[PATCH v3] drm/komeda: Add writeback support

james qian wang (Arm Technology China)
2019-05-16T08:13:40Z

Komeda driver uses a individual component to describe the HW's writeback
caps, but drivers doesn't define a new structure and still uses the
existing "struct komeda_layer" to describe this new component.
The detailed changes as follow:

1. Initialize wb_layer according to HW and report it to CORE.
2. CORE exposes wb_layer as a resource to KMS by private_obj.
3. Report writeback supporting by add a wb_connector to KMS, and then
wb_connector will take act as a component resources user,
so the func komeda_wb_encoder_atomic_check claims komeda resources
(scaler and wb_layer) accroding to its state configuration to the
wb_connector. and the wb_state configuration will be validated on the
specific component resources to see if the caps of component can
meet the requirement of wb_connector. if not check failed.
4. Update irq_handler to notify the completion of writeback.

NOTE:
This change doesn't add scaling writeback support, that support will
be added in the future after the scaler support.

v2: Rebase
v3: Rebase and constify the d71_wb_layer_funcs

Depends on:
- https://patchwork.freedesktop.org/series/59915/

Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
---
drivers/gpu/drm/arm/display/komeda/Makefile | 1 +
.../arm/display/komeda/d71/d71_component.c | 90 ++++++++-
.../gpu/drm/arm/display/komeda/komeda_crtc.c | 15 ++
.../arm/display/komeda/komeda_framebuffer.c | 19 ++
.../gpu/drm/arm/display/komeda/komeda_kms.c | 4 +
.../gpu/drm/arm/display/komeda/komeda_kms.h | 27 +++
.../drm/arm/display/komeda/komeda_pipeline.h | 7 +
.../display/komeda/komeda_pipeline_state.c | 51 ++++-
.../arm/display/komeda/komeda_private_obj.c | 6 +
.../arm/display/komeda/komeda_wb_connector.c | 181 ++++++++++++++++++
10 files changed, 398 insertions(+), 3 deletions(-)
create mode 100644 drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c

diff --git a/drivers/gpu/drm/arm/display/komeda/Makefile b/drivers/gpu/drm/arm/display/komeda/Makefile
index 62bd1bff66a3..d7e29fc688c3 100644
--- a/drivers/gpu/drm/arm/display/komeda/Makefile
+++ b/drivers/gpu/drm/arm/display/komeda/Makefile
@@ -14,6 +14,7 @@ komeda-y := \
komeda_kms.o \
komeda_crtc.o \
komeda_plane.o \
+ komeda_wb_connector.o \
komeda_private_obj.o

komeda-y += \
diff --git a/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c b/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
index 6bab816ed8e7..67e698d0e6aa 100644
--- a/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
+++ b/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
@@ -288,10 +288,98 @@ static int d71_layer_init(struct d71_dev *d71,
return 0;
}

