Date: Wed, 2 Dec 2015 16:33:31 +0100
From: Daniel Vetter <daniel@ffwll.ch>
To: Liviu Dudau <Liviu.Dudau@arm.com>, David Airlie <airlied@linux.ie>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>, Rob Herring <robh+dt@kernel.org>,
        Sudeep Holla <sudeep.holla@arm.com>, Jon Medhurst <tixy@linaro.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>, Rob Herring <robh@kernel.org>,
        Russell King <rmk+kernel@arm.linux.org.uk>,
        devicetree <devicetree@vger.kernel.org>,
        Pawel Moll <pawel.moll@arm.com>, Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Punit Agrawal <punit.agrawal@arm.com>,
        LKML <linux-kernel@vger.kernel.org>,
        DRI devel <dri-devel@lists.freedesktop.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Robin Murphy <robin.murphy@arm.com>,
        LAKML <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v3 2/4] drm: Add support for ARM's HDLCD controller.
Message-ID: <20151202153331.GE17050@phenom.ffwll.local>
Mail-Followup-To: Liviu Dudau <Liviu.Dudau@arm.com>,
	David Airlie <airlied@linux.ie>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>, Rob Herring <robh+dt@kernel.org>,
	Sudeep Holla <sudeep.holla@arm.com>, Jon Medhurst <tixy@linaro.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	Kumar Gala <galak@codeaurora.org>, Rob Herring <robh@kernel.org>,
	Russell King <rmk+kernel@arm.linux.org.uk>,
	devicetree <devicetree@vger.kernel.org>,
	Pawel Moll <pawel.moll@arm.com>, Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Punit Agrawal <punit.agrawal@arm.com>,
	LKML <linux-kernel@vger.kernel.org>,
	DRI devel <dri-devel@lists.freedesktop.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Robin Murphy <robin.murphy@arm.com>,
	LAKML <linux-arm-kernel@lists.infradead.org>
References: <1449058982-18595-1-git-send-email-Liviu.Dudau@arm.com>
 <1449058982-18595-3-git-send-email-Liviu.Dudau@arm.com>
 <20151202152419.GC17050@phenom.ffwll.local>
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On Wed, Dec 02, 2015 at 04:24:19PM +0100, Daniel Vetter wrote:
> On Wed, Dec 02, 2015 at 12:23:00PM +0000, Liviu Dudau wrote:
> > The HDLCD controller is a display controller that supports resolutions
> > up to 4096x4096 pixels. It is present on various development boards
> > produced by ARM Ltd and emulated by the latest Fast Models from the
> > company.
> > 
> > Cc: David Airlie <airlied@linux.ie>
> > Cc: Robin Murphy <robin.murphy@arm.com>
> > 
> > Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
> 
> A few small nitpicks below.

I've forgotten to add Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
with these all addressed.
-Daniel

> 
> > ---
> >  drivers/gpu/drm/Kconfig          |   2 +
> >  drivers/gpu/drm/Makefile         |   1 +
> >  drivers/gpu/drm/arm/Kconfig      |  29 ++
> >  drivers/gpu/drm/arm/Makefile     |   2 +
> >  drivers/gpu/drm/arm/hdlcd_crtc.c | 334 +++++++++++++++++++++++
> >  drivers/gpu/drm/arm/hdlcd_drv.c  | 555 +++++++++++++++++++++++++++++++++++++++
> >  drivers/gpu/drm/arm/hdlcd_drv.h  |  42 +++
> >  drivers/gpu/drm/arm/hdlcd_regs.h |  87 ++++++
> >  8 files changed, 1052 insertions(+)
> >  create mode 100644 drivers/gpu/drm/arm/Kconfig
> >  create mode 100644 drivers/gpu/drm/arm/Makefile
> >  create mode 100644 drivers/gpu/drm/arm/hdlcd_crtc.c
> >  create mode 100644 drivers/gpu/drm/arm/hdlcd_drv.c
> >  create mode 100644 drivers/gpu/drm/arm/hdlcd_drv.h
> >  create mode 100644 drivers/gpu/drm/arm/hdlcd_regs.h
> > 
> > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> > index c4bf9a1..3fd9124 100644
> > --- a/drivers/gpu/drm/Kconfig
> > +++ b/drivers/gpu/drm/Kconfig
> > @@ -106,6 +106,8 @@ config DRM_TDFX
> >  	  Choose this option if you have a 3dfx Banshee or Voodoo3 (or later),
> >  	  graphics card.  If M is selected, the module will be called tdfx.
> >  
> > +source "drivers/gpu/drm/arm/Kconfig"
> > +
> >  config DRM_R128
> >  	tristate "ATI Rage 128"
> >  	depends on DRM && PCI
> > diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> > index 1e9ff4c..6b42d75 100644
> > --- a/drivers/gpu/drm/Makefile
> > +++ b/drivers/gpu/drm/Makefile
> > @@ -35,6 +35,7 @@ CFLAGS_drm_trace_points.o := -I$(src)
> >  
> >  obj-$(CONFIG_DRM)	+= drm.o
> >  obj-$(CONFIG_DRM_MIPI_DSI) += drm_mipi_dsi.o
> > +obj-$(CONFIG_DRM_ARM)	+= arm/
> >  obj-$(CONFIG_DRM_TTM)	+= ttm/
> >  obj-$(CONFIG_DRM_TDFX)	+= tdfx/
> >  obj-$(CONFIG_DRM_R128)	+= r128/
> > diff --git a/drivers/gpu/drm/arm/Kconfig b/drivers/gpu/drm/arm/Kconfig
> > new file mode 100644
> > index 0000000..5e8c8a8
> > --- /dev/null
> > +++ b/drivers/gpu/drm/arm/Kconfig
> > @@ -0,0 +1,29 @@
> > +config DRM_ARM
> > +	bool "ARM Ltd. drivers"
> > +	depends on DRM && OF && (ARM || ARM64)
> > +	select DRM_KMS_HELPER
> > +	help
> > +	  Choose this option to select drivers for ARM's devices
> > +
> > +config DRM_HDLCD
> > +	tristate "ARM HDLCD"
> > +	depends on DRM_ARM
> > +	depends on COMMON_CLK
> > +	select COMMON_CLK_SCPI
> > +	select DMA_CMA
> > +	select DRM_KMS_CMA_HELPER
> > +	select DRM_GEM_CMA_HELPER
> > +	help
> > +	  Choose this option if you have an ARM High Definition Colour LCD
> > +	  controller.
