Re: [PATCH v2 2/2] drm: zte: add initial vou drm driver

Daniel Vetter
2016-09-25T20:58:09Z

On Sat, Sep 24, 2016 at 10:26:25PM +0800, Shawn Guo wrote:
> It adds the initial ZTE VOU display controller DRM driver. There are
> still some features to be added, like overlay plane, scaling, and more
> output devices support. But it's already useful with dual CRTCs and
> HDMI monitor working.
>
> It's been tested on Debian Jessie LXDE desktop with modesetting driver.
>
> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

I've done a very quick read-through, looks real pretty. A few comments
below and in-line.

For testing, have you tried to run i-g-t validation tests per our
documentation? See https://dri.freedesktop.org/docs/drm/gpu/drm-uapi.html#validating-changes-with-igt

Cheers, Daniel

> ---
> drivers/gpu/drm/Kconfig | 2 +
> drivers/gpu/drm/Makefile | 1 +
> drivers/gpu/drm/zte/Kconfig | 8 +
> drivers/gpu/drm/zte/Makefile | 8 +
> drivers/gpu/drm/zte/zx_crtc.c | 691 +++++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/zte/zx_crtc.h | 47 +++
> drivers/gpu/drm/zte/zx_drm_drv.c | 258 +++++++++++++++
> drivers/gpu/drm/zte/zx_drm_drv.h | 22 ++
> drivers/gpu/drm/zte/zx_hdmi.c | 540 ++++++++++++++++++++++++++++++
> drivers/gpu/drm/zte/zx_plane.c | 362 ++++++++++++++++++++
> drivers/gpu/drm/zte/zx_plane.h | 26 ++
> 11 files changed, 1965 insertions(+)
> create mode 100644 drivers/gpu/drm/zte/Kconfig
> create mode 100644 drivers/gpu/drm/zte/Makefile
> create mode 100644 drivers/gpu/drm/zte/zx_crtc.c
> create mode 100644 drivers/gpu/drm/zte/zx_crtc.h
> create mode 100644 drivers/gpu/drm/zte/zx_drm_drv.c
> create mode 100644 drivers/gpu/drm/zte/zx_drm_drv.h
> create mode 100644 drivers/gpu/drm/zte/zx_hdmi.c
> create mode 100644 drivers/gpu/drm/zte/zx_plane.c
> create mode 100644 drivers/gpu/drm/zte/zx_plane.h

New entry in MAINTAINERS listening you (and probably dri-devel as the m-l)
is missing.