+static void d71_wb_layer_update(struct komeda_component *c,
+ struct komeda_component_state *state)
+{
+ struct komeda_layer_state *st = to_layer_st(state);
+ struct drm_connector_state *conn_st = state->wb_conn->state;
+ struct drm_framebuffer *fb = conn_st->writeback_job->fb;
+ struct komeda_fb *kfb = to_kfb(fb);
+ u32 __iomem *reg = c->reg;
+ u32 ctrl = L_EN | LW_OFM, mask = L_EN | LW_OFM | LW_TBU_EN;
+ int i;
+
+ for (i = 0; i < fb->format->num_planes; i++) {
+ malidp_write32(reg + i * LAYER_PER_PLANE_REGS, BLK_P0_PTR_LOW,
+ lower_32_bits(st->addr[i]));
+ malidp_write32(reg + i * LAYER_PER_PLANE_REGS, BLK_P0_PTR_HIGH,
+ upper_32_bits(st->addr[i]));
+
+ malidp_write32(reg + i * LAYER_PER_PLANE_REGS, BLK_P0_STRIDE,
+ fb->pitches[i] & 0xFFFF);
+ }
+
+ malidp_write32(reg, LAYER_FMT, kfb->format_caps->hw_id);
+ malidp_write32(reg, BLK_IN_SIZE, HV_SIZE(st->hsize, st->vsize));
+ malidp_write32(reg, BLK_INPUT_ID0, to_d71_input_id(&state->inputs[0]));
+ malidp_write32_mask(reg, BLK_CONTROL, mask, ctrl);
+}
+
+static void d71_wb_layer_dump(struct komeda_component *c, struct seq_file *sf)
+{
+ u32 v[12], i;
+
+ dump_block_header(sf, c->reg);
+
+ get_values_from_reg(c->reg, 0x80, 1, v);
+ seq_printf(sf, "LW_INPUT_ID0:\t\t0x%X\n", v[0]);
+
+ get_values_from_reg(c->reg, 0xD0, 3, v);
+ seq_printf(sf, "LW_CONTROL:\t\t0x%X\n", v[0]);
+ seq_printf(sf, "LW_PROG_LINE:\t\t0x%X\n", v[1]);
+ seq_printf(sf, "LW_FORMAT:\t\t0x%X\n", v[2]);
+
+ get_values_from_reg(c->reg, 0xE0, 1, v);
+ seq_printf(sf, "LW_IN_SIZE:\t\t0x%X\n", v[0]);
+
+ for (i = 0; i < 2; i++) {
+ get_values_from_reg(c->reg, 0x100 + i * 0x10, 3, v);
+ seq_printf(sf, "LW_P%u_PTR_LOW:\t\t0x%X\n", i, v[0]);
+ seq_printf(sf, "LW_P%u_PTR_HIGH:\t\t0x%X\n", i, v[1]);
+ seq_printf(sf, "LW_P%u_STRIDE:\t\t0x%X\n", i, v[2]);
+ }
+
+ get_values_from_reg(c->reg, 0x130, 12, v);
+ for (i = 0; i < 12; i++)
+ seq_printf(sf, "LW_RGB_YUV_COEFF%u:\t0x%X\n", i, v[i]);
+}
+
+static void d71_wb_layer_disable(struct komeda_component *c)
+{
+ malidp_write32(c->reg, BLK_INPUT_ID0, 0);
+ malidp_write32_mask(c->reg, BLK_CONTROL, L_EN, 0);
+}
+
+static const struct komeda_component_funcs d71_wb_layer_funcs = {
+ .update = d71_wb_layer_update,
+ .disable = d71_wb_layer_disable,
+ .dump_register = d71_wb_layer_dump,
+};
+
static int d71_wb_layer_init(struct d71_dev *d71,
struct block_header *blk, u32 __iomem *reg)
{
- DRM_DEBUG("Detect D71_Wb_Layer.\n");
+ struct komeda_component *c;
+ struct komeda_layer *wb_layer;
+ u32 pipe_id, layer_id;
+
+ get_resources_id(blk->block_info, &pipe_id, &layer_id);
+
+ c = komeda_component_add(&d71->pipes[pipe_id]->base, sizeof(*wb_layer),
+ layer_id, BLOCK_INFO_INPUT_ID(blk->block_info),
+ &d71_wb_layer_funcs,
+ 1, get_valid_inputs(blk), 0, reg,
+ "LPU%d_LAYER_WR", pipe_id);
+ if (!c) {
+ DRM_ERROR("Failed to add wb_layer component\n");
+ return -EINVAL;
+ }
+
+ wb_layer = to_layer(c);
+ wb_layer->layer_type = KOMEDA_FMT_WB_LAYER;
+
+ set_range(&wb_layer->hsize_in, D71_MIN_LINE_SIZE, d71->max_line_size);
+ set_range(&wb_layer->vsize_in, D71_MIN_VERTICAL_SIZE, d71->max_vsize);

return 0;
}
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
index 284ce079d8c4..6712603b8c7a 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
@@ -165,6 +165,15 @@ void komeda_crtc_handle_event(struct komeda_crtc *kcrtc,
if (events & KOMEDA_EVENT_VSYNC)
drm_crtc_handle_vblank(crtc);

