Re: [PATCHv13 3/3] ARM:drm ivip Intel FPGA Video and Image Processing Suite

From: Daniel Vetter
Date: Tue Feb 12 2019 - 04:00:05 EST

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In reply to: Ong, Hean Loong: "Re: [PATCHv13 3/3] ARM:drm ivip Intel FPGA Video and Image Processing Suite"
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On Tue, Feb 12, 2019 at 9:08 AM Ong, Hean Loong
<hean.loong.ong@xxxxxxxxx> wrote:
> On Tue, 2019-02-12 at 08:46 +0100, Daniel Vetter wrote:
> > On Tue, Feb 12, 2019 at 10:36:23AM +0800, Hean-Loong, Ong via dri-
> > devel wrote:
> > > From: Ong, Hean Loong <hean.loong.ong@xxxxxxxxx>
> > >
> > > Driver for Intel FPGA Video and Image Processing Suite Frame Buffer
> > > II.
> > > The driver only supports the Intel Arria10 devkit and its variants.
> > > This driver can be either loaded staticlly or in modules.
> > > The OF device tree binding is located at:
> > > Documentation/devicetree/bindings/display/altr,vip-fb2.txt
> > >
> > > Signed-off-by: Ong, Hean Loong <hean.loong.ong@xxxxxxxxx>
> >
> > It looks like your cover letter and patch 2 didn't make it to the
> > list
> > somehow. Please check those aren't stuck on your side (list admins
> > didn't
> > see them yet).
> >
> That's weird my git send-email says everything was okay
>
> > > ---
> > > drivers/gpu/drm/Kconfig | 2 +
> > > drivers/gpu/drm/Makefile | 1 +
> > > drivers/gpu/drm/ivip/Kconfig | 14 ++
> > > drivers/gpu/drm/ivip/Makefile | 6 +
> > > drivers/gpu/drm/ivip/intel_vip_conn.c | 91 +++++++++
> > > drivers/gpu/drm/ivip/intel_vip_drv.c | 332
> > > +++++++++++++++++++++++++++++++++
> > > drivers/gpu/drm/ivip/intel_vip_drv.h | 73 +++++++
> > > 7 files changed, 519 insertions(+), 0 deletions(-)
> > > create mode 100644 drivers/gpu/drm/ivip/Kconfig
> > > create mode 100644 drivers/gpu/drm/ivip/Makefile
> > > create mode 100644 drivers/gpu/drm/ivip/intel_vip_conn.c
> > > create mode 100644 drivers/gpu/drm/ivip/intel_vip_drv.c
> > > create mode 100644 drivers/gpu/drm/ivip/intel_vip_drv.h
> > >
> > > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> > > index 4385f00..0251a9f 100644
> > > --- a/drivers/gpu/drm/Kconfig
> > > +++ b/drivers/gpu/drm/Kconfig
> > > @@ -235,6 +235,8 @@ source "drivers/gpu/drm/nouveau/Kconfig"
> > >
> > > source "drivers/gpu/drm/i915/Kconfig"
> > >
> > > +source "drivers/gpu/drm/ivip/Kconfig"
> > > +
> > > config DRM_VGEM
> > > tristate "Virtual GEM provider"
> > > depends on DRM
> > > diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> > > index ce8d1d3..85a5694 100644
> > > --- a/drivers/gpu/drm/Makefile
> > > +++ b/drivers/gpu/drm/Makefile
> > > @@ -63,6 +63,7 @@ obj-$(CONFIG_DRM_AMDGPU)+= amd/amdgpu/
> > > obj-$(CONFIG_DRM_MGA) += mga/
> > > obj-$(CONFIG_DRM_I810) += i810/
> > > obj-$(CONFIG_DRM_I915) += i915/
> > > +obj-$(CONFIG_DRM_IVIP) += ivip/
> > > obj-$(CONFIG_DRM_MGAG200) += mgag200/
> > > obj-$(CONFIG_DRM_V3D) += v3d/
> > > obj-$(CONFIG_DRM_VC4) += vc4/
> > > diff --git a/drivers/gpu/drm/ivip/Kconfig
> > > b/drivers/gpu/drm/ivip/Kconfig
> > > new file mode 100644
> > > index 0000000..1d08b90
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/ivip/Kconfig
> > > @@ -0,0 +1,14 @@
> > > +config DRM_IVIP
> > > + tristate "Intel FGPA Video and Image Processing"
> > > + depends on DRM && OF
> > > + select DRM_GEM_CMA_HELPER
> > > + select DRM_KMS_HELPER
> > > + select DRM_KMS_FB_HELPER
> > > + select DRM_KMS_CMA_HELPER
> > > + help
> > > + Choose this option if you have an Intel FPGA
> > > Arria 10 system
> > > + and above with an Intel Display Port IP. This
> > > does not support
> > > + legacy Intel FPGA Cyclone V display port.
