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drm/vc4: Switch DPI to using the panel-bridge helper. 

Another 100 lines of boilerplate gone, while allowing for bridges to
be connected in the display chain.

Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170511183128.25085-3-eric@anholt.net
This commit is contained in:
Eric Anholt 2017-05-11 11:31:24 -07:00 committed by Archit Taneja
parent 656fa22f9c
commit 7b1298e053
1 changed files with 30 additions and 134 deletions
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164
drivers/gpu/drm/vc4/vc4_dpi.c
View File

@ -23,8 +23,10 @@
*/
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <linux/clk.h>
#include <linux/component.h>
@ -95,7 +97,8 @@ struct vc4_dpi {
struct drm_encoder *encoder;
struct drm_connector *connector;
struct drm_panel *panel;
struct drm_bridge *bridge;
bool is_panel_bridge;
void __iomem *regs;
@ -118,24 +121,6 @@ to_vc4_dpi_encoder(struct drm_encoder *encoder)
return container_of(encoder, struct vc4_dpi_encoder, base.base);
}
/* VC4 DPI connector KMS struct */
struct vc4_dpi_connector {
struct drm_connector base;
struct vc4_dpi *dpi;
/* Since the connector is attached to just the one encoder,
* this is the reference to it so we can do the best_encoder()
* hook.
*/
struct drm_encoder *encoder;
};
static inline struct vc4_dpi_connector *
to_vc4_dpi_connector(struct drm_connector *connector)
{
return container_of(connector, struct vc4_dpi_connector, base);
}
#define DPI_REG(reg) { reg, #reg }
static const struct {
u32 reg;
@ -167,80 +152,6 @@ int vc4_dpi_debugfs_regs(struct seq_file *m, void *unused)
}
#endif
static enum drm_connector_status
vc4_dpi_connector_detect(struct drm_connector *connector, bool force)
{
struct vc4_dpi_connector *vc4_connector =
to_vc4_dpi_connector(connector);
struct vc4_dpi *dpi = vc4_connector->dpi;
if (dpi->panel)
return connector_status_connected;
else
return connector_status_disconnected;
}
static void vc4_dpi_connector_destroy(struct drm_connector *connector)
{
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
}
static int vc4_dpi_connector_get_modes(struct drm_connector *connector)
{
struct vc4_dpi_connector *vc4_connector =
to_vc4_dpi_connector(connector);
struct vc4_dpi *dpi = vc4_connector->dpi;
if (dpi->panel)
return drm_panel_get_modes(dpi->panel);
return 0;
}
static const struct drm_connector_funcs vc4_dpi_connector_funcs = {
.dpms = drm_atomic_helper_connector_dpms,
.detect = vc4_dpi_connector_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = vc4_dpi_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 const struct drm_connector_helper_funcs vc4_dpi_connector_helper_funcs = {
.get_modes = vc4_dpi_connector_get_modes,
};
static struct drm_connector *vc4_dpi_connector_init(struct drm_device *dev,
struct vc4_dpi *dpi)
{
struct drm_connector *connector = NULL;
struct vc4_dpi_connector *dpi_connector;
dpi_connector = devm_kzalloc(dev->dev, sizeof(*dpi_connector),
GFP_KERNEL);
if (!dpi_connector)
return ERR_PTR(-ENOMEM);
connector = &dpi_connector->base;
dpi_connector->encoder = dpi->encoder;
dpi_connector->dpi = dpi;
drm_connector_init(dev, connector, &vc4_dpi_connector_funcs,
DRM_MODE_CONNECTOR_DPI);
drm_connector_helper_add(connector, &vc4_dpi_connector_helper_funcs);
connector->polled = 0;
connector->interlace_allowed = 0;
connector->doublescan_allowed = 0;
drm_mode_connector_attach_encoder(connector, dpi->encoder);
return connector;
