops = &ls7a2000_cursor_hw_ops[index];
> +
> +	drm_plane_helper_add(plane, &ls7a2000_cursor_plane_helper_funcs);
> +
> +	return 0;
> +}
> diff --git a/drivers/gpu/drm/loongson/lsdc_probe.c b/drivers/gpu/drm/loongson/lsdc_probe.c
> new file mode 100644
> index 000000000000..48ba69bb8a98
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_probe.c
> @@ -0,0 +1,56 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include "lsdc_drv.h"
> +#include "lsdc_probe.h"
> +
> +/*
> + * Processor ID (implementation) values for bits 15:8 of the PRID register.
> + */
> +#define LOONGSON_CPU_IMP_MASK           0xff00
> +#define LOONGSON_CPU_IMP_SHIFT          8
> +
> +#define LOONGARCH_CPU_IMP_LS2K1000      0xa0
> +#define LOONGARCH_CPU_IMP_LS2K2000      0xb0
> +#define LOONGARCH_CPU_IMP_LS3A5000      0xc0
> +
> +#define LOONGSON_CPU_MIPS_IMP_LS2K      0x61 /* Loongson 2K Mips series SoC */
> +
> +/*
> + * Particular Revision values for bits 7:0 of the PRID register.
> + */
> +#define LOONGSON_CPU_REV_MASK           0x00ff
> +
> +#define LOONGARCH_CPUCFG_PRID_REG       0x0
> +
> +/*
> + * We can achieve fine-grained control with the information about the host.
> + */
> +
> +unsigned int loongson_cpu_get_prid(u8 *imp, u8 *rev)
> +{
> +	unsigned int prid = 0;
> +
> +#if defined(__loongarch__)
> +	__asm__ volatile("cpucfg %0, %1\n\t"
> +			: "=&r"(prid)
> +			: "r"(LOONGARCH_CPUCFG_PRID_REG)
> +			);
> +#endif
> +
> +#if defined(__mips__)
> +	__asm__ volatile("mfc0\t%0, $15\n\t"
> +			: "=r" (prid)
> +			);
> +#endif
> +
> +	if (imp)
> +		*imp = (prid & LOONGSON_CPU_IMP_MASK) >> LOONGSON_CPU_IMP_SHIFT;
> +
> +	if (rev)
> +		*rev = prid & LOONGSON_CPU_REV_MASK;
> +
> +	return prid;
> +}
> diff --git a/drivers/gpu/drm/loongson/lsdc_probe.h b/drivers/gpu/drm/loongson/lsdc_probe.h
> new file mode 100644
> index 000000000000..8bb6de2e3c64
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_probe.h
> @@ -0,0 +1,12 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LSDC_PROBE_H__
> +#define __LSDC_PROBE_H__
> +
> +/* Helpers for chip detection */
> +unsigned int loongson_cpu_get_prid(u8 *impl, u8 *rev);
> +
> +#endif
> diff --git a/drivers/gpu/drm/loongson/lsdc_regs.h b/drivers/gpu/drm/loongson/lsdc_regs.h
> new file mode 100644
> index 000000000000..e8ea28689c63
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_regs.h
> @@ -0,0 +1,406 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LSDC_REGS_H__
> +#define __LSDC_REGS_H__
> +
> +#include <linux/bitops.h>
> +#include <linux/types.h>
> +
> +/*
> + * PIXEL PLL Reference clock
> + */
> +#define LSDC_PLL_REF_CLK_KHZ            100000
> +
> +/*
> + * Those PLL registers are relative to LSxxxxx_CFG_REG_BASE. xxxxx = 7A1000,
> + * 7A2000, 2K2000, 2K1000 etc.
> + */
> +
> +/* LS7A1000 */
> +
> +#define LS7A1000_PIXPLL0_REG            0x04B0
> +#define LS7A1000_PIXPLL1_REG            0x04C0
> +
> +/* The DC, GPU, Graphic Memory Controller share the single gfxpll */
> +#define LS7A1000_PLL_GFX_REG            0x0490
> +
> +#define LS7A1000_CONF_REG_BASE          0x10010000
> +
> +/* LS7A2000 */
> +
> +#define LS7A2000_PIXPLL0_REG            0x04B0
> +#define LS7A2000_PIXPLL1_REG            0x04C0
> +
> +/* The DC, GPU, Graphic Memory Controller share the single gfxpll */
> +#define LS7A2000_PLL_GFX_REG            0x0490
> +
> +#define LS7A2000_CONF_REG_BASE          0x10010000
> +
> +/* For LSDC_CRTCx_CFG_REG */
> +#define CFG_PIX_FMT_MASK                GENMASK(2, 0)
> +
> +enum lsdc_pixel_format {
> +	LSDC_PF_NONE = 0,
> +	LSDC_PF_XRGB444 = 1,    /* [12 bits] */
> +	LSDC_PF_XRGB555 = 2,    /* [15 bits] */
> +	LSDC_PF_XRGB565 = 3,    /* RGB [16 bits] */
> +	LSDC_PF_XRGB8888 = 4,   /* XRGB [32 bits] */
> +};
> +
> +/*
> + * Each crtc has two set fb address registers usable, FB_REG_IN_USING bit of
> + * LSDC_CRTCx_CFG_REG indicate which fb address register is in using by the
> + * CRTC currently. CFG_PAGE_FLIP is used to trigger the switch, the switching
> + * will be finished at the very next vblank. Trigger it again if you want to
> + * switch back.
> + *
> + * If FB0_ADDR_REG is in using, we write the address to FB0_ADDR_REG,
> + * if FB1_ADDR_REG is in using, we write the address to FB1_ADDR_REG.
> + */
> +#define CFG_PAGE_FLIP                   BIT(7)
> +#define CFG_OUTPUT_ENABLE               BIT(8)
> +#define CFG_HW_CLONE                    BIT(9)
> +/* Indicate witch fb addr reg is in using, currently. read only */
> +#define FB_REG_IN_USING                 BIT(11)
> +#define CFG_GAMMA_EN                    BIT(12)
> +
> +/* The DC get soft reset if this bit changed from "1" to "0", active low */
> +#define CFG_RESET_N                     BIT(20)
> +/* If this bit is set, it say that the CRTC stop working anymore, anchored. */
> +#define CRTC_ANCHORED                   BIT(24)
> +
> +/*
> + * The DMA step of the DC in LS7A2000/LS2K2000 is configurable,
> + * setting those bits on ls7a1000 platform make no effect.