> > > Currently only single
> > > + frame buffer is supported. Note that ACPI and
> > > X_86 architecture
> > > + is not supported for Arria10. If M is selected
> > > the module will be
> > > + called ivip.
> > > diff --git a/drivers/gpu/drm/ivip/Makefile
> > > b/drivers/gpu/drm/ivip/Makefile
> > > new file mode 100644
> > > index 0000000..8c54e11
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/ivip/Makefile
> > > @@ -0,0 +1,6 @@
> > > +#
> > > +# Makefile for the drm device driver. This driver provides
> > > support for the
> > > +# Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and
> > > higher.
> > > +
> > > +obj-$(CONFIG_DRM_IVIP) += ivip.o
> > > +ivip-objs := intel_vip_drv.o intel_vip_conn.o
> > > diff --git a/drivers/gpu/drm/ivip/intel_vip_conn.c
> > > b/drivers/gpu/drm/ivip/intel_vip_conn.c
> > > new file mode 100644
> > > index 0000000..93ce0b3
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/ivip/intel_vip_conn.c
> > > @@ -0,0 +1,91 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * Copyright (C) 2019 Intel Corporation.
> > > + *
> > > + * intel_vip_conn.c -- Intel Video and Image Processing(VIP)
> > > + * Frame Buffer II driver
> > > + *
> > > + * This driver supports the Intel VIP Frame Reader component.
> > > + * More info on the hardware can be found in the Intel Video
> > > + * and Image Processing Suite User Guide at this address
> > > + * http://www.altera.com/literature/ug/ug_vip.pdf.
> > > + *
> > > + * Authors:
> > > + * Walter Goossens <waltergoossens@xxxxxxx>
> > > + * Thomas Chou <thomas@xxxxxxxxxxxxx>
> > > + * Chris Rauer <crauer@xxxxxxxxxx>
> > > + * Ong, Hean-Loong <hean.loong.ong@xxxxxxxxx>
> > > + *
> > > + */
> > > +
> > > +#include <linux/init.h>
> > > +#include <linux/kernel.h>
> > > +#include <drm/drm_atomic_helper.h>
> > > +#include <drm/drm_crtc_helper.h>
> > > +#include <drm/drm_encoder_slave.h>
> > > +#include <drm/drm_plane_helper.h>
> > > +
> > > +static enum drm_connector_status
> > > +intelvipfb_drm_connector_detect(struct drm_connector *connector,
> > > bool force)
> > > +{
> > > + return connector_status_connected;
> > > +}
> > > +
> > > +static void intelvipfb_drm_connector_destroy(struct drm_connector
> > > *connector)
> > > +{
> > > + drm_connector_unregister(connector);
> > > + drm_connector_cleanup(connector);
> > > +}
> > > +
> > > +static const struct drm_connector_funcs
> > > intelvipfb_drm_connector_funcs = {
> > > + .detect = intelvipfb_drm_connector_detect,
> > > + .reset = drm_atomic_helper_connector_reset,
> > > + .fill_modes = drm_helper_probe_single_connector_modes,
> > > + .atomic_duplicate_state =
> > > drm_atomic_helper_connector_duplicate_state,
> > > + .atomic_destroy_state =
> > > drm_atomic_helper_connector_destroy_state,
> > > + .destroy = intelvipfb_drm_connector_destroy,
> > > +};
> > > +
> > > +static int intelvipfb_drm_connector_get_modes(struct drm_connector
> > > *connector)
> > > +{
> > > + struct drm_device *drm = connector->dev;
> > > + int count;
> > > +
> > > + count = drm_add_modes_noedid(connector, drm-
> > > >mode_config.max_width,
> > > + drm->mode_config.max_height);
> > > + drm_set_preferred_mode(connector, drm-
> > > >mode_config.max_width,
