Re: [PATCH v4 1/5] drm/rockchip: Add basic drm driver

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On 2014年09月22日 21:24, Boris BREZILLON wrote:
Hi Mark,

You'll find some comments inline.
Anyway, I wouldn't call it a review (your driver is using some concepts
I'm not used to, like IOMMUs) but rather a collection of nitpicks :-).

I haven't been through the whole driver yet, but I'll get back to it
soon ;-).

And remember this is a 2 way thing, I wait for your review too
(here is the last version of my driver [1]) :-)


On Mon, 22 Sep 2014 18:48:54 +0800
Mark yao <mark.yao@xxxxxxxxxxxxxx> wrote:

This patch adds the basic structure of a DRM Driver for Rockchip Socs.

Signed-off-by: Mark yao <mark.yao@xxxxxxxxxxxxxx>
---
Changes in v2:
- use the component framework to defer main drm driver probe
   until all VOP devices have been probed.
- use dma-mapping API with ARM_DMA_USE_IOMMU, create dma mapping by
   master device and each vop device can shared the drm dma mapping.
- use drm_crtc_init_with_planes and drm_universal_plane_init.
- remove unnecessary middle layers.
- add cursor set, move funcs to rockchip drm crtc.
- use vop reset at first init
- reference framebuffer when used and unreference when swap out vop

Changes in v3:
- change "crtc->fb" to "crtc->primary-fb"
Adviced by Daniel Vetter
- init cursor plane with universal api, remove unnecessary cursor set,move

Changes in v4:
Adviced by David Herrmann
- remove drm_platform_*() usage, use register drm device directly.
Adviced by Rob Clark
- remove special mmap ioctl, do userspace mmap with normal mmap() or mmap offset

  drivers/gpu/drm/Kconfig                       |    2 +
  drivers/gpu/drm/Makefile                      |    1 +
  drivers/gpu/drm/rockchip/Kconfig              |   19 +
  drivers/gpu/drm/rockchip/Makefile             |   10 +
  drivers/gpu/drm/rockchip/rockchip_drm_drv.c   |  524 ++++++++++
  drivers/gpu/drm/rockchip/rockchip_drm_drv.h   |  120 +++
  drivers/gpu/drm/rockchip/rockchip_drm_fb.c    |  201 ++++
  drivers/gpu/drm/rockchip/rockchip_drm_fb.h    |   28 +
  drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c |  231 +++++
  drivers/gpu/drm/rockchip/rockchip_drm_fbdev.h |   20 +
  drivers/gpu/drm/rockchip/rockchip_drm_gem.c   |  404 ++++++++
  drivers/gpu/drm/rockchip/rockchip_drm_gem.h   |   72 ++
  drivers/gpu/drm/rockchip/rockchip_drm_vop.c   | 1372 +++++++++++++++++++++++++
  drivers/gpu/drm/rockchip/rockchip_drm_vop.h   |  187 ++++
  include/uapi/drm/rockchip_drm.h               |   75 ++
  15 files changed, 3266 insertions(+)
  create mode 100644 drivers/gpu/drm/rockchip/Kconfig
  create mode 100644 drivers/gpu/drm/rockchip/Makefile
  create mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_drv.c
  create mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_drv.h
  create mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_fb.c
  create mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_fb.h
  create mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
  create mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_fbdev.h
  create mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_gem.c
  create mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_gem.h
  create mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_vop.c
  create mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_vop.h
  create mode 100644 include/uapi/drm/rockchip_drm.h

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index b066bb3..7c4c3c6 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -171,6 +171,8 @@ config DRM_SAVAGE
source "drivers/gpu/drm/exynos/Kconfig" +source "drivers/gpu/drm/rockchip/Kconfig"
+
  source "drivers/gpu/drm/vmwgfx/Kconfig"
source "drivers/gpu/drm/gma500/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 4a55d59..d03387a 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_DRM_VMWGFX)+= vmwgfx/
  obj-$(CONFIG_DRM_VIA)	+=via/
  obj-$(CONFIG_DRM_NOUVEAU) +=nouveau/
  obj-$(CONFIG_DRM_EXYNOS) +=exynos/
+obj-$(CONFIG_DRM_ROCKCHIP) +=rockchip/
  obj-$(CONFIG_DRM_GMA500) += gma500/
  obj-$(CONFIG_DRM_UDL) += udl/
  obj-$(CONFIG_DRM_AST) += ast/
diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
new file mode 100644
index 0000000..7146c80
--- /dev/null
+++ b/drivers/gpu/drm/rockchip/Kconfig
@@ -0,0 +1,19 @@
+config DRM_ROCKCHIP
+	tristate "DRM Support for Rockchip"
+	depends on DRM && ROCKCHIP_IOMMU
+	select ARM_DMA_USE_IOMMU
+	select IOMMU_API
+	select DRM_KMS_HELPER
+	select DRM_KMS_FB_HELPER
+	select DRM_PANEL
+	select FB_CFB_FILLRECT
+	select FB_CFB_COPYAREA
+	select FB_CFB_IMAGEBLIT
+	select VT_HW_CONSOLE_BINDING if FRAMEBUFFER_CONSOLE
+	select VIDEOMODE_HELPERS
+	help
+	  Choose this option if you have a Rockchip soc chipset.
+	  This driver provides kernel mode setting and buffer
+	  management to userspace. This driver does not provides
+	  2D or 3D acceleration; acceleration is performed by other
+	  IP found on the SoC.
diff --git a/drivers/gpu/drm/rockchip/Makefile b/drivers/gpu/drm/rockchip/Makefile
new file mode 100644
index 0000000..6e6d468
--- /dev/null
+++ b/drivers/gpu/drm/rockchip/Makefile
@@ -0,0 +1,10 @@
+#
+# Makefile for the drm device driver.  This driver provides support for the
+# Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
+
+ccflags-y := -Iinclude/drm -Idrivers/gpu/drm/rockchip
Do you really need those specific CFLAGS (AFAIK, these path are
already set, though you'll have to include <drm/xxx.h> instead of
"xxx.h" if you're referencing drm headers, but you're already
referencing the correct patch anyway) ?
Sure, I will do it.
+
+rockchipdrm-y := rockchip_drm_drv.o rockchip_drm_fb.o rockchip_drm_fbdev.o \
+		rockchip_drm_gem.o rockchip_drm_vop.o
+
+obj-$(CONFIG_DRM_ROCKCHIP) += rockchipdrm.o
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
new file mode 100644
index 0000000..94926cb
--- /dev/null
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -0,0 +1,524 @@
+/*
+ * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
+ * Author:Mark Yao <mark.yao@xxxxxxxxxxxxxx>
+ *
+ * based on exynos_drm_drv.c
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
[...]

