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Fri, 24 Jul 2026 20:18:48 -0700 (PDT) From: Cody Kang Date: Fri, 24 Jul 2026 23:16:43 -0400 Subject: [PATCH 11/17] drm/spacemit: add Saturn DPU DRM device driver Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260724-k3-display-v1-11-f22a10a52867@gmail.com> References: <20260724-k3-display-v1-0-f22a10a52867@gmail.com> In-Reply-To: <20260724-k3-display-v1-0-f22a10a52867@gmail.com> To: David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Yixun Lan , Vinod Koul , Neil Armstrong , Haylen Chu , Michael Turquette , Stephen Boyd , Brian Masney , Philipp Zabel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti Cc: dri-devel@lists.freedesktop.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, spacemit@lists.linux.dev, linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org, linux-clk@vger.kernel.org, Cody Kang X-Mailer: b4 0.15.1 Add the DRM device for the SpacemiT K3 Saturn display processing unit and hook the driver up to the build. The SoC has two DPU instances; each drives one CRTC that scans out a single primary plane in linear RGB at up to 3840x2160@60 and feeds a downstream DP/eDP controller over an OF-graph endpoint. Buffers use drm_gem_shmem_helper. The AFBC/compressed decode path is not exposed and writeback is not implemented. Signed-off-by: Cody Kang --- drivers/gpu/drm/Kconfig | 1 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/spacemit/Kconfig | 18 +++++ drivers/gpu/drm/spacemit/Makefile | 12 +++ drivers/gpu/drm/spacemit/spacemit_drm.c | 132 ++++++++++++++++++++++++++++++++ 5 files changed, 164 insertions(+) diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 323422861e8f..81081562a6da 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -341,6 +341,7 @@ source "drivers/gpu/drm/renesas/Kconfig" source "drivers/gpu/drm/rockchip/Kconfig" source "drivers/gpu/drm/sitronix/Kconfig" source "drivers/gpu/drm/solomon/Kconfig" +source "drivers/gpu/drm/spacemit/Kconfig" source "drivers/gpu/drm/sprd/Kconfig" source "drivers/gpu/drm/sti/Kconfig" source "drivers/gpu/drm/stm/Kconfig" diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index e97faabcd783..4a105520ee91 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -204,6 +204,7 @@ obj-$(CONFIG_DRM_MSM) += msm/ obj-$(CONFIG_DRM_TEGRA) += tegra/ obj-$(CONFIG_DRM_STM) += stm/ obj-$(CONFIG_DRM_STI) += sti/ +obj-$(CONFIG_DRM_SPACEMIT) += spacemit/ obj-y += imx/ obj-$(CONFIG_DRM_INGENIC) += ingenic/ obj-$(CONFIG_DRM_LOGICVC) += logicvc/ diff --git a/drivers/gpu/drm/spacemit/Kconfig b/drivers/gpu/drm/spacemit/Kconfig new file mode 100644 index 000000000000..51e38dabfdba --- /dev/null +++ b/drivers/gpu/drm/spacemit/Kconfig @@ -0,0 +1,18 @@ +# SPDX-License-Identifier: GPL-2.0 + +config DRM_SPACEMIT + tristate "DRM support for SpacemiT display controllers" + depends on DRM && OF && MMU + depends on ARCH_SPACEMIT || COMPILE_TEST + select DRM_CLIENT_SELECTION + select DRM_KMS_HELPER + select DRM_GEM_SHMEM_HELPER + select REGMAP_MMIO + select VIDEOMODE_HELPERS + help + Choose this option if you have a SpacemiT SoC with the Saturn + display processing unit, such as the K3. The DPU scans out + framebuffers through its private display MMU and feeds a + DisplayPort or embedded DisplayPort controller. + + If M is selected the module will be called spacemit-drm. diff --git a/drivers/gpu/drm/spacemit/Makefile b/drivers/gpu/drm/spacemit/Makefile new file mode 100644 index 000000000000..b3b148000cf7 --- /dev/null +++ b/drivers/gpu/drm/spacemit/Makefile @@ -0,0 +1,12 @@ +# SPDX-License-Identifier: GPL-2.0 + +spacemit-drm-y := spacemit_drm.o \ + spacemit_crtc.o \ + spacemit_cmdlist.o \ + spacemit_planes.o \ + spacemit_dmmu.o \ + dpu/dpu_saturn.o \ + dpu/dpu_saturn_hee.o \ + dpu/saturn_fbcmem.o + +obj-$(CONFIG_DRM_SPACEMIT) += spacemit-drm.o diff --git a/drivers/gpu/drm/spacemit/spacemit_drm.c b/drivers/gpu/drm/spacemit/spacemit_drm.c new file mode 100644 index 000000000000..9fb6a7661b48 --- /dev/null +++ b/drivers/gpu/drm/spacemit/spacemit_drm.c @@ -0,0 +1,132 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2025-2026 SpacemiT Co., Ltd. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "spacemit_drm.h" +#include "spacemit_crtc.h" + +#define DRIVER_NAME "spacemit" +#define DRIVER_DESC "SpacemiT SoC DRM driver" +#define DRIVER_MAJOR 1 +#define DRIVER_MINOR 0 + +static void spacemit_drm_atomic_commit_tail(struct drm_atomic_commit *old_state) +{ + struct drm_device *dev = old_state->dev; + + drm_atomic_helper_commit_modeset_disables(dev, old_state); + + drm_atomic_helper_commit_modeset_enables(dev, old_state); + + drm_atomic_helper_commit_planes(dev, old_state, + DRM_PLANE_COMMIT_ACTIVE_ONLY); + + drm_atomic_helper_wait_for_flip_done(dev, old_state); + + drm_atomic_helper_commit_hw_done(old_state); + + drm_atomic_helper_cleanup_planes(dev, old_state); +} + +static const struct drm_mode_config_helper_funcs spacemit_drm_mode_config_helper = { + .atomic_commit_tail = spacemit_drm_atomic_commit_tail, +}; + +static const struct drm_mode_config_funcs spacemit_drm_mode_config_funcs = { + .fb_create = drm_gem_fb_create, + .atomic_check = drm_atomic_helper_check, + .atomic_commit = drm_atomic_helper_commit, +}; + +int spacemit_drm_mode_config_init(struct drm_device *drm) +{ + int ret; + + ret = drmm_mode_config_init(drm); + if (ret) + return ret; + + drm->mode_config.min_width = 1; + drm->mode_config.min_height = 1; + /* K3 user manual: each DPU scans out at most 3840x2160@60 */ + drm->mode_config.max_width = 3840; + drm->mode_config.max_height = 2160; + + drm->mode_config.funcs = &spacemit_drm_mode_config_funcs; + drm->mode_config.helper_private = &spacemit_drm_mode_config_helper; + + return 0; +} + +DEFINE_DRM_GEM_FOPS(spacemit_drm_fops); + +struct drm_driver spacemit_drm_drv = { + .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, + .fops = &spacemit_drm_fops, + + DRM_GEM_SHMEM_DRIVER_OPS, + DRM_FBDEV_SHMEM_DRIVER_OPS, + + .name = DRIVER_NAME, + .desc = DRIVER_DESC, + .major = DRIVER_MAJOR, + .minor = DRIVER_MINOR, +}; + +static int compare_of(struct device *dev, void *data) +{ + return dev->of_node == data; +} + +int spacemit_drm_of_component_probe(struct device *dev) +{ + struct device_node *ports, *port, *ep; + struct device_node *remote; + struct component_match *match = NULL; + + if (!dev->of_node) + return -EINVAL; + + /* The DPU is the drm root: its OF graph names the DP/eDP components. */ + ports = of_get_child_by_name(dev->of_node, "ports"); + if (!ports) { + dev_err(dev, "missing 'ports' child node\n"); + return -EINVAL; + } + + for_each_child_of_node(ports, port) { + if (!of_node_name_eq(port, "port")) + continue; + for_each_child_of_node(port, ep) { + if (!of_node_name_eq(ep, "endpoint")) + continue; + remote = of_graph_get_remote_port_parent(ep); + if (!remote) + continue; + if (of_device_is_available(remote)) + drm_of_component_match_add(dev, &match, + compare_of, remote); + of_node_put(remote); + } + } + of_node_put(ports); + + if (!match) { + dev_err(dev, "no downstream component available\n"); + return -ENODEV; + } + + return component_master_add_with_match(dev, &spacemit_drm_master_ops, + match); +} -- 2.43.0