[PATCH v2 11/22] drm: mxsfb: Stop using DRM simple display pipeline helper
Stefan Agner
stefan at agner.ch
Thu Jun 11 19:33:11 UTC 2020
On 2020-05-30 05:10, Laurent Pinchart wrote:
> The DRM simple display pipeline helper only supports a single plane. In
> order to prepare for support of the alpha plane on i.MX6SX and i.MX7,
> move away from the helper. No new feature is added.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> ---
> Changes since v1:
>
> - Move after mxsfb_crtc.c rename to mxsfb_kms.c
> ---
> drivers/gpu/drm/mxsfb/mxsfb_drv.c | 108 +++---------------
> drivers/gpu/drm/mxsfb/mxsfb_drv.h | 23 ++--
> drivers/gpu/drm/mxsfb/mxsfb_kms.c | 184 +++++++++++++++++++++++++++---
> 3 files changed, 197 insertions(+), 118 deletions(-)
>
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> index 204c1e52e9aa..a8da92976d13 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> @@ -10,22 +10,23 @@
>
> #include <linux/clk.h>
> #include <linux/dma-mapping.h>
> +#include <linux/io.h>
> #include <linux/module.h>
> #include <linux/of_device.h>
> +#include <linux/platform_device.h>
> #include <linux/pm_runtime.h>
> -#include <linux/spinlock.h>
>
> -#include <drm/drm_atomic.h>
> #include <drm/drm_atomic_helper.h>
> -#include <drm/drm_crtc.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_connector.h>
> #include <drm/drm_drv.h>
> #include <drm/drm_fb_helper.h>
> #include <drm/drm_gem_cma_helper.h>
> #include <drm/drm_gem_framebuffer_helper.h>
> #include <drm/drm_irq.h>
> +#include <drm/drm_mode_config.h>
> #include <drm/drm_of.h>
> #include <drm/drm_probe_helper.h>
> -#include <drm/drm_simple_kms_helper.h>
> #include <drm/drm_vblank.h>
>
> #include "mxsfb_drv.h"
> @@ -57,17 +58,6 @@ static const struct mxsfb_devdata mxsfb_devdata[] = {
> },
> };
>
> -static const uint32_t mxsfb_formats[] = {
> - DRM_FORMAT_XRGB8888,
> - DRM_FORMAT_RGB565
> -};
> -
> -static struct mxsfb_drm_private *
> -drm_pipe_to_mxsfb_drm_private(struct drm_simple_display_pipe *pipe)
> -{
> - return container_of(pipe, struct mxsfb_drm_private, pipe);
> -}
> -
> void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)
> {
> if (mxsfb->clk_axi)
> @@ -90,77 +80,6 @@ static const struct drm_mode_config_helper_funcs
> mxsfb_mode_config_helpers = {
> .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
> };
>
> -static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
> - struct drm_crtc_state *crtc_state,
> - struct drm_plane_state *plane_state)
> -{
> - struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
> - struct drm_device *drm = pipe->plane.dev;
> -
> - pm_runtime_get_sync(drm->dev);
> - mxsfb_crtc_enable(mxsfb);
> -}
> -
> -static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
> -{
> - struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
> - struct drm_device *drm = pipe->plane.dev;
> - struct drm_crtc *crtc = &pipe->crtc;
> - struct drm_pending_vblank_event *event;
> -
> - mxsfb_crtc_disable(mxsfb);
> - pm_runtime_put_sync(drm->dev);
> -
> - spin_lock_irq(&drm->event_lock);
> - event = crtc->state->event;
> - if (event) {
> - crtc->state->event = NULL;
> - drm_crtc_send_vblank_event(crtc, event);
> - }
> - spin_unlock_irq(&drm->event_lock);
> -}
> -
> -static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,
> - struct drm_plane_state *plane_state)
> -{
> - struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
> -
> - mxsfb_plane_atomic_update(mxsfb, plane_state);
> -}
> -