> + */
> +#define CFG_DMA_STEP_MASK              GENMASK(17, 16)
> +#define CFG_DMA_STEP_SHIFT             16
> +enum lsdc_dma_steps {
> +	LSDC_DMA_STEP_256_BYTES = 0,
> +	LSDC_DMA_STEP_128_BYTES = 1,
> +	LSDC_DMA_STEP_64_BYTES = 2,
> +	LSDC_DMA_STEP_32_BYTES = 3,
> +};
> +
> +#define CFG_VALID_BITS_MASK             GENMASK(20, 0)
> +
> +/* For LSDC_CRTCx_HSYNC_REG */
> +#define HSYNC_INV                       BIT(31)
> +#define HSYNC_EN                        BIT(30)
> +#define HSYNC_END_MASK                  GENMASK(28, 16)
> +#define HSYNC_END_SHIFT                 16
> +#define HSYNC_START_MASK                GENMASK(12, 0)
> +#define HSYNC_START_SHIFT               0
> +
> +/* For LSDC_CRTCx_VSYNC_REG */
> +#define VSYNC_INV                       BIT(31)
> +#define VSYNC_EN                        BIT(30)
> +#define VSYNC_END_MASK                  GENMASK(27, 16)
> +#define VSYNC_END_SHIFT                 16
> +#define VSYNC_START_MASK                GENMASK(11, 0)
> +#define VSYNC_START_SHIFT               0
> +
> +/*********** CRTC0 ***********/
> +#define LSDC_CRTC0_CFG_REG              0x1240
> +#define LSDC_CRTC0_FB0_ADDR_LO_REG      0x1260
> +#define LSDC_CRTC0_FB0_ADDR_HI_REG      0x15A0
> +#define LSDC_CRTC0_STRIDE_REG           0x1280
> +#define LSDC_CRTC0_FB_ORIGIN_REG        0x1300
> +#define LSDC_CRTC0_HDISPLAY_REG         0x1400
> +#define LSDC_CRTC0_HSYNC_REG            0x1420
> +#define LSDC_CRTC0_VDISPLAY_REG         0x1480
> +#define LSDC_CRTC0_VSYNC_REG            0x14A0
> +#define LSDC_CRTC0_GAMMA_INDEX_REG      0x14E0
> +#define LSDC_CRTC0_GAMMA_DATA_REG       0x1500
> +#define LSDC_CRTC0_FB1_ADDR_LO_REG      0x1580
> +#define LSDC_CRTC0_FB1_ADDR_HI_REG      0x15C0
> +
> +/*********** CRTC1 ***********/
> +#define LSDC_CRTC1_CFG_REG              0x1250
> +#define LSDC_CRTC1_FB0_ADDR_LO_REG      0x1270
> +#define LSDC_CRTC1_FB0_ADDR_HI_REG      0x15B0
> +#define LSDC_CRTC1_STRIDE_REG           0x1290
> +#define LSDC_CRTC1_FB_ORIGIN_REG        0x1310
> +#define LSDC_CRTC1_HDISPLAY_REG         0x1410
> +#define LSDC_CRTC1_HSYNC_REG            0x1430
> +#define LSDC_CRTC1_VDISPLAY_REG         0x1490
> +#define LSDC_CRTC1_VSYNC_REG            0x14B0
> +#define LSDC_CRTC1_GAMMA_INDEX_REG      0x14F0
> +#define LSDC_CRTC1_GAMMA_DATA_REG       0x1510
> +#define LSDC_CRTC1_FB1_ADDR_LO_REG      0x1590
> +#define LSDC_CRTC1_FB1_ADDR_HI_REG      0x15D0
> +
> +/* For LSDC_CRTCx_DVO_CONF_REG */
> +#define PHY_CLOCK_POL                   BIT(9)
> +#define PHY_CLOCK_EN                    BIT(8)
> +#define PHY_DE_POL                      BIT(1)
> +#define PHY_DATA_EN                     BIT(0)
> +
> +/*********** DVO0 ***********/
> +#define LSDC_CRTC0_DVO_CONF_REG         0x13C0
> +
> +/*********** DVO1 ***********/
> +#define LSDC_CRTC1_DVO_CONF_REG         0x13D0
> +
> +/*
> + * All of the DC variants has the hardware which record the scan position
> + * of the CRTC, [31:16] : current X position, [15:0] : current Y position
> + */
> +#define LSDC_CRTC0_SCAN_POS_REG         0x14C0
> +#define LSDC_CRTC1_SCAN_POS_REG         0x14D0
> +
> +/*
> + * LS7A2000 has Sync Deviation register.
> + */
> +#define SYNC_DEVIATION_EN               BIT(31)
> +#define SYNC_DEVIATION_NUM              GENMASK(12, 0)
> +#define LSDC_CRTC0_SYNC_DEVIATION_REG   0x1B80
> +#define LSDC_CRTC1_SYNC_DEVIATION_REG   0x1B90
> +
> +/*
> + * In gross, LSDC_CRTC1_XXX_REG - LSDC_CRTC0_XXX_REG = 0x10, but not all of
> + * the registers obey this rule, LSDC_CURSORx_XXX_REG just don't honor this.
> + * This is the root cause we can't untangle the code by manpulating offset
> + * of the register access simply. Our hardware engineers are lack experiance
> + * when they design this...
> + */
> +#define CRTC_PIPE_OFFSET                0x10
> +
> +/*
> + * There is only one hardware cursor unit in LS7A1000 and LS2K1000, let
> + * CFG_HW_CLONE_EN bit be "1" could eliminate this embarrassment, we made
> + * it on custom clone mode application. While LS7A2000 has two hardware
> + * cursor unit which is good enough.
> + */
> +#define CURSOR_FORMAT_MASK              GENMASK(1, 0)
> +#define CURSOR_FORMAT_SHIFT             0
> +enum lsdc_cursor_format {
> +	CURSOR_FORMAT_DISABLE = 0,
> +	CURSOR_FORMAT_MONOCHROME = 1,   /* masked */
> +	CURSOR_FORMAT_ARGB8888 = 2,     /* A8R8G8B8 */
> +};
> +
> +/*
> + * LS7A1000 and LS2K1000 only support 32x32, LS2K2000 and LS7A2000 support
> + * 64x64, but it seems that setting this bit make no harms on LS7A1000, it
> + * just don't take effects.