> > +
> > +	  If M is selected the module will be called hdlcd.
> > +
> > +config DRM_HDLCD_SHOW_UNDERRUN
> > +	bool "Show underrun conditions"
> > +	depends on DRM_HDLCD
> > +	default n
> > +	help
> > +	  Enable this option to show in red colour the pixels that the
> > +	  HDLCD device did not fetch from framebuffer due to underrun
> > +	  conditions.
> > diff --git a/drivers/gpu/drm/arm/Makefile b/drivers/gpu/drm/arm/Makefile
> > new file mode 100644
> > index 0000000..89dcb7b
> > --- /dev/null
> > +++ b/drivers/gpu/drm/arm/Makefile
> > @@ -0,0 +1,2 @@
> > +hdlcd-y := hdlcd_drv.o hdlcd_crtc.o
> > +obj-$(CONFIG_DRM_HDLCD)	+= hdlcd.o
> > diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
> > new file mode 100644
> > index 0000000..350c1fe
> > --- /dev/null
> > +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
> > @@ -0,0 +1,334 @@
> > +/*
> > + * Copyright (C) 2013-2015 ARM Limited
> > + * Author: Liviu Dudau <Liviu.Dudau@arm.com>
> > + *
> > + * This file is subject to the terms and conditions of the GNU General Public
> > + * License.  See the file COPYING in the main directory of this archive
> > + * for more details.
> > + *
> > + *  Implementation of a CRTC class for the HDLCD driver.
> > + */
> > +
> > +#include <drm/drmP.h>
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_crtc.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_of.h>
> > +#include <drm/drm_plane_helper.h>
> > +#include <linux/clk.h>
> > +#include <linux/of_graph.h>
> > +#include <linux/platform_data/simplefb.h>
> > +#include <video/videomode.h>
> > +
> > +#include "hdlcd_drv.h"
> > +#include "hdlcd_regs.h"
> > +
> > +/*
> > + * The HDLCD controller is a dumb RGB streamer that gets connected to
> > + * a single HDMI transmitter or in the case of the ARM Models it gets
> > + * emulated by the software that does the actual rendering.
> > + *
> > + */
> > +
> > +static const struct drm_crtc_funcs hdlcd_crtc_funcs = {
> > +	.destroy = drm_crtc_cleanup,
> > +	.set_config = drm_atomic_helper_set_config,
> > +	.page_flip = drm_atomic_helper_page_flip,
> > +	.reset = drm_atomic_helper_crtc_reset,
> > +	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> > +	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> > +};
> > +
> > +static struct simplefb_format supported_formats[] = SIMPLEFB_FORMATS;
> > +
> > +/*
> > + * Setup the HDLCD registers for decoding the pixels out of the framebuffer
> > + */
> > +static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
> > +{
> > +	unsigned int btpp, default_color = 0x00000000;
> > +	struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> > +	uint32_t pixel_format;
> > +	struct simplefb_format *format = NULL;
> > +	int i;
> > +
> > +#ifdef CONFIG_DRM_HDLCD_SHOW_UNDERRUN
> > +	default_color = 0x00ff0000;	/* show underruns in red */
> > +#endif
> > +
> > +	if (!crtc->primary->state->fb) {
> > +		DRM_ERROR("No fb associated with state %p\n",
> > +			  crtc->primary->state);
> > +		return -EINVAL;
> 
> The higher-level ->mode_set_nofb can't fail and you're violating this
> here. Correct fix in atomic is to check in your crtc->atomic_check that
> there's always a primary fb set. Since that's a small dance (you need to
> grab the primary plane state first) might be good to extract it into a
> small helper, but not really needed.
> 
> Here you should WARN_ON if this ever happens and just return (without
> trying to track an error code), since it's too late already.
> 
> > +	}
> > +
> > +	pixel_format = crtc->primary->state->fb->pixel_format;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(supported_formats); i++) {
> > +		if (supported_formats[i].fourcc == pixel_format)
> > +			format = &supported_formats[i];
> > +	}
> > +
> > +	if (!format) {
> > +		DRM_ERROR("Format not supported: 0x%x\n", pixel_format);
> > +		return -EINVAL;
> > +	}
> 
> Same here. Although this should be impossible, with atomic the
> core/helpers pre-check the pixel format against the format table you
> register on the (primary) plane already. So just WARN_ON + bailing out.
> 
> > +
> > +	/* HDLCD uses 'bytes per pixel', zero means 1 byte */
> > +	btpp = (format->bits_per_pixel + 7) / 8;
> > +	hdlcd_write(hdlcd, HDLCD_REG_PIXEL_FORMAT, (btpp - 1) << 3);
> > +
> > +	/*
> > +	 * The format of the HDLCD_REG_<color>_SELECT register is:
> > +	 *   - bits[23:16] - default value for that color component
> > +	 *   - bits[11:8]  - number of bits to extract for each color component
> > +	 *   - bits[4:0]   - index of the lowest bit to extract
> > +	 *
> > +	 * The default color value is used when bits[11:8] are zero, when the
> > +	 * pixel is outside the visible frame area or when there is a
> > +	 * buffer underrun.