> > > + drm->mode_config.max_height);
> > > + return count;
> > > +}
> > > +
> > > +static const struct drm_connector_helper_funcs
> > > +intelvipfb_drm_connector_helper_funcs = {
> > > + .get_modes = intelvipfb_drm_connector_get_modes,
> > > +};
> > > +
> > > +struct drm_connector *
> > > +intelvipfb_conn_setup(struct drm_device *drm)
> > > +{
> > > + struct drm_connector *conn;
> > > + int ret;
> > > +
> > > + conn = devm_kzalloc(drm->dev, sizeof(*conn), GFP_KERNEL);
> > > + if (IS_ERR(conn))
> > > + return NULL;
> > > +
> > > + drm_connector_helper_add(conn,
> > > &intelvipfb_drm_connector_helper_funcs);
> > > + ret = drm_connector_init(drm, conn,
> > > &intelvipfb_drm_connector_funcs,
> > > + DRM_MODE_CONNECTOR_DisplayPort);
> > > + if (ret < 0) {
> > > + dev_err(drm->dev, "failed to initialize drm
> > > connector\n");
> > > + ret = -ENOMEM;
> > > + goto error_connector_cleanup;
> > > + }
> > > +
> > > + return conn;
> > > +
> > > +error_connector_cleanup:
> > > + drm_connector_cleanup(conn);
> > > +
> > > + return NULL;
> > > +}
> > > diff --git a/drivers/gpu/drm/ivip/intel_vip_drv.c
> > > b/drivers/gpu/drm/ivip/intel_vip_drv.c
> > > new file mode 100644
> > > index 0000000..38790b7
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/ivip/intel_vip_drv.c
> > > @@ -0,0 +1,332 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * Copyright (C) 2019 Intel Corporation.
> > > + *
> > > + * intel_vip_core.c -- Intel Video and Image Processing(VIP)
> > > + * Frame Buffer II driver
> > > + *
> > > + * This driver supports the Intel VIP Frame Reader component.
> > > + * More info on the hardware can be found in the Intel Video
> > > + * and Image Processing Suite User Guide at this address
> > > + * http://www.altera.com/literature/ug/ug_vip.pdf.
> > > + *
> > > + * Authors:
> > > + * Walter Goossens <waltergoossens@xxxxxxx>
> > > + * Thomas Chou <thomas@xxxxxxxxxxxxx>
> > > + * Chris Rauer <crauer@xxxxxxxxxx>
> > > + * Ong, Hean-Loong <hean.loong.ong@xxxxxxxxx>
> > > + *
> > > + */
> > > +
> > > +#include <drm/drm_atomic.h>
> > > +#include <drm/drm_atomic_helper.h>
> > > +#include <drm/drm_crtc_helper.h>
> > > +#include <drm/drm_fb_helper.h>
> > > +#include <drm/drm_fb_cma_helper.h>
> > > +#include <drm/drm_gem_cma_helper.h>
> > > +#include <drm/drm_gem_framebuffer_helper.h>
> > > +#include <drm/drm_plane_helper.h>
> > > +#include <drm/drm_simple_kms_helper.h>
> > > +
> > > +#include <linux/init.h>
> > > +#include <linux/kernel.h>
> > > +#include <linux/module.h>
> > > +
> > > +#include "intel_vip_drv.h"
> > > +
> > > +static inline struct intelvipfb_priv *
> > > +pipe_to_intelvipdrm(struct drm_simple_display_pipe *pipe)
> > > +{
> > > + return container_of(pipe, struct intelvipfb_priv, pipe);
> > > +}
> > > +
> > > +DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
> > > +
> > > +static struct drm_driver intelvipfb_drm = {
> > > + .driver_features =
> > > + DRIVER_MODESET | DRIVER_GEM |
> > > + DRIVER_PRIME | DRIVER_ATOMIC,
> > > + .gem_free_object_unlocked = drm_gem_cma_free_object,
> > > + .gem_vm_ops = &drm_gem_cma_vm_ops,
> > > + .dumb_create = drm_gem_cma_dumb_create,
> > > + .dumb_destroy = drm_gem_dumb_destroy,