> + */
> +#define CURSOR_SIZE_SHIFT               2
> +enum lsdc_cursor_size {
> +	CURSOR_SIZE_32X32 = 0,
> +	CURSOR_SIZE_64X64 = 1,
> +};
> +
> +#define CURSOR_LOCATION_SHIFT           4
> +enum lsdc_cursor_location {
> +	CURSOR_ON_CRTC0 = 0,
> +	CURSOR_ON_CRTC1 = 1,
> +};
> +
> +#define LSDC_CURSOR0_CFG_REG            0x1520
> +#define LSDC_CURSOR0_ADDR_LO_REG        0x1530
> +#define LSDC_CURSOR0_ADDR_HI_REG        0x15e0
> +#define LSDC_CURSOR0_POSITION_REG       0x1540  /* [31:16] Y, [15:0] X */
> +#define LSDC_CURSOR0_BG_COLOR_REG       0x1550  /* background color */
> +#define LSDC_CURSOR0_FG_COLOR_REG       0x1560  /* foreground color */
> +
> +#define LSDC_CURSOR1_CFG_REG            0x1670
> +#define LSDC_CURSOR1_ADDR_LO_REG        0x1680
> +#define LSDC_CURSOR1_ADDR_HI_REG        0x16e0
> +#define LSDC_CURSOR1_POSITION_REG       0x1690  /* [31:16] Y, [15:0] X */
> +#define LSDC_CURSOR1_BG_COLOR_REG       0x16A0  /* background color */
> +#define LSDC_CURSOR1_FG_COLOR_REG       0x16B0  /* foreground color */
> +
> +/*
> + * DC Interrupt Control Register, 32bit, Address Offset: 1570
> + *
> + * Bits 15:0 inidicate the interrupt status
> + * Bits 31:16 control enable interrupts corresponding to bit 15:0 or not
> + * Write 1 to enable, write 0 to disable
> + *
> + * RF: Read Finished
> + * IDBU: Internal Data Buffer Underflow
> + * IDBFU: Internal Data Buffer Fatal Underflow
> + * CBRF: Cursor Buffer Read Finished Flag, no use.
> + * FBRF0: CRTC-0 reading from its framebuffer finished.
> + * FBRF1: CRTC-1 reading from its framebuffer finished.
> + *
> + * +-------+--------------------------+-------+--------+--------+-------+
> + * | 31:27 |         26:16            | 15:11 |   10   |   9    |   8   |
> + * +-------+--------------------------+-------+--------+--------+-------+
> + * |  N/A  | Interrupt Enable Control |  N/A  | IDBFU0 | IDBFU1 | IDBU0 |
> + * +-------+--------------------------+-------+--------+--------+-------+
> + *
> + * +-------+-------+-------+------+--------+--------+--------+--------+
> + * |   7   |   6   |   5   |  4   |   3    |   2    |   1    |   0    |
> + * +-------+-------+-------+------+--------+--------+--------+--------+
> + * | IDBU1 | FBRF0 | FBRF1 | CRRF | HSYNC0 | VSYNC0 | HSYNC1 | VSYNC1 |
> + * +-------+-------+-------+------+--------+--------+--------+--------+
> + *
> + * unfortunately, CRTC0's interrupt is mess with CRTC1's interrupt in one
> + * register again.
> + */
> +
> +#define LSDC_INT_REG                    0x1570
> +
> +#define INT_CRTC0_VSYNC                 BIT(2)
> +#define INT_CRTC0_HSYNC                 BIT(3)
> +#define INT_CRTC0_RF                    BIT(6)
> +#define INT_CRTC0_IDBU                  BIT(8)
> +#define INT_CRTC0_IDBFU                 BIT(10)
> +
> +#define INT_CRTC1_VSYNC                 BIT(0)
> +#define INT_CRTC1_HSYNC                 BIT(1)
> +#define INT_CRTC1_RF                    BIT(5)
> +#define INT_CRTC1_IDBU                  BIT(7)
> +#define INT_CRTC1_IDBFU                 BIT(9)
> +
> +#define INT_CRTC0_VSYNC_EN              BIT(18)
> +#define INT_CRTC0_HSYNC_EN              BIT(19)
> +#define INT_CRTC0_RF_EN                 BIT(22)
> +#define INT_CRTC0_IDBU_EN               BIT(24)
> +#define INT_CRTC0_IDBFU_EN              BIT(26)
> +
> +#define INT_CRTC1_VSYNC_EN              BIT(16)
> +#define INT_CRTC1_HSYNC_EN              BIT(17)
> +#define INT_CRTC1_RF_EN                 BIT(21)
> +#define INT_CRTC1_IDBU_EN               BIT(23)
> +#define INT_CRTC1_IDBFU_EN              BIT(25)
> +
> +#define INT_STATUS_MASK                 GENMASK(15, 0)
> +
> +/*
> + * LS7A1000/LS7A2000 have 4 gpios which are used to emulated I2C.
> + * They are under control of the LS7A_DC_GPIO_DAT_REG and LS7A_DC_GPIO_DIR_REG
> + * register, Those GPIOs has no relationship whth the GPIO hardware on the
> + * bridge chip itself. Those offsets are relative to DC register base address
> + *
> + * LS2k1000 don't have those registers, they use hardware i2c or general GPIO
> + * emulated i2c from linux i2c subsystem.
> + *
> + * GPIO data register, address offset: 0x1650
> + *   +---------------+-----------+-----------+
> + *   | 7 | 6 | 5 | 4 |  3  |  2  |  1  |  0  |
> + *   +---------------+-----------+-----------+
> + *   |               |    DVO1   |    DVO0   |
> + *   +      N/A      +-----------+-----------+
> + *   |               | SCL | SDA | SCL | SDA |
> + *   +---------------+-----------+-----------+
> + */
> +#define LS7A_DC_GPIO_DAT_REG            0x1650
> +
> +/*
> + *  GPIO Input/Output direction control register, address offset: 0x1660
> + */
> +#define LS7A_DC_GPIO_DIR_REG            0x1660
> +
> +/*
> + *  LS7A2000 has two built-in HDMI Encoder and one VGA encoder
> + */
> +
> +/*
> + * Number of continuous packets may be present
> + * in HDMI hblank and vblank zone, should >= 48
> + */
> +#define LSDC_HDMI0_ZONE_REG             0x1700
> +#define LSDC_HDMI1_ZONE_REG             0x1710
> +
> +#define HDMI_H_ZONE_IDLE_SHIFT          0
> +#define HDMI_V_ZONE_IDLE_SHIFT          16
> +
> +/* HDMI Iterface Control Reg */
> +#define HDMI_INTERFACE_EN               BIT(0)
> +#define HDMI_PACKET_EN                  BIT(1)
> +#define HDMI_AUDIO_EN                   BIT(2)
> +/*
> + * Preamble:
> + * Immediately preceding each video data period or data island period is the
> + * preamble. This is a sequence of eight identical control characters that
> + * indicate whether the upcoming data period is a video data period or is a
> + * data island. The values of CTL0, CTL1, CTL2, and CTL3 indicate the type of
> + * data period that follows.