> > +	 */
> > +	hdlcd_write(hdlcd, HDLCD_REG_RED_SELECT, default_color |
> > +		format->red.offset | (format->red.length & 0xf) << 8);
> > +	hdlcd_write(hdlcd, HDLCD_REG_GREEN_SELECT, default_color |
> > +		format->green.offset | (format->green.length & 0xf) << 8);
> > +	hdlcd_write(hdlcd, HDLCD_REG_BLUE_SELECT, default_color |
> > +		format->blue.offset | (format->blue.length & 0xf) << 8);
> > +
> > +	return 0;
> > +}
> > +
> > +static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> > +	struct drm_display_mode *m = &crtc->state->adjusted_mode;
> > +	struct videomode vm;
> > +	unsigned int polarities, line_length, err;
> > +
> > +	vm.vfront_porch = m->crtc_vsync_start - m->crtc_vdisplay;
> > +	vm.vback_porch = m->crtc_vtotal - m->crtc_vsync_end;
> > +	vm.vsync_len = m->crtc_vsync_end - m->crtc_vsync_start;
> > +	vm.hfront_porch = m->crtc_hsync_start - m->crtc_hdisplay;
> > +	vm.hback_porch = m->crtc_htotal - m->crtc_hsync_end;
> > +	vm.hsync_len = m->crtc_hsync_end - m->crtc_hsync_start;
> > +
> > +	polarities = HDLCD_POLARITY_DATAEN | HDLCD_POLARITY_DATA;
> > +
> > +	if (m->flags & DRM_MODE_FLAG_PHSYNC)
> > +		polarities |= HDLCD_POLARITY_HSYNC;
> > +	if (m->flags & DRM_MODE_FLAG_PVSYNC)
> > +		polarities |= HDLCD_POLARITY_VSYNC;
> > +
> > +	line_length = crtc->primary->state->fb->pitches[0];
> > +
> > +	/* Allow max number of outstanding requests and largest burst size */
> > +	hdlcd_write(hdlcd, HDLCD_REG_BUS_OPTIONS,
> > +		    HDLCD_BUS_MAX_OUTSTAND | HDLCD_BUS_BURST_16);
> > +
> > +	hdlcd_write(hdlcd, HDLCD_REG_FB_LINE_LENGTH, line_length);
> > +	hdlcd_write(hdlcd, HDLCD_REG_FB_LINE_PITCH, line_length);
> > +	hdlcd_write(hdlcd, HDLCD_REG_FB_LINE_COUNT, m->crtc_vdisplay - 1);
> > +	hdlcd_write(hdlcd, HDLCD_REG_V_DATA, m->crtc_vdisplay - 1);
> > +	hdlcd_write(hdlcd, HDLCD_REG_V_BACK_PORCH, vm.vback_porch - 1);
> > +	hdlcd_write(hdlcd, HDLCD_REG_V_FRONT_PORCH, vm.vfront_porch - 1);
> > +	hdlcd_write(hdlcd, HDLCD_REG_V_SYNC, vm.vsync_len - 1);
> > +	hdlcd_write(hdlcd, HDLCD_REG_H_BACK_PORCH, vm.hback_porch - 1);
> > +	hdlcd_write(hdlcd, HDLCD_REG_H_FRONT_PORCH, vm.hfront_porch - 1);
> > +	hdlcd_write(hdlcd, HDLCD_REG_H_SYNC, vm.hsync_len - 1);
> > +	hdlcd_write(hdlcd, HDLCD_REG_H_DATA, m->crtc_hdisplay - 1);
> > +	hdlcd_write(hdlcd, HDLCD_REG_POLARITIES, polarities);
> > +
> > +	err = hdlcd_set_pxl_fmt(crtc);
> > +	if (err)
> > +		return;
> > +
> > +	clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
> > +}
> > +
> > +static void hdlcd_crtc_enable(struct drm_crtc *crtc)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> > +
> > +	clk_prepare_enable(hdlcd->clk);
> > +	hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
> > +	drm_crtc_vblank_on(crtc);
> > +}
> > +
> > +static void hdlcd_crtc_disable(struct drm_crtc *crtc)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> > +
> > +	if (!crtc->primary->fb)
> > +		return;
> > +
> > +	clk_disable_unprepare(hdlcd->clk);
> > +	hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 0);
> > +	drm_crtc_vblank_off(crtc);
> > +}
> > +
> > +static int hdlcd_crtc_atomic_check(struct drm_crtc *crtc,
> > +				   struct drm_crtc_state *state)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> > +	struct drm_display_mode *mode = &state->adjusted_mode;
> > +	long rate, clk_rate = mode->clock * 1000;
> > +
> > +	rate = clk_round_rate(hdlcd->clk, clk_rate);
> > +	if (rate != clk_rate) {
> > +		/* clock required by mode not supported by hardware */
> > +		return -EINVAL;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static void hdlcd_crtc_atomic_begin(struct drm_crtc *crtc,
> > +				    struct drm_crtc_state *state)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
> > +	unsigned long flags;
> > +
> > +	if (crtc->state->event) {
> > +		crtc->state->event->pipe = drm_crtc_index(crtc);
> > +
> > +		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
> > +
> > +		spin_lock_irqsave(&crtc->dev->event_lock, flags);
> > +		hdlcd->event = crtc->state->event;
> > +		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
> > +		crtc->state->event = NULL;
> > +	}
> > +}
> > +
> > +static void hdlcd_crtc_atomic_flush(struct drm_crtc *crtc,
> > +				    struct drm_crtc_state *state)
> > +{
> > +}
> > +
> > +static bool hdlcd_crtc_mode_fixup(struct drm_crtc *crtc,
> > +			const struct drm_display_mode *mode,
> > +			struct drm_display_mode *adjusted_mode)
> > +{
> > +	return true;
> > +}
> > +
> > +static const struct drm_crtc_helper_funcs hdlcd_crtc_helper_funcs = {
> > +	.mode_fixup	= hdlcd_crtc_mode_fixup,
> > +	.mode_set	= drm_helper_crtc_mode_set,
> > +	.mode_set_base	= drm_helper_crtc_mode_set_base,
> > +	.mode_set_nofb	= hdlcd_crtc_mode_set_nofb,
> > +	.enable		= hdlcd_crtc_enable,
> > +	.disable	= hdlcd_crtc_disable,
> > +	.prepare	= hdlcd_crtc_disable,
> > +	.commit		= hdlcd_crtc_enable,
> > +	.atomic_check	= hdlcd_crtc_atomic_check,
> > +	.atomic_begin	= hdlcd_crtc_atomic_begin,
> > +	.atomic_flush	= hdlcd_crtc_atomic_flush,
> > +};
> > +
> > +static int hdlcd_plane_atomic_check(struct drm_plane *plane,
> > +				    struct drm_plane_state *state)
> > +{
> > +	return 0;
> > +}
> > +
> > +static void hdlcd_plane_atomic_update(struct drm_plane *plane,
> > +				      struct drm_plane_state *state)
> > +{
> > +	struct hdlcd_drm_private *hdlcd;
> > +	struct drm_gem_cma_object *gem;
> > +	dma_addr_t scanout_start;
> > +