> -static int mxsfb_pipe_enable_vblank(struct drm_simple_display_pipe *pipe)
> -{
> - struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
> -
> - /* Clear and enable VBLANK IRQ */
> - mxsfb_enable_axi_clk(mxsfb);
> - writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
> - writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
> - mxsfb_disable_axi_clk(mxsfb);
> -
> - return 0;
> -}
> -
> -static void mxsfb_pipe_disable_vblank(struct drm_simple_display_pipe *pipe)
> -{
> - struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
> -
> - /* Disable and clear VBLANK IRQ */
> - mxsfb_enable_axi_clk(mxsfb);
> - writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
> - writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
> - mxsfb_disable_axi_clk(mxsfb);
> -}
> -
> -static struct drm_simple_display_pipe_funcs mxsfb_funcs = {
> - .enable = mxsfb_pipe_enable,
> - .disable = mxsfb_pipe_disable,
> - .update = mxsfb_pipe_update,
> - .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
> - .enable_vblank = mxsfb_pipe_enable_vblank,
> - .disable_vblank = mxsfb_pipe_disable_vblank,
> -};
> -
> static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)
> {
> struct drm_device *drm = mxsfb->drm;
> @@ -183,7 +102,7 @@ static int mxsfb_attach_bridge(struct
> mxsfb_drm_private *mxsfb)
> if (!bridge)
> return -ENODEV;
>
> - ret = drm_simple_display_pipe_attach_bridge(&mxsfb->pipe, bridge);
> + ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0);
> if (ret) {
> DRM_DEV_ERROR(drm->dev,
> "failed to attach bridge: %d\n", ret);
> @@ -250,10 +169,9 @@ static int mxsfb_load(struct drm_device *drm,
> unsigned long flags)
> /* Modeset init */
> drm_mode_config_init(drm);
>
> - ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs,
> - mxsfb_formats, ARRAY_SIZE(mxsfb_formats), NULL, NULL);
> + ret = mxsfb_kms_init(mxsfb);
> if (ret < 0) {
> - dev_err(drm->dev, "Cannot setup simple display pipe\n");
> + dev_err(drm->dev, "Failed to initialize KMS pipeline\n");
> goto err_vblank;
> }
>
> @@ -309,11 +227,11 @@ static void mxsfb_unload(struct drm_device *drm)
> pm_runtime_disable(drm->dev);
> }
>
> -static void mxsfb_irq_preinstall(struct drm_device *drm)
> +static void mxsfb_irq_disable(struct drm_device *drm)
> {
> struct mxsfb_drm_private *mxsfb = drm->dev_private;
>
> - mxsfb_pipe_disable_vblank(&mxsfb->pipe);
> + mxsfb->crtc.funcs->disable_vblank(&mxsfb->crtc);
> }
>
> static irqreturn_t mxsfb_irq_handler(int irq, void *data)
> @@ -327,7 +245,7 @@ static irqreturn_t mxsfb_irq_handler(int irq, void *data)
> reg = readl(mxsfb->base + LCDC_CTRL1);
>
> if (reg & CTRL1_CUR_FRAME_DONE_IRQ)
> - drm_crtc_handle_vblank(&mxsfb->pipe.crtc);
> + drm_crtc_handle_vblank(&mxsfb->crtc);
>
> writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
>
> @@ -341,8 +259,8 @@ DEFINE_DRM_GEM_CMA_FOPS(fops);
> static struct drm_driver mxsfb_driver = {
> .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
> .irq_handler = mxsfb_irq_handler,
> - .irq_preinstall = mxsfb_irq_preinstall,
> - .irq_uninstall = mxsfb_irq_preinstall,
> + .irq_preinstall = mxsfb_irq_disable,
> + .irq_uninstall = mxsfb_irq_disable,
> .gem_free_object_unlocked = drm_gem_cma_free_object,
> .gem_vm_ops = &drm_gem_cma_vm_ops,
> .dumb_create = drm_gem_cma_dumb_create,
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.h
> b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
> index 0e3e5a63bbf9..edd766ad254f 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.h