> + */
> +#define HDMI_VIDEO_PREAMBLE_MASK        GENMASK(7, 4)
> +#define HDMI_VIDEO_PREAMBLE_SHIFT       4
> +/* 1: hw i2c, 0: gpio emu i2c, shouldn't put in LSDC_HDMIx_INTF_CTRL_REG */
> +#define HW_I2C_EN                       BIT(8)
> +#define HDMI_CTL_PERIOD_MODE            BIT(9)
> +#define LSDC_HDMI0_INTF_CTRL_REG        0x1720
> +#define LSDC_HDMI1_INTF_CTRL_REG        0x1730
> +
> +#define HDMI_PHY_EN                     BIT(0)
> +#define HDMI_PHY_RESET_N                BIT(1)
> +#define HDMI_PHY_TERM_L_EN              BIT(8)
> +#define HDMI_PHY_TERM_H_EN              BIT(9)
> +#define HDMI_PHY_TERM_DET_EN            BIT(10)
> +#define HDMI_PHY_TERM_STATUS            BIT(11)
> +#define LSDC_HDMI0_PHY_CTRL_REG         0x1800
> +#define LSDC_HDMI1_PHY_CTRL_REG         0x1810
> +
> +/* High level duration need > 1us */
> +#define HDMI_PLL_ENABLE                 BIT(0)
> +#define HDMI_PLL_LOCKED                 BIT(16)
> +/* Bypass the software configured values, using default source from somewhere */
> +#define HDMI_PLL_BYPASS                 BIT(17)
> +
> +#define HDMI_PLL_IDF_SHIFT              1
> +#define HDMI_PLL_IDF_MASK               GENMASK(5, 1)
> +#define HDMI_PLL_LF_SHIFT               6
> +#define HDMI_PLL_LF_MASK                GENMASK(12, 6)
> +#define HDMI_PLL_ODF_SHIFT              13
> +#define HDMI_PLL_ODF_MASK               GENMASK(15, 13)
> +#define LSDC_HDMI0_PHY_PLL_REG          0x1820
> +#define LSDC_HDMI1_PHY_PLL_REG          0x1830
> +
> +/* LS7A2000/LS2K2000 has hpd status reg, while the two hdmi's status
> + * located at the one register again.
> + */
> +#define LSDC_HDMI_HPD_STATUS_REG        0x1BA0
> +#define HDMI0_HPD_FLAG                  BIT(0)
> +#define HDMI1_HPD_FLAG                  BIT(1)
> +
> +#define LSDC_HDMI0_PHY_CAL_REG          0x18C0
> +#define LSDC_HDMI1_PHY_CAL_REG          0x18D0
> +
> +/* AVI InfoFrame */
> +#define LSDC_HDMI0_AVI_CONTENT0         0x18E0
> +#define LSDC_HDMI1_AVI_CONTENT0         0x18D0
> +#define LSDC_HDMI0_AVI_CONTENT1         0x1900
> +#define LSDC_HDMI1_AVI_CONTENT1         0x1910
> +#define LSDC_HDMI0_AVI_CONTENT2         0x1920
> +#define LSDC_HDMI1_AVI_CONTENT2         0x1930
> +#define LSDC_HDMI0_AVI_CONTENT3         0x1940
> +#define LSDC_HDMI1_AVI_CONTENT3         0x1950
> +
> +/* 1: enable avi infoframe packet, 0: disable avi infoframe packet */
> +#define AVI_PKT_ENABLE                  BIT(0)
> +/* 1: send one every two frame, 0: send one each frame */
> +#define AVI_PKT_SEND_FREQ               BIT(1)
> +/*
> + * 1: write 1 to flush avi reg content0 ~ content3 to the packet to be send,
> + * The hardware will clear this bit automatically.
> + */
> +#define AVI_PKT_UPDATE                  BIT(2)
> +
> +#define LSDC_HDMI0_AVI_INFO_CRTL_REG    0x1960
> +#define LSDC_HDMI1_AVI_INFO_CRTL_REG    0x1970
> +
> +/*
> + * LS7A2000 has the hardware which count the number of vblank generated
> + */
> +#define LSDC_CRTC0_VSYNC_COUNTER_REG    0x1A00
> +#define LSDC_CRTC1_VSYNC_COUNTER_REG    0x1A10
> +
> +/*
> + * LS7A2000 has the audio hardware associate with the HDMI encoder.