> > +	if (!plane->state->crtc || !plane->state->fb)
> > +		return;
> > +
> > +	hdlcd = crtc_to_hdlcd_priv(plane->state->crtc);
> > +	gem = drm_fb_cma_get_gem_obj(plane->state->fb, 0);
> > +	scanout_start = gem->paddr;
> > +	hdlcd_write(hdlcd, HDLCD_REG_FB_BASE, scanout_start);
> > +}
> > +
> > +static const struct drm_plane_helper_funcs hdlcd_plane_helper_funcs = {
> > +	.prepare_fb = NULL,
> > +	.cleanup_fb = NULL,
> > +	.atomic_check = hdlcd_plane_atomic_check,
> > +	.atomic_update = hdlcd_plane_atomic_update,
> > +};
> > +
> > +static void hdlcd_plane_destroy(struct drm_plane *plane)
> > +{
> > +	drm_plane_helper_disable(plane);
> > +	drm_plane_cleanup(plane);
> > +}
> > +
> > +static const struct drm_plane_funcs hdlcd_plane_funcs = {
> > +	.update_plane		= drm_atomic_helper_update_plane,
> > +	.disable_plane		= drm_atomic_helper_disable_plane,
> > +	.destroy		= hdlcd_plane_destroy,
> > +	.reset			= drm_atomic_helper_plane_reset,
> > +	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
> > +	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
> > +};
> > +
> > +static struct drm_plane *hdlcd_plane_init(struct drm_device *drm)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +	struct drm_plane *plane = NULL;
> > +	u32 formats[ARRAY_SIZE(supported_formats)], i;
> > +	int ret;
> > +
> > +	plane = devm_kzalloc(drm->dev, sizeof(*plane), GFP_KERNEL);
> > +	if (!plane)
> > +		return ERR_PTR(-ENOMEM);
> > +
> > +	for (i = 0; i < ARRAY_SIZE(supported_formats); i++)
> > +		formats[i] = supported_formats[i].fourcc;
> > +
> > +	ret = drm_universal_plane_init(drm, plane, 0xff, &hdlcd_plane_funcs,
> > +				       formats, ARRAY_SIZE(formats),
> > +				       DRM_PLANE_TYPE_PRIMARY);
> > +	if (ret) {
> > +		devm_kfree(drm->dev, plane);
> > +		return ERR_PTR(ret);
> > +	}
> > +
> > +	drm_plane_helper_add(plane, &hdlcd_plane_helper_funcs);
> > +	hdlcd->plane = plane;
> > +
> > +	return plane;
> > +}
> > +
> > +void hdlcd_crtc_suspend(struct drm_crtc *crtc)
> > +{
> > +	hdlcd_crtc_disable(crtc);
> > +}
> > +
> > +void hdlcd_crtc_resume(struct drm_crtc *crtc)
> > +{
> > +	hdlcd_crtc_enable(crtc);
> > +}
> > +
> > +int hdlcd_setup_crtc(struct drm_device *drm)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +	struct drm_plane *primary;
> > +	int ret;
> > +
> > +	primary = hdlcd_plane_init(drm);
> > +	if (IS_ERR(primary))
> > +		return PTR_ERR(primary);
> > +
> > +	ret = drm_crtc_init_with_planes(drm, &hdlcd->crtc, primary, NULL,
> > +					&hdlcd_crtc_funcs);
> > +	if (ret) {
> > +		hdlcd_plane_destroy(primary);
> > +		devm_kfree(drm->dev, primary);
> > +		return ret;
> > +	}
> > +
> > +	drm_crtc_helper_add(&hdlcd->crtc, &hdlcd_crtc_helper_funcs);
> > +	return 0;
> > +}
> > diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
> > new file mode 100644
> > index 0000000..45440b1
> > --- /dev/null
> > +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> > @@ -0,0 +1,555 @@
> > +/*
> > + * Copyright (C) 2013-2015 ARM Limited
> > + * Author: Liviu Dudau <Liviu.Dudau@arm.com>
> > + *
> > + * This file is subject to the terms and conditions of the GNU General Public
> > + * License.  See the file COPYING in the main directory of this archive
> > + * for more details.
> > + *
> > + *  ARM HDLCD Driver
> > + */
> > +
> > +#include <linux/module.h>
> > +#include <linux/spinlock.h>
> > +#include <linux/clk.h>
> > +#include <linux/component.h>
> > +#include <linux/of_graph.h>
> > +#include <linux/of_reserved_mem.h>
> > +#include <linux/pm_runtime.h>
> > +
> > +#include <drm/drmP.h>
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_crtc.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_of.h>
> > +
> > +#include "hdlcd_drv.h"
> > +#include "hdlcd_regs.h"
> > +
> > +static int compare_dev(struct device *dev, void *data)
> > +{
> > +	return dev->of_node == data;
> > +}
> > +
> > +static int hdlcd_load(struct drm_device *drm, unsigned long flags)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +	struct platform_device *pdev = to_platform_device(drm->dev);
> > +	struct resource *res;
> > +	u32 version;
> > +	int ret;
> > +
> > +	hdlcd->clk = devm_clk_get(drm->dev, "pxlclk");
> > +	if (IS_ERR(hdlcd->clk))
> > +		return PTR_ERR(hdlcd->clk);
> > +
> > +#ifdef CONFIG_DEBUG_FS
> > +	atomic_set(&hdlcd->buffer_underrun_count, 0);
> > +	atomic_set(&hdlcd->bus_error_count, 0);
> > +	atomic_set(&hdlcd->vsync_count, 0);
> > +	atomic_set(&hdlcd->dma_end_count, 0);
> > +#endif
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	hdlcd->mmio = devm_ioremap_resource(drm->dev, res);
> > +	if (IS_ERR(hdlcd->mmio)) {
> > +		DRM_ERROR("failed to map control registers area\n");
> > +		ret = PTR_ERR(hdlcd->mmio);
> > +		hdlcd->mmio = NULL;
> > +		goto fail;
> > +	}
> > +
> > +	version = hdlcd_read(hdlcd, HDLCD_REG_VERSION);
> > +	if ((version & HDLCD_PRODUCT_MASK) != HDLCD_PRODUCT_ID) {
> > +		DRM_ERROR("unknown product id: 0x%x\n", version);
> > +		ret = -EINVAL;
> > +		goto fail;
> > +	}
> > +	DRM_INFO("found ARM HDLCD version r%dp%d\n",
> > +		(version & HDLCD_VERSION_MAJOR_MASK) >> 8,
> > +		version & HDLCD_VERSION_MINOR_MASK);
> > +
> > +	/* Get the optional framebuffer memory resource */
> > +	ret = of_reserved_mem_device_init(drm->dev);
> > +	if (ret && ret != -ENODEV)
> > +		goto fail;
> > +
> > +	ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
> > +	if (ret)
> > +		goto setup_fail;
> > +