>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index 483059a22b1b..a91f8cecbe0f 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -223,6 +223,8 @@ source "drivers/gpu/drm/hisilicon/Kconfig"
>
> source "drivers/gpu/drm/mediatek/Kconfig"
>
> +source "drivers/gpu/drm/zte/Kconfig"
> +
> # Keep legacy drivers last
>
> menuconfig DRM_LEGACY
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 439d89b25ae0..fe461c94d266 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -85,3 +85,4 @@ obj-$(CONFIG_DRM_FSL_DCU) += fsl-dcu/
> obj-$(CONFIG_DRM_ETNAVIV) += etnaviv/
> obj-$(CONFIG_DRM_ARCPGU)+= arc/
> obj-y += hisilicon/
> +obj-$(CONFIG_DRM_ZTE) += zte/
> diff --git a/drivers/gpu/drm/zte/Kconfig b/drivers/gpu/drm/zte/Kconfig
> new file mode 100644
> index 000000000000..4065b2840f1c
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/Kconfig
> @@ -0,0 +1,8 @@
> +config DRM_ZTE
> + tristate "DRM Support for ZTE SoCs"
> + depends on DRM && ARCH_ZX
> + select DRM_KMS_CMA_HELPER
> + select DRM_KMS_FB_HELPER
> + select DRM_KMS_HELPER
> + help
> + Choose this option to enable DRM on ZTE ZX SoCs.
> diff --git a/drivers/gpu/drm/zte/Makefile b/drivers/gpu/drm/zte/Makefile
> new file mode 100644
> index 000000000000..b40968dc749f
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/Makefile
> @@ -0,0 +1,8 @@
> +zxdrm-y := \
> + zx_drm_drv.o \
> + zx_crtc.o \
> + zx_plane.o \
> + zx_hdmi.o
> +
> +obj-$(CONFIG_DRM_ZTE) += zxdrm.o
> +
> diff --git a/drivers/gpu/drm/zte/zx_crtc.c b/drivers/gpu/drm/zte/zx_crtc.c
> new file mode 100644
> index 000000000000..818bf9072573
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_crtc.c
> @@ -0,0 +1,691 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#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/component.h>
> +#include <linux/of_address.h>
> +#include <video/videomode.h>
> +
> +#include "zx_drm_drv.h"
> +#include "zx_crtc.h"
> +#include "zx_plane.h"
> +
> +/* OSD (GPC_GLOBAL) registers */
> +#define OSD_INT_STA 0x04
> +#define OSD_INT_CLRSTA 0x08
> +#define OSD_INT_MSK 0x0c
> +#define OSD_INT_AUX_UPT BIT(14)
> +#define OSD_INT_MAIN_UPT BIT(13)
> +#define OSD_INT_GL1_LBW BIT(10)
> +#define OSD_INT_GL0_LBW BIT(9)
> +#define OSD_INT_VL2_LBW BIT(8)
> +#define OSD_INT_VL1_LBW BIT(7)
> +#define OSD_INT_VL0_LBW BIT(6)
> +#define OSD_INT_BUS_ERR BIT(3)
> +#define OSD_INT_CFG_ERR BIT(2)
> +#define OSD_INT_ERROR (\
> + OSD_INT_GL1_LBW | OSD_INT_GL0_LBW | \
> + OSD_INT_VL2_LBW | OSD_INT_VL1_LBW | OSD_INT_VL0_LBW | \
> + OSD_INT_BUS_ERR | OSD_INT_CFG_ERR \
> +)
> +#define OSD_INT_ENABLE (OSD_INT_ERROR | OSD_INT_AUX_UPT | OSD_INT_MAIN_UPT)
> +#define OSD_CTRL0 0x10
> +#define OSD_CTRL0_GL0_EN BIT(7)
> +#define OSD_CTRL0_GL0_SEL BIT(6)
> +#define OSD_CTRL0_GL1_EN BIT(5)
> +#define OSD_CTRL0_GL1_SEL BIT(4)
> +#define OSD_RST_CLR 0x1c
> +#define RST_PER_FRAME BIT(19)
> +
> +/* Main/Aux channel registers */
> +#define OSD_MAIN_CHN 0x470
> +#define OSD_AUX_CHN 0x4d0
> +#define CHN_CTRL0 0x00
> +#define CHN_ENABLE BIT(0)
> +#define CHN_CTRL1 0x04
> +#define CHN_SCREEN_W_SHIFT 18
> +#define CHN_SCREEN_W_MASK (0x1fff << CHN_SCREEN_W_SHIFT)
> +#define CHN_SCREEN_H_SHIFT 5
> +#define CHN_SCREEN_H_MASK (0x1fff << CHN_SCREEN_H_SHIFT)
> +#define CHN_UPDATE 0x08
> +
> +/* TIMING_CTRL registers */
> +#define TIMING_TC_ENABLE 0x04
> +#define AUX_TC_EN BIT(1)
> +#define MAIN_TC_EN BIT(0)
> +#define FIR_MAIN_ACTIVE 0x08
> +#define FIR_AUX_ACTIVE 0x0c
> +#define FIR_MAIN_H_TIMING 0x10
> +#define FIR_MAIN_V_TIMING 0x14
> +#define FIR_AUX_H_TIMING 0x18
> +#define FIR_AUX_V_TIMING 0x1c
> +#define SYNC_WIDE_SHIFT 22
> +#define SYNC_WIDE_MASK (0x3ff << SYNC_WIDE_SHIFT)
> +#define BACK_PORCH_SHIFT 11
> +#define BACK_PORCH_MASK (0x7ff << BACK_PORCH_SHIFT)
> +#define FRONT_PORCH_SHIFT 0
> +#define FRONT_PORCH_MASK (0x7ff << FRONT_PORCH_SHIFT)
> +#define TIMING_CTRL 0x20
> +#define AUX_POL_SHIFT 3
> +#define AUX_POL_MASK (0x7 << AUX_POL_SHIFT)
> +#define MAIN_POL_SHIFT 0
> +#define MAIN_POL_MASK (0x7 << MAIN_POL_SHIFT)
> +#define POL_DE_SHIFT 2
> +#define POL_VSYNC_SHIFT 1
> +#define POL_HSYNC_SHIFT 0
> +#define TIMING_INT_CTRL 0x24
> +#define TIMING_INT_STATE 0x28
> +#define TIMING_INT_AUX_FRAME BIT(3)
> +#define TIMING_INT_MAIN_FRAME BIT(1)
> +#define TIMING_INT_AUX_FRAME_SEL_VSW (0x2 << 10)
> +#define TIMING_INT_MAIN_FRAME_SEL_VSW (0x2 << 6)
> +#define TIMING_INT_ENABLE (\
> + TIMING_INT_MAIN_FRAME_SEL_VSW | TIMING_INT_AUX_FRAME_SEL_VSW | \
> + TIMING_INT_MAIN_FRAME | TIMING_INT_AUX_FRAME \
> +)
> +#define TIMING_MAIN_SHIFT 0x2c
> +#define TIMING_AUX_SHIFT 0x30
> +#define H_SHIFT_VAL 0x0048
> +#define TIMING_MAIN_PI_SHIFT 0x68
> +#define TIMING_AUX_PI_SHIFT 0x6c
> +#define H_PI_SHIFT_VAL 0x000f
> +
> +/* DTRC registers */
> +#define DTRC_F0_CTRL 0x2c
> +#define DTRC_F1_CTRL 0x5c
> +#define DTRC_DECOMPRESS_BYPASS BIT(17)
> +#define DTRC_DETILE_CTRL 0x68
> +#define TILE2RASTESCAN_BYPASS_MODE BIT(30)
> +#define DETILE_ARIDR_MODE_MASK (0x3 << 0)
> +#define DETILE_ARID_ALL 0
> +#define DETILE_ARID_IN_ARIDR 1
> +#define DETILE_ARID_BYP_BUT_ARIDR 2
> +#define DETILE_ARID_IN_ARIDR2 3
> +#define DTRC_ARID 0x6c
> +#define DTRC_DEC2DDR_ARID 0x70
> +
> +/* VOU_CTRL registers */
> +#define VOU_INF_EN 0x00
> +#define VOU_INF_CH_SEL 0x04
> +#define VOU_INF_DATA_SEL 0x08
> +#define VOU_SOFT_RST 0x14
> +#define VOU_CLK_SEL 0x18
> +#define VOU_CLK_GL1_SEL BIT(5)
> +#define VOU_CLK_GL0_SEL BIT(4)
> +#define VOU_CLK_REQEN 0x20
> +#define VOU_CLK_EN 0x24
> +
> +/* OTFPPU_CTRL registers */
> +#define OTFPPU_RSZ_DATA_SOURCE 0x04
> +
> +#define GL_NUM 2
> +#define VL_NUM 3
> +
> +enum vou_chn_type {
> + VOU_CHN_MAIN,
> + VOU_CHN_AUX,
> +};
> +
> +struct zx_crtc {
> + struct drm_crtc crtc;
> + struct drm_plane *primary;
> + struct device *dev;
> + void __iomem *chnreg;
> + enum vou_chn_type chn_type;
> + struct clk *pixclk;
> +};
> +
> +#define to_zx_crtc(x) container_of(crtc, struct zx_crtc, crtc)
> +
> +struct zx_vou_hw {
> + struct device *dev;
> + void __iomem *osd;
> + void __iomem *timing;
> + void __iomem *vouctl;
> + void __iomem *otfppu;
> + void __iomem *dtrc;
> + struct clk *axi_clk;
> + struct clk *ppu_clk;
> + struct clk *main_clk;
> + struct clk *aux_clk;
> + struct zx_crtc *main_crtc;
> + struct zx_crtc *aux_crtc;
> +};
> +
> +static inline bool is_main_crtc(struct drm_crtc *crtc)
> +{
> + struct zx_crtc *zcrtc = to_zx_crtc(crtc);
> +
> + return zcrtc->chn_type == VOU_CHN_MAIN;
> +}
> +
> +void vou_inf_enable(struct vou_inf *inf)
> +{
> + struct drm_encoder *encoder = inf->encoder;
> + struct drm_device *drm = encoder->dev;
> + struct zx_drm_private *priv = drm->dev_private;
> + struct zx_vou_hw *vou = priv->vou;
> + bool is_main = is_main_crtc(encoder->crtc);
> + u32 data_sel_shift = inf->id << 1;
> + u32 val;
> +
> + /* Select data format */
> + val = readl(vou->vouctl + VOU_INF_DATA_SEL);
> + val &= ~(0x3 << data_sel_shift);
> + val |= inf->data_sel << data_sel_shift;
> + writel(val, vou->vouctl + VOU_INF_DATA_SEL);
> +
> + /* Select channel */
> + val = readl(vou->vouctl + VOU_INF_CH_SEL);
> + if (is_main)
> + val &= ~(1 << inf->id);
> + else
> + val |= 1 << inf->id;
> + writel(val, vou->vouctl + VOU_INF_CH_SEL);
> +
> + /* Select interface clocks */
> + val = readl(vou->vouctl + VOU_CLK_SEL);
> + if (is_main)
> + val &= ~inf->clocks_sel_bits;
> + else
> + val |= inf->clocks_sel_bits;
> + writel(val, vou->vouctl + VOU_CLK_SEL);
> +
> + /* Enable interface clocks */
> + val = readl(vou->vouctl + VOU_CLK_EN);
> + val |= inf->clocks_en_bits;
> + writel(val, vou->vouctl + VOU_CLK_EN);
> +
> + /* Enable the device */
> + val = readl(vou->vouctl + VOU_INF_EN);
> + val |= 1 << inf->id;
> + writel(val, vou->vouctl + VOU_INF_EN);
> +}
> +
> +void vou_inf_disable(struct vou_inf *inf)
> +{
> + struct drm_encoder *encoder = inf->encoder;
> + struct drm_device *drm = encoder->dev;
> + struct zx_drm_private *priv = drm->dev_private;
> + struct zx_vou_hw *vou = priv->vou;
> + u32 val;
> +
> + /* Disable the device */
> + val = readl(vou->vouctl + VOU_INF_EN);
> + val &= ~(1 << inf->id);
> + writel(val, vou->vouctl + VOU_INF_EN);
> +
> + /* Disable interface clocks */
> + val = readl(vou->vouctl + VOU_CLK_EN);
> + val &= ~inf->clocks_en_bits;
> + writel(val, vou->vouctl + VOU_CLK_EN);
> +}
> +
> +static inline void vou_chn_set_update(struct zx_crtc *zcrtc)
> +{
> + writel(1, zcrtc->chnreg + CHN_UPDATE);