> + */
> +#define LSDC_HDMI0_AUDIO_PLL_LO_REG     0x1A20
> +#define LSDC_HDMI1_AUDIO_PLL_LO_REG     0x1A30
> +
> +#define LSDC_HDMI0_AUDIO_PLL_HI_REG     0x1A40
> +#define LSDC_HDMI1_AUDIO_PLL_HI_REG     0x1A50
> +
> +#endif
> diff --git a/drivers/gpu/drm/loongson/lsdc_ttm.c b/drivers/gpu/drm/loongson/lsdc_ttm.c
> new file mode 100644
> index 000000000000..bb0c8fd43a75
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_ttm.c
> @@ -0,0 +1,591 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <drm/drm_drv.h>
> +#include <drm/drm_file.h>
> +#include <drm/drm_gem.h>
> +#include <drm/drm_managed.h>
> +#include <drm/drm_prime.h>
> +
> +#include "lsdc_drv.h"
> +#include "lsdc_ttm.h"
> +
> +const char *lsdc_mem_type_to_str(uint32_t mem_type)
> +{
> +	switch (mem_type) {
> +	case TTM_PL_VRAM:
> +		return "VRAM";
> +	case TTM_PL_TT:
> +		return "GTT";
> +	case TTM_PL_SYSTEM:
> +		return "SYSTEM";
> +	default:
> +		break;
> +	}
> +
> +	return "Unknown";
> +}
> +
> +const char *lsdc_domain_to_str(u32 domain)
> +{
> +	switch (domain) {
> +	case LSDC_GEM_DOMAIN_VRAM:
> +		return "VRAM";
> +	case LSDC_GEM_DOMAIN_GTT:
> +		return "GTT";
> +	case LSDC_GEM_DOMAIN_SYSTEM:
> +		return "SYSTEM";
> +	default:
> +		break;
> +	}
> +
> +	return "Unknown";
> +}
> +
> +static void lsdc_bo_set_placement(struct lsdc_bo *lbo, u32 domain)
> +{
> +	u32 c = 0;
> +	u32 pflags = 0;
> +	u32 i;
> +
> +	if (lbo->tbo.base.size <= PAGE_SIZE)
> +		pflags |= TTM_PL_FLAG_TOPDOWN;
> +
> +	lbo->placement.placement = lbo->placements;
> +	lbo->placement.busy_placement = lbo->placements;
> +
> +	if (domain & LSDC_GEM_DOMAIN_VRAM) {
> +		lbo->placements[c].mem_type = TTM_PL_VRAM;
> +		lbo->placements[c++].flags = pflags;
> +	}
> +
> +	if (domain & LSDC_GEM_DOMAIN_GTT) {
> +		lbo->placements[c].mem_type = TTM_PL_TT;
> +		lbo->placements[c++].flags = pflags;
> +	}
> +
> +	if (domain & LSDC_GEM_DOMAIN_SYSTEM) {
> +		lbo->placements[c].mem_type = TTM_PL_SYSTEM;
> +		lbo->placements[c++].flags = 0;
> +	}
> +
> +	if (!c) {
> +		lbo->placements[c].mem_type = TTM_PL_SYSTEM;
> +		lbo->placements[c++].flags = 0;
> +	}
> +
> +	lbo->placement.num_placement = c;
> +	lbo->placement.num_busy_placement = c;
> +
> +	for (i = 0; i < c; ++i) {
> +		lbo->placements[i].fpfn = 0;
> +		lbo->placements[i].lpfn = 0;
> +	}
> +}
> +
> +static void lsdc_ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *tt)
> +{
> +	ttm_tt_fini(tt);
> +	kfree(tt);
> +}
> +
> +static struct ttm_tt *
> +lsdc_ttm_tt_create(struct ttm_buffer_object *tbo, uint32_t page_flags)
> +{
> +	struct ttm_tt *tt;
> +	int ret;
> +
> +	tt = kzalloc(sizeof(*tt), GFP_KERNEL);
> +	if (!tt)
> +		return NULL;
> +
> +	ret = ttm_sg_tt_init(tt, tbo, page_flags, ttm_cached);
> +	if (ret < 0) {
> +		kfree(tt);
> +		return NULL;
> +	}
> +
> +	return tt;
> +}
> +
> +static int lsdc_ttm_tt_populate(struct ttm_device *bdev,
> +				struct ttm_tt *ttm,
> +				struct ttm_operation_ctx *ctx)
> +{
> +	bool slave = !!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL);
> +
> +	if (slave && ttm->sg) {
> +		drm_prime_sg_to_dma_addr_array(ttm->sg,
> +					       ttm->dma_address,
> +					       ttm->num_pages);
> +
> +		return 0;
> +	}
> +
> +	return ttm_pool_alloc(&bdev->pool, ttm, ctx);
> +}
> +
> +static void lsdc_ttm_tt_unpopulate(struct ttm_device *bdev,
> +				   struct ttm_tt *ttm)
> +{
> +	bool slave = !!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL);
> +
> +	if (slave)
> +		return;
> +
> +	return ttm_pool_free(&bdev->pool, ttm);
> +}
> +
> +static void lsdc_bo_evict_flags(struct ttm_buffer_object *tbo,
> +				struct ttm_placement *tplacement)
> +{
> +	struct ttm_resource *resource = tbo->resource;
> +	struct lsdc_bo *lbo = to_lsdc_bo(tbo);
> +
> +	switch (resource->mem_type) {
> +	case TTM_PL_VRAM:
> +		lsdc_bo_set_placement(lbo, LSDC_GEM_DOMAIN_GTT);
> +		break;
> +	case TTM_PL_TT:
> +	default:
> +		lsdc_bo_set_placement(lbo, LSDC_GEM_DOMAIN_SYSTEM);
> +		break;
> +	}
> +
> +	*tplacement = lbo->placement;
> +}
> +
> +static int lsdc_bo_move(struct ttm_buffer_object *tbo,
> +			bool evict,
> +			struct ttm_operation_ctx *ctx,
> +			struct ttm_resource *new_mem,
> +			struct ttm_place *hop)
> +{
> +	struct drm_device *ddev = tbo->base.dev;
> +	struct ttm_resource *old_mem = tbo->resource;
> +	struct lsdc_bo *lbo = to_lsdc_bo(tbo);
> +	int ret;
> +
> +	if (unlikely(tbo->pin_count > 0)) {
> +		drm_warn(ddev, "Can't move a pinned BO\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = ttm_bo_wait_ctx(tbo, ctx);