> > +	ret = hdlcd_setup_crtc(drm);
> > +	if (ret < 0) {
> > +		DRM_ERROR("failed to create crtc\n");
> > +		goto setup_fail;
> > +	}
> > +
> > +	pm_runtime_enable(drm->dev);
> > +
> > +	pm_runtime_get_sync(drm->dev);
> > +	ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
> > +	pm_runtime_put_sync(drm->dev);
> > +	if (ret < 0) {
> > +		DRM_ERROR("failed to install IRQ handler\n");
> > +		goto irq_fail;
> > +	}
> > +
> > +	return 0;
> > +
> > +irq_fail:
> > +	drm_crtc_cleanup(&hdlcd->crtc);
> > +setup_fail:
> > +	of_reserved_mem_device_release(drm->dev);
> > +fail:
> > +	devm_clk_put(drm->dev, hdlcd->clk);
> > +
> > +	return ret;
> > +}
> > +
> > +static void hdlcd_fb_output_poll_changed(struct drm_device *drm)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +
> > +	if (hdlcd->fbdev) {
> > +		drm_fbdev_cma_hotplug_event(hdlcd->fbdev);
> > +	}
> > +}
> > +
> > +static const struct drm_mode_config_funcs hdlcd_mode_config_funcs = {
> > +	.fb_create = drm_fb_cma_create,
> > +	.output_poll_changed = hdlcd_fb_output_poll_changed,
> > +	.atomic_check = drm_atomic_helper_check,
> > +	.atomic_commit = drm_atomic_helper_commit,
> > +};
> > +
> > +static void hdlcd_setup_mode_config(struct drm_device *drm)
> > +{
> > +	drm_mode_config_init(drm);
> > +	drm->mode_config.min_width = 0;
> > +	drm->mode_config.min_height = 0;
> > +	drm->mode_config.max_width = HDLCD_MAX_XRES;
> > +	drm->mode_config.max_height = HDLCD_MAX_YRES;
> > +	drm->mode_config.funcs = &hdlcd_mode_config_funcs;
> > +}
> > +
> > +static void hdlcd_preclose(struct drm_device *drm, struct drm_file *file)
> > +{
> > +}
> > +
> > +static void hdlcd_lastclose(struct drm_device *drm)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +
> > +	drm_fbdev_cma_restore_mode(hdlcd->fbdev);
> > +}
> > +
> > +static irqreturn_t hdlcd_irq(int irq, void *arg)
> > +{
> > +	struct drm_device *drm = arg;
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +	unsigned long irq_status;
> > +
> > +	irq_status = hdlcd_read(hdlcd, HDLCD_REG_INT_STATUS);
> > +
> > +#ifdef CONFIG_DEBUG_FS
> > +	if (irq_status & HDLCD_INTERRUPT_UNDERRUN) {
> > +		atomic_inc(&hdlcd->buffer_underrun_count);
> > +	}
> > +	if (irq_status & HDLCD_INTERRUPT_DMA_END) {
> > +		atomic_inc(&hdlcd->dma_end_count);
> > +	}
> > +	if (irq_status & HDLCD_INTERRUPT_BUS_ERROR) {
> > +		atomic_inc(&hdlcd->bus_error_count);
> > +	}
> > +	if (irq_status & HDLCD_INTERRUPT_VSYNC) {
> > +		atomic_inc(&hdlcd->vsync_count);
> > +	}
> > +#endif
> > +	if (irq_status & HDLCD_INTERRUPT_VSYNC) {
> > +		unsigned long flags;
> > +
> > +		drm_handle_vblank(drm, 0);
> 
> We have drm_crtc_ versions for this one ...
> > +
> > +		spin_lock_irqsave(&drm->event_lock, flags);
> > +		if (hdlcd->event) {
> > +			drm_send_vblank_event(drm, hdlcd->event->pipe, hdlcd->event);
> 
> and this one now too. New drivers shouldn't need to deal with the opaque
> int pipe stuff any more on the caller sides, and real soon (hopefully)
> we'll have hooks for the vblank stuff that take struct drm_crtc * too.
> 
> I've quickly scrolled through the driver otherwise and didn't notice
> anything else that should be updated to latest practices. Looks really
> good.
> -Daniel
> 
> > +			drm_crtc_vblank_put(&hdlcd->crtc);
> > +			hdlcd->event = NULL;
> > +		}
> > +		spin_unlock_irqrestore(&drm->event_lock, flags);
> > +	}
> > +
> > +	/* acknowledge interrupt(s) */
> > +	hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR, irq_status);
> > +
> > +	return IRQ_HANDLED;
> > +}
> > +
> > +static void hdlcd_irq_preinstall(struct drm_device *drm)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +	/* Ensure interrupts are disabled */
> > +	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, 0);
> > +	hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR, ~0);
> > +}
> > +
> > +static int hdlcd_irq_postinstall(struct drm_device *drm)
> > +{
> > +#ifdef CONFIG_DEBUG_FS
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +	unsigned long irq_mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
> > +
> > +	/* enable debug interrupts */
> > +	irq_mask |= HDLCD_DEBUG_INT_MASK;
> > +
> > +	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, irq_mask);
> > +#endif
> > +	return 0;
> > +}
> > +
> > +static void hdlcd_irq_uninstall(struct drm_device *drm)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +	/* disable all the interrupts that we might have enabled */
> > +	unsigned long irq_mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
> > +
> > +#ifdef CONFIG_DEBUG_FS
> > +	/* disable debug interrupts */
> > +	irq_mask &= ~HDLCD_DEBUG_INT_MASK;
> > +#endif
> > +
> > +	/* disable vsync interrupts */
> > +	irq_mask &= ~HDLCD_INTERRUPT_VSYNC;
> > +
> > +	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, irq_mask);
> > +}
> > +
> > +static int hdlcd_enable_vblank(struct drm_device *drm, unsigned int crtc)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +	unsigned int mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
> > +
> > +	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, mask | HDLCD_INTERRUPT_VSYNC);
> > +
> > +	return 0;
> > +}
> > +
> > +static void hdlcd_disable_vblank(struct drm_device *drm, unsigned int crtc)
> > +{
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +	unsigned int mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
> > +
> > +	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, mask & ~HDLCD_INTERRUPT_VSYNC);