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
> @@ -8,7 +8,12 @@
> #ifndef __MXSFB_DRV_H__
> #define __MXSFB_DRV_H__
>
> -struct drm_device;
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_device.h>
> +#include <drm/drm_encoder.h>
> +#include <drm/drm_plane.h>
> +
> +struct clk;
>
> struct mxsfb_devdata {
> unsigned int transfer_count;
> @@ -29,20 +34,22 @@ struct mxsfb_drm_private {
> struct clk *clk_disp_axi;
>
> struct drm_device *drm;
> - struct drm_simple_display_pipe pipe;
> + struct drm_plane plane;
> + struct drm_crtc crtc;
> + struct drm_encoder encoder;
> struct drm_connector *connector;
> struct drm_bridge *bridge;
> };
>
> -int mxsfb_setup_crtc(struct drm_device *dev);
> -int mxsfb_create_output(struct drm_device *dev);
> +static inline struct mxsfb_drm_private *
> +to_mxsfb_drm_private(struct drm_device *drm)
> +{
> + return drm->dev_private;
> +}
>
> void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb);
> void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb);
>
> -void mxsfb_crtc_enable(struct mxsfb_drm_private *mxsfb);
> -void mxsfb_crtc_disable(struct mxsfb_drm_private *mxsfb);
> -void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb,
> - struct drm_plane_state *state);
> +int mxsfb_kms_init(struct mxsfb_drm_private *mxsfb);
>
> #endif /* __MXSFB_DRV_H__ */
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> index c4f1575b4210..8f339adb8d04 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> @@ -9,15 +9,21 @@
> */
>
> #include <linux/clk.h>
> +#include <linux/io.h>
> #include <linux/iopoll.h>
> +#include <linux/pm_runtime.h>
> #include <linux/spinlock.h>
>
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> #include <drm/drm_bridge.h>
> #include <drm/drm_crtc.h>
> +#include <drm/drm_encoder.h>
> #include <drm/drm_fb_cma_helper.h>
> #include <drm/drm_fourcc.h>
> #include <drm/drm_gem_cma_helper.h>
> -#include <drm/drm_simple_kms_helper.h>
> +#include <drm/drm_plane.h>
> +#include <drm/drm_plane_helper.h>
> #include <drm/drm_vblank.h>
>
> #include "mxsfb_drv.h"
> @@ -26,6 +32,10 @@
> /* 1 second delay should be plenty of time for block reset */
> #define RESET_TIMEOUT 1000000
>
> +/*
> -----------------------------------------------------------------------------
> + * CRTC
> + */
> +
> static u32 set_hsync_pulse_width(struct mxsfb_drm_private *mxsfb, u32 val)
> {
> return (val & mxsfb->devdata->hs_wdth_mask) <<
> @@ -35,9 +45,8 @@ static u32 set_hsync_pulse_width(struct
> mxsfb_drm_private *mxsfb, u32 val)
> /* Setup the MXSFB registers for decoding the pixels out of the framebuffer */
> static int mxsfb_set_pixel_fmt(struct mxsfb_drm_private *mxsfb)
> {
> - struct drm_crtc *crtc = &mxsfb->pipe.crtc;
> - struct drm_device *drm = crtc->dev;
> - const u32 format = crtc->primary->state->fb->format->format;
> + struct drm_device *drm = mxsfb->drm;
> + const u32 format = mxsfb->crtc.primary->state->fb->format->format;
> u32 ctrl, ctrl1;
>
> ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER;
> @@ -71,8 +80,7 @@ static int mxsfb_set_pixel_fmt(struct
> mxsfb_drm_private *mxsfb)
>
> static void mxsfb_set_bus_fmt(struct mxsfb_drm_private *mxsfb)
> {
> - struct drm_crtc *crtc = &mxsfb->pipe.crtc;
> - struct drm_device *drm = crtc->dev;
> + struct drm_device *drm = mxsfb->drm;
> u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
> u32 reg;
>
> @@ -175,7 +183,7 @@ static int mxsfb_reset_block(struct
> mxsfb_drm_private *mxsfb)
>