+ if (events & KOMEDA_EVENT_EOW) {
+ struct komeda_wb_connector *wb_conn = kcrtc->wb_conn;
+
+ if (wb_conn)
+ drm_writeback_signal_completion(&wb_conn->base, 0);
+ else
+ DRM_WARN("CRTC[%d]: EOW happen but no wb_connector.\n",
+ drm_crtc_index(&kcrtc->base));
+ }
/* will handle it together with the write back support */
if (events & KOMEDA_EVENT_EOW)
DRM_DEBUG("EOW.\n");
@@ -201,6 +210,8 @@ komeda_crtc_do_flush(struct drm_crtc *crtc,
struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc->state);
struct komeda_dev *mdev = kcrtc->base.dev->dev_private;
struct komeda_pipeline *master = kcrtc->master;
+ struct komeda_wb_connector *wb_conn = kcrtc->wb_conn;
+ struct drm_connector_state *conn_st;

DRM_DEBUG_ATOMIC("CRTC%d_FLUSH: active_pipes: 0x%x, affected: 0x%x.\n",
drm_crtc_index(crtc),
@@ -210,6 +221,10 @@ komeda_crtc_do_flush(struct drm_crtc *crtc,
if (has_bit(master->id, kcrtc_st->affected_pipes))
komeda_pipeline_update(master, old->state);

+ conn_st = wb_conn ? wb_conn->base.base.state : NULL;
+ if (conn_st && conn_st->writeback_job)
+ drm_writeback_queue_job(&wb_conn->base, conn_st);
+
/* step 2: notify the HW to kickoff the update */
mdev->funcs->flush(mdev, master->id, kcrtc_st->active_pipes);
}
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
index 9cc9935024f7..4d8160cf09c3 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
@@ -165,3 +165,22 @@ komeda_fb_get_pixel_addr(struct komeda_fb *kfb, int x, int y, int plane)

return obj->paddr + offset;
}
+
+/* if the fb can be supported by a specific layer */
+bool komeda_fb_is_layer_supported(struct komeda_fb *kfb, u32 layer_type)
+{
+ struct drm_framebuffer *fb = &kfb->base;
+ struct komeda_dev *mdev = fb->dev->dev_private;
+ const struct komeda_format_caps *caps;
+ u32 fourcc = fb->format->format;
+ u64 modifier = fb->modifier;
+
+ caps = komeda_get_format_caps(&mdev->fmt_tbl, fourcc, modifier);
+ if (!caps)
+ return false;
+
+ if (!(caps->supported_layer_types & layer_type))
+ return false;
+
+ return true;
+}
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
index 86f6542afb40..3e58901fb776 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
@@ -188,6 +188,10 @@ struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
if (err)
goto cleanup_mode_config;

+ err = komeda_kms_add_wb_connectors(kms, mdev);
+ if (err)
+ goto cleanup_mode_config;
+
err = component_bind_all(mdev->dev, kms);
if (err)
goto cleanup_mode_config;
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
index ac3d9209b4d9..f16e9e577593 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
@@ -12,6 +12,7 @@
#include <drm/drm_crtc_helper.h>
#include <drm/drm_device.h>
#include <drm/drm_writeback.h>
+#include <drm/drm_print.h>
#include <video/videomode.h>
#include <video/display_timing.h>

@@ -73,6 +74,9 @@ struct komeda_crtc {
*/
struct komeda_pipeline *slave;