> +}
> +
> +static void zx_crtc_enable(struct drm_crtc *crtc)
> +{
> + struct drm_display_mode *mode = &crtc->state->adjusted_mode;
> + struct zx_crtc *zcrtc = to_zx_crtc(crtc);
> + struct zx_vou_hw *vou = dev_get_drvdata(zcrtc->dev);
> + bool is_main = is_main_crtc(crtc);
> + struct videomode vm;
> + u32 pol = 0;
> + u32 val;
> +
> + drm_display_mode_to_videomode(mode, &vm);
> +
> + /* Set up timing parameters */
> + val = (vm.vactive - 1) << 16;
> + val |= (vm.hactive - 1) & 0xffff;
> + writel(val, vou->timing + (is_main ? FIR_MAIN_ACTIVE : FIR_AUX_ACTIVE));
> +
> + val = ((vm.hsync_len - 1) << SYNC_WIDE_SHIFT) & SYNC_WIDE_MASK;
> + val |= ((vm.hback_porch - 1) << BACK_PORCH_SHIFT) & BACK_PORCH_MASK;
> + val |= ((vm.hfront_porch - 1) << FRONT_PORCH_SHIFT) & FRONT_PORCH_MASK;
> + writel(val, vou->timing + (is_main ? FIR_MAIN_H_TIMING :
> + FIR_AUX_H_TIMING));
> +
> + val = ((vm.vsync_len - 1) << SYNC_WIDE_SHIFT) & SYNC_WIDE_MASK;
> + val |= ((vm.vback_porch - 1) << BACK_PORCH_SHIFT) & BACK_PORCH_MASK;
> + val |= ((vm.vfront_porch - 1) << FRONT_PORCH_SHIFT) & FRONT_PORCH_MASK;
> + writel(val, vou->timing + (is_main ? FIR_MAIN_V_TIMING :
> + FIR_AUX_V_TIMING));
> +
> + /* Set up polarities */
> + if (vm.flags & DISPLAY_FLAGS_VSYNC_LOW)
> + pol |= 1 << POL_VSYNC_SHIFT;
> + if (vm.flags & DISPLAY_FLAGS_HSYNC_LOW)
> + pol |= 1 << POL_HSYNC_SHIFT;
> +
> + val = readl(vou->timing + TIMING_CTRL);
> + val &= ~(is_main ? MAIN_POL_MASK : AUX_POL_MASK);
> + val |= pol << (is_main ? MAIN_POL_SHIFT : AUX_POL_SHIFT);
> + writel(val, vou->timing + TIMING_CTRL);
> +
> + /* Setup SHIFT register by following what ZTE BSP does */
> + writel(H_SHIFT_VAL, vou->timing + (is_main ? TIMING_MAIN_SHIFT :
> + TIMING_AUX_SHIFT));
> + writel(H_PI_SHIFT_VAL, vou->timing + (is_main ? TIMING_MAIN_PI_SHIFT :
> + TIMING_AUX_PI_SHIFT));
> +
> + /* Enable TIMING_CTRL */
> + val = readl(vou->timing + TIMING_TC_ENABLE);
> + val |= is_main ? MAIN_TC_EN : AUX_TC_EN;
> + writel(val, vou->timing + TIMING_TC_ENABLE);
> +
> + /* Configure channel screen size */
> + val = readl(zcrtc->chnreg + CHN_CTRL1);
> + val &= ~(CHN_SCREEN_W_MASK | CHN_SCREEN_H_MASK);
> + val |= (vm.hactive << CHN_SCREEN_W_SHIFT) & CHN_SCREEN_W_MASK;
> + val |= (vm.vactive << CHN_SCREEN_H_SHIFT) & CHN_SCREEN_H_MASK;
> + writel(val, zcrtc->chnreg + CHN_CTRL1);
> +
> + /* Update channel */
> + vou_chn_set_update(zcrtc);
> +
> + /* Enable channel */
> + val = readl(zcrtc->chnreg + CHN_CTRL0);
> + val |= CHN_ENABLE;
> + writel(val, zcrtc->chnreg + CHN_CTRL0);
> +
> + /* Enable Graphic Layer */
> + val = readl(vou->osd + OSD_CTRL0);
> + val |= is_main ? OSD_CTRL0_GL0_EN : OSD_CTRL0_GL1_EN;
> + writel(val, vou->osd + OSD_CTRL0);
> +
> + drm_crtc_vblank_on(crtc);
> +
> + /* Enable pixel clock */
> + clk_set_rate(zcrtc->pixclk, mode->clock * 1000);
> + clk_prepare_enable(zcrtc->pixclk);
> +}
> +
> +static void zx_crtc_disable(struct drm_crtc *crtc)
> +{
> + struct zx_crtc *zcrtc = to_zx_crtc(crtc);
> + struct zx_vou_hw *vou = dev_get_drvdata(zcrtc->dev);
> + bool is_main = is_main_crtc(crtc);
> + u32 val;
> +
> + clk_disable_unprepare(zcrtc->pixclk);
> +
> + drm_crtc_vblank_off(crtc);
> +
> + /* Disable Graphic Layer */
> + val = readl(vou->osd + OSD_CTRL0);
> + val &= ~(is_main ? OSD_CTRL0_GL0_EN : OSD_CTRL0_GL1_EN);
> + writel(val, vou->osd + OSD_CTRL0);
> +
> + /* Disable channel */
> + val = readl(zcrtc->chnreg + CHN_CTRL0);
> + val &= ~CHN_ENABLE;
> + writel(val, zcrtc->chnreg + CHN_CTRL0);
> +
> + /* Disable TIMING_CTRL */
> + val = readl(vou->timing + TIMING_TC_ENABLE);
> + val &= ~(is_main ? MAIN_TC_EN : AUX_TC_EN);
> + writel(val, vou->timing + TIMING_TC_ENABLE);
> +}
> +
> +static void zx_crtc_atomic_begin(struct drm_crtc *crtc,
> + struct drm_crtc_state *state)
> +{
> + struct drm_pending_vblank_event *event = crtc->state->event;
> +
> + if (event) {
> + crtc->state->event = NULL;
> +
> + spin_lock_irq(&crtc->dev->event_lock);
> + if (drm_crtc_vblank_get(crtc) == 0)
> + drm_crtc_arm_vblank_event(crtc, event);
> + else
> + drm_crtc_send_vblank_event(crtc, event);
> + spin_unlock_irq(&crtc->dev->event_lock);
> + }
> +}
> +
> +static const struct drm_crtc_helper_funcs zx_crtc_helper_funcs = {
> + .enable = zx_crtc_enable,
> + .disable = zx_crtc_disable,
> + .atomic_begin = zx_crtc_atomic_begin,
> +};
> +
> +static const struct drm_crtc_funcs zx_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 zx_crtc *zx_crtc_init(struct drm_device *drm,
> + enum vou_chn_type chn_type)
> +{
> + struct zx_drm_private *priv = drm->dev_private;
> + struct zx_vou_hw *vou = priv->vou;
> + struct device *dev = vou->dev;
> + struct zx_layer_data data;
> + struct zx_crtc *zcrtc;
> + int ret;
> +
> + zcrtc = devm_kzalloc(dev, sizeof(*zcrtc), GFP_KERNEL);
> + if (!zcrtc)
> + return ERR_PTR(-ENOMEM);
> +
> + zcrtc->dev = dev;
> + zcrtc->chn_type = chn_type;
> +
> + if (chn_type == VOU_CHN_MAIN) {
> + data.layer = vou->osd + 0x130;
> + data.csc = vou->osd + 0x580;
> + data.hbsc = vou->osd + 0x820;
> + data.rsz = vou->otfppu + 0x600;
> + zcrtc->chnreg = vou->osd + OSD_MAIN_CHN;
> + } else {
> + data.layer = vou->osd + 0x200;
> + data.csc = vou->osd + 0x5d0;
> + data.hbsc = vou->osd + 0x860;
> + data.rsz = vou->otfppu + 0x800;
> + zcrtc->chnreg = vou->osd + OSD_AUX_CHN;
> + }
> +
> + zcrtc->pixclk = devm_clk_get(dev, (chn_type == VOU_CHN_MAIN) ?
> + "main_wclk" : "aux_wclk");
> + if (IS_ERR(zcrtc->pixclk))
> + return ERR_PTR(PTR_ERR(zcrtc->pixclk));
> +
> + zcrtc->primary = zx_plane_init(drm, dev, &data, DRM_PLANE_TYPE_PRIMARY);
> + if (IS_ERR(zcrtc->primary))
> + return ERR_PTR(PTR_ERR(zcrtc->primary));
> +
> + ret = drm_crtc_init_with_planes(drm, &zcrtc->crtc, zcrtc->primary, NULL,
> + &zx_crtc_funcs, NULL);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + drm_crtc_helper_add(&zcrtc->crtc, &zx_crtc_helper_funcs);
> +
> + return zcrtc;
> +}
> +
> +int zx_crtc_enable_vblank(struct drm_device *drm, unsigned int pipe)
> +{
> + struct zx_drm_private *priv = drm->dev_private;
> + struct zx_vou_hw *vou = priv->vou;
> + u32 intctl;
> +
> + intctl = readl(vou->timing + TIMING_INT_CTRL);
> + if (pipe == 0)
> + intctl |= TIMING_INT_MAIN_FRAME;
> + else
> + intctl |= TIMING_INT_AUX_FRAME;
> + writel(intctl, vou->timing + TIMING_INT_CTRL);
> +
> + return 0;
> +}
> +
> +void zx_crtc_disable_vblank(struct drm_device *drm, unsigned int pipe)
> +{
> + struct zx_drm_private *priv = drm->dev_private;
> + struct zx_vou_hw *vou = priv->vou;
> + u32 intctl;
> +
> + intctl = readl(vou->timing + TIMING_INT_CTRL);
> + if (pipe == 0)
> + intctl &= ~TIMING_INT_MAIN_FRAME;
> + else
> + intctl &= ~TIMING_INT_AUX_FRAME;
> + writel(intctl, vou->timing + TIMING_INT_CTRL);
> +}
> +
> +static irqreturn_t vou_irq_handler(int irq, void *dev_id)
> +{
> + struct zx_vou_hw *vou = dev_id;
> + u32 state;
> +
> + /* Handle TIMING_CTRL frame interrupts */
> + state = readl(vou->timing + TIMING_INT_STATE);
> + writel(state, vou->timing + TIMING_INT_STATE);
> +
> + if (state & TIMING_INT_MAIN_FRAME)
> + drm_crtc_handle_vblank(&vou->main_crtc->crtc);
> +
> + if (state & TIMING_INT_AUX_FRAME)
> + drm_crtc_handle_vblank(&vou->aux_crtc->crtc);
> +
> + /* Handle OSD interrupts */
> + state = readl(vou->osd + OSD_INT_STA);
> + writel(state, vou->osd + OSD_INT_CLRSTA);
> +
> + if (state & OSD_INT_MAIN_UPT) {
> + vou_chn_set_update(vou->main_crtc);
> + zx_plane_set_update(vou->main_crtc->primary);
> + }
> +
> + if (state & OSD_INT_AUX_UPT) {
> + vou_chn_set_update(vou->aux_crtc);
> + zx_plane_set_update(vou->aux_crtc->primary);
> + }
> +
> + if (state & OSD_INT_ERROR)
> + dev_err(vou->dev, "OSD ERROR: 0x%08x!\n", state);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static void vou_dtrc_init(struct zx_vou_hw *vou)
> +{
> + u32 val;
> +
> + val = readl(vou->dtrc + DTRC_DETILE_CTRL);
> + /* Clear bit for bypass by ID */
> + val &= ~TILE2RASTESCAN_BYPASS_MODE;
> + /* Select ARIDR mode */
> + val &= ~DETILE_ARIDR_MODE_MASK;
> + val |= DETILE_ARID_IN_ARIDR;
> + writel(val, vou->dtrc + DTRC_DETILE_CTRL);
> +
> + /* Bypass decompression for both frames */
> + val = readl(vou->dtrc + DTRC_F0_CTRL);
> + val |= DTRC_DECOMPRESS_BYPASS;
> + writel(val, vou->dtrc + DTRC_F0_CTRL);
> +
> + val = readl(vou->dtrc + DTRC_F1_CTRL);
> + val |= DTRC_DECOMPRESS_BYPASS;
> + writel(val, vou->dtrc + DTRC_F1_CTRL);
> +
> + /* Set up ARID register */