> static dma_addr_t mxsfb_get_fb_paddr(struct mxsfb_drm_private *mxsfb)
> {
> - struct drm_framebuffer *fb = mxsfb->pipe.plane.state->fb;
> + struct drm_framebuffer *fb = mxsfb->plane.state->fb;
> struct drm_gem_cma_object *gem;
>
> if (!fb)
> @@ -190,8 +198,8 @@ static dma_addr_t mxsfb_get_fb_paddr(struct
> mxsfb_drm_private *mxsfb)
>
> static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb)
> {
> - struct drm_device *drm = mxsfb->pipe.crtc.dev;
> - struct drm_display_mode *m = &mxsfb->pipe.crtc.state->adjusted_mode;
> + struct drm_device *drm = mxsfb->crtc.dev;
> + struct drm_display_mode *m = &mxsfb->crtc.state->adjusted_mode;
> u32 bus_flags = mxsfb->connector->display_info.bus_flags;
> u32 vdctrl0, vsync_pulse_len, hsync_pulse_len;
> int err;
> @@ -273,10 +281,29 @@ static void mxsfb_crtc_mode_set_nofb(struct
> mxsfb_drm_private *mxsfb)
> mxsfb->base + LCDC_VDCTRL4);
> }
>
> -void mxsfb_crtc_enable(struct mxsfb_drm_private *mxsfb)
> +static int mxsfb_crtc_atomic_check(struct drm_crtc *crtc,
> + struct drm_crtc_state *state)
> {
> + bool has_primary = state->plane_mask &
> + drm_plane_mask(crtc->primary);
> +
> + /* The primary plane has to be enabled when the CRTC is active. */
> + if (has_primary != state->active)
> + return -EINVAL;
This actually fails some of the igt subtests of kms_vblank.
I think it has to be:
if (state->active && !has_primary)
With that, all kms_vblank tests succeed (or are skipped).
With that fixed:
Reviewed-by: Stefan Agner <stefan at agner.ch>
--
Stefan
> +
> + /* TODO: Is this needed ? */
> + return drm_atomic_add_affected_planes(state->state, crtc);
> +}
> +
> +static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
> + struct drm_crtc_state *old_state)
> +{
> + struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev);
> + struct drm_device *drm = mxsfb->drm;
> dma_addr_t paddr;
>
> + pm_runtime_get_sync(drm->dev);
> +
> mxsfb_enable_axi_clk(mxsfb);
> mxsfb_crtc_mode_set_nofb(mxsfb);
>
> @@ -290,17 +317,100 @@ void mxsfb_crtc_enable(struct mxsfb_drm_private *mxsfb)
> mxsfb_enable_controller(mxsfb);
> }
>
> -void mxsfb_crtc_disable(struct mxsfb_drm_private *mxsfb)
> +static void mxsfb_crtc_atomic_disable(struct drm_crtc *crtc,
> + struct drm_crtc_state *old_state)
> {
> + struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev);
> + struct drm_device *drm = mxsfb->drm;
> + struct drm_pending_vblank_event *event;
> +
> mxsfb_disable_controller(mxsfb);
> mxsfb_disable_axi_clk(mxsfb);
> +
> + pm_runtime_put_sync(drm->dev);
> +
> + spin_lock_irq(&drm->event_lock);
> + event = crtc->state->event;
> + if (event) {
> + crtc->state->event = NULL;
> + drm_crtc_send_vblank_event(crtc, event);
> + }
> + spin_unlock_irq(&drm->event_lock);
> +}
> +
> +static int mxsfb_crtc_enable_vblank(struct drm_crtc *crtc)
> +{
> + struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev);
> +
> + /* Clear and enable VBLANK IRQ */
> + mxsfb_enable_axi_clk(mxsfb);
> + writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
> + writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
> + mxsfb_disable_axi_clk(mxsfb);
> +
> + return 0;
> +}
> +
> +static void mxsfb_crtc_disable_vblank(struct drm_crtc *crtc)
> +{
> + struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev);
> +
> + /* Disable and clear VBLANK IRQ */
> + mxsfb_enable_axi_clk(mxsfb);
> + writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
> + writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
> + mxsfb_disable_axi_clk(mxsfb);