+ /** @wb_conn: komeda write back connector */
+ struct komeda_wb_connector *wb_conn;
+
/** @disable_done: this flip_done is for tracing the disable */
struct completion *disable_done;
};
@@ -116,6 +120,27 @@ struct komeda_kms_dev {
#define to_kcrtc(p) container_of(p, struct komeda_crtc, base)
#define to_kcrtc_st(p) container_of(p, struct komeda_crtc_state, base)
#define to_kdev(p) container_of(p, struct komeda_kms_dev, base)
+#define to_wb_conn(x) container_of(x, struct drm_writeback_connector, base)
+
+static inline bool is_writeback_only(struct drm_crtc_state *st)
+{
+ struct komeda_wb_connector *wb_conn = to_kcrtc(st->crtc)->wb_conn;
+ struct drm_connector *conn = wb_conn ? &wb_conn->base.base : NULL;
+
+ return conn && (st->connector_mask == BIT(drm_connector_index(conn)));
+}
+
+static inline bool
+is_only_changed_connector(struct drm_crtc_state *st, struct drm_connector *conn)
+{
+ struct drm_crtc_state *old_st;
+ u32 changed_connectors;
+
+ old_st = drm_atomic_get_old_crtc_state(st->state, st->crtc);
+ changed_connectors = st->connector_mask ^ old_st->connector_mask;
+
+ return BIT(drm_connector_index(conn)) == changed_connectors;
+}

int komeda_kms_setup_crtcs(struct komeda_kms_dev *kms, struct komeda_dev *mdev);

@@ -123,6 +148,8 @@ int komeda_kms_add_crtcs(struct komeda_kms_dev *kms, struct komeda_dev *mdev);
int komeda_kms_add_planes(struct komeda_kms_dev *kms, struct komeda_dev *mdev);
int komeda_kms_add_private_objs(struct komeda_kms_dev *kms,
struct komeda_dev *mdev);
+int komeda_kms_add_wb_connectors(struct komeda_kms_dev *kms,
+ struct komeda_dev *mdev);
void komeda_kms_cleanup_private_objs(struct komeda_kms_dev *kms);

void komeda_crtc_handle_event(struct komeda_crtc *kcrtc,
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
index bae8a32b81a6..1b7e933ea303 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
@@ -423,10 +423,17 @@ struct komeda_plane_state;
struct komeda_crtc_state;
struct komeda_crtc;

+void pipeline_composition_size(struct komeda_crtc_state *kcrtc_st,
+ u16 *hsize, u16 *vsize);
+
int komeda_build_layer_data_flow(struct komeda_layer *layer,
struct komeda_plane_state *kplane_st,
struct komeda_crtc_state *kcrtc_st,
struct komeda_data_flow_cfg *dflow);
+int komeda_build_wb_data_flow(struct komeda_layer *wb_layer,
+ struct drm_connector_state *conn_st,
+ struct komeda_crtc_state *kcrtc_st,
+ struct komeda_data_flow_cfg *dflow);
int komeda_build_display_data_flow(struct komeda_crtc *kcrtc,
struct komeda_crtc_state *kcrtc_st);

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
index 36570d7dad61..9748c9438868 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
@@ -308,8 +308,41 @@ komeda_layer_validate(struct komeda_layer *layer,
return 0;
}

-static void pipeline_composition_size(struct komeda_crtc_state *kcrtc_st,
- u16 *hsize, u16 *vsize)
+static int
+komeda_wb_layer_validate(struct komeda_layer *wb_layer,
+ struct drm_connector_state *conn_st,
+ struct komeda_data_flow_cfg *dflow)
+{
+ struct komeda_fb *kfb = to_kfb(conn_st->writeback_job->fb);
+ struct komeda_component_state *c_st;
+ struct komeda_layer_state *st;
+ int i;
+
+ if (!komeda_fb_is_layer_supported(kfb, wb_layer->layer_type))
+ return -EINVAL;
+
+ c_st = komeda_component_get_state_and_set_user(&wb_layer->base,
+ conn_st->state, conn_st->connector, conn_st->crtc);
+ if (IS_ERR(c_st))
+ return PTR_ERR(c_st);
+
+ st = to_layer_st(c_st);
+
+ st->hsize = dflow->out_w;
+ st->vsize = dflow->out_h;
+
+ for (i = 0; i < kfb->base.format->num_planes; i++)
+ st->addr[i] = komeda_fb_get_pixel_addr(kfb, dflow->out_x,
+ dflow->out_y, i);
+
+ komeda_component_add_input(&st->base, &dflow->input, 0);
+ komeda_component_set_output(&dflow->input, &wb_layer->base, 0);
+
+ return 0;
+}
+
+void pipeline_composition_size(struct komeda_crtc_state *kcrtc_st,
+ u16 *hsize, u16 *vsize)
{
struct drm_display_mode *m = &kcrtc_st->base.adjusted_mode;