> +	if (ret)
> +		return ret;
> +
> +	if (!old_mem) {
> +		drm_dbg(ddev, "bo[%p] move: NULL to %s, size: %zu\n",
> +			lbo, lsdc_mem_type_to_str(new_mem->mem_type),
> +			lsdc_bo_size(lbo));
> +		ttm_bo_move_null(tbo, new_mem);
> +		return 0;
> +	}
> +
> +	if (old_mem->mem_type == TTM_PL_SYSTEM && !tbo->ttm) {
> +		ttm_bo_move_null(tbo, new_mem);
> +		drm_dbg(ddev, "bo[%p] move: SYSTEM to NULL, size: %zu\n",
> +			lbo, lsdc_bo_size(lbo));
> +		return 0;
> +	}
> +
> +	if (old_mem->mem_type == TTM_PL_SYSTEM &&
> +	    new_mem->mem_type == TTM_PL_TT) {
> +		drm_dbg(ddev, "bo[%p] move: SYSTEM to GTT, size: %zu\n",
> +			lbo, lsdc_bo_size(lbo));
> +		ttm_bo_move_null(tbo, new_mem);
> +		return 0;
> +	}
> +
> +	if (old_mem->mem_type == TTM_PL_TT &&
> +	    new_mem->mem_type == TTM_PL_SYSTEM) {
> +		drm_dbg(ddev, "bo[%p] move: GTT to SYSTEM, size: %zu\n",
> +			lbo, lsdc_bo_size(lbo));
> +		ttm_resource_free(tbo, &tbo->resource);
> +		ttm_bo_assign_mem(tbo, new_mem);
> +		return 0;
> +	}
> +
> +	drm_dbg(ddev, "bo[%p] move: %s to %s, size: %zu\n",
> +		lbo,
> +		lsdc_mem_type_to_str(old_mem->mem_type),
> +		lsdc_mem_type_to_str(new_mem->mem_type),
> +		lsdc_bo_size(lbo));
> +
> +	return ttm_bo_move_memcpy(tbo, ctx, new_mem);
> +}
> +
> +static int lsdc_bo_reserve_io_mem(struct ttm_device *bdev,
> +				  struct ttm_resource *mem)
> +{
> +	struct lsdc_device *ldev = tdev_to_ldev(bdev);
> +
> +	switch (mem->mem_type) {
> +	case TTM_PL_SYSTEM:
> +		break;
> +	case TTM_PL_TT:
> +		break;
> +	case TTM_PL_VRAM:
> +		mem->bus.offset = (mem->start << PAGE_SHIFT) + ldev->vram_base;
> +		mem->bus.is_iomem = true;
> +		mem->bus.caching = ttm_write_combined;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static struct ttm_device_funcs lsdc_bo_driver = {
> +	.ttm_tt_create = lsdc_ttm_tt_create,
> +	.ttm_tt_populate = lsdc_ttm_tt_populate,
> +	.ttm_tt_unpopulate = lsdc_ttm_tt_unpopulate,
> +	.ttm_tt_destroy = lsdc_ttm_tt_destroy,
> +	.eviction_valuable = ttm_bo_eviction_valuable,
> +	.evict_flags = lsdc_bo_evict_flags,
> +	.move = lsdc_bo_move,
> +	.io_mem_reserve = lsdc_bo_reserve_io_mem,
> +};
> +
> +u64 lsdc_bo_gpu_offset(struct lsdc_bo *lbo)
> +{
> +	struct ttm_buffer_object *tbo = &lbo->tbo;
> +	struct drm_device *ddev = tbo->base.dev;
> +	struct ttm_resource *resource = tbo->resource;
> +
> +	if (unlikely(!tbo->pin_count)) {
> +		drm_err(ddev, "unpinned bo, gpu virtual address is invalid\n");
> +		return 0;
> +	}
> +
> +	if (unlikely(resource->mem_type == TTM_PL_SYSTEM))
> +		return 0;
> +
> +	return resource->start << PAGE_SHIFT;
> +}
> +
> +size_t lsdc_bo_size(struct lsdc_bo *lbo)
> +{
> +	struct ttm_buffer_object *tbo = &lbo->tbo;
> +
> +	return tbo->base.size;
> +}
> +
> +int lsdc_bo_reserve(struct lsdc_bo *lbo)
> +{
> +	return ttm_bo_reserve(&lbo->tbo, true, false, NULL);
> +}
> +
> +void lsdc_bo_unreserve(struct lsdc_bo *lbo)
> +{
> +	return ttm_bo_unreserve(&lbo->tbo);
> +}
> +
> +int lsdc_bo_pin(struct lsdc_bo *lbo, u32 domain, u64 *gpu_addr)
> +{
> +	struct ttm_operation_ctx ctx = { false, false };
> +	struct ttm_buffer_object *tbo = &lbo->tbo;
> +	struct lsdc_device *ldev = tdev_to_ldev(tbo->bdev);
> +	int ret;
> +
> +	if (tbo->pin_count)
> +		goto bo_pinned;
> +
> +	if (lbo->sharing_count && domain == LSDC_GEM_DOMAIN_VRAM)
> +		return -EINVAL;
> +
> +	if (domain)
> +		lsdc_bo_set_placement(lbo, domain);
> +
> +	ret = ttm_bo_validate(tbo, &lbo->placement, &ctx);
> +	if (unlikely(ret)) {
> +		drm_err(&ldev->base, "%p validate failed: %d\n", lbo, ret);
> +		return ret;
> +	}
> +
> +	if (domain == LSDC_GEM_DOMAIN_VRAM)
> +		ldev->vram_pinned_size += lsdc_bo_size(lbo);
> +	else if (domain == LSDC_GEM_DOMAIN_GTT)
> +		ldev->gtt_pinned_size += lsdc_bo_size(lbo);
> +
> +bo_pinned:
> +	ttm_bo_pin(tbo);
> +
> +	if (gpu_addr)
> +		*gpu_addr = lsdc_bo_gpu_offset(lbo);
> +
> +	return 0;
> +}
> +
> +void lsdc_bo_unpin(struct lsdc_bo *lbo)
> +{
> +	struct ttm_buffer_object *tbo = &lbo->tbo;
> +	struct lsdc_device *ldev = tdev_to_ldev(tbo->bdev);
> +
> +	if (unlikely(!tbo->pin_count)) {
> +		drm_dbg(&ldev->base, "%p unpin is not necessary\n", lbo);
> +		return;
> +	}
> +
> +	ttm_bo_unpin(tbo);
> +
> +	if (!tbo->pin_count) {
> +		if (tbo->resource->mem_type == TTM_PL_VRAM)
> +			ldev->vram_pinned_size -= lsdc_bo_size(lbo);
> +		else if (tbo->resource->mem_type == TTM_PL_TT)
> +			ldev->gtt_pinned_size -= lsdc_bo_size(lbo);
> +	}
> +}