> > +}
> > +
> > +#ifdef CONFIG_DEBUG_FS
> > +static int hdlcd_show_underrun_count(struct seq_file *m, void *arg)
> > +{
> > +	struct drm_info_node *node = (struct drm_info_node *)m->private;
> > +	struct drm_device *drm = node->minor->dev;
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +
> > +	seq_printf(m, "underrun : %d\n", atomic_read(&hdlcd->buffer_underrun_count));
> > +	seq_printf(m, "dma_end  : %d\n", atomic_read(&hdlcd->dma_end_count));
> > +	seq_printf(m, "bus_error: %d\n", atomic_read(&hdlcd->bus_error_count));
> > +	seq_printf(m, "vsync    : %d\n", atomic_read(&hdlcd->vsync_count));
> > +	return 0;
> > +}
> > +
> > +static int hdlcd_show_pxlclock(struct seq_file *m, void *arg)
> > +{
> > +	struct drm_info_node *node = (struct drm_info_node *)m->private;
> > +	struct drm_device *drm = node->minor->dev;
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +	unsigned long clkrate = clk_get_rate(hdlcd->clk);
> > +	unsigned long mode_clock = hdlcd->crtc.mode.crtc_clock * 1000;
> > +
> > +	seq_printf(m, "hw  : %lu\n", clkrate);
> > +	seq_printf(m, "mode: %lu\n", mode_clock);
> > +	return 0;
> > +}
> > +
> > +static struct drm_info_list hdlcd_debugfs_list[] = {
> > +	{ "interrupt_count", hdlcd_show_underrun_count, 0 },
> > +	{ "clocks", hdlcd_show_pxlclock, 0 },
> > +};
> > +
> > +static int hdlcd_debugfs_init(struct drm_minor *minor)
> > +{
> > +	return drm_debugfs_create_files(hdlcd_debugfs_list,
> > +		ARRAY_SIZE(hdlcd_debugfs_list),	minor->debugfs_root, minor);
> > +}
> > +
> > +static void hdlcd_debugfs_cleanup(struct drm_minor *minor)
> > +{
> > +	drm_debugfs_remove_files(hdlcd_debugfs_list,
> > +		ARRAY_SIZE(hdlcd_debugfs_list), minor);
> > +}
> > +#endif
> > +
> > +static const struct file_operations fops = {
> > +	.owner		= THIS_MODULE,
> > +	.open		= drm_open,
> > +	.release	= drm_release,
> > +	.unlocked_ioctl	= drm_ioctl,
> > +#ifdef CONFIG_COMPAT
> > +	.compat_ioctl	= drm_compat_ioctl,
> > +#endif
> > +	.poll		= drm_poll,
> > +	.read		= drm_read,
> > +	.llseek		= noop_llseek,
> > +	.mmap		= drm_gem_cma_mmap,
> > +};
> > +
> > +static struct drm_driver hdlcd_driver = {
> > +	.driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM |
> > +			   DRIVER_MODESET | DRIVER_PRIME |
> > +			   DRIVER_ATOMIC,
> > +	.preclose = hdlcd_preclose,
> > +	.lastclose = hdlcd_lastclose,
> > +	.irq_handler = hdlcd_irq,
> > +	.irq_preinstall = hdlcd_irq_preinstall,
> > +	.irq_postinstall = hdlcd_irq_postinstall,
> > +	.irq_uninstall = hdlcd_irq_uninstall,
> > +	.get_vblank_counter = drm_vblank_no_hw_counter,
> > +	.enable_vblank = hdlcd_enable_vblank,
> > +	.disable_vblank = hdlcd_disable_vblank,
> > +	.gem_free_object = drm_gem_cma_free_object,
> > +	.gem_vm_ops = &drm_gem_cma_vm_ops,
> > +	.dumb_create = drm_gem_cma_dumb_create,
> > +	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
> > +	.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,
> > +#ifdef CONFIG_DEBUG_FS
> > +	.debugfs_init = hdlcd_debugfs_init,
> > +	.debugfs_cleanup = hdlcd_debugfs_cleanup,
> > +#endif
> > +	.fops = &fops,
> > +	.name = "hdlcd",
> > +	.desc = "ARM HDLCD Controller DRM",
> > +	.date = "20151021",
> > +	.major = 1,
> > +	.minor = 0,
> > +};
> > +
> > +static int hdlcd_add_components(struct device *dev, struct master *master)
> > +{
> > +	struct device_node *port, *ep = NULL;
> > +	int ret = -ENXIO;
> > +
> > +	if (!dev->of_node)
> > +		return -ENODEV;
> > +
> > +	do {
> > +		ep = of_graph_get_next_endpoint(dev->of_node, ep);
> > +		if (!ep)
> > +			break;
> > +
> > +		if (!of_device_is_available(ep)) {
> > +			of_node_put(ep);
> > +			continue;
> > +		}
> > +
> > +		port = of_graph_get_remote_port_parent(ep);
> > +		of_node_put(ep);
> > +		if (!port || !of_device_is_available(port)) {
> > +			of_node_put(port);
> > +			continue;
> > +		}
> > +
> > +		ret = component_master_add_child(master, compare_dev, port);
> > +		of_node_put(port);
> > +	} while (1);
> > +
> > +	return ret;
> > +}
> > +
> > +static int hdlcd_drm_bind(struct device *dev)
> > +{
> > +	struct drm_device *drm;
> > +	struct hdlcd_drm_private *hdlcd;
> > +	int ret;
> > +
> > +	hdlcd = devm_kzalloc(dev, sizeof(*hdlcd), GFP_KERNEL);
> > +	if (!hdlcd)
> > +		return -ENOMEM;
> > +
> > +	drm = drm_dev_alloc(&hdlcd_driver, dev);
> > +	if (!drm)
> > +		return -ENOMEM;
> > +
> > +	drm->dev_private = hdlcd;
> > +
> > +	ret = drm_dev_set_unique(drm, "%s", dev_name(dev));
> > +	if (ret)
> > +		goto err_free;
> > +
> > +	hdlcd_setup_mode_config(drm);
> > +
> > +	ret = hdlcd_load(drm, 0);
> > +	if (ret)
> > +		goto err_free;
> > +
> > +	ret = drm_dev_register(drm, 0);
> > +	if (ret)
> > +		goto err_unload;
> > +
> > +	dev_set_drvdata(dev, drm);
> > +
> > +	ret = component_bind_all(dev, drm);
> > +	if (ret) {
> > +		DRM_ERROR("Failed to bind all components\n");
> > +		goto err_unregister;
> > +	}
> > +
> > +	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
> > +	if (ret < 0) {
> > +		DRM_ERROR("failed to initialise vblank\n");
> > +		goto err_vblank;
> > +	}
> > +	drm->vblank_disable_allowed = true;
> > +
> > +	drm_mode_config_reset(drm);
> > +	drm_kms_helper_poll_init(drm);
> > +
> > +	hdlcd->fbdev = drm_fbdev_cma_init(drm, 32, drm->mode_config.num_crtc,
> > +					  drm->mode_config.num_connector);
> > +
> > +	if (IS_ERR(hdlcd->fbdev)) {
> > +		ret = PTR_ERR(hdlcd->fbdev);
> > +		hdlcd->fbdev = NULL;