@@ -478,6 +511,20 @@ int komeda_build_layer_data_flow(struct komeda_layer *layer,
return err;
}

+int komeda_build_wb_data_flow(struct komeda_layer *wb_layer,
+ struct drm_connector_state *conn_st,
+ struct komeda_crtc_state *kcrtc_st,
+ struct komeda_data_flow_cfg *dflow)
+{
+ if ((dflow->in_w != dflow->out_w) ||
+ (dflow->in_h != dflow->out_h)) {
+ DRM_DEBUG_ATOMIC("current do not support scaling writeback.\n");
+ return -EINVAL;
+ }
+
+ return komeda_wb_layer_validate(wb_layer, conn_st, dflow);
+}
+
/* build display output data flow, the data path is:
* compiz -> improc -> timing_ctrlr
*/
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c b/drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c
index a54878cbd6e4..d53bd6c23c5d 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c
@@ -252,6 +252,12 @@ int komeda_kms_add_private_objs(struct komeda_kms_dev *kms,
return err;
}

+ if (pipe->wb_layer) {
+ err = komeda_layer_obj_add(kms, pipe->wb_layer);
+ if (err)
+ return err;
+ }
+
err = komeda_compiz_obj_add(kms, pipe->compiz);
if (err)
return err;
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c b/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
new file mode 100644
index 000000000000..0c1a4220c280
--- /dev/null
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
+ * Author: James.Qian.Wang <james.qian.wang@arm.com>
+ *
+ */
+#include "komeda_dev.h"
+#include "komeda_kms.h"
+
+static int
+komeda_wb_init_data_flow(struct komeda_layer *wb_layer,
+ struct drm_connector_state *conn_st,
+ struct komeda_crtc_state *kcrtc_st,
+ struct komeda_data_flow_cfg *dflow)
+{
+ struct drm_framebuffer *fb = conn_st->writeback_job ?
+ conn_st->writeback_job->fb : NULL;
+
+ if (!fb)
+ return -EINVAL;
+
+ memset(dflow, 0, sizeof(*dflow));
+
+ dflow->out_w = fb->width;
+ dflow->out_h = fb->height;
+
+ /* the write back data comes from the compiz */
+ pipeline_composition_size(kcrtc_st, &dflow->in_w, &dflow->in_h);
+ dflow->input.component = &wb_layer->base.pipeline->compiz->base;
+ /* compiz doesn't output alpha */
+ dflow->pixel_blend_mode = DRM_MODE_BLEND_PIXEL_NONE;
+ dflow->rot = DRM_MODE_ROTATE_0;
+
+ return 0;
+}
+
+static int
+komeda_wb_encoder_atomic_check(struct drm_encoder *encoder,
+ struct drm_crtc_state *crtc_st,
+ struct drm_connector_state *conn_st)
+{
+ struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc_st);
+ struct komeda_layer *wb_layer;
+ struct komeda_data_flow_cfg dflow;
+ int err;
+
+ if (!crtc_st->active) {
+ DRM_DEBUG_ATOMIC("Cannot write the composition result out on a inactive CRTC.\n");
+ return -EINVAL;
+ }
+
+ wb_layer = to_kconn(to_wb_conn(conn_st->connector))->wb_layer;
+
+ /*
+ * No need for a full modested when the only connector changed is the
+ * writeback connector.
+ */
+ if (crtc_st->connectors_changed &&
+ is_only_changed_connector(crtc_st, conn_st->connector))
+ crtc_st->connectors_changed = false;
+
+ err = komeda_wb_init_data_flow(wb_layer, conn_st, kcrtc_st, &dflow);
+ if (err)