}
static const struct drm_encoder_funcs vc4_dpi_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
@ -250,11 +161,7 @@ static void vc4_dpi_encoder_disable(struct drm_encoder *encoder)
struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
struct vc4_dpi *dpi = vc4_encoder->dpi;
drm_panel_disable(dpi->panel);
clk_disable_unprepare(dpi->pixel_clock);
drm_panel_unprepare(dpi->panel);
}
static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
@ -265,12 +172,6 @@ static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
u32 dpi_c = DPI_ENABLE | DPI_OUTPUT_ENABLE_MODE;
int ret;
ret = drm_panel_prepare(dpi->panel);
if (ret) {
DRM_ERROR("Panel failed to prepare\n");
return;
}
if (dpi->connector->display_info.num_bus_formats) {
u32 bus_format = dpi->connector->display_info.bus_formats[0];
@ -321,13 +222,6 @@ static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
ret = clk_prepare_enable(dpi->pixel_clock);
if (ret)
DRM_ERROR("Failed to set clock rate: %d\n", ret);
ret = drm_panel_enable(dpi->panel);
if (ret) {
DRM_ERROR("Panel failed to enable\n");
drm_panel_unprepare(dpi->panel);
return;
}
}
static bool vc4_dpi_encoder_mode_fixup(struct drm_encoder *encoder,
@ -351,24 +245,34 @@ static const struct of_device_id vc4_dpi_dt_match[] = {
{}
};
/* Walks the OF graph to find the panel node and then asks DRM to look
* up the panel.
/* Sets up the next link in the display chain, whether it's a panel or
* a bridge.
*/
static struct drm_panel *vc4_dpi_get_panel(struct device *dev)
static int vc4_dpi_init_bridge(struct vc4_dpi *dpi)
{
struct device_node *panel_node;
struct device_node *np = dev->of_node;
struct device *dev = &dpi->pdev->dev;
struct drm_panel *panel;
int ret;
/* don't proceed if we have an endpoint but no panel_node tied to it */
panel_node = of_graph_get_remote_node(np, 0, 0);
if (!panel_node)
return NULL;
ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
&panel, &dpi->bridge);
if (ret) {
/* If nothing was connected in the DT, that's not an
* error.
*/
if (ret == -ENODEV)
return 0;
else
return ret;
}
panel = of_drm_find_panel(panel_node);
of_node_put(panel_node);
if (panel) {
dpi->bridge = drm_panel_bridge_add(panel,
DRM_MODE_CONNECTOR_DPI);
dpi->is_panel_bridge = true;
}
return panel;
return drm_bridge_attach(dpi->encoder, dpi->bridge, NULL);
}
static int vc4_dpi_bind(struct device *dev, struct device *master, void *data)
@ -422,20 +326,13 @@ static int vc4_dpi_bind(struct device *dev, struct device *master, void *data)
if (ret)
DRM_ERROR("Failed to turn on core clock: %d\n", ret);
dpi->panel = vc4_dpi_get_panel(dev);
drm_encoder_init(drm, dpi->encoder, &vc4_dpi_encoder_funcs,
DRM_MODE_ENCODER_DPI, NULL);
drm_encoder_helper_add(dpi->encoder, &vc4_dpi_encoder_helper_funcs);
dpi->connector = vc4_dpi_connector_init(drm, dpi);
if (IS_ERR(dpi->connector)) {
ret = PTR_ERR(dpi->connector);
ret = vc4_dpi_init_bridge(dpi);
if (ret)
goto err_destroy_encoder;
}
if (dpi->panel)
drm_panel_attach(dpi->panel, dpi->connector);
dev_set_drvdata(dev, dpi);
@ -456,10 +353,9 @@ static void vc4_dpi_unbind(struct device *dev, struct device *master,
struct vc4_dev *vc4 = to_vc4_dev(drm);
struct vc4_dpi *dpi = dev_get_drvdata(dev);
if (dpi->panel)
drm_panel_detach(dpi->panel);
if (dpi->is_panel_bridge)
drm_panel_bridge_remove(dpi->bridge);
vc4_dpi_connector_destroy(dpi->connector);
drm_encoder_cleanup(dpi->encoder);
clk_disable_unprepare(dpi->core_clock);