> > > + .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
> > > + .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
> > > + .gem_prime_export = drm_gem_prime_export,
> > > + .gem_prime_import = drm_gem_prime_import,
> > > + .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
> > > + .gem_prime_import_sg_table =
> > > drm_gem_cma_prime_import_sg_table,
> > > + .gem_prime_vmap = drm_gem_cma_prime_vmap,
> > > + .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
> > > + .gem_prime_mmap = drm_gem_cma_prime_mmap,
> > > + .name = DRIVER_NAME,
> > > + .date = "20190129",
> > > + .desc = "Intel FPGA VIP SUITE",
> > > + .major = 1,
> > > + .minor = 0,
> > > + .ioctls = NULL,
> > > + .patchlevel = 0,
> > > + .fops = &drm_fops,
> > > +};
> > > +
> > > +/*
> > > + * Setting up information derived from OF Device Tree Nodes
> > > + * max-width, max-height, bits per pixel, memory port width
> > > + */
> > > +
> > > +static int intelvipfb_drm_setup(struct device *dev,
> > > + struct intelvipfb_priv
> > > *priv)
> > > +{
> > > + struct drm_device *drm = priv->drm;
> > > + struct device_node *np = dev->of_node;
> > > + int mem_word_width;
> > > + int max_h, max_w;
> > > + int ret;
> > > +
> > > + ret = of_property_read_u32(np, "altr,max-width", &max_w);
> > > + if (ret) {
> > > + dev_err(dev,
> > > + "Missing required parameter 'altr,max-
> > > width'");
> > > + return ret;
> > > + }
> > > +
> > > + ret = of_property_read_u32(np, "altr,max-height", &max_h);
> > > + if (ret) {
> > > + dev_err(dev,
> > > + "Missing required parameter 'altr,max-
> > > height'");
> > > + return ret;
> > > + }
> > > +
> > > + ret = of_property_read_u32(np, "altr,mem-port-width",
> > > &mem_word_width);
> > > + if (ret) {
> > > + dev_err(dev, "Missing required parameter
> > > 'altr,mem-port-width '");
> > > + return ret;
> > > + }
> > > +
> > > + if (!(mem_word_width >= 32 && mem_word_width % 32 == 0)) {
> > > + dev_err(dev,
> > > + "mem-word-width is set to %i. must be >=
> > > 32 and multiple of 32.",
> > > + mem_word_width);
> > > + return -ENODEV;
> > > + }
> > > +
> > > + drm->mode_config.min_width = 640;
> > > + drm->mode_config.min_height = 480;
> > > + drm->mode_config.max_width = max_w;
> > > + drm->mode_config.max_height = max_h;
> > > + drm->mode_config.preferred_depth = 32;
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int intelvipfb_of_probe(struct platform_device *pdev)
> > > +{
> > > + int retval;
> > > + struct resource *reg_res;
> > > + struct intelvipfb_priv *priv;
> > > + struct device *dev = &pdev->dev;
> > > + struct drm_device *drm;
> > > +
> > > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > > + if (!priv)
> > > + return -ENOMEM;
> > > +
> > > + /* setup DRM */
> > > + drm = drm_dev_alloc(&intelvipfb_drm, dev);
> >
> > Just a tiny bikeshed: Recommended style nowadays is to use
> > drm_dev_init
> > an embed drm_device into your driver private structure. This means
> > you
> > can't use devm_kzalloc (but to be really strict, almost all usage of
> > devm_kzalloc in drm drivers is broken, but that's an entirely
> > different
> > story). Would be great to switch over to drm_dev_init to align better
> > with
> > some of the planned work we have.