> > +		goto err_fbdev;
> > +	}
> > +
> > +	return 0;
> > +
> > +err_fbdev:
> > +	drm_kms_helper_poll_fini(drm);
> > +	drm_mode_config_cleanup(drm);
> > +	drm_vblank_cleanup(drm);
> > +err_vblank:
> > +	component_unbind_all(dev, drm);
> > +err_unregister:
> > +	drm_dev_unregister(drm);
> > +err_unload:
> > +	pm_runtime_get_sync(drm->dev);
> > +	drm_irq_uninstall(drm);
> > +	pm_runtime_put_sync(drm->dev);
> > +	pm_runtime_disable(drm->dev);
> > +	of_reserved_mem_device_release(drm->dev);
> > +	devm_clk_put(dev, hdlcd->clk);
> > +err_free:
> > +	drm_dev_unref(drm);
> > +
> > +	return ret;
> > +}
> > +
> > +static void hdlcd_drm_unbind(struct device *dev)
> > +{
> > +	struct drm_device *drm = dev_get_drvdata(dev);
> > +	struct hdlcd_drm_private *hdlcd = drm->dev_private;
> > +
> > +	if (hdlcd->fbdev) {
> > +		drm_fbdev_cma_fini(hdlcd->fbdev);
> > +		hdlcd->fbdev = NULL;
> > +	}
> > +	drm_kms_helper_poll_fini(drm);
> > +	component_unbind_all(dev, drm);
> > +	drm_vblank_cleanup(drm);
> > +	pm_runtime_get_sync(drm->dev);
> > +	drm_irq_uninstall(drm);
> > +	pm_runtime_put_sync(drm->dev);
> > +	pm_runtime_disable(drm->dev);
> > +	of_reserved_mem_device_release(drm->dev);
> > +	if (!IS_ERR(hdlcd->clk)) {
> > +		devm_clk_put(drm->dev, hdlcd->clk);
> > +		hdlcd->clk = NULL;
> > +	}
> > +	drm_mode_config_cleanup(drm);
> > +	drm_dev_unregister(drm);
> > +	drm_dev_unref(drm);
> > +	drm->dev_private = NULL;
> > +	dev_set_drvdata(dev, NULL);
> > +}
> > +
> > +static const struct component_master_ops hdlcd_master_ops = {
> > +	.add_components	= hdlcd_add_components,
> > +	.bind		= hdlcd_drm_bind,
> > +	.unbind		= hdlcd_drm_unbind,
> > +};
> > +
> > +static int hdlcd_probe(struct platform_device *pdev)
> > +{
> > +	return component_master_add(&pdev->dev, &hdlcd_master_ops);
> > +}
> > +
> > +static int hdlcd_remove(struct platform_device *pdev)
> > +{
> > +	component_master_del(&pdev->dev, &hdlcd_master_ops);
> > +	return 0;
> > +}
> > +
> > +static const struct of_device_id  hdlcd_of_match[] = {
> > +	{ .compatible	= "arm,hdlcd" },
> > +	{},
> > +};
> > +MODULE_DEVICE_TABLE(of, hdlcd_of_match);
> > +
> > +static int hdlcd_pm_suspend(struct device *dev)
> > +{
> > +	struct drm_device *drm = dev_get_drvdata(dev);
> > +	struct drm_crtc *crtc;
> > +
> > +	if (pm_runtime_suspended(dev))
> > +		return 0;
> > +
> > +	drm_modeset_lock_all(drm);
> > +	list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
> > +		hdlcd_crtc_suspend(crtc);
> > +	drm_modeset_unlock_all(drm);
> > +	return 0;
> > +}
> > +
> > +static int hdlcd_pm_resume(struct device *dev)
> > +{
> > +	struct drm_device *drm = dev_get_drvdata(dev);
> > +	struct drm_crtc *crtc;
> > +
> > +	if (!pm_runtime_suspended(dev))
> > +		return 0;
> > +
> > +	drm_modeset_lock_all(drm);
> > +	list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
> > +		hdlcd_crtc_resume(crtc);
> > +	drm_modeset_unlock_all(drm);
> > +	return 0;
> > +}
> > +
> > +static SIMPLE_DEV_PM_OPS(hdlcd_pm_ops, hdlcd_pm_suspend, hdlcd_pm_resume);
> > +
> > +static struct platform_driver hdlcd_platform_driver = {
> > +	.probe		= hdlcd_probe,
> > +	.remove		= hdlcd_remove,
> > +	.driver	= {
> > +		.name = "hdlcd",
> > +		.pm = &hdlcd_pm_ops,
> > +		.of_match_table	= hdlcd_of_match,
> > +	},
> > +};
> > +
> > +module_platform_driver(hdlcd_platform_driver);
> > +
> > +MODULE_AUTHOR("Liviu Dudau");
> > +MODULE_DESCRIPTION("ARM HDLCD DRM driver");
> > +MODULE_LICENSE("GPL v2");
> > diff --git a/drivers/gpu/drm/arm/hdlcd_drv.h b/drivers/gpu/drm/arm/hdlcd_drv.h
> > new file mode 100644
> > index 0000000..f2eedfb
> > --- /dev/null
> > +++ b/drivers/gpu/drm/arm/hdlcd_drv.h
> > @@ -0,0 +1,42 @@
> > +/*
> > + *  ARM HDLCD Controller register definition
> > + */
> > +
> > +#ifndef __HDLCD_DRV_H__
> > +#define __HDLCD_DRV_H__
> > +
> > +struct hdlcd_drm_private {
> > +	void __iomem			*mmio;
> > +	struct clk			*clk;
> > +	struct drm_fbdev_cma		*fbdev;
> > +	struct drm_framebuffer		*fb;
> > +	struct drm_pending_vblank_event	*event;
> > +	struct drm_crtc			crtc;
> > +	struct drm_plane		*plane;
> > +#ifdef CONFIG_DEBUG_FS
> > +	atomic_t buffer_underrun_count;
> > +	atomic_t bus_error_count;
> > +	atomic_t vsync_count;
> > +	atomic_t dma_end_count;
> > +#endif
> > +};
> > +
> > +#define crtc_to_hdlcd_priv(x)	container_of(x, struct hdlcd_drm_private, crtc)
> > +
> > +static inline void hdlcd_write(struct hdlcd_drm_private *hdlcd,
> > +			       unsigned int reg, u32 value)
> > +{
> > +	writel(value, hdlcd->mmio + reg);
> > +}
> > +
> > +static inline u32 hdlcd_read(struct hdlcd_drm_private *hdlcd, unsigned int reg)
> > +{
> > +	return readl(hdlcd->mmio + reg);
> > +}
> > +
> > +int hdlcd_setup_crtc(struct drm_device *dev);
> > +void hdlcd_set_scanout(struct hdlcd_drm_private *hdlcd);
> > +void hdlcd_crtc_suspend(struct drm_crtc *crtc);
> > +void hdlcd_crtc_resume(struct drm_crtc *crtc);
> > +
> > +#endif /* __HDLCD_DRV_H__ */
> > diff --git a/drivers/gpu/drm/arm/hdlcd_regs.h b/drivers/gpu/drm/arm/hdlcd_regs.h
> > new file mode 100644
> > index 0000000..66799eb
> > --- /dev/null
> > +++ b/drivers/gpu/drm/arm/hdlcd_regs.h
> > @@ -0,0 +1,87 @@
> > +/*
> > + * Copyright (C) 2013,2014 ARM Limited
> > + *
> > + * This file is subject to the terms and conditions of the GNU General Public
> > + * License.  See the file COPYING in the main directory of this archive
> > + * for more details.