+
+static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
+{
+	struct rockchip_drm_private *private;
+	struct dma_iommu_mapping *mapping;
+	struct device *dev = drm_dev->dev;
+	int ret;
+
+	private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
+	if (!private)
+		return -ENOMEM;
+
+	dev_set_drvdata(drm_dev->dev, dev);
+	drm_dev->dev_private = private;
+
+	drm_mode_config_init(drm_dev);
+
+	rockchip_drm_mode_config_init(drm_dev);
+
+	dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
+				      GFP_KERNEL);
+	if (!dev->dma_parms) {
+		ret = -ENOMEM;
+		goto err_config_cleanup;
+	}
+
+	/* TODO(djkurtz): fetch the mapping start/size from somewhere */
+	mapping = arm_iommu_create_mapping(&platform_bus_type, 0x10000000,
+					   SZ_1G);
+	if (IS_ERR(mapping)) {
+		ret = PTR_ERR(mapping);
+		goto err_config_cleanup;
+	}
+
+	dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+	dma_set_max_seg_size(dev, 0xffffffffu);
+
+	ret = arm_iommu_attach_device(dev, mapping);
+	if (ret)
+		goto err_release_mapping;
+
+	/* Try to bind all sub drivers. */
+	ret = component_bind_all(dev, drm_dev);
+	if (ret)
+		goto err_detach_device;
+
+	/* init kms poll for handling hpd */
+	drm_kms_helper_poll_init(drm_dev);
+
+	/*
+	 * enable drm irq mode.
+	 * - with irq_enabled = true, we can use the vblank feature.
+	 */
+	drm_dev->irq_enabled = true;
+
+	/*
+	 * with vblank_disable_allowed = true, vblank interrupt will be disabled
+	 * by drm timer once a current process gives up ownership of
+	 * vblank event.(after drm_vblank_put function is called)
+	 */
+	drm_dev->vblank_disable_allowed = true;
+
+	ret = drm_vblank_init(drm_dev, ROCKCHIP_MAX_CRTC);
+	if (ret)
+		goto err_kms_helper_poll_fini;
+
+	rockchip_drm_fbdev_init(drm_dev);
+
+	/* force connectors detection */
+	drm_helper_hpd_irq_event(drm_dev);
+
+	return 0;
+
+err_kms_helper_poll_fini:
+	drm_kms_helper_poll_fini(drm_dev);
+	component_unbind_all(dev, drm_dev);
+err_detach_device:
+	arm_iommu_detach_device(dev);
+err_release_mapping:
+	arm_iommu_release_mapping(dev->archdata.mapping);
+err_config_cleanup:
+	drm_mode_config_cleanup(drm_dev);
+	drm_dev->dev_private = NULL;
+	dev_set_drvdata(dev, NULL);

Not sure you need to set driver data to NULL.


oh, dev_set_drvdata is no used now, I will remove it.
+	return ret;
+}
+
[...]

+
+#ifdef CONFIG_PM_SLEEP
+static int rockchip_drm_sys_suspend(struct device *dev)
+{
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
+	pm_message_t message;
+
+	if (pm_runtime_suspended(dev))
+		return 0;
+
+	message.event = PM_EVENT_SUSPEND;
+
+	return rockchip_drm_suspend(drm_dev, message);
+}
+
+static int rockchip_drm_sys_resume(struct device *dev)
+{
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
+
+	if (pm_runtime_suspended(dev))
You meant

	if (!pm_runtime_suspended(dev))

right ?

BTW, I see the same mistake in exynos driver [2]
yes, you are right.

+		return 0;
+
+	return rockchip_drm_resume(drm_dev);
+}
+#endif
+
+static const struct dev_pm_ops rockchip_drm_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
+				rockchip_drm_sys_resume)
+};
+
+int rockchip_drm_add_crtc(struct drm_device *drm, struct drm_crtc *crtc,
+			  struct device_node *np)
+{
+	struct rockchip_drm_private *priv = drm->dev_private;
+	struct device_node *port;
+	int pipe;
+
+	if (priv->num_pipe >= ROCKCHIP_MAX_CRTC)
+		return -EINVAL;
+
+	port = of_get_child_by_name(np, "port");
+	of_node_put(np);
Not sure you should call of_node_put on a node pointer passed as an
argument (unless you previously called of_node_get which is not the case
in this function)...
right, I will remove it.

Best Regards,

Boris

[1]http://thread.gmane.org/gmane.comp.video.dri.devel/114064
[2]https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/drivers/gpu/drm/exynos/exynos_drm_drv.c?id=refs/tags/next-20140922#n373


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