> >
> Sure I think I can fix this
> >
> > > + if (IS_ERR(drm))
> > > + return PTR_ERR(drm);
> > > +
> > > + retval = dma_set_mask_and_coherent(drm->dev,
> > > DMA_BIT_MASK(32));
> > > + if (retval)
> > > + return -ENODEV;
> > > +
> > > + priv->drm = drm;
> > > +
> > > + reg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > + if (!reg_res)
> > > + return -ENOMEM;
> > > +
> > > + priv->base = devm_ioremap_resource(dev, reg_res);
> > > +
> > > + if (IS_ERR(priv->base)) {
> > > + dev_err(dev, "devm_ioremap_resource failed\n");
> > > + retval = PTR_ERR(priv->base);
> > > + return -ENOMEM;
> > > + }
> > > +
> > > + intelvipfb_drm_setup(dev, priv);
> > > +
> > > + dev_set_drvdata(dev, priv);
> > > +
> > > + return intelvipfb_probe(dev);
> > > +}
> > > +
> > > +static int intelvipfb_of_remove(struct platform_device *pdev)
> > > +{
> > > + return intelvipfb_remove(&pdev->dev);
> > > +}
> > > +
> > > +static void intelvipfb_enable(struct drm_simple_display_pipe
> > > *pipe,
> > > + struct drm_crtc_state *crtc_state,
> > > + struct drm_plane_state *
> > > + plane_state)
> > > +{
> > > + /*
> > > + * The frameinfo variable has to correspond to the size of
> > > the VIP Suite
> > > + * Frame Reader register 7 which will determine the
> > > maximum size used
> > > + * in this frameinfo
> > > + */
> > > + struct intelvipfb_priv *priv = pipe_to_intelvipdrm(pipe);
> > > + u32 frameinfo;
> > > + void __iomem *base = priv->base;
> > > + struct drm_plane_state *state = pipe->plane.state;
> > > + dma_addr_t addr;
> > > +
> > > + addr = drm_fb_cma_get_gem_addr(state->fb, state, 0);
> > > +
> > > + frameinfo =
> > > + readl(base + INTELVIPFB_FRAME_READER) &
> > > 0x00ffffff;
> > > + writel(frameinfo, base + INTELVIPFB_FRAME_INFO);
> > > + writel(addr, base + INTELVIPFB_FRAME_START);
> > > + /* Finally set the control register to 1 to start
> > > streaming */
> > > + writel(1, base + INTELVIPFB_CONTROL);
> > > +}
> > > +
> > > +static void intelvipfb_disable(struct drm_simple_display_pipe
> > > *pipe)
> > > +{
> > > + struct intelvipfb_priv *priv = pipe_to_intelvipdrm(pipe);
> > > + void __iomem *base = priv->base;
> > > + /* set the control register to 0 to stop streaming */
> > > + writel(0, base + INTELVIPFB_CONTROL);
> > > +}
> > > +
> > > +static const struct drm_mode_config_funcs
> > > intelvipfb_mode_config_funcs = {
> > > + .fb_create = drm_gem_fb_create,
> > > + .atomic_check = drm_atomic_helper_check,
> > > + .atomic_commit = drm_atomic_helper_commit,
> > > +};
> > > +
> > > +static void intelvipfb_setup_mode_config(struct drm_device *drm)
> > > +{
> > > + drm_mode_config_init(drm);
> > > + drm->mode_config.funcs = &intelvipfb_mode_config_funcs;
> > > +}
> > > +
> > > +void intelvipfb_display_pipe_update(struct drm_simple_display_pipe
> > > *pipe,
> > > + struct drm_plane_state
> > > *old_state)
> > > +{
> > > + struct intelvipfb_priv *priv = pipe_to_intelvipdrm(pipe);
> > > + struct drm_framebuffer *fb = pipe->plane.state->fb;
> > > + struct drm_crtc *crtc = &priv->pipe.crtc;
> > > +
> > > + if (fb && fb != old_state->fb) {
> > > + if (priv->fb_dirty)
> > > + priv->fb_dirty(fb, NULL, 0, 0, NULL, 0);
> > > + }
> >
> > ->fb_dirty here seems entirely unused. It's also incomplete, there's
> > a lot
> > more to implementing manual upload support than just this here (you
> > need
> > to setup framebuffers with the dirty callback, plus register the new
> > damage property). Imo better if we add this when you start using it,
> > hence
> > please remove ->fb_dirty here and from the headers.
>
> Noted.