> +}
> +
> +static const struct drm_crtc_helper_funcs mxsfb_crtc_helper_funcs = {
> + .atomic_check = mxsfb_crtc_atomic_check,
> + .atomic_enable = mxsfb_crtc_atomic_enable,
> + .atomic_disable = mxsfb_crtc_atomic_disable,
> +};
> +
> +static const struct drm_crtc_funcs mxsfb_crtc_funcs = {
> + .reset = drm_atomic_helper_crtc_reset,
> + .destroy = drm_crtc_cleanup,
> + .set_config = drm_atomic_helper_set_config,
> + .page_flip = drm_atomic_helper_page_flip,
> + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> + .enable_vblank = mxsfb_crtc_enable_vblank,
> + .disable_vblank = mxsfb_crtc_disable_vblank,
> +};
> +
> +/*
> -----------------------------------------------------------------------------
> + * Encoder
> + */
> +
> +static const struct drm_encoder_funcs mxsfb_encoder_funcs = {
> + .destroy = drm_encoder_cleanup,
> +};
> +
> +/*
> -----------------------------------------------------------------------------
> + * Planes
> + */
> +
> +static int mxsfb_plane_atomic_check(struct drm_plane *plane,
> + struct drm_plane_state *plane_state)
> +{
> + struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev);
> + struct drm_crtc_state *crtc_state;
> +
> + crtc_state = drm_atomic_get_new_crtc_state(plane_state->state,
> + &mxsfb->crtc);
> +
> + return drm_atomic_helper_check_plane_state(plane_state, crtc_state,
> + DRM_PLANE_HELPER_NO_SCALING,
> + DRM_PLANE_HELPER_NO_SCALING,
> + false, true);
> }
>
> -void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb,
> - struct drm_plane_state *state)
> +static void mxsfb_plane_atomic_update(struct drm_plane *plane,
> + struct drm_plane_state *old_pstate)
> {
> - struct drm_simple_display_pipe *pipe = &mxsfb->pipe;
> - struct drm_crtc *crtc = &pipe->crtc;
> + struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev);
> + struct drm_crtc *crtc = &mxsfb->crtc;
> struct drm_pending_vblank_event *event;
> dma_addr_t paddr;
>
> @@ -324,3 +434,47 @@ void mxsfb_plane_atomic_update(struct
> mxsfb_drm_private *mxsfb,
> mxsfb_disable_axi_clk(mxsfb);
> }
> }
> +
> +static const struct drm_plane_helper_funcs mxsfb_plane_helper_funcs = {
> + .atomic_check = mxsfb_plane_atomic_check,
> + .atomic_update = mxsfb_plane_atomic_update,
> +};
> +
> +static const struct drm_plane_funcs mxsfb_plane_funcs = {
> + .update_plane = drm_atomic_helper_update_plane,
> + .disable_plane = drm_atomic_helper_disable_plane,
> + .destroy = drm_plane_cleanup,
> + .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 const uint32_t mxsfb_formats[] = {
> + DRM_FORMAT_XRGB8888,
> + DRM_FORMAT_RGB565
> +};
> +
> +int mxsfb_kms_init(struct mxsfb_drm_private *mxsfb)
> +{
> + struct drm_encoder *encoder = &mxsfb->encoder;
> + struct drm_plane *plane = &mxsfb->plane;
> + struct drm_crtc *crtc = &mxsfb->crtc;
> + int ret;
> +
> + drm_plane_helper_add(plane, &mxsfb_plane_helper_funcs);
> + ret = drm_universal_plane_init(mxsfb->drm, plane, 0, &mxsfb_plane_funcs,
> + mxsfb_formats, ARRAY_SIZE(mxsfb_formats),
> + NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
> + if (ret)
> + return ret;
> +
> + drm_crtc_helper_add(crtc, &mxsfb_crtc_helper_funcs);
> + ret = drm_crtc_init_with_planes(mxsfb->drm, crtc, plane, NULL,
> + &mxsfb_crtc_funcs, NULL);
> + if (ret)
> + return ret;
> +
> + encoder->possible_crtcs = drm_crtc_mask(crtc);
> + return drm_encoder_init(mxsfb->drm, encoder, &mxsfb_encoder_funcs,
> + DRM_MODE_ENCODER_NONE, NULL);
> +}
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