> +
> +void lsdc_bo_ref(struct lsdc_bo *lbo)
> +{
> +	struct ttm_buffer_object *tbo = &lbo->tbo;
> +
> +	ttm_bo_get(tbo);
> +}
> +
> +void lsdc_bo_unref(struct lsdc_bo *lbo)
> +{
> +	struct ttm_buffer_object *tbo = &lbo->tbo;
> +
> +	ttm_bo_put(tbo);
> +}
> +
> +int lsdc_bo_kmap(struct lsdc_bo *lbo)
> +{
> +	struct ttm_buffer_object *tbo = &lbo->tbo;
> +	struct drm_gem_object *gem = &tbo->base;
> +	struct drm_device *ddev = gem->dev;
> +	long ret;
> +	int err;
> +
> +	ret = dma_resv_wait_timeout(gem->resv, DMA_RESV_USAGE_KERNEL, false,
> +				    MAX_SCHEDULE_TIMEOUT);
> +	if (ret < 0) {
> +		drm_warn(ddev, "wait fence timeout\n");
> +		return ret;
> +	}
> +
> +	if (lbo->kptr)
> +		return 0;
> +
> +	err = ttm_bo_kmap(tbo, 0, PFN_UP(lsdc_bo_size(lbo)), &lbo->kmap);
> +	if (err) {
> +		drm_err(ddev, "kmap %p failed: %d\n", lbo, err);
> +		return err;
> +	}
> +
> +	lbo->kptr = ttm_kmap_obj_virtual(&lbo->kmap, &lbo->is_iomem);
> +
> +	return 0;
> +}
> +
> +void lsdc_bo_kunmap(struct lsdc_bo *lbo)
> +{
> +	if (!lbo->kptr)
> +		return;
> +
> +	lbo->kptr = NULL;
> +	ttm_bo_kunmap(&lbo->kmap);
> +}
> +
> +void lsdc_bo_clear(struct lsdc_bo *lbo)
> +{
> +	lsdc_bo_kmap(lbo);
> +
> +	if (lbo->is_iomem)
> +		memset_io((void __iomem *)lbo->kptr, 0, lbo->size);
> +	else
> +		memset(lbo->kptr, 0, lbo->size);
> +
> +	lsdc_bo_kunmap(lbo);
> +}
> +
> +int lsdc_bo_evict_vram(struct drm_device *ddev)
> +{
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	struct ttm_device *bdev = &ldev->bdev;
> +	struct ttm_resource_manager *man;
> +
> +	man = ttm_manager_type(bdev, TTM_PL_VRAM);
> +	if (unlikely(!man))
> +		return 0;
> +
> +	return ttm_resource_manager_evict_all(bdev, man);
> +}
> +
> +static void lsdc_bo_destroy(struct ttm_buffer_object *tbo)
> +{
> +	struct lsdc_device *ldev = tdev_to_ldev(tbo->bdev);
> +	struct lsdc_bo *lbo = to_lsdc_bo(tbo);
> +
> +	mutex_lock(&ldev->gem.mutex);
> +	list_del_init(&lbo->list);
> +	mutex_unlock(&ldev->gem.mutex);
> +
> +	drm_gem_object_release(&tbo->base);
> +
> +	kfree(lbo);
> +}
> +
> +struct lsdc_bo *lsdc_bo_create(struct drm_device *ddev,
> +			       u32 domain,
> +			       size_t size,
> +			       bool kernel,
> +			       struct sg_table *sg,
> +			       struct dma_resv *resv)
> +{
> +	struct lsdc_device *ldev = to_lsdc(ddev);
> +	struct ttm_device *bdev = &ldev->bdev;
> +	struct ttm_buffer_object *tbo;
> +	struct lsdc_bo *lbo;
> +	enum ttm_bo_type bo_type;
> +	int ret;
> +
> +	lbo = kzalloc(sizeof(*lbo), GFP_KERNEL);
> +	if (!lbo)
> +		return ERR_PTR(-ENOMEM);
> +
> +	INIT_LIST_HEAD(&lbo->list);
> +
> +	lbo->initial_domain = domain & (LSDC_GEM_DOMAIN_VRAM |
> +					LSDC_GEM_DOMAIN_GTT |
> +					LSDC_GEM_DOMAIN_SYSTEM);
> +
> +	tbo = &lbo->tbo;
> +
> +	size = ALIGN(size, PAGE_SIZE);
> +
> +	ret = drm_gem_object_init(ddev, &tbo->base, size);
> +	if (ret) {
> +		kfree(lbo);
> +		return ERR_PTR(ret);
> +	}
> +
> +	tbo->bdev = bdev;
> +
> +	if (kernel)
> +		bo_type = ttm_bo_type_kernel;
> +	else if (sg)
> +		bo_type = ttm_bo_type_sg;
> +	else
> +		bo_type = ttm_bo_type_device;
> +
> +	lsdc_bo_set_placement(lbo, domain);
> +	lbo->size = size;
> +
> +	ret = ttm_bo_init_validate(bdev, tbo, bo_type, &lbo->placement, 0,
> +				   false, sg, resv, lsdc_bo_destroy);
> +	if (ret) {
> +		kfree(lbo);
> +		return ERR_PTR(ret);
> +	}
> +
> +	return lbo;
> +}
> +
> +struct lsdc_bo *lsdc_bo_create_kernel_pinned(struct drm_device *ddev,
> +					     u32 domain,
> +					     size_t size)
> +{
> +	struct lsdc_bo *lbo;
> +	int ret;
> +
> +	lbo = lsdc_bo_create(ddev, domain, size, true, NULL, NULL);
> +
> +	ret = lsdc_bo_reserve(lbo);
> +	if (unlikely(ret)) {
> +		lsdc_bo_unref(lbo);
> +		return ERR_PTR(ret);
> +	}
> +
> +	ret = lsdc_bo_pin(lbo, domain, NULL);
> +	lsdc_bo_unreserve(lbo);
> +	if (unlikely(ret)) {
> +		lsdc_bo_unref(lbo);
> +		return ERR_PTR(ret);
> +	}
> +
> +	return lbo;
> +}
> +
> +void lsdc_bo_free_kernel_pinned(struct lsdc_bo *lbo)
> +{
> +	int ret;
> +
> +	ret = lsdc_bo_reserve(lbo);
> +	if (unlikely(ret))
> +		return;
> +
> +	lsdc_bo_unpin(lbo);
> +	lsdc_bo_unreserve(lbo);
> +
> +	lsdc_bo_unref(lbo);
> +}
> +
> +static void lsdc_ttm_fini(struct drm_device *ddev, void *data)
> +{
> +	struct lsdc_device *ldev = (struct lsdc_device *)data;
> +
> +	ttm_range_man_fini(&ldev->bdev, TTM_PL_VRAM);
> +	ttm_range_man_fini(&ldev->bdev, TTM_PL_TT);
> +
> +	ttm_device_fini(&ldev->bdev);
> +
> +	drm_dbg(ddev, "ttm finished\n");
> +}
> +