> > + *
> > + *  ARM HDLCD Controller register definition
> > + */
> > +
> > +#ifndef __HDLCD_REGS_H__
> > +#define __HDLCD_REGS_H__
> > +
> > +/* register offsets */
> > +#define HDLCD_REG_VERSION		0x0000	/* ro */
> > +#define HDLCD_REG_INT_RAWSTAT		0x0010	/* rw */
> > +#define HDLCD_REG_INT_CLEAR		0x0014	/* wo */
> > +#define HDLCD_REG_INT_MASK		0x0018	/* rw */
> > +#define HDLCD_REG_INT_STATUS		0x001c	/* ro */
> > +#define HDLCD_REG_FB_BASE		0x0100	/* rw */
> > +#define HDLCD_REG_FB_LINE_LENGTH	0x0104	/* rw */
> > +#define HDLCD_REG_FB_LINE_COUNT		0x0108	/* rw */
> > +#define HDLCD_REG_FB_LINE_PITCH		0x010c	/* rw */
> > +#define HDLCD_REG_BUS_OPTIONS		0x0110	/* rw */
> > +#define HDLCD_REG_V_SYNC		0x0200	/* rw */
> > +#define HDLCD_REG_V_BACK_PORCH		0x0204	/* rw */
> > +#define HDLCD_REG_V_DATA		0x0208	/* rw */
> > +#define HDLCD_REG_V_FRONT_PORCH		0x020c	/* rw */
> > +#define HDLCD_REG_H_SYNC		0x0210	/* rw */
> > +#define HDLCD_REG_H_BACK_PORCH		0x0214	/* rw */
> > +#define HDLCD_REG_H_DATA		0x0218	/* rw */
> > +#define HDLCD_REG_H_FRONT_PORCH		0x021c	/* rw */
> > +#define HDLCD_REG_POLARITIES		0x0220	/* rw */
> > +#define HDLCD_REG_COMMAND		0x0230	/* rw */
> > +#define HDLCD_REG_PIXEL_FORMAT		0x0240	/* rw */
> > +#define HDLCD_REG_RED_SELECT		0x0244	/* rw */
> > +#define HDLCD_REG_GREEN_SELECT		0x0248	/* rw */
> > +#define HDLCD_REG_BLUE_SELECT		0x024c	/* rw */
> > +
> > +/* version */
> > +#define HDLCD_PRODUCT_ID		0x1CDC0000
> > +#define HDLCD_PRODUCT_MASK		0xFFFF0000
> > +#define HDLCD_VERSION_MAJOR_MASK	0x0000FF00
> > +#define HDLCD_VERSION_MINOR_MASK	0x000000FF
> > +
> > +/* interrupts */
> > +#define HDLCD_INTERRUPT_DMA_END		(1 << 0)
> > +#define HDLCD_INTERRUPT_BUS_ERROR	(1 << 1)
> > +#define HDLCD_INTERRUPT_VSYNC		(1 << 2)
> > +#define HDLCD_INTERRUPT_UNDERRUN	(1 << 3)
> > +#define HDLCD_DEBUG_INT_MASK		(HDLCD_INTERRUPT_DMA_END |  \
> > +					HDLCD_INTERRUPT_BUS_ERROR | \
> > +					HDLCD_INTERRUPT_UNDERRUN)
> > +
> > +/* polarities */
> > +#define HDLCD_POLARITY_VSYNC		(1 << 0)
> > +#define HDLCD_POLARITY_HSYNC		(1 << 1)
> > +#define HDLCD_POLARITY_DATAEN		(1 << 2)
> > +#define HDLCD_POLARITY_DATA		(1 << 3)
> > +#define HDLCD_POLARITY_PIXELCLK		(1 << 4)
> > +
> > +/* commands */
> > +#define HDLCD_COMMAND_DISABLE		(0 << 0)
> > +#define HDLCD_COMMAND_ENABLE		(1 << 0)
> > +
> > +/* pixel format */
> > +#define HDLCD_PIXEL_FMT_LITTLE_ENDIAN	(0 << 31)
> > +#define HDLCD_PIXEL_FMT_BIG_ENDIAN	(1 << 31)
> > +#define HDLCD_BYTES_PER_PIXEL_MASK	(3 << 3)
> > +
> > +/* bus options */
> > +#define HDLCD_BUS_BURST_MASK		0x01f
> > +#define HDLCD_BUS_MAX_OUTSTAND		0xf00
> > +#define HDLCD_BUS_BURST_NONE		(0 << 0)
> > +#define HDLCD_BUS_BURST_1		(1 << 0)
> > +#define HDLCD_BUS_BURST_2		(1 << 1)
> > +#define HDLCD_BUS_BURST_4		(1 << 2)
> > +#define HDLCD_BUS_BURST_8		(1 << 3)
> > +#define HDLCD_BUS_BURST_16		(1 << 4)
> > +
> > +/* Max resolution supported is 4096x4096, 32bpp */
> > +#define HDLCD_MAX_XRES			4096
> > +#define HDLCD_MAX_YRES			4096
> > +
> > +#define NR_PALETTE			256
> > +
> > +#endif /* __HDLCD_REGS_H__ */
> > -- 
> > 2.6.2
> > 
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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