> >
> > > +
> > > + if (crtc->state->event) {
> > > + spin_lock_irq(&crtc->dev->event_lock);
> > > + drm_crtc_send_vblank_event(crtc, crtc->state-
> > > >event);
> > > + spin_unlock_irq(&crtc->dev->event_lock);
> > > + crtc->state->event = NULL;
> > > + }
> > > +}
> > > +EXPORT_SYMBOL(intelvipfb_display_pipe_update);
> > > +
> > > +static struct drm_simple_display_pipe_funcs priv_funcs = {
> > > + .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
> > > + .update = intelvipfb_display_pipe_update,
> > > + .enable = intelvipfb_enable,
> > > + .disable = intelvipfb_disable
> > > +};
> > > +
> > > +int intelvipfb_probe(struct device *dev)
> > > +{
> > > + int retval;
> > > + struct drm_device *drm;
> > > + struct intelvipfb_priv *priv = dev_get_drvdata(dev);
> > > +
> > > + struct drm_connector *connector;
> > > + u32 formats[] = {DRM_FORMAT_XRGB8888};
> > > +
> > > + drm = priv->drm;
> > > +
> > > + intelvipfb_setup_mode_config(drm);
> >
> > Personally I'd inline this, it's just 2 lines.
> >
> > > +
> > > + connector = intelvipfb_conn_setup(drm);
> > > + if (!connector) {
> > > + dev_err(drm->dev, "Connector setup failed\n");
> > > + goto err_mode_config;
> > > + }
> > > +
> > > + retval = drm_simple_display_pipe_init(drm,
> > > + &priv->pipe,
> > > + &priv_funcs,
> > > + formats,
> > > + ARRAY_SIZE(formats
> > > ),
> > > + NULL, connector);
> > > +
> > > + if (retval < 0) {
> > > + dev_err(drm->dev, "Cannot setup simple display
> > > pipe\n");
> > > + goto err_mode_config;
> > > + }
> > > +
> > > + drm_mode_config_reset(drm);
> > > +
> > > + drm_dev_register(drm, 0);
> > > +
> > > + drm_fbdev_generic_setup(drm, 32);
> > > +
> > > + dev_info(drm->dev, "ivip: Successfully created fb\n");
> > > +
> > > + return retval;
> > > +
> > > +err_mode_config:
> > > +
> > > + drm_mode_config_cleanup(drm);
> > > + return -ENODEV;
> > > +}
> > > +
> > > +int intelvipfb_remove(struct device *dev)
> > > +{
> > > + struct intelvipfb_priv *priv = dev_get_drvdata(dev);
> > > + struct drm_device *drm = priv->drm;
> > > +
> > > + drm_dev_unregister(drm);
> > > +
> > > + drm_mode_config_cleanup(drm);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static const struct of_device_id intelvipfb_of_match[] = {
> > > + { .compatible = "altr,vip-frame-buffer-2.0" },
> > > + {},
> > > +/*
> > > + * The name vip-frame-buffer-2.0 is derived from
> > > + * http://www.altera.com/literature/ug/ug_vip.pdf
> > > + * frame buffer IP cores section 14
> > > + */
> > > +};
> > > +
> > > +MODULE_DEVICE_TABLE(of, intelvipfb_of_match);
> > > +
> > > +static struct platform_driver intelvipfb_driver = {
> > > + .probe = intelvipfb_of_probe,
> > > + .remove = intelvipfb_of_remove,
> > > + .driver = {
> > > + .name = DRIVER_NAME,
> > > + .of_match_table = intelvipfb_of_match,
> > > + },
> > > +};
> > > +
> > > +module_platform_driver(intelvipfb_driver);
> > > +
> > > +/* Original author of Altera Frame Buffer*/
> > > +MODULE_AUTHOR("Walter Goossens <waltergoossens@xxxxxxx>");
> > > +MODULE_AUTHOR("Thomas Chou <thomas@xxxxxxxxxxxxx>");
> > > +MODULE_AUTHOR("Chris Rauer <crauer@xxxxxxxxxx>");
> > > +/* Author of Intel FPGA Frame Buffer II*/
> > > +MODULE_AUTHOR("Ong, Hean-Loong <hean.loong.ong@xxxxxxxxx>");
> > > +MODULE_DESCRIPTION("Intel VIP Frame Buffer II driver");
> > > +MODULE_LICENSE("GPL v2");
> > > diff --git a/drivers/gpu/drm/ivip/intel_vip_drv.h
> > > b/drivers/gpu/drm/ivip/intel_vip_drv.h
> > > new file mode 100644
> > > index 0000000..821e74e
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/ivip/intel_vip_drv.h
> > > @@ -0,0 +1,73 @@
> > > +/* SPDX-License-Identifier: GPL-2.0 */
> > > +/*
> > > + * Copyright (C) 2019 Intel Corporation.