> +int lsdc_ttm_init(struct lsdc_device *ldev)
> +{
> +	struct drm_device *ddev = &ldev->base;
> +	unsigned long num_vram_pages;
> +	unsigned long num_gtt_pages;
> +	int ret;
> +
> +	ret = ttm_device_init(&ldev->bdev, &lsdc_bo_driver, ddev->dev,
> +			      ddev->anon_inode->i_mapping,
> +			      ddev->vma_offset_manager, false, true);
> +	if (ret)
> +		return ret;
> +
> +	num_vram_pages = ldev->vram_size >> PAGE_SHIFT;
> +
> +	ret = ttm_range_man_init(&ldev->bdev, TTM_PL_VRAM, false, num_vram_pages);
> +	if (unlikely(ret))
> +		return ret;
> +
> +	drm_info(ddev, "VRAM: %lu pages ready\n", num_vram_pages);
> +
> +	/* 512M is far enough for us now */
> +	ldev->gtt_size = 512 << 20;
> +
> +	num_gtt_pages = ldev->gtt_size >> PAGE_SHIFT;
> +
> +	ret = ttm_range_man_init(&ldev->bdev, TTM_PL_TT, true, num_gtt_pages);
> +	if (unlikely(ret))
> +		return ret;
> +
> +	drm_info(ddev, "GTT: %lu pages ready\n", num_gtt_pages);
> +
> +	return drmm_add_action_or_reset(ddev, lsdc_ttm_fini, ldev);
> +}
> +
> +void lsdc_ttm_debugfs_init(struct lsdc_device *ldev)
> +{
> +	struct ttm_device *bdev = &ldev->bdev;
> +	struct drm_device *ddev = &ldev->base;
> +	struct drm_minor *minor = ddev->primary;
> +	struct dentry *root = minor->debugfs_root;
> +	struct ttm_resource_manager *vram_man;
> +	struct ttm_resource_manager *gtt_man;
> +
> +	vram_man = ttm_manager_type(bdev, TTM_PL_VRAM);
> +	gtt_man = ttm_manager_type(bdev, TTM_PL_TT);
> +
> +	ttm_resource_manager_create_debugfs(vram_man, root, "vram_mm");
> +	ttm_resource_manager_create_debugfs(gtt_man, root, "gtt_mm");
> +}
> diff --git a/drivers/gpu/drm/loongson/lsdc_ttm.h b/drivers/gpu/drm/loongson/lsdc_ttm.h
> new file mode 100644
> index 000000000000..843e1475064e
> --- /dev/null
> +++ b/drivers/gpu/drm/loongson/lsdc_ttm.h
> @@ -0,0 +1,99 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LSDC_TTM_H__
> +#define __LSDC_TTM_H__
> +
> +#include <linux/container_of.h>
> +#include <linux/iosys-map.h>
> +#include <linux/list.h>
> +
> +#include <drm/drm_gem.h>
> +#include <drm/ttm/ttm_bo.h>
> +#include <drm/ttm/ttm_placement.h>
> +#include <drm/ttm/ttm_range_manager.h>
> +#include <drm/ttm/ttm_tt.h>
> +
> +#define LSDC_GEM_DOMAIN_SYSTEM          0x1
> +#define LSDC_GEM_DOMAIN_GTT             0x2
> +#define LSDC_GEM_DOMAIN_VRAM            0x4
> +
> +struct lsdc_bo {
> +	struct ttm_buffer_object tbo;
> +
> +	/* Protected by gem.mutex */
> +	struct list_head list;
> +
> +	struct iosys_map map;
> +
> +	unsigned int vmap_count;
> +	/* cross device driver sharing reference count */
> +	unsigned int sharing_count;
> +
> +	struct ttm_bo_kmap_obj kmap;
> +	void *kptr;
> +	bool is_iomem;
> +
> +	size_t size;
> +
> +	u32 initial_domain;
> +
> +	struct ttm_placement placement;
> +	struct ttm_place placements[4];
> +};
> +
> +static inline struct ttm_buffer_object *to_ttm_bo(struct drm_gem_object *gem)
> +{
> +	return container_of(gem, struct ttm_buffer_object, base);
> +}
> +
> +static inline struct lsdc_bo *to_lsdc_bo(struct ttm_buffer_object *tbo)
> +{
> +	return container_of(tbo, struct lsdc_bo, tbo);
> +}
> +
> +static inline struct lsdc_bo *gem_to_lsdc_bo(struct drm_gem_object *gem)
> +{
> +	return container_of(gem, struct lsdc_bo, tbo.base);
> +}
> +
> +const char *lsdc_mem_type_to_str(uint32_t mem_type);
> +const char *lsdc_domain_to_str(u32 domain);
> +
> +struct lsdc_bo *lsdc_bo_create(struct drm_device *ddev,
> +			       u32 domain,
> +			       size_t size,
> +			       bool kernel,
> +			       struct sg_table *sg,
> +			       struct dma_resv *resv);
> +
> +struct lsdc_bo *lsdc_bo_create_kernel_pinned(struct drm_device *ddev,
> +					     u32 domain,
> +					     size_t size);
> +
> +void lsdc_bo_free_kernel_pinned(struct lsdc_bo *lbo);
> +
> +int lsdc_bo_reserve(struct lsdc_bo *lbo);
> +void lsdc_bo_unreserve(struct lsdc_bo *lbo);
> +
> +int lsdc_bo_pin(struct lsdc_bo *lbo, u32 domain, u64 *gpu_addr);
> +void lsdc_bo_unpin(struct lsdc_bo *lbo);
> +
> +void lsdc_bo_ref(struct lsdc_bo *lbo);
> +void lsdc_bo_unref(struct lsdc_bo *lbo);
> +
> +u64 lsdc_bo_gpu_offset(struct lsdc_bo *lbo);
> +size_t lsdc_bo_size(struct lsdc_bo *lbo);
> +
> +int lsdc_bo_kmap(struct lsdc_bo *lbo);
> +void lsdc_bo_kunmap(struct lsdc_bo *lbo);
> +void lsdc_bo_clear(struct lsdc_bo *lbo);
> +
> +int lsdc_bo_evict_vram(struct drm_device *ddev);
> +
> +int lsdc_ttm_init(struct lsdc_device *ldev);
> +void lsdc_ttm_debugfs_init(struct lsdc_device *ldev);
> +
> +#endif


-- 
liyi