> + val = 0x0e;
> + val |= 0x0f << 8;
> + val |= 0x0e << 16;
> + val |= 0x0f << 24;
> + writel(val, vou->dtrc + DTRC_ARID);
> +
> + /* Set up DEC2DDR_ARID register */
> + val = 0x0e;
> + val |= 0x0f << 8;
> + writel(val, vou->dtrc + DTRC_DEC2DDR_ARID);
> +}
> +
> +static void vou_hw_init(struct zx_vou_hw *vou)
> +{
> + u32 val;
> +
> + /* Set GL0 to main channel and GL1 to aux channel */
> + val = readl(vou->osd + OSD_CTRL0);
> + val &= ~OSD_CTRL0_GL0_SEL;
> + val |= OSD_CTRL0_GL1_SEL;
> + writel(val, vou->osd + OSD_CTRL0);
> +
> + /* Release reset for all VOU modules */
> + writel(~0, vou->vouctl + VOU_SOFT_RST);
> +
> + /* Select main clock for GL0 and aux clock for GL1 module */
> + val = readl(vou->vouctl + VOU_CLK_SEL);
> + val &= ~VOU_CLK_GL0_SEL;
> + val |= VOU_CLK_GL1_SEL;
> + writel(val, vou->vouctl + VOU_CLK_SEL);
> +
> + /* Enable clock auto-gating for all VOU modules */
> + writel(~0, vou->vouctl + VOU_CLK_REQEN);
> +
> + /* Enable all VOU module clocks */
> + writel(~0, vou->vouctl + VOU_CLK_EN);
> +
> + /* Clear both OSD and TIMING_CTRL interrupt state */
> + writel(~0, vou->osd + OSD_INT_CLRSTA);
> + writel(~0, vou->timing + TIMING_INT_STATE);
> +
> + /* Enable OSD and TIMING_CTRL interrrupts */
> + writel(OSD_INT_ENABLE, vou->osd + OSD_INT_MSK);
> + writel(TIMING_INT_ENABLE, vou->timing + TIMING_INT_CTRL);
> +
> + /* Select GPC as input to gl/vl scaler as a sane default setting */
> + writel(0x2a, vou->otfppu + OTFPPU_RSZ_DATA_SOURCE);
> +
> + /*
> + * Needs to reset channel and layer logic per frame when frame starts
> + * to get VOU work properly.
> + */
> + val = readl(vou->osd + OSD_RST_CLR);
> + val |= RST_PER_FRAME;
> + writel(val, vou->osd + OSD_RST_CLR);
> +
> + vou_dtrc_init(vou);
> +}
> +
> +static int zx_crtc_bind(struct device *dev, struct device *master, void *data)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct drm_device *drm = data;
> + struct zx_drm_private *priv = drm->dev_private;
> + struct resource *res;
> + struct zx_vou_hw *vou;
> + int irq;
> + int ret;
> +
> + vou = devm_kzalloc(dev, sizeof(*vou), GFP_KERNEL);
> + if (!vou)
> + return -ENOMEM;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "osd");
> + vou->osd = devm_ioremap_resource(dev, res);
> + if (IS_ERR(vou->osd))
> + return PTR_ERR(vou->osd);
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "timing_ctrl");
> + vou->timing = devm_ioremap_resource(dev, res);
> + if (IS_ERR(vou->timing))
> + return PTR_ERR(vou->timing);
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dtrc");
> + vou->dtrc = devm_ioremap_resource(dev, res);
> + if (IS_ERR(vou->dtrc))
> + return PTR_ERR(vou->dtrc);
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vou_ctrl");
> + vou->vouctl = devm_ioremap_resource(dev, res);
> + if (IS_ERR(vou->vouctl))
> + return PTR_ERR(vou->vouctl);
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otfppu");
> + vou->otfppu = devm_ioremap_resource(dev, res);
> + if (IS_ERR(vou->otfppu))
> + return PTR_ERR(vou->otfppu);
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + vou->axi_clk = devm_clk_get(dev, "aclk");
> + if (IS_ERR(vou->axi_clk))
> + return PTR_ERR(vou->axi_clk);
> +
> + vou->ppu_clk = devm_clk_get(dev, "ppu_wclk");
> + if (IS_ERR(vou->ppu_clk))
> + return PTR_ERR(vou->ppu_clk);
> +
> + clk_prepare_enable(vou->axi_clk);
> + clk_prepare_enable(vou->ppu_clk);
> +
> + vou->dev = dev;
> + priv->vou = vou;
> + dev_set_drvdata(dev, vou);
> +
> + vou_hw_init(vou);
> +
> + ret = devm_request_irq(dev, irq, vou_irq_handler, 0, "zx_vou", vou);
> + if (ret < 0)
> + return ret;
> +
> + vou->main_crtc = zx_crtc_init(drm, VOU_CHN_MAIN);
> + if (IS_ERR(vou->main_crtc))
> + return PTR_ERR(vou->main_crtc);
> +
> + vou->aux_crtc = zx_crtc_init(drm, VOU_CHN_AUX);
> + if (IS_ERR(vou->aux_crtc))
> + return PTR_ERR(vou->aux_crtc);
> +
> + return 0;
> +}
> +
> +static void zx_crtc_unbind(struct device *dev, struct device *master,
> + void *data)
> +{
> + struct zx_vou_hw *vou = dev_get_drvdata(dev);
> +
> + clk_disable_unprepare(vou->axi_clk);
> + clk_disable_unprepare(vou->ppu_clk);
> +}
> +
> +static const struct component_ops zx_crtc_component_ops = {
> + .bind = zx_crtc_bind,
> + .unbind = zx_crtc_unbind,
> +};
> +
> +static int zx_crtc_probe(struct platform_device *pdev)
> +{
> + return component_add(&pdev->dev, &zx_crtc_component_ops);
> +}
> +
> +static int zx_crtc_remove(struct platform_device *pdev)
> +{
> + component_del(&pdev->dev, &zx_crtc_component_ops);
> + return 0;
> +}
> +
> +static const struct of_device_id zx_crtc_of_match[] = {
> + { .compatible = "zte,zx296718-dpc", },
> + { /* end */ },
> +};
> +MODULE_DEVICE_TABLE(of, zx_crtc_of_match);
> +
> +struct platform_driver zx_crtc_driver = {
> + .probe = zx_crtc_probe,
> + .remove = zx_crtc_remove,
> + .driver = {
> + .name = "zx-crtc",
> + .of_match_table = zx_crtc_of_match,
> + },
> +};
> diff --git a/drivers/gpu/drm/zte/zx_crtc.h b/drivers/gpu/drm/zte/zx_crtc.h
> new file mode 100644
> index 000000000000..f889208054ce
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_crtc.h
> @@ -0,0 +1,47 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#ifndef __ZX_CRTC_H__
> +#define __ZX_CRTC_H__
> +
> +#define VOU_CRTC_MASK 0x3
> +
> +/* VOU output interfaces */
> +enum vou_inf_id {
> + VOU_HDMI = 0,
> + VOU_RGB_LCD = 1,
> + VOU_TV_ENC = 2,
> + VOU_MIPI_DSI = 3,
> + VOU_LVDS = 4,
> + VOU_VGA = 5,
> +};
> +
> +enum vou_inf_data_sel {
> + VOU_YUV444 = 0,
> + VOU_RGB_101010 = 1,
> + VOU_RGB_888 = 2,
> + VOU_RGB_666 = 3,
> +};
> +
> +struct vou_inf {
> + struct drm_encoder *encoder;
> + enum vou_inf_id id;
> + enum vou_inf_data_sel data_sel;
> + u32 clocks_en_bits;
> + u32 clocks_sel_bits;
> +};
> +
> +void vou_inf_enable(struct vou_inf *inf);
> +void vou_inf_disable(struct vou_inf *inf);
> +
> +int zx_crtc_enable_vblank(struct drm_device *drm, unsigned int pipe);
> +void zx_crtc_disable_vblank(struct drm_device *drm, unsigned int pipe);
> +
> +#endif /* __ZX_CRTC_H__ */
> diff --git a/drivers/gpu/drm/zte/zx_drm_drv.c b/drivers/gpu/drm/zte/zx_drm_drv.c
> new file mode 100644
> index 000000000000..51fafb8e5f43
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_drm_drv.c
> @@ -0,0 +1,258 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#include <linux/module.h>
> +#include <linux/spinlock.h>
> +#include <linux/clk.h>
> +#include <linux/component.h>
> +#include <linux/list.h>
> +#include <linux/of_graph.h>
> +#include <linux/of_platform.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 "zx_drm_drv.h"
> +#include "zx_crtc.h"
> +
> +static void zx_drm_fb_output_poll_changed(struct drm_device *drm)
> +{
> + struct zx_drm_private *priv = drm->dev_private;
> +
> + drm_fbdev_cma_hotplug_event(priv->fbdev);
> +}
> +
> +static const struct drm_mode_config_funcs zx_drm_mode_config_funcs = {
> + .fb_create = drm_fb_cma_create,
> + .output_poll_changed = zx_drm_fb_output_poll_changed,
> + .atomic_check = drm_atomic_helper_check,
> + .atomic_commit = drm_atomic_helper_commit,
> +};
> +
> +static void zx_drm_lastclose(struct drm_device *drm)
> +{
> + struct zx_drm_private *priv = drm->dev_private;
> +
> + drm_fbdev_cma_restore_mode(priv->fbdev);
> +}
> +
> +static const struct file_operations zx_drm_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 zx_drm_driver = {
> + .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
> + DRIVER_ATOMIC,
> + .lastclose = zx_drm_lastclose,
> + .get_vblank_counter = drm_vblank_no_hw_counter,
> + .enable_vblank = zx_crtc_enable_vblank,
> + .disable_vblank = zx_crtc_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,
> + .fops = &zx_drm_fops,
> + .name = "zx-vou",
> + .desc = "ZTE VOU Controller DRM",
> + .date = "20160811",
> + .major = 1,
> + .minor = 0,
> +};
> +
> +static int zx_drm_bind(struct device *dev)
> +{
> + struct drm_device *drm;
> + struct zx_drm_private *priv;
> + int ret;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + drm = drm_dev_alloc(&zx_drm_driver, dev);
> + if (!drm)
> + return -ENOMEM;
> +
> + drm->dev_private = priv;
> + dev_set_drvdata(dev, drm);
> +
> + drm_mode_config_init(drm);
> + drm->mode_config.min_width = 16;
> + drm->mode_config.min_height = 16;
> + drm->mode_config.max_width = 4096;
> + drm->mode_config.max_height = 4096;
> + drm->mode_config.funcs = &zx_drm_mode_config_funcs;
> +
> + ret = drm_dev_register(drm, 0);