+ return err;
+
+ return komeda_build_wb_data_flow(wb_layer, conn_st, kcrtc_st, &dflow);
+}
+
+static const struct drm_encoder_helper_funcs komeda_wb_encoder_helper_funcs = {
+ .atomic_check = komeda_wb_encoder_atomic_check,
+};
+
+static int
+komeda_wb_connector_get_modes(struct drm_connector *connector)
+{
+ return 0;
+}
+
+static enum drm_mode_status
+komeda_wb_connector_mode_valid(struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ struct drm_device *dev = connector->dev;
+ struct drm_mode_config *mode_config = &dev->mode_config;
+ int w = mode->hdisplay, h = mode->vdisplay;
+
+ if ((w < mode_config->min_width) || (w > mode_config->max_width))
+ return MODE_BAD_HVALUE;
+
+ if ((h < mode_config->min_height) || (h > mode_config->max_height))
+ return MODE_BAD_VVALUE;
+
+ return MODE_OK;
+}
+
+static const struct drm_connector_helper_funcs komeda_wb_conn_helper_funcs = {
+ .get_modes = komeda_wb_connector_get_modes,
+ .mode_valid = komeda_wb_connector_mode_valid,
+};
+
+static enum drm_connector_status
+komeda_wb_connector_detect(struct drm_connector *connector, bool force)
+{
+ return connector_status_connected;
+}
+
+static int
+komeda_wb_connector_fill_modes(struct drm_connector *connector,
+ uint32_t maxX, uint32_t maxY)
+{
+ return 0;
+}
+
+static void komeda_wb_connector_destroy(struct drm_connector *connector)
+{
+ drm_connector_cleanup(connector);
+ kfree(to_kconn(to_wb_conn(connector)));
+}
+
+static const struct drm_connector_funcs komeda_wb_connector_funcs = {
+ .reset = drm_atomic_helper_connector_reset,
+ .detect = komeda_wb_connector_detect,
+ .fill_modes = komeda_wb_connector_fill_modes,
+ .destroy = komeda_wb_connector_destroy,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int komeda_wb_connector_add(struct komeda_kms_dev *kms,
+ struct komeda_crtc *kcrtc)
+{
+ struct komeda_dev *mdev = kms->base.dev_private;
+ struct komeda_wb_connector *kwb_conn;
+ struct drm_writeback_connector *wb_conn;
+ u32 *formats, n_formats = 0;
+ int err;
+
+ if (!kcrtc->master->wb_layer)
+ return 0;
+
+ kwb_conn = kzalloc(sizeof(*wb_conn), GFP_KERNEL);
+ if (!kwb_conn)
+ return -ENOMEM;
+
+ kwb_conn->wb_layer = kcrtc->master->wb_layer;
+
+ wb_conn = &kwb_conn->base;
+ wb_conn->encoder.possible_crtcs = BIT(drm_crtc_index(&kcrtc->base));
+
+ formats = komeda_get_layer_fourcc_list(&mdev->fmt_tbl,
+ kwb_conn->wb_layer->layer_type,
+ &n_formats);
+
+ err = drm_writeback_connector_init(&kms->base, wb_conn,
+ &komeda_wb_connector_funcs,
+ &komeda_wb_encoder_helper_funcs,
+ formats, n_formats);
+ komeda_put_fourcc_list(formats);
+ if (err)
+ return err;
+
+ drm_connector_helper_add(&wb_conn->base, &komeda_wb_conn_helper_funcs);
+
+ kcrtc->wb_conn = kwb_conn;
+
+ return 0;
+}
+
+int komeda_kms_add_wb_connectors(struct komeda_kms_dev *kms,
+ struct komeda_dev *mdev)
+{
+ int i, err;
+
+ for (i = 0; i < kms->n_crtcs; i++) {
+ err = komeda_wb_connector_add(kms, &kms->crtcs[i]);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
--
2.17.1