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Message-ID: <54210C3A.50001@rock-chips.com>
Date: Tue, 23 Sep 2014 13:59:22 +0800
From: Mark yao <mark.yao@...k-chips.com>
To: Boris BREZILLON <boris.brezillon@...e-electrons.com>
CC: heiko@...ech.de, David Airlie <airlied@...il.com>,
Rob Clark <robdclark@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Randy Dunlap <rdunlap@...radead.org>,
Grant Likely <grant.likely@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
John Stultz <john.stultz@...aro.org>,
Rom Lemarchand <romlem@...gle.com>, devicetree@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-api@...r.kernel.org,
linux-rockchip@...ts.infradead.org, dianders@...omium.org,
marcheu@...omium.org, dbehr@...omium.org, olof@...om.net,
djkurtz@...omium.org, xjq@...k-chips.com, kfx@...k-chips.com,
cym@...k-chips.com, cf@...k-chips.com, zyw@...k-chips.com,
xxm@...k-chips.com, huangtao@...k-chips.com,
kever.yang@...k-chips.com, yxj@...k-chips.com, wxt@...k-chips.com,
xw@...k-chips.com
Subject: Re: [PATCH v4 1/5] drm/rockchip: Add basic drm driver
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@...k-chips.com> wrote:
>
>> This patch adds the basic structure of a DRM Driver for Rockchip Socs.
>>
>> Signed-off-by: Mark yao <mark.yao@...k-chips.com>
>> ---
>> 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@...k-chips.com>
>> + *
>> + * 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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