drm_dev_register should be the last function call in your bind function.
Similar for unbind, drm_dev_register should be called first.

As a consequence of that you can remove the drm_connector_(un)register
calls, those are only needed for hotplugged connectors like dp mst. But
with correct ordering of drm_dev_(un)register that function will also take
care of connector registration and unregistration.

> + if (ret)
> + goto out_free;
> +
> + ret = component_bind_all(dev, drm);
> + if (ret) {
> + DRM_ERROR("Failed to bind all components\n");
> + goto out_unregister;
> + }
> +
> + ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
> + if (ret < 0) {
> + DRM_ERROR("failed to initialise vblank\n");
> + goto out_unbind;
> + }
> +
> + /*
> + * We will manage irq handler on our own. In this case, irq_enabled
> + * need to be true for using vblank core support.
> + */
> + drm->irq_enabled = true;
> +
> + drm_mode_config_reset(drm);
> + drm_kms_helper_poll_init(drm);
> +
> + priv->fbdev = drm_fbdev_cma_init(drm, 32, drm->mode_config.num_crtc,
> + drm->mode_config.num_connector);
> + if (IS_ERR(priv->fbdev)) {
> + ret = PTR_ERR(priv->fbdev);
> + priv->fbdev = NULL;
> + goto out_fini;
> + }
> +
> + return 0;
> +
> +out_fini:
> + drm_kms_helper_poll_fini(drm);
> + drm_mode_config_cleanup(drm);
> + drm_vblank_cleanup(drm);
> +out_unbind:
> + component_unbind_all(dev, drm);
> +out_unregister:
> + drm_dev_unregister(drm);
> +out_free:
> + dev_set_drvdata(dev, NULL);
> + drm_dev_unref(drm);
> + return ret;
> +}
> +
> +static void zx_drm_unbind(struct device *dev)
> +{
> + struct drm_device *drm = dev_get_drvdata(dev);
> + struct zx_drm_private *priv = drm->dev_private;
> +
> + if (priv->fbdev) {
> + drm_fbdev_cma_fini(priv->fbdev);
> + priv->fbdev = NULL;
> + }
> + drm_kms_helper_poll_fini(drm);
> + component_unbind_all(dev, drm);
> + drm_vblank_cleanup(drm);
> + 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 zx_drm_master_ops = {
> + .bind = zx_drm_bind,
> + .unbind = zx_drm_unbind,
> +};
> +
> +static int compare_of(struct device *dev, void *data)
> +{
> + return dev->of_node == data;
> +}
> +
> +static int zx_drm_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *parent = dev->of_node;
> + struct device_node *child;
> + struct component_match *match = NULL;
> + int ret;
> +
> + ret = of_platform_populate(parent, NULL, NULL, dev);
> + if (ret)
> + return ret;
> +
> + for_each_available_child_of_node(parent, child) {
> + component_match_add(dev, &match, compare_of, child);
> + of_node_put(child);
> + }
> +
> + return component_master_add_with_match(dev, &zx_drm_master_ops, match);
> +}
> +
> +static int zx_drm_remove(struct platform_device *pdev)
> +{
> + component_master_del(&pdev->dev, &zx_drm_master_ops);
> + return 0;
> +}
> +
> +static const struct of_device_id zx_drm_of_match[] = {
> + { .compatible = "zte,zx296718-vou", },
> + { /* end */ },
> +};
> +MODULE_DEVICE_TABLE(of, zx_drm_of_match);
> +
> +static struct platform_driver zx_drm_platform_driver = {
> + .probe = zx_drm_probe,
> + .remove = zx_drm_remove,
> + .driver = {
> + .name = "zx-drm",
> + .of_match_table = zx_drm_of_match,
> + },
> +};
> +
> +static struct platform_driver *drivers[] = {
> + &zx_crtc_driver,
> + &zx_hdmi_driver,
> + &zx_drm_platform_driver,
> +};
> +
> +static int zx_drm_init(void)
> +{
> + return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
> +}
> +module_init(zx_drm_init);
> +
> +static void zx_drm_exit(void)
> +{
> + platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
> +}
> +module_exit(zx_drm_exit);
> +
> +MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
> +MODULE_DESCRIPTION("ZTE ZX VOU DRM driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/zte/zx_drm_drv.h b/drivers/gpu/drm/zte/zx_drm_drv.h
> new file mode 100644
> index 000000000000..14c749949151
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_drm_drv.h
> @@ -0,0 +1,22 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#ifndef __ZX_DRM_DRV_H__
> +#define __ZX_DRM_DRV_H__
> +
> +struct zx_drm_private {
> + struct drm_fbdev_cma *fbdev;
> + struct zx_vou_hw *vou;
> +};
> +
> +extern struct platform_driver zx_crtc_driver;
> +extern struct platform_driver zx_hdmi_driver;
> +
> +#endif /* __ZX_DRM_DRV_H__ */
> diff --git a/drivers/gpu/drm/zte/zx_hdmi.c b/drivers/gpu/drm/zte/zx_hdmi.c
> new file mode 100644
> index 000000000000..5aaab8493b1b
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_hdmi.c
> @@ -0,0 +1,540 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#include <drm/drm_of.h>
> +#include <drm/drmP.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_edid.h>
> +#include <linux/irq.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/hdmi.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of_device.h>
> +#include <linux/component.h>
> +
> +#include "zx_crtc.h"
> +
> +#define FUNC_SEL 0x000b
> +#define FUNC_HDMI_EN BIT(0)
> +#define CLKPWD 0x000d
> +#define CLKPWD_PDIDCK BIT(2)
> +#define PWD_SRST 0x0010
> +#define P2T_CTRL 0x0066
> +#define P2T_DC_PKT_EN BIT(7)
> +#define L1_INTR_STAT 0x007e
> +#define L1_INTR_STAT_INTR1 BIT(0)
> +#define INTR1_STAT 0x008f
> +#define INTR1_MASK 0x0095
> +#define INTR1_MONITOR_DETECT (BIT(5) | BIT(6))
> +#define ZX_DDC_ADDR 0x00ed
> +#define ZX_DDC_SEGM 0x00ee
> +#define ZX_DDC_OFFSET 0x00ef
> +#define ZX_DDC_DIN_CNT1 0x00f0
> +#define ZX_DDC_DIN_CNT2 0x00f1
> +#define ZX_DDC_CMD 0x00f3
> +#define DDC_CMD_MASK 0xf
> +#define DDC_CMD_CLEAR_FIFO 0x9
> +#define DDC_CMD_SEQUENTIAL_READ 0x2
> +#define ZX_DDC_DATA 0x00f4
> +#define ZX_DDC_DOUT_CNT 0x00f5
> +#define DDC_DOUT_CNT_MASK 0x1f
> +#define TEST_TXCTRL 0x00f7
> +#define TEST_TXCTRL_HDMI_MODE BIT(1)
> +#define HDMICTL4 0x0235
> +#define TPI_HPD_RSEN 0x063b
> +#define TPI_HPD_CONNECTION (BIT(1) | BIT(2))
> +#define TPI_INFO_FSEL 0x06bf
> +#define FSEL_AVI 0
> +#define FSEL_GBD 1
> +#define FSEL_AUDIO 2
> +#define FSEL_SPD 3
> +#define FSEL_MPEG 4
> +#define FSEL_VSIF 5
> +#define TPI_INFO_B0 0x06c0
> +#define TPI_INFO_EN 0x06df
> +#define TPI_INFO_TRANS_EN BIT(7)
> +#define TPI_INFO_TRANS_RPT BIT(6)
> +#define TPI_DDC_MASTER_EN 0x06f8
> +#define HW_DDC_MASTER BIT(7)
> +
> +#define ZX_HDMI_INFOFRAME_SIZE 31
> +
> +struct zx_hdmi {
> + struct drm_connector connector;
> + struct drm_encoder encoder;
> + struct device *dev;
> + struct drm_device *drm;
> + void __iomem *mmio;
> + struct clk *cec_clk;
> + struct clk *osc_clk;
> + struct clk *xclk;
> + bool sink_is_hdmi;
> + bool sink_has_audio;
> + struct vou_inf *inf;
> +};
> +
> +#define to_zx_hdmi(x) container_of(x, struct zx_hdmi, x)
> +
> +static struct vou_inf vou_inf_hdmi = {
> + .id = VOU_HDMI,
> + .data_sel = VOU_YUV444,
> + .clocks_en_bits = BIT(24) | BIT(18) | BIT(6),
> + .clocks_sel_bits = BIT(13) | BIT(2),
> +};
> +
> +static inline u8 hdmi_readb(struct zx_hdmi *hdmi, u16 offset)
> +{
> + return readl_relaxed(hdmi->mmio + offset * 4);
> +}
> +
> +static inline void hdmi_writeb(struct zx_hdmi *hdmi, u16 offset, u8 val)
> +{
> + writel_relaxed(val, hdmi->mmio + offset * 4);
> +}
> +
> +static int zx_hdmi_infoframe_trans(struct zx_hdmi *hdmi,
> + union hdmi_infoframe *frame, u8 fsel)
> +{
> + u8 buffer[ZX_HDMI_INFOFRAME_SIZE];
> + u8 val;
> + ssize_t num;
> + int i;
> +
> + hdmi_writeb(hdmi, TPI_INFO_FSEL, fsel);
> +
> + num = hdmi_infoframe_pack(frame, buffer, ZX_HDMI_INFOFRAME_SIZE);
> + if (num < 0)
> + return num;
> +
> + for (i = 0; i < num; i++)
> + hdmi_writeb(hdmi, TPI_INFO_B0 + i, buffer[i]);
> +
> + val = hdmi_readb(hdmi, TPI_INFO_EN);
> + val |= TPI_INFO_TRANS_EN | TPI_INFO_TRANS_RPT;
> + hdmi_writeb(hdmi, TPI_INFO_EN, val);
> +
> + return num;
> +}
> +
> +static int zx_hdmi_config_video_vsi(struct zx_hdmi *hdmi,
> + struct drm_display_mode *mode)
> +{
> + union hdmi_infoframe frame;
> + int ret;
> +
> + ret = drm_hdmi_vendor_infoframe_from_display_mode(&frame.vendor.hdmi,
> + mode);
> + if (ret)
> + return ret;
> +
> + return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_VSIF);
> +}
> +
> +static int zx_hdmi_config_video_avi(struct zx_hdmi *hdmi,
> + struct drm_display_mode *mode)
> +{
> + union hdmi_infoframe frame;
> + int ret;
> +
> + ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi, mode);
> + if (ret)
> + return ret;
> +
> + /* We always use YUV444 for HDMI output. */
> + frame.avi.colorspace = HDMI_COLORSPACE_YUV444;
> +
> + return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_AVI);
> +}
> +
> +static void zx_hdmi_encoder_mode_set(struct drm_encoder *encoder,
> + struct drm_display_mode *mode,
> + struct drm_display_mode *adj_mode)
> +{
> + struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
> +
> + if (hdmi->sink_is_hdmi) {
> + zx_hdmi_config_video_avi(hdmi, mode);
> + zx_hdmi_config_video_vsi(hdmi, mode);
> + }
> +}
> +
> +static void zx_hdmi_encoder_enable(struct drm_encoder *encoder)
> +{
> + struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
> +
> + vou_inf_enable(hdmi->inf);
> +}
> +
> +static void zx_hdmi_encoder_disable(struct drm_encoder *encoder)
> +{
> + struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
> +
> + vou_inf_disable(hdmi->inf);
> +}
> +
> +static const struct drm_encoder_helper_funcs zx_hdmi_encoder_helper_funcs = {
> + .enable = zx_hdmi_encoder_enable,
> + .disable = zx_hdmi_encoder_disable,
> + .mode_set = zx_hdmi_encoder_mode_set,
> +};
> +
> +static const struct drm_encoder_funcs zx_hdmi_encoder_funcs = {
> + .destroy = drm_encoder_cleanup,
> +};
> +
> +static int zx_hdmi_get_edid_block(void *data, u8 *buf, unsigned int block,
> + size_t len)
> +{
> + struct zx_hdmi *hdmi = data;
> + int retry = 0;
> + int ret = 0;
> + int i = 0;
> + u8 val;
> +
> + /* Enable DDC master access */
> + val = hdmi_readb(hdmi, TPI_DDC_MASTER_EN);
> + val |= HW_DDC_MASTER;
> + hdmi_writeb(hdmi, TPI_DDC_MASTER_EN, val);
> +
> + hdmi_writeb(hdmi, ZX_DDC_ADDR, 0xa0);
> + hdmi_writeb(hdmi, ZX_DDC_OFFSET, block * EDID_LENGTH);
> + /* Bits [9:8] of bytes */
> + hdmi_writeb(hdmi, ZX_DDC_DIN_CNT2, (len >> 8) & 0xff);
> + /* Bits [7:0] of bytes */
> + hdmi_writeb(hdmi, ZX_DDC_DIN_CNT1, len & 0xff);
> +
> + /* Clear FIFO */
> + val = hdmi_readb(hdmi, ZX_DDC_CMD);
> + val &= ~DDC_CMD_MASK;
> + val |= DDC_CMD_CLEAR_FIFO;
> + hdmi_writeb(hdmi, ZX_DDC_CMD, val);
> +
> + /* Kick off the read */
> + val = hdmi_readb(hdmi, ZX_DDC_CMD);
> + val &= ~DDC_CMD_MASK;
> + val |= DDC_CMD_SEQUENTIAL_READ;
> + hdmi_writeb(hdmi, ZX_DDC_CMD, val);

