[PATCH 07/10] drm/bridge: synopsys: dw-dp: Add Runtime PM support
From: Sebastian Reichel <hidden>
Date: 2026-03-26 17:31:48
Also in:
dri-devel, linux-rockchip, lkml
Subsystem:
drm driver for synopsys designware displayport bridge, drm drivers, drm drivers and misc gpu patches, drm drivers for bridge chips, the rest · Maintainers:
Andy Yan, David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Andrzej Hajda, Neil Armstrong, Robert Foss, Linus Torvalds
Add runtime PM stubs to the Synopsys DesignWare DisplayPort bridge driver. Support is not enabled automatically and must be hooked up in the vendor specific glue code. Signed-off-by: Sebastian Reichel <redacted> --- drivers/gpu/drm/bridge/synopsys/dw-dp.c | 27 +++++++++++++++++++++++++++ include/drm/bridge/dw_dp.h | 3 +++ 2 files changed, 30 insertions(+)
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
index df2d629287fd..9ee9e3b9d912 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c@@ -1465,6 +1465,8 @@ static ssize_t dw_dp_aux_transfer(struct drm_dp_aux *aux, if (WARN_ON(msg->size > 16)) return -E2BIG; + ACQUIRE(pm_runtime_active_auto, pm)(dp->dev); + switch (msg->request & ~DP_AUX_I2C_MOT) { case DP_AUX_NATIVE_WRITE: case DP_AUX_I2C_WRITE:
@@ -1655,6 +1657,8 @@ static void dw_dp_bridge_atomic_enable(struct drm_bridge *bridge, struct drm_connector_state *conn_state; int ret; + pm_runtime_get_sync(dp->dev); + connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder); if (!connector) { dev_err(dp->dev, "failed to get connector\n");
@@ -1709,6 +1713,7 @@ static void dw_dp_bridge_atomic_disable(struct drm_bridge *bridge, dw_dp_link_disable(dp); bitmap_zero(dp->sdp_reg_bank, SDP_REG_BANK_SIZE); dw_dp_reset(dp); + pm_runtime_put_autosuspend(dp->dev); } static bool dw_dp_hpd_detect_link(struct dw_dp *dp, struct drm_connector *connector)
@@ -1729,6 +1734,8 @@ static enum drm_connector_status dw_dp_bridge_detect(struct drm_bridge *bridge, { struct dw_dp *dp = bridge_to_dp(bridge); + ACQUIRE(pm_runtime_active_auto, pm)(dp->dev); + if (!dw_dp_hpd_detect(dp)) return connector_status_disconnected;
@@ -2155,6 +2162,26 @@ struct dw_dp *dw_dp_bind(struct device *dev, struct drm_encoder *encoder, } EXPORT_SYMBOL_GPL(dw_dp_bind); +int dw_dp_runtime_suspend(struct dw_dp *dp) +{ + clk_disable_unprepare(dp->aux_clk); + clk_disable_unprepare(dp->apb_clk); + + return 0; +} +EXPORT_SYMBOL_GPL(dw_dp_runtime_suspend); + +int dw_dp_runtime_resume(struct dw_dp *dp) +{ + clk_prepare_enable(dp->apb_clk); + clk_prepare_enable(dp->aux_clk); + + dw_dp_init_hw(dp); + + return 0; +} +EXPORT_SYMBOL_GPL(dw_dp_runtime_resume); + MODULE_AUTHOR("Andy Yan <andyshrk@163.com>"); MODULE_DESCRIPTION("DW DP Core Library"); MODULE_LICENSE("GPL");
diff --git a/include/drm/bridge/dw_dp.h b/include/drm/bridge/dw_dp.h
index 4aacd0e56f50..8377f4be8e9e 100644
--- a/include/drm/bridge/dw_dp.h
+++ b/include/drm/bridge/dw_dp.h@@ -27,4 +27,7 @@ struct dw_dp_plat_data { struct dw_dp *dw_dp_bind(struct device *dev, struct drm_encoder *encoder, const struct dw_dp_plat_data *plat_data); + +int dw_dp_runtime_suspend(struct dw_dp *dp); +int dw_dp_runtime_resume(struct dw_dp *dp); #endif /* __DW_DP__ */
--
2.53.0