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Subject[PATCH 5/7] drm/rockchip: dw-mipi: support HPD poll
Date
At the first time of bind, there is no any panel attach in mipi. Add a
DRM_CONNECTOR_POLL_HPD porperty to detect the panel status, when panel
probe, the dw_mipi_dsi_host_attach would be called, then mipi-dsi will
trigger a event to notify the drm framework.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
---

drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 41 ++++++++++++++++++++++++++++------
1 file changed, 34 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 15ba796..72d7f48 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -285,6 +285,7 @@ struct dw_mipi_dsi {
struct drm_encoder encoder;
struct drm_connector connector;
struct mipi_dsi_host dsi_host;
+ struct device_node *panel_node;
struct drm_panel *panel;
struct device *dev;
struct regmap *grf_regmap;
@@ -462,7 +463,6 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
dsi_write(dsi, DSI_PHY_RSTZ, PHY_ENFORCEPLL | PHY_ENABLECLK |
PHY_UNRSTZ | PHY_UNSHUTDOWNZ);

-
ret = readx_poll_timeout(readl, dsi->base + DSI_PHY_STATUS,
val, val & LOCK, 1000, PHY_STATUS_TIMEOUT_US);
if (ret < 0) {
@@ -550,11 +550,11 @@ static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
dsi->lanes = device->lanes;
dsi->channel = device->channel;
dsi->format = device->format;
- dsi->panel = of_drm_find_panel(device->dev.of_node);
- if (dsi->panel)
- return drm_panel_attach(dsi->panel, &dsi->connector);
+ dsi->panel_node = device->dev.of_node;
+ if (dsi->connector.dev)
+ drm_helper_hpd_irq_event(dsi->connector.dev);

- return -EINVAL;
+ return 0;
}

static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
@@ -562,7 +562,10 @@ static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
{
struct dw_mipi_dsi *dsi = host_to_dsi(host);

- drm_panel_detach(dsi->panel);
+ dsi->panel_node = NULL;
+
+ if (dsi->connector.dev)
+ drm_helper_hpd_irq_event(dsi->connector.dev);

return 0;
}
@@ -1022,13 +1025,33 @@ static struct drm_connector_helper_funcs dw_mipi_dsi_connector_helper_funcs = {
static enum drm_connector_status
dw_mipi_dsi_detect(struct drm_connector *connector, bool force)
{
- return connector_status_connected;
+ struct dw_mipi_dsi *dsi = con_to_dsi(connector);
+
+
+ if (!dsi->panel) {
+ dsi->panel = of_drm_find_panel(dsi->panel_node);
+ if (dsi->panel)
+ drm_panel_attach(dsi->panel, &dsi->connector);
+ } else if (!dsi->panel_node) {
+ struct drm_encoder *encoder;
+
+ encoder = platform_get_drvdata(to_platform_device(dsi->dev));
+ dw_mipi_dsi_encoder_disable(encoder);
+ drm_panel_detach(dsi->panel);
+ dsi->panel = NULL;
+ }
+
+ if (dsi->panel)
+ return connector_status_connected;
+
+ return connector_status_disconnected;
}

static void dw_mipi_dsi_drm_connector_destroy(struct drm_connector *connector)
{
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
+ connector->dev = NULL;
}

static struct drm_connector_funcs dw_mipi_dsi_atomic_connector_funcs = {
@@ -1069,6 +1092,8 @@ static int dw_mipi_dsi_register(struct drm_device *drm,
return ret;
}

+ connector->polled = DRM_CONNECTOR_POLL_HPD;
+
drm_connector_helper_add(connector,
&dw_mipi_dsi_connector_helper_funcs);

@@ -1225,6 +1250,8 @@ static void dw_mipi_dsi_unbind(struct device *dev, struct device *master,
{
struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);

+ dw_mipi_dsi_encoder_disable(&dsi->encoder);
+
mipi_dsi_host_unregister(&dsi->dsi_host);
pm_runtime_disable(dev);
clk_disable_unprepare(dsi->pllref_clk);
--
2.6.3
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