> > > + *
> > > + * Intel Video and Image Processing(VIP) Frame Buffer II driver.
> > > + * Frame Buffer II driver
> > > + *
> > > + * This driver supports the Intel VIP Frame Reader component.
> > > + * More info on the hardware can be found in the Intel Video
> > > + * and Image Processing Suite User Guide at this address
> > > + * http://www.altera.com/literature/ug/ug_vip.pdf.
> > > + *
> > > + * Authors:
> > > + * Walter Goossens <waltergoossens@xxxxxxx>
> > > + * Thomas Chou <thomas@xxxxxxxxxxxxx>
> > > + * Chris Rauer <crauer@xxxxxxxxxx>
> > > + * Ong, Hean-Loong <hean.loong.ong@xxxxxxxxx>
> > > + *
> > > + */
> > > +#ifndef _INTEL_VIP_DRV_H
> > > +#define _INTEL_VIP_DRV_H
> > > +
> > > +#define DRIVER_NAME "intelvipfb"
> > > +#define BYTES_PER_PIXEL 4
> > > +#define CRTC_NUM 1
> > > +#define CONN_NUM 1
> > > +
> > > +/* control registers */
> > > +#define INTELVIPFB_CONTROL 0
> > > +#define INTELVIPFB_STATUS 0x4
> > > +#define INTELVIPFB_INTERRUPT 0x8
> > > +#define INTELVIPFB_FRAME_COUNTER 0xC
> > > +#define INTELVIPFB_FRAME_DROP 0x10
> > > +#define INTELVIPFB_FRAME_INFO 0x14
> > > +#define INTELVIPFB_FRAME_START 0x18
> > > +#define INTELVIPFB_FRAME_READER 0x1C
> > > +
> > > +int intelvipfb_probe(struct device *dev);
> > > +int intelvipfb_remove(struct device *dev);
> > > +int intelvipfb_setup_crtc(struct drm_device *drm);
> > > +struct drm_connector *intelvipfb_conn_setup(struct drm_device
> > > *drm);
> > > +
> > > +struct intelvipfb_priv {
> > > + /**
> > > + * @pipe: Display pipe structure
> > > + */
> > > + struct drm_simple_display_pipe pipe;
> > > +
> > > + /**
> > > + * @drm: DRM device
> > > + */
> > > + struct drm_device *drm;
> > > +
> > > + /**
> > > + * @dirty_lock: Serializes framebuffer flushing
> > > + */
> > > + struct mutex dirty_lock;
> > > +
> > > + /**
> > > + * @base: Base memory for the framebuffer
> > > + */
> > > + void __iomem *base;
> > > +
> > > + /**
> > > + * @fb_dirty: Framebuffer dirty callback
> > > + */
> > > + int (*fb_dirty)(struct drm_framebuffer *framebuffer,
> > > + struct drm_file *file_priv, unsigned int
> > > flags,
> > > + unsigned int color, struct drm_clip_rect
> > > *clips,
> > > + unsigned int num_clips);
> > > +};
> > > +
> > > +#endif
> >
> > Very tidy driver, nice work. This looks ready (aside from the tiny
> > nits),
> > one last question: What's the plan with maintainig this? For small
> > drivers
> > I always recommend drm-misc:
> >
> > https://drm.pages.freedesktop.org/maintainer-tools/committer-drm-misc
> > .html#small-drivers
> >
> > This would mean you'd need to familiarize yourself with the tooling
> > and
> > everything. But this also only makes sense if you expect that there
> > will
> > be more contributions from your (or your team).
> >
> > If you want to maintain this in drm-misc pls also add a corresponding
> > MAINTAINERS entry, with you as maintainer and the drm-misc repo as
> > git
> > repo.
> >
> > Cheers, Daniel
>
> Thanks for looking into this Daniel. Currently there are no long term
> roadmap for this driver but it has to be in the upstream kernel.
>
> I'd like to contribute to drm-misc however I'd need some guidance in
> familiarizing myself with the tooling.

Ok, in that case just list yourself as reviewer (R: instead of M:) in
MAINTAINERS, but still including the drm-misc repo as the git repo
line. We can then work on ramping you up as full committer/maintainer
in drm-misc once you have more patches.

Cheers, Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

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