[PATCH v0 01/10] drm/bridge: dw-hdmi: add low-active PHY reset

[Lucas Stach]

Allow vendor PHY implementations to reset PHYs with different polarity
than the current Gen2 reset.

Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 7 +++++++
 include/drm/bridge/dw_hdmi.h              | 1 +
 2 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 4befc104d220..7600f26aab27 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -1365,6 +1365,13 @@ void dw_hdmi_phy_reset(struct dw_hdmi *hdmi)
 }
 EXPORT_SYMBOL_GPL(dw_hdmi_phy_reset);
 
+void dw_hdmi_phy_reset_active_low(struct dw_hdmi *hdmi)
+{
+	hdmi_writeb(hdmi, 0, HDMI_MC_PHYRSTZ);
+	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_PHYRSTZ, HDMI_MC_PHYRSTZ);
+}
+EXPORT_SYMBOL_GPL(dw_hdmi_phy_reset_active_low);
+
 void dw_hdmi_phy_i2c_set_addr(struct dw_hdmi *hdmi, u8 address)
 {
 	hdmi_phy_test_clear(hdmi, 1);
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index 2a1f85f9a8a3..9b3d52a1e62a 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -190,6 +190,7 @@ void dw_hdmi_phy_i2c_write(struct dw_hdmi *hdmi, unsigned short data,
 void dw_hdmi_phy_gen2_pddq(struct dw_hdmi *hdmi, u8 enable);
 void dw_hdmi_phy_gen2_txpwron(struct dw_hdmi *hdmi, u8 enable);
 void dw_hdmi_phy_reset(struct dw_hdmi *hdmi);
+void dw_hdmi_phy_reset_active_low(struct dw_hdmi *hdmi);
 
 enum drm_connector_status dw_hdmi_phy_read_hpd(struct dw_hdmi *hdmi,
 					       void *data);
-- 
2.30.2