It looks like the ZX_DDC register range implements a hw i2c engine (since
you specifiy port and offsets and everything). Please implement it as an
i2c_adapter driver and use the normal drm_get_edid function.

> +
> + while (len > 0) {
> + int cnt, j;
> +
> + /* FIFO needs some time to get ready */
> + usleep_range(500, 1000);
> +
> + cnt = hdmi_readb(hdmi, ZX_DDC_DOUT_CNT) & DDC_DOUT_CNT_MASK;
> + if (cnt == 0) {
> + if (++retry > 5) {
> + dev_err(hdmi->dev, "DDC read timed out!");
> + ret = -ETIMEDOUT;
> + break;
> + }
> + continue;
> + }
> +
> + for (j = 0; j < cnt; j++)
> + buf[i++] = hdmi_readb(hdmi, ZX_DDC_DATA);
> + len -= cnt;
> + }
> +
> + /* Disable DDC master access */
> + val = hdmi_readb(hdmi, TPI_DDC_MASTER_EN);
> + val &= ~HW_DDC_MASTER;
> + hdmi_writeb(hdmi, TPI_DDC_MASTER_EN, val);
> +
> + return ret;
> +}
> +
> +static int zx_hdmi_connector_get_modes(struct drm_connector *connector)
> +{
> + struct zx_hdmi *hdmi = to_zx_hdmi(connector);
> + struct edid *edid;
> + int ret = 0;
> +
> + edid = drm_do_get_edid(connector, zx_hdmi_get_edid_block, hdmi);
> + if (edid) {
> + hdmi->sink_is_hdmi = drm_detect_hdmi_monitor(edid);
> + hdmi->sink_has_audio = drm_detect_monitor_audio(edid);
> + drm_mode_connector_update_edid_property(connector, edid);
> + ret = drm_add_edid_modes(connector, edid);
> + kfree(edid);
> + }
> +
> + return ret;
> +}
> +
> +static enum drm_mode_status
> +zx_hdmi_connector_mode_valid(struct drm_connector *connector,
> + struct drm_display_mode *mode)
> +{
> + return MODE_OK;
> +}
> +
> +static struct drm_connector_helper_funcs zx_hdmi_connector_helper_funcs = {
> + .get_modes = zx_hdmi_connector_get_modes,
> + .mode_valid = zx_hdmi_connector_mode_valid,
> +};
> +
> +static enum drm_connector_status
> +zx_hdmi_connector_detect(struct drm_connector *connector, bool force)
> +{
> + struct zx_hdmi *hdmi = to_zx_hdmi(connector);
> +
> + return (hdmi_readb(hdmi, TPI_HPD_RSEN) & TPI_HPD_CONNECTION) ?
> + connector_status_connected : connector_status_disconnected;
> +}
> +
> +static void zx_hdmi_connector_destroy(struct drm_connector *connector)
> +{
> + drm_connector_unregister(connector);
> + drm_connector_cleanup(connector);
> +}
> +
> +static const struct drm_connector_funcs zx_hdmi_connector_funcs = {
> + .dpms = drm_atomic_helper_connector_dpms,
> + .fill_modes = drm_helper_probe_single_connector_modes,
> + .detect = zx_hdmi_connector_detect,
> + .destroy = zx_hdmi_connector_destroy,
> + .reset = drm_atomic_helper_connector_reset,
> + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +static int zx_hdmi_register(struct drm_device *drm, struct zx_hdmi *hdmi)
> +{
> + struct drm_encoder *encoder = &hdmi->encoder;
> +
> + encoder->possible_crtcs = VOU_CRTC_MASK;
> +
> + drm_encoder_init(drm, encoder, &zx_hdmi_encoder_funcs,
> + DRM_MODE_ENCODER_TMDS, NULL);
> + drm_encoder_helper_add(encoder, &zx_hdmi_encoder_helper_funcs);
> +
> + hdmi->connector.polled = DRM_CONNECTOR_POLL_HPD;
> +
> + drm_connector_init(drm, &hdmi->connector, &zx_hdmi_connector_funcs,
> + DRM_MODE_CONNECTOR_HDMIA);
> + drm_connector_helper_add(&hdmi->connector,
> + &zx_hdmi_connector_helper_funcs);
> +
> + drm_mode_connector_attach_encoder(&hdmi->connector, encoder);
> + drm_connector_register(&hdmi->connector);

As mentioned, these drm_connector_register/unregister calls aren't needed
with correct ordering in bind/unbind.

> +
> + return 0;
> +}
> +
> +static irqreturn_t zx_hdmi_irq_thread(int irq, void *dev_id)
> +{
> + struct zx_hdmi *hdmi = dev_id;
> +
> + drm_helper_hpd_irq_event(hdmi->connector.dev);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t zx_hdmi_irq_handler(int irq, void *dev_id)
> +{
> + struct zx_hdmi *hdmi = dev_id;
> + u8 lstat;
> +
> + lstat = hdmi_readb(hdmi, L1_INTR_STAT);
> +
> + /* Monitor detect/HPD interrupt */
> + if (lstat & L1_INTR_STAT_INTR1) {
> + u8 stat = hdmi_readb(hdmi, INTR1_STAT);
> +
> + hdmi_writeb(hdmi, INTR1_STAT, stat);
> + if (stat & INTR1_MONITOR_DETECT)
> + return IRQ_WAKE_THREAD;
> + }
> +
> + return IRQ_NONE;
> +}
> +
> +static void zx_hdmi_phy_start(struct zx_hdmi *hdmi)
> +{
> + /* Copy from ZTE BSP code */
> + hdmi_writeb(hdmi, 0x222, 0x0);
> + hdmi_writeb(hdmi, 0x224, 0x4);
> + hdmi_writeb(hdmi, 0x909, 0x0);
> + hdmi_writeb(hdmi, 0x7b0, 0x90);
> + hdmi_writeb(hdmi, 0x7b1, 0x00);
> + hdmi_writeb(hdmi, 0x7b2, 0xa7);
> + hdmi_writeb(hdmi, 0x7b8, 0xaa);
> + hdmi_writeb(hdmi, 0x7b2, 0xa7);
> + hdmi_writeb(hdmi, 0x7b3, 0x0f);
> + hdmi_writeb(hdmi, 0x7b4, 0x0f);
> + hdmi_writeb(hdmi, 0x7b5, 0x55);
> + hdmi_writeb(hdmi, 0x7b7, 0x03);
> + hdmi_writeb(hdmi, 0x7b9, 0x12);
> + hdmi_writeb(hdmi, 0x7ba, 0x32);
> + hdmi_writeb(hdmi, 0x7bc, 0x68);
> + hdmi_writeb(hdmi, 0x7be, 0x40);
> + hdmi_writeb(hdmi, 0x7bf, 0x84);
> + hdmi_writeb(hdmi, 0x7c1, 0x0f);
> + hdmi_writeb(hdmi, 0x7c8, 0x02);
> + hdmi_writeb(hdmi, 0x7c9, 0x03);
> + hdmi_writeb(hdmi, 0x7ca, 0x40);
> + hdmi_writeb(hdmi, 0x7dc, 0x31);
> + hdmi_writeb(hdmi, 0x7e2, 0x04);
> + hdmi_writeb(hdmi, 0x7e0, 0x06);
> + hdmi_writeb(hdmi, 0x7cb, 0x68);
> + hdmi_writeb(hdmi, 0x7f9, 0x02);
> + hdmi_writeb(hdmi, 0x7b6, 0x02);
> + hdmi_writeb(hdmi, 0x7f3, 0x0);
> +}
> +
> +static void zx_hdmi_hw_init(struct zx_hdmi *hdmi)
> +{
> + u8 val;
> +
> + /* Software reset */
> + hdmi_writeb(hdmi, PWD_SRST, 1);
> +
> + /* Enable pclk */
> + val = hdmi_readb(hdmi, CLKPWD);
> + val |= CLKPWD_PDIDCK;
> + hdmi_writeb(hdmi, CLKPWD, val);
> +
> + /* Enable HDMI for TX */
> + val = hdmi_readb(hdmi, FUNC_SEL);
> + val |= FUNC_HDMI_EN;
> + hdmi_writeb(hdmi, FUNC_SEL, val);
> +
> + /* Enable deep color packet */
> + val = hdmi_readb(hdmi, P2T_CTRL);
> + val |= P2T_DC_PKT_EN;
> + hdmi_writeb(hdmi, P2T_CTRL, val);
> +
> + /* Enable HDMI/MHL mode for output */
> + val = hdmi_readb(hdmi, TEST_TXCTRL);
> + val |= TEST_TXCTRL_HDMI_MODE;
> + hdmi_writeb(hdmi, TEST_TXCTRL, val);
> +
> + /* Configure reg_qc_sel */
> + hdmi_writeb(hdmi, HDMICTL4, 0x3);
> +
> + /* Enable interrupt */
> + val = hdmi_readb(hdmi, INTR1_MASK);
> + val |= INTR1_MONITOR_DETECT;
> + hdmi_writeb(hdmi, INTR1_MASK, val);
> +
> + /* Clear reset for normal operation */
> + hdmi_writeb(hdmi, PWD_SRST, 0);
> +
> + /* Start up phy */
> + zx_hdmi_phy_start(hdmi);
> +}
> +
> +static int zx_hdmi_bind(struct device *dev, struct device *master, void *data)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct drm_device *drm = data;
> + struct resource *res;
> + struct zx_hdmi *hdmi;
> + struct vou_inf *inf;
> + int irq;
> + int ret;
> +
> + hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
> + if (!hdmi)
> + return -ENOMEM;
> +
> + hdmi->dev = dev;
> + hdmi->drm = drm;
> +
> + inf = &vou_inf_hdmi;
> + inf->encoder = &hdmi->encoder;
> + hdmi->inf = inf;
> +
> + dev_set_drvdata(dev, hdmi);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + hdmi->mmio = devm_ioremap_resource(dev, res);
> + if (IS_ERR(hdmi->mmio))
> + return PTR_ERR(hdmi->mmio);
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + hdmi->cec_clk = devm_clk_get(hdmi->dev, "osc_cec");
> + if (IS_ERR(hdmi->cec_clk))
> + return PTR_ERR(hdmi->cec_clk);
> +
> + hdmi->osc_clk = devm_clk_get(hdmi->dev, "osc_clk");
> + if (IS_ERR(hdmi->osc_clk))
> + return PTR_ERR(hdmi->osc_clk);
> +
> + hdmi->xclk = devm_clk_get(hdmi->dev, "xclk");
> + if (IS_ERR(hdmi->xclk))
> + return PTR_ERR(hdmi->xclk);
> +
> + zx_hdmi_hw_init(hdmi);
> +
> + clk_prepare_enable(hdmi->cec_clk);
> + clk_prepare_enable(hdmi->osc_clk);
> + clk_prepare_enable(hdmi->xclk);
> +
> + ret = zx_hdmi_register(drm, hdmi);
> + if (ret)
> + return ret;
> +
> + ret = devm_request_threaded_irq(dev, irq, zx_hdmi_irq_handler,
> + zx_hdmi_irq_thread, IRQF_SHARED,
> + dev_name(dev), hdmi);
> +
> + return 0;
> +}
> +
> +static void zx_hdmi_unbind(struct device *dev, struct device *master,
> + void *data)
> +{
> + struct zx_hdmi *hdmi = dev_get_drvdata(dev);
> +
> + clk_disable_unprepare(hdmi->cec_clk);
> + clk_disable_unprepare(hdmi->osc_clk);
> + clk_disable_unprepare(hdmi->xclk);
> +}
> +
> +static const struct component_ops zx_hdmi_component_ops = {
> + .bind = zx_hdmi_bind,
> + .unbind = zx_hdmi_unbind,
> +};
> +
> +static int zx_hdmi_probe(struct platform_device *pdev)
> +{
> + return component_add(&pdev->dev, &zx_hdmi_component_ops);
> +}
> +
> +static int zx_hdmi_remove(struct platform_device *pdev)
> +{
> + component_del(&pdev->dev, &zx_hdmi_component_ops);
> + return 0;
> +}
> +
> +static const struct of_device_id zx_hdmi_of_match[] = {
> + { .compatible = "zte,zx296718-hdmi", },
> + { /* end */ },
> +};
> +MODULE_DEVICE_TABLE(of, zx_hdmi_of_match);
> +
> +struct platform_driver zx_hdmi_driver = {
> + .probe = zx_hdmi_probe,
> + .remove = zx_hdmi_remove,
> + .driver = {
> + .name = "zx-hdmi",
> + .of_match_table = zx_hdmi_of_match,
> + },
> +};
> diff --git a/drivers/gpu/drm/zte/zx_plane.c b/drivers/gpu/drm/zte/zx_plane.c
> new file mode 100644
> index 000000000000..326cc1ff7950
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_plane.c
> @@ -0,0 +1,362 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_modeset_helper_vtables.h>
> +#include <drm/drm_plane_helper.h>
> +
> +#include "zx_crtc.h"
> +#include "zx_plane.h"
> +
> +/* GL registers */
> +#define GL_CTRL0 0x00
> +#define GL_UPDATE BIT(5)
> +#define GL_CTRL1 0x04
> +#define GL_DATA_FMT_SHIFT 0
> +#define GL_DATA_FMT_MASK (0xf << GL_DATA_FMT_SHIFT)
> +#define GL_FMT_ARGB8888 0
> +#define GL_FMT_RGB888 1
> +#define GL_FMT_RGB565 2
> +#define GL_FMT_ARGB1555 3
> +#define GL_FMT_ARGB4444 4
> +#define GL_CTRL2 0x08
> +#define GL_GLOBAL_ALPHA_SHIFT 8
> +#define GL_GLOBAL_ALPHA_MASK (0xff << GL_GLOBAL_ALPHA_SHIFT)
> +#define GL_CTRL3 0x0c
> +#define GL_SCALER_BYPASS_MODE BIT(0)
> +#define GL_STRIDE 0x18
> +#define GL_ADDR 0x1c
> +#define GL_SRC_SIZE 0x38
> +#define GL_SRC_W_SHIFT 16
> +#define GL_SRC_W_MASK (0x3fff << GL_SRC_W_SHIFT)
> +#define GL_SRC_H_SHIFT 0
> +#define GL_SRC_H_MASK (0x3fff << GL_SRC_H_SHIFT)
> +#define GL_POS_START 0x9c
> +#define GL_POS_END 0xa0
> +#define GL_POS_X_SHIFT 16
> +#define GL_POS_X_MASK (0x1fff << GL_POS_X_SHIFT)
> +#define GL_POS_Y_SHIFT 0
> +#define GL_POS_Y_MASK (0x1fff << GL_POS_Y_SHIFT)
> +
> +/* CSC registers */
> +#define CSC_CTRL0 0x30
> +#define CSC_COV_MODE_SHIFT 16
> +#define CSC_COV_MODE_MASK (0xffff << CSC_COV_MODE_SHIFT)
> +#define CSC_BT601_IMAGE_RGB2YCBCR 0
> +#define CSC_BT601_IMAGE_YCBCR2RGB 1
> +#define CSC_BT601_VIDEO_RGB2YCBCR 2
> +#define CSC_BT601_VIDEO_YCBCR2RGB 3
> +#define CSC_BT709_IMAGE_RGB2YCBCR 4
> +#define CSC_BT709_IMAGE_YCBCR2RGB 5
> +#define CSC_BT709_VIDEO_RGB2YCBCR 6
> +#define CSC_BT709_VIDEO_YCBCR2RGB 7
> +#define CSC_BT2020_IMAGE_RGB2YCBCR 8
> +#define CSC_BT2020_IMAGE_YCBCR2RGB 9
> +#define CSC_BT2020_VIDEO_RGB2YCBCR 10
> +#define CSC_BT2020_VIDEO_YCBCR2RGB 11
> +#define CSC_WORK_ENABLE BIT(0)
> +
> +/* RSZ registers */
> +#define RSZ_SRC_CFG 0x00
> +#define RSZ_DEST_CFG 0x04
> +#define RSZ_ENABLE_CFG 0x14
> +
> +/* HBSC registers */
> +#define HBSC_SATURATION 0x00
> +#define HBSC_HUE 0x04
> +#define HBSC_BRIGHT 0x08
> +#define HBSC_CONTRAST 0x0c
> +#define HBSC_THRESHOLD_COL1 0x10
> +#define HBSC_THRESHOLD_COL2 0x14
> +#define HBSC_THRESHOLD_COL3 0x18
> +#define HBSC_CTRL0 0x28
> +#define HBSC_CTRL_EN BIT(2)
> +
> +struct zx_plane {
> + struct drm_plane plane;
> + void __iomem *layer;
> + void __iomem *csc;
> + void __iomem *hbsc;
> + void __iomem *rsz;
> +};
> +
> +#define to_zx_plane(plane) container_of(plane, struct zx_plane, plane)
> +
> +static const uint32_t gl_formats[] = {
> + DRM_FORMAT_ARGB8888,
> + DRM_FORMAT_XRGB8888,
> + DRM_FORMAT_RGB888,
> + DRM_FORMAT_RGB565,
> + DRM_FORMAT_ARGB1555,
> + DRM_FORMAT_ARGB4444,
> +};
> +
> +static int zx_gl_plane_atomic_check(struct drm_plane *plane,
> + struct drm_plane_state *state)
> +{
> + u32 src_w, src_h;
> +
> + src_w = state->src_w >> 16;
> + src_h = state->src_h >> 16;
> +
> + /* TODO: support scaling of the plane source */
> + if ((src_w != state->crtc_w) || (src_h != state->crtc_h))
> + return -EINVAL;

This is generally not enough checking. You probably need a call to
drm_plane_helper_check_state.

> +
> + return 0;
> +}
> +
> +static int zx_gl_get_fmt(uint32_t format)
> +{
> + switch (format) {
> + case DRM_FORMAT_ARGB8888:
> + case DRM_FORMAT_XRGB8888:
> + return GL_FMT_ARGB8888;
> + case DRM_FORMAT_RGB888:
> + return GL_FMT_RGB888;
> + case DRM_FORMAT_RGB565:
> + return GL_FMT_RGB565;
> + case DRM_FORMAT_ARGB1555:
> + return GL_FMT_ARGB1555;
> + case DRM_FORMAT_ARGB4444:
> + return GL_FMT_ARGB4444;
> + default:
> + WARN_ONCE(1, "invalid pixel format %d\n", format);
> + return -EINVAL;
> + }
> +}
> +
> +static inline void zx_gl_set_update(struct zx_plane *zplane)
> +{
> + void __iomem *layer = zplane->layer;
> + u32 val;
> +
> + val = readl(layer + GL_CTRL0);
> + val |= GL_UPDATE;
> + writel(val, layer + GL_CTRL0);
> +}
> +
> +static inline void zx_gl_rsz_set_update(struct zx_plane *zplane)
> +{
> + writel(1, zplane->rsz + RSZ_ENABLE_CFG);
> +}
> +
> +void zx_plane_set_update(struct drm_plane *plane)
> +{
> + struct zx_plane *zplane = to_zx_plane(plane);
> +
> + zx_gl_rsz_set_update(zplane);
> + zx_gl_set_update(zplane);
> +}
> +
> +static void zx_gl_rsz_setup(struct zx_plane *zplane, u32 src_w, u32 src_h,
> + u32 dst_w, u32 dst_h)
> +{
> + void __iomem *rsz = zplane->rsz;
> + u32 val;
> +
> + val = ((src_h - 1) & 0xffff) << 16;
> + val |= (src_w - 1) & 0xffff;
> + writel(val, rsz + RSZ_SRC_CFG);
> +
> + val = ((dst_h - 1) & 0xffff) << 16;
> + val |= (dst_w - 1) & 0xffff;
> + writel(val, rsz + RSZ_DEST_CFG);
> +
> + zx_gl_rsz_set_update(zplane);
> +}
> +
> +static void zx_gl_plane_atomic_update(struct drm_plane *plane,
> + struct drm_plane_state *old_state)
> +{
> + struct zx_plane *zplane = to_zx_plane(plane);
> + struct drm_framebuffer *fb = plane->state->fb;
> + struct drm_gem_cma_object *cma_obj;
> + void __iomem *layer = zplane->layer;
> + void __iomem *csc = zplane->csc;
> + void __iomem *hbsc = zplane->hbsc;
> + u32 src_x, src_y, src_w, src_h;
> + u32 dst_x, dst_y, dst_w, dst_h;
> + unsigned int depth, bpp;
> + uint32_t format;
> + dma_addr_t paddr;
> + u32 stride;
> + int fmt;
> + u32 val;
> +
> + if (!fb)
> + return;
> +
> + format = fb->pixel_format;
> + stride = fb->pitches[0];
> +
> + src_x = plane->state->src_x >> 16;
> + src_y = plane->state->src_y >> 16;
> + src_w = plane->state->src_w >> 16;
> + src_h = plane->state->src_h >> 16;
> +
> + dst_x = plane->state->crtc_x;
> + dst_y = plane->state->crtc_y;
> + dst_w = plane->state->crtc_w;
> + dst_h = plane->state->crtc_h;
> +
> + drm_fb_get_bpp_depth(format, &depth, &bpp);
> +
> + cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
> + paddr = cma_obj->paddr + fb->offsets[0];
> + paddr += src_y * stride + src_x * bpp / 8;
> + writel(paddr, layer + GL_ADDR);
> +
> + /* Set up source height/width register */
> + val = (src_w << GL_SRC_W_SHIFT) & GL_SRC_W_MASK;
> + val |= (src_h << GL_SRC_H_SHIFT) & GL_SRC_H_MASK;
> + writel(val, layer + GL_SRC_SIZE);
> +
> + /* Set up start position register */
> + val = (dst_x << GL_POS_X_SHIFT) & GL_POS_X_MASK;
> + val |= (dst_y << GL_POS_Y_SHIFT) & GL_POS_Y_MASK;
> + writel(val, layer + GL_POS_START);
> +
> + /* Set up end position register */
> + val = ((dst_x + dst_w) << GL_POS_X_SHIFT) & GL_POS_X_MASK;
> + val |= ((dst_y + dst_h) << GL_POS_Y_SHIFT) & GL_POS_Y_MASK;
> + writel(val, layer + GL_POS_END);
> +
> + /* Set up stride register */
> + writel(stride & 0xffff, layer + GL_STRIDE);
> +
> + /* Set up graphic layer data format */
> + fmt = zx_gl_get_fmt(format);
> + if (fmt >= 0) {
> + val = readl(layer + GL_CTRL1);
> + val &= ~GL_DATA_FMT_MASK;
> + val |= fmt << GL_DATA_FMT_SHIFT;
> + writel(val, layer + GL_CTRL1);
> + }
> +
> + /* Initialize global alpha with a sane value */
> + val = readl(layer + GL_CTRL2);
> + val &= ~GL_GLOBAL_ALPHA_MASK;
> + val |= 0xff << GL_GLOBAL_ALPHA_SHIFT;
> + writel(val, layer + GL_CTRL2);
> +
> + /* Setup CSC for the GL */
> + val = readl(csc + CSC_CTRL0);
> + val &= ~CSC_COV_MODE_MASK;
> + if (dst_h > 720)
> + val |= CSC_BT709_IMAGE_RGB2YCBCR << CSC_COV_MODE_SHIFT;
> + else
> + val |= CSC_BT601_IMAGE_RGB2YCBCR << CSC_COV_MODE_SHIFT;
> + val |= CSC_WORK_ENABLE;
> + writel(val, csc + CSC_CTRL0);
> +
> + /* Always use scaler since it exists */
> + val = readl(layer + GL_CTRL3);
> + val |= GL_SCALER_BYPASS_MODE; /* set for not bypass */
> + writel(val, layer + GL_CTRL3);
> +
> + zx_gl_rsz_setup(zplane, src_w, src_h, dst_w, dst_h);
> +
> + /* Enable HBSC block */
> + val = readl(hbsc + HBSC_CTRL0);
> + val |= HBSC_CTRL_EN;
> + writel(val, hbsc + HBSC_CTRL0);
> +
> + zx_gl_set_update(zplane);
> +}
> +
> +static const struct drm_plane_helper_funcs zx_gl_plane_helper_funcs = {
> + .atomic_check = zx_gl_plane_atomic_check,
> + .atomic_update = zx_gl_plane_atomic_update,
> +};
> +
> +static void zx_plane_destroy(struct drm_plane *plane)
> +{
> + drm_plane_helper_disable(plane);
> + drm_plane_cleanup(plane);
> +}
> +
> +static const struct drm_plane_funcs zx_plane_funcs = {
> + .update_plane = drm_atomic_helper_update_plane,
> + .disable_plane = drm_atomic_helper_disable_plane,
> + .destroy = zx_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 void zx_plane_hbsc_init(struct zx_plane *zplane)
> +{
> + void __iomem *hbsc = zplane->hbsc;
> +
> + /*
> + * Initialize HBSC block with a sane configuration per recommedation
> + * from ZTE BSP code.
> + */
> + writel(0x200, hbsc + HBSC_SATURATION);
> + writel(0x0, hbsc + HBSC_HUE);
> + writel(0x0, hbsc + HBSC_BRIGHT);
> + writel(0x200, hbsc + HBSC_CONTRAST);
> +
> + writel((0x3ac << 16) | 0x40, hbsc + HBSC_THRESHOLD_COL1);
> + writel((0x3c0 << 16) | 0x40, hbsc + HBSC_THRESHOLD_COL2);
> + writel((0x3c0 << 16) | 0x40, hbsc + HBSC_THRESHOLD_COL3);
> +}
> +
> +struct drm_plane *zx_plane_init(struct drm_device *drm, struct device *dev,
> + struct zx_layer_data *data,
> + enum drm_plane_type type)
> +{
> + const struct drm_plane_helper_funcs *helper;
> + struct zx_plane *zplane;
> + struct drm_plane *plane;
> + const uint32_t *formats;
> + unsigned int format_count;
> + int ret;
> +
> + zplane = devm_kzalloc(dev, sizeof(*zplane), GFP_KERNEL);
> + if (!zplane)
> + return ERR_PTR(-ENOMEM);
> +
> + plane = &zplane->plane;
> +
> + zplane->layer = data->layer;
> + zplane->hbsc = data->hbsc;
> + zplane->csc = data->csc;
> + zplane->rsz = data->rsz;
> +
> + zx_plane_hbsc_init(zplane);
> +
> + switch (type) {
> + case DRM_PLANE_TYPE_PRIMARY:
> + helper = &zx_gl_plane_helper_funcs;
> + formats = gl_formats;
> + format_count = ARRAY_SIZE(gl_formats);
> + break;
> + case DRM_PLANE_TYPE_OVERLAY:
> + /* TODO: add video layer (vl) support */
> + break;
> + default:
> + return ERR_PTR(-ENODEV);
> + }
> +
> + ret = drm_universal_plane_init(drm, plane, VOU_CRTC_MASK,
> + &zx_plane_funcs, formats, format_count,
> + type, NULL);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + drm_plane_helper_add(plane, helper);
> +
> + return plane;
> +}
> diff --git a/drivers/gpu/drm/zte/zx_plane.h b/drivers/gpu/drm/zte/zx_plane.h
> new file mode 100644
> index 000000000000..2b82cd558d9d
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_plane.h
> @@ -0,0 +1,26 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#ifndef __ZX_PLANE_H__
> +#define __ZX_PLANE_H__
> +
> +struct zx_layer_data {
> + void __iomem *layer;
> + void __iomem *csc;
> + void __iomem *hbsc;
> + void __iomem *rsz;
> +};
> +
> +struct drm_plane *zx_plane_init(struct drm_device *drm, struct device *dev,
> + struct zx_layer_data *data,
> + enum drm_plane_type type);
> +void zx_plane_set_update(struct drm_plane *plane);
> +
> +#endif /* __ZX_PLANE_H__ */
> --
> 1.9.1
>

--
Daniel Vetter
Software Engineer